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DQD20-24-D5H-DIN
DC-DC, ISOLATED, 20 W
⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.
- Manufacturer: CUI
- Product type: Isolated DIN Rail Mount DC / DC Converters
- SVHC: To Be Advised
| Delivery and price | |
|---|---|
| Units per pack | 36 |
| Price | 27.1 € |
| Current stock | 10+ |
| Lead time | 30 days |
Datasheet
**date** 10/07/2025 **page** 1 of 14 ## **SERIES:** DQD20 **│ DESCRIPTION:** DC-DC CONVERTER ## **FEATURES** - up to 20 W isolated output - single and dual regulated outputs - over voltage, input under voltage, short circuit, and over current protections - remote on/off control - 1,500 Vdc isolation - -40 ~ 85°C temperature range, with derating - certified to IEC/EN 62368-1 - PCB, chassis and DIN-rail mount options |nut<br>UK<br>Hows C € CA|||||||| |---|---|---|---|---|---|---|---| |**MODEL**|**input**<br>**voltage**||**output**<br>**voltage**|**output**<br>**current**|**output**<br>**power**|**ripple**<br>**& noise1**|**efficiency2**| ||**typ**|**range**|**typ**|**max**|**max**|**max**|**typ**| ||(Vdc)|(Vdc)|(Vdc)|(mA)|(W)|(mVp-p)|(%)| |DQD20-24-S3|24|9~36|3.3|5,000|16.5|100|88| |DQD20-24-S5|24|9~36|5|4,000|20|100|90| |DQD20-24-S9|24|9~36|9|2,222|20|100|90| |DQD20-24-S12|24|9~36|12|1,667|20|100|90| |DQD20-24-S15|24|9~36|15|1,333|20|100|90| |DQD20-24-S24|24|9~36|24|1,111|20|100|89| |DQD20-24-S28|24|9~36|28|714|20|100|91| |DQD20-24-D5|24|9~36|±5|±2,000|20|200|87| |DQD20-24-D9|24|9~36|±9|±1,111|20|200|87| |DQD20-24-D12|24|9~36|±12|±833|20|200|90| |DQD20-24-D15|24|9~36|±15|±667|20|200|90| |DQD20-24-D24|24|9~36|±24|±416|20|200|88| |DQD20-48-S3|48|18~75|3.3|5,000|16.5|100|88| |DQD20-48-S5|48|18~75|5|4,000|20|100|90| |DQD20-48-S9|48|18~75|9|2,222|20|100|90| |DQD20-48-S12|48|18~75|12|1,667|20|100|91| |DQD20-48-S15|48|18~75|15|1,333|20|100|91| |DQD20-48-S24|48|18~75|24|833|20|100|91| |DQD20-48-D5|48|18~75|±5|±2,000|20|200|86| |DQD20-48-D9|48|18~75|±9|±1,111|20|200|87| |DQD20-48-D12|48|18~75|±12|±833|20|200|89| |DQD20-48-D15|48|18~75|±15|±667|20|200|89| |DQD20-48-D24|48|18~75|±24|±416|20|200|90| Notes: 1. The ripple and noise is measured at 10%~100% load and 20MHz bandwidth. 0% ~10% load ripple & noise is less than or equal to 5%Vo; the ripple & noise test adopts the parallel line test method, see the ripple & noise test instructions for details. 2. The efficiency is tested at full load. 3. Unless otherwise specified, all values or indicators in this manual are tested at Ta=25°C, humidity<75%RH, rated input voltage and rated load (pure resistance load). **cui** .com **CUI Inc │ SERIES:** DQD20 **│ DESCRIPTION:** DC-DC CONVERTER **date** 10/07/2025 **│ page** 2 of 14 ## **PART NUMBER KEY** ## **- - - DQD20 XX X XX X X** Base Number Mounting Style: “blank” = board mount Input Voltage T = chassis mount Output: Output Voltage Heatsink DIN = DIN-rail mount S = single “blank” = no heatsink D = dual H = with heatsink ## **INPUT** |**INPUT**|| |---|---| |**parameter**|**conditions/description**<br>**min**<br>**typ**<br>**max**<br>**units**| |input voltage range|24 Vdc input models<br>48 Vdc input models<br>9<br>18<br>24<br>48<br>36<br>75<br>Vdc<br>Vdc| |input current (full load/no load)|24 Vdc input; 3.3 Vdc output model<br>24 Vdc input; 5, 9 Vdc output model<br>24 Vdc input; 12, 15 Vdc output models<br>24 Vdc input; 24, 28 Vdc output models<br>48 Vdc input; 3.3 Vdc output models<br>48 Vdc input; 5, 9 Vdc output models<br>48 Vdc input; 12, 15, 24 Vdc output models<br>24 Vdc input; ±5 Vdc output model<br>24 Vdc input; ±9 Vdc output model<br>24 Vdc input; ±12, ±15 Vdc output model<br>24 Vdc input; ±24 Vdc output model<br>48 Vdc input; ±5 Vdc output model<br>48 Vdc input; ±9 Vdc output model<br>48 Vdc input; ±12, ±15 Vdc output model<br>48 Vdc input; ±24 Vdc output model<br>781/33<br>926/33<br>926/5<br>915/5<br>390/17<br>463/17<br>457/5<br>957/33<br>946/6<br>926/5<br>947/5<br>484/17<br>472/5<br>468/5<br>463/5<br>mA<br>mA<br>mA<br>mA<br>mA<br>mA<br>mA<br>mA<br>mA<br>mA<br>mA<br>mA<br>mA<br>mA<br>mA| |surge voltage|1 second max<br>24 Vdc input models<br>48 Vdc input models<br>-0.7<br>-0.7<br>50<br>100<br>Vdc<br>Vdc| |turn-of voltage threshold|at full load<br>24 Vdc input models<br>48 Vdc input models<br>5<br>11<br>7<br>13<br>9<br>18<br>Vdc<br>Vdc| |flter|Pi flter| |no load power consumption|0.1<br>W| |remote on/of4|module on<br>single outputs<br>dual outputs<br>CTRL pin suspended or pulled high (2.5~12 Vdc)<br>CTRL pin suspended or pulled high (3.3~12 Vdc)| ||module of<br>CTRL pin connected to -Vin or pulled low (0~1.2 Vdc)| |input current when of|3<br>mA| Notes: 4. The voltage of CTRL pin is relative to -Vin pin. ## **OUTPUT** |**OUTPUT**|||||| |---|---|---|---|---|---| |**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**| ||3.3 Vdc output models|||10,000|μF| ||5, ±5 Vdc output models|||5,000|μF| ||9 Vdc output models|||3,000|μF| |maximum capacitive load|±9 Vdc output models<br>12, ±12 Vdc output models|||2,000<br>1,000|μF<br>μF| ||15, ±15 Vdc output models|||800|μF| ||18 Vdc output models|||600|μF| ||24, ±24, 28 Vdc output models|||500|μF| **cui** .com **CUI Inc │ SERIES:** DQD20 **│ DESCRIPTION:** DC-DC CONVERTER **date** 10/07/2025 **│ page** 3 of 14 |**OUTPUT**|| |---|---| |**parameter**|**conditions/description**<br>**min**<br>**typ**<br>**max**<br>**units**| |voltage accuracy|single outputs<br>±1<br>±2<br>%| ||dual outputs<br>Vo1<br>Vo2<br>±1<br>±.5<br>±2<br>±3<br>%<br>%| |voltage regulation|full voltage range, nominal load<br>±0.2<br>±0.5<br>%| |load regulation|5% ~ 100% load<br>±0.5<br>±1<br>%| |transient response recovery|25% rated load step change<br>single outputs<br>dual outputs<br>250<br>300<br>500<br>500<br>µs<br>µs| |transient response deviation|25% rated load step change<br>3.3, 5, ±5 Vdc output models<br>all other models<br>±5<br>±3<br>±8<br>±5<br>%<br>%| |start-up time|at rated input voltage and constant resistance load<br>10<br>ms| |switching frequency|PWM mode<br>280<br>kHz| |adjustability|single outputs<br>via trim<br>90<br>110<br>%| ||dual outputs<br>unavailable| |**PROTECTIONS**|| |**parameter**|**conditions/description**<br>**min**<br>**typ**<br>**max**<br>**units**| |over current protection|110<br>220<br>%| |over voltage protection|single outputs<br>dual outputs<br>110<br>120<br>200<br>200<br>%<br>%| |short circuit protection|continuous, auto recovery, hiccup| |output overshoot|10<br>%| |**SAFETY AND COMPLIANCE**|| |**parameter**<br>**conditions/description**<br>**min**<br>**typ**<br>**max**<br>**units**|| |isolation voltage<br>input to output for 1 minute, 0.5 mA max<br>input/output to case for 1 minute, 0.5 mA max<br>1,500<br>1,000<br>Vdc<br>Vdc|| |isolation capacitance<br>input to output, (100 kHz, 0.1V)<br>1,000<br>pF|| |safety approvals5<br>certifed to 62368-1: IEC, EN|| |conducted emissions<br>CISPR32/EN55032 Class B (see recommended circuit)|| |radiated emissions<br>CISPR32/EN55032 Class B (see recommended circuit)|| |ESD<br>IEC/EN61000-4-2 Contact ±6 kV, Air ±8 kV, Perf. Criteria B|| |radiated immunity<br>IEC/EN61000-4-3 10 V/m, Perf. Criteria A (see recommended circuit)|| |conducted immunity<br>IEC/EN61000-4-6 3 Vrms, Perf. Criteria A (see recommended circuit)|| |MTBF<br>as per MIL-HDBK-217F at 25 °C<br>1,000,000<br>hours|| |RoHS<br>yes|| |Notes:<br>5. Output is only considered as ES1 if the input source meets reinforced insulation requirements from primary AC source or any hazardous voltage source.<br>Unit maintains only functional insulation from input to output|| ## **ENVIRONMENTAL** |**ENVIRONMENTAL**|||||| |---|---|---|---|---|---| |**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**| |operating temperature|see derating curve|-40||85|°C| |max case temperature||||105|°C| |storage temperature||-55||125|°C| |operating humidity|non condensing|5||95|%| **cui** .com **CUI Inc │ SERIES:** DQD20 **│ DESCRIPTION:** DC-DC CONVERTER **date** 10/07/2025 **│ page** 4 of 14 ## **MECHANICAL** |**MECHANICAL**|||||| |---|---|---|---|---|---| |**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**| ||board mount: 25.4 x 25.4 x 12.5 [1.000 x 1.000 x 0.492 inches]|board mount: 25.4 x 25.4 x 12.5 [1.000 x 1.000 x 0.492 inches]|||mm| ||board mount with heatsink: 25.4 x 25.4 x 18.0 [1.000 x 1.000 x 0.708 inches]||||mm| |dimensions|chassis mount: 76.0 x 31.5 x 21.3 [2.990 x 1.240 x 0.838 inches]<br>chassis mount with heatsink 76.0 x 31.5 x 26.0 [2.990 x 1.240 x 1.023 inches]||||mm<br>mm| ||DIN-rail mount: 76.0 x 31.5 x 26.0 [2.990 x 1.240 x 1.023 inches]||||mm| ||DIN-rail mount with heatsink: 76.0 x 31.5 x 30.8 [2.990 x 1.240 x 1.212 inches]||DIN-rail mount with heatsink: 76.0 x 31.5 x 30.8 [2.990 x 1.240 x 1.212 inches]||mm| |case material|aluminum||||| |||board mount|15||g| |||board mount with heatsink|19||g| ||single output models|chassis mount<br>chassis mount with heatsink|37<br>40||g<br>g| |||DIN-rail mount|57||g| |weight||DIN-rail mount with heatsink<br>board mount|60<br>18||g<br>g| |||board mount with heatsink|21||g| ||dual output models|chassis mount<br>chassis mount with heatsink|39<br>42||g<br>g| |||DIN-rail mount|59||g| |||DIN-rail mount with heatsink|62||g| |cooling|natural convection||||| ## **MECHANICAL DRAWING** ## **Board Mount** units: mm [inch] pin diameter tolerance: ±0.10 [±0.004] general tolerance: ±0.50 [±0.020] ||<br>(0.300)<br>Lg<br>Lt||<br>(0.300)<br>Lg<br>Lt||<br>(0.300)<br>Lg<br>Lt| |---|---|---| |PIN CONNECTIONS||| |PIN|Single|Dual| |1|-Vin|-Vin| |2|+Vin|+Vin| |3|+Vout|+Vout| |4|Trim|COM| |5|GND|-Vout| |6|Ctrl|Ctrl| **cui** .com **CUI Inc │ SERIES:** DQD20 **│ DESCRIPTION:** DC-DC CONVERTER **date** 10/07/2025 **│ page** 5 of 14 ## **MECHANICAL DRAWING (CONTINUED)** ## **Board Mount with Heatsink** units: mm [inch] pin diameter tolerance: ±0.10 [±0.004] general tolerance: ±0.50 [±0.020] |PIN CONNECTIONS|PIN CONNECTIONS|PIN CONNECTIONS| |---|---|---| |PIN|Single|Dual| |1|-Vin|-Vin| |2|+Vin|+Vin| |3|+Vout|+Vout| |4|Trim|COM| |5|GND|-Vout| |6|Ctrl|Ctrl| ## **Chassis Mount** units: mm [inch] pin diameter tolerance: ±0.10 [±0.004] general tolerance: ±0.50 [±0.02] wire range: 24~12 AWG tightening torque: max 0.4 N·m |PIN CONNECTIONS|PIN CONNECTIONS|PIN CONNECTIONS| |---|---|---| |PIN|Single|Dual| |1|-Vin|-Vin| |2|+Vin|+Vin| |3|+Vout|+Vout| |4|Trim|COM| |5|GND|-Vout| |6|Ctrl|Ctrl| **cui** .com **CUI Inc │ SERIES:** DQD20 **│ DESCRIPTION:** DC-DC CONVERTER **date** 10/07/2025 **│ page** 6 of 14 ## **MECHANICAL DRAWING (CONTINUED)** ## **Chassis Mount with Heatsink** units: mm [inch] pin diameter tolerance: ±0.10 [±0.004] general tolerance: ±0.50 [±0.02] wire range: 24~12 AWG tightening torque: max 0.4 N·m |PIN CONNECTIONS|PIN CONNECTIONS|PIN CONNECTIONS| |---|---|---| |PIN|Single|Dual| |1|-Vin|-Vin| |2|+Vin|+Vin| |3|+Vout|+Vout| |4|Trim|COM| |5|GND|-Vout| |6|Ctrl|Ctrl| ## **DIN-rail Mount** units: mm [inch] pin diameter tolerance: ±0.10 [±0.004] general tolerance: ±0.50 [±0.02] wire range: 24~12 AWG tightening torque: max 0.4 N·m |PIN CONNECTIONS|PIN CONNECTIONS|PIN CONNECTIONS| |---|---|---| |PIN|Single|Dual| |1|-Vin|-Vin| |2|+Vin|+Vin| |3|+Vout|+Vout| |4|Trim|COM| |5|GND|-Vout| |6|Ctrl|Ctrl| **cui** .com **CUI Inc │ SERIES:** DQD20 **│ DESCRIPTION:** DC-DC CONVERTER **date** 10/07/2025 **│ page** 7 of 14 ## **MECHANICAL DRAWING (CONTINUED)** ## **DIN-rail Mount with Heatsink** units: mm [inch] pin diameter tolerance: ±0.10 [±0.004] general tolerance: ±0.50 [±0.02] wire range: 24~12 AWG tightening torque: max 0.4 N·m |PIN CONNECTIONS|PIN CONNECTIONS|PIN CONNECTIONS| |---|---|---| |PIN|Single|Dual| |1|-Vin|-Vin| |2|+Vin|+Vin| |3|+Vout|+Vout| |4|Trim|COM| |5|GND|-Vout| |6|Ctrl|Ctrl| **cui** .com **CUI Inc │ SERIES:** DQD20 **│ DESCRIPTION:** DC-DC CONVERTER **date** 10/07/2025 **│ page** 8 of 14 ## **DERATING CURVES** **cui** .com **CUI Inc │ SERIES:** DQD20 **│ DESCRIPTION:** DC-DC CONVERTER **date** 10/07/2025 **│ page** 9 of 14 ## **EFFICIENCY CURVES** **cui** .com **CUI Inc │ SERIES:** DQD20 **│ DESCRIPTION:** DC-DC CONVERTER **date** 10/07/2025 **│ page** 10 of 14 ## **RIPPLE AND NOISE TEST INSTRUCTION** **1.** The ripple noise test requires the following setup: - 12 twisted pair cables. - An oscilloscope configured to Sample Mode with a bandwidth of 20 MHz. - A 100 MHz bandwidth probe with the capacitor and ground removed. - Capacitors C2 (0.1 µF), a polypropylene capacitor, and C3 (10 µF), a high-frequency, low-resistance electrolytic capacitor, connected in parallel to the probes and one side of the twisted pair. - C0 and C1 refer to the application circuit as per the recommended specifications. **2.** The ripple noise procedure: Connect the module input terminal (INPUT) to the input power supply. - Attach the power output terminal to the electronic load (LOAD) using the power line. Sample the output from the power output port using a 30 ± 2 cm twisted pair cable. Ensure the cable is connected exclusively to the oscilloscope probe, maintaining proper polarity alignment. **3.** It is recommended to operate with a minimum 5% load or to connect an electrolytic capacitor with a high-frequency resistance of at least 470 μF. Failure to do so may result in an increased output voltage ripple. **4.** For dual-channel output products, it is advised to maintain a load imbalance within ±5%. ## **Figure 1** ## **RIPPLE AND NOISE TEST CIRCUIT** ## **Figure 2** ## **Table 1** |COMPONENT|PARAMETER| |---|---| |C|220 µF/ 100 V| |L|4.7 µH / 15 A| **cui** .com **CUI Inc │ SERIES:** DQD20 **│ DESCRIPTION:** DC-DC CONVERTER **date** 10/07/2025 **│ page** 11 of 14 ## **APPLICATION NOTES** ## **Figure 3 Single output** ## **Table 2** |COMPONENT|PARAMETER| |---|---| |C0|100 µF / 100 V| |C1|22 µF / 100 V| ## **Figure 4 Dual output** ## **Table 3** |COMPONENT|PARAMETER| |---|---| |C0|47-100 µF/ 100 V| |C1|100 µF/ 100 V| ## **EMC RECOMMENDED CIRCUIT** ## **Figure 5 Single output** **Table 4** ||**Table 4**|| |---|---|---| |COMPONENT|24 Vdc|48 Vdc| |Fuse|TBD by customer|| |MOV1|14D560K|14D101K| |LCM1|5 mH|| |C1, C2, C3|330 µF/50 V|330 µF/100 V| |C4|47 µF/50 V|47 µF/50 V| |CY1, CY2|2.2 nF/2 kV|| **cui** .com **CUI Inc │ SERIES:** DQD20 **│ DESCRIPTION:** DC-DC CONVERTER **date** 10/07/2025 **│ page** 12 of 14 ## **EMC RECOMMENDED CIRCUIT (CONTINUED)** ## **Figure 6 Dual output** ## **Table 5** ||**Table 5**|| |---|---|---| |COMPONENT|24 Vdc|48 Vdc| |Fuse|TBD by customer|| |MOV1|14D560K|14D101K| |LCM1|5 mH|| |C1, C2, C3|330 µF/50 V|330 µF/100 V| |C4|47 µF/50 V|47 µF/50 V| |CY1, CY2|2.2 nF/2 kV|| **cui** .com **CUI Inc │ SERIES:** DQD20 **│ DESCRIPTION:** DC-DC CONVERTER **date** 10/07/2025 **│ page** 13 of 14 ## **TRIM RESISTOR AND CALCULATION (SINGLE OUTPUT MODELS ONLY)** **==> picture [38 x 9] intentionally omitted <==** **----- Start of picture text -----**<br> Figure 7<br>**----- End of picture text -----**<br> **Table 6** **==> picture [278 x 142] intentionally omitted <==** **----- Start of picture text -----**<br> |||||| |---|---|---|---|---| |V|R|R|R|V| |NOM|TOP|BOTTOM|O|REF| |(Vdc)|(kΩ)|(kΩ)|(kΩ)|(V)| |3.3|4.22|2.55|18|1.25| |5|5.10|5.10|20|2.50| |9|9.31|3.58|24|2.50| |12|18.0|4.75|33|2.50| |15|18.0|3.60|30|2.50| |24|30.0|3.48|30|2.50| |28|20.0|2.94|30|2.50| **----- End of picture text -----**<br> Note: Value for RTOP, RBOTTOM, RO, and VREF refer to Table 6 (fixed internal values). - RTRIM: Trim resistance - a: User-defined parameter, no actual meanings - VNOM: Nominal output voltage - VOUT: Target output voltage **cui** .com **CUI Inc │ SERIES:** DQD20 **│ DESCRIPTION:** DC-DC CONVERTER **date** 10/07/2025 **│ page** 14 of 14 ## **REVISION HISTORY** |**rev.**|**description**|**date**| |---|---|---| |1.0|initial release|05/29/2025| The revision history provided is for informational purposes only and is believed to be accurate. **==> picture [119 x 38] intentionally omitted <==** 15575 SW Sequoia Pkwy #100 Portland, OR 97224 800.275.4899 Fax 503.612.2383 belfuse.com powersupport@belf.com CUI offers a two (2) year limited warranty. Complete warranty information is listed on our website. CUI reserves the right to make changes to the product at any time without notice. Information provided by CUI is believed to be accurate and reliable. However, no responsibility is assumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use. CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
Updated at April 29, 2026
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