KAS4-8

AC/DC PCB Mount Power Supply (PSU), ITE, 1 Output, 4 W, 8 VDC, 500 mA

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Manufacturer: TDK-LAMBDA
Product type: AC / DC PCB Mount Power Supplies
No. of Outputs:1 Output; Output Power Max:4W; Output Voltage - Output 1:8V; Output Current - Output 1:500mA; Output Voltage - Output 2:-; Output Current - Output 2:-; Output Voltage - Outpu
SVHC: No SVHC (15-Jan-2018)
Depth: 37mm
Width: 27.5mm
Height: 17.5mm
Product Range: KAS Series
No. of Outputs: 1 Output
Output Power Max: 4W
Input Voltage VAC: 90V AC to 305V AC
Input Voltage AC Max: 305V
Input Voltage AC Min: 90V
Power Supply Output Type: Fixed
Output Current - Output 1: 500mA
Output Current - Output 2: -
Output Current - Output 3: -
Output Voltage - Output 1: 8VDC
Output Voltage - Output 2: -
Output Voltage - Output 3: -
Power Supply Applications: ITE

Delivery and price
Units per pack	100
Price	16.93 €
Current stock	10+
Lead time	30 days

Datasheet

KAS Series 

4W Wide Input AC-DC PCB-Mount Power Supplies 

https://product.tdk.com/en/power/kas www.emea.tdk-lambda.com/kas 

The encapsulated KAS board mount power supplies are certified to IEC/CSA/UL/EN 62368-1, designed to meet IEC/EN 60335-1 and meet EN 55032 Class B for conducted and radiated emissions. With a wide input range of 90-305Vac requiring no earth ground (Class II), the KAS series is ideally suited for a wide range of applications including security systems, building automation, professional household appliances, portable equipment and products requiring a separate standby voltage. 

|**Features**|**Features**||||**Benefits**||||
|---|---|---|---|---|---|---|---|---|
|• 90 - 305Vac Input|||||• Operates From 115V, 230V and 277Vac Nominal Inputs||||
|• Wide Temperature Range (-40 to +70°C)|||||• Suitable For Industrial Applications||||
|• Low No Load Power Consumption|||||• Energy Saving During System Standby||||
|• Class II Double Insulated Input|||||• No Ground Connection Needed||||
||||||||||
|**Model Selector**|||||||||
|Model|Output Voltage Maximum Current Maximum Power Ripple & Noise Line Regulation Load Regulation Efficiency||Output Voltage Maximum Current Maximum Power Ripple & Noise Line Regulation Load Regulation Efficiency||Output Voltage Maximum Current Maximum Power Ripple & Noise Line Regulation Load Regulation Efficiency||Output Voltage Maximum Current Maximum Power Ripple & Noise Line Regulation Load Regulation Efficiency|Maximum Load|
||(V)|(A)|(W)|(mVpk-pk)|(mV)|(mV)|(%)|Capacitance (uF)|
|KAS4-3P3|3.3|1.2|4|250|±16.5|±49.5|68|5,000|
|KAS4-5|5|0.8|4|250|±25|±75|72|4,200|
|KAS4-8|8|0.5|4|200|±40|±120|74|1,470|
|KAS4-9|9|0.444|4|200|±45|±135|75|1,330|
|KAS4-12|12|0.333|4|150|±24|±60|76|680|
|KAS4-14|14|0.286|4|150|±28|±70|76|470|
|KAS4-15|15|0.267|4|100|±30|±75|76|330|
|KAS4-24|24|0.167|4|100|±48|±120|77|120|



KAS Series 

1 

**==> picture [517 x 34] intentionally omitted <==**

## **Specifications** 

|**Specifcations**|**Specifcations**|**Specifcations**|
|---|---|---|
|Model<br>KAS4|||
|**Input**|||
|AC Input Voltage Range|Vac|90 - 305|
|Input Frequency|Hz|47 - 440*|
|DC Input Voltage Range|Vdc|120 - 430*|
|Input Current (115 / 230Vac)|mA|110 / 70|
|Inrush Current (115 / 230Vac)|A|15 / 25 (Cold start, 25°C, requires 10Ω 5A external NTC thermistor)|
|Touch Current (< 240Vac)|mA|<0.25|
|No Load Power Consumption|W|<0.3|
|Hold Up Time (typ) (115 / 230Vac)<br>|ms|>15|
|Effciency (1)|-|See model selector table|
|Conducted & Radiated EMI|-|EN55032-B|
|Immunity<br>|-|EN55024 (With external varistor L-N rated at 350Vrms maximum, 920V clamp, 0.6W minimum)|
|Safety Certifcations and Markings|-|UL/CSA/IEC/EN62368-1, IEC/EN60335-1 (Designed to meet), CE Mark and UKCA Mark|



## **Immunity** 

|**Immunity**|**Immunity**|**Immunity**|**Immunity**|**Immunity**|
|---|---|---|---|---|
||||||
|Test|Standard|Test Level|Criteria|Notes|
|ESD|IEC61000-4-2|2|A|Contact Discharge: ±4kV, Air Discharge: ±8kV|
|Radiated Susceptibility|IEC61000-4-3|2|A|Test Level: 3V/m at 80-1,000MHz|
|Electrical Fast Transient Burst|IEC61000-4-4|2|A|Voltage Peak: 1kV at 5kHz|
|Surge|IEC61000-4-5|2|A|Test Level: 1kV, Max Peak Current: 500A|
|Conducted Susceptibility|IEC61000-4-6|2|A|Test Level: 3Vrms|
|Magnetic Fields|IEC61000-4-8|1|A|Test Level: 1A/m|
|Voltage Dips and<br>Short Interruptions|IEC61000-4-11|<5% for 1/2 cycle<br>70% for 25/30 cycles<br><5% for 250/300 cycles|A<br>A<br>C|-<br>-<br>-|



## **Specifications** 

|**Specifcations**|**Specifcations**|**Specifcations**|
|---|---|---|
|Model<br>KAS4|||
|**Output**|||
|Output Voltage Set Accuracy|%|±2|
|Output Voltage Adjustment|-|None|
|Ripple and Noise|-|See model selector table|
|Switching Frequency<br>|kHz|124 to 140|
|Temperature Coeffcient|%/°C|±0.02|
|Minimum Load|-|None|
|Overcurrent Protection|%|>115 (Hiccup mode with auto-recovery)|
|Overvoltage Protection|-|None|
|Short Circuit Protection|-|None|
|Parallel Operation|-|Not possible|



KAS Series 

2 

## **Specifications** 

|Model||KAS4|
|---|---|---|
|**Environmental**|||
|Operating Temperature (2)|°C|-40 to +70, see derating curves below|
|Maximum Case Temperature|°C|90 (83 for <115Vac)|
|Storage Temperature|°C|-40 to +85|
|Humidity (non condensing)|%RH|10 to 95|
|Cooling|-|Convection|
|Altitude|m|3,000|
|Construction Class|-|II|
|Withstand Voltage (For 1 minute)|Vac|Input to Output 3,000|
|**Other**|||
|Weight (Typ)|g|26|
|Size (LxWxH)|mm|37.0 x 27.5 x 17.5|
|Size (LxWxH)|Inches|1.46 x 1.08 x 0.69|
|Case Material|-|Plastic Resin Case (UL 94V-0)|
|MTBF (MIL-HDBK-217F, 25°C)|Hours|450,000|
|Warranty|Years|3|



Notes: 

See website for detailed specifications, test methods and installation manual 

(1) Measured at 25%, 50%, 75% and 100% load conditions 

(2) Model dependent, see installation manual for details * Safety certified for AC input and 47-63Hz only 

## **KAS4 Outline Drawing** 

## **Pinout** 

|Pin|Function|
|---|---|
|1<br>2|+Vout<br>-Vout|
|3|Not connected|
|4|AC (L)|
|5<br>6|AC (N)<br>Not connected|



## **Derating 90 - 280Vac Input** 

## **Derating 305Vac Input** 

KAS Series 

3 

## **TDK-Lambda France SAS** 

Tel: +33 1 60 12 71 65 france@fr.tdk-lambda.com www.emea.lambda.tdk.com/fr 

## **TDK-Lambda Americas** 

Tel:  +1 800-LAMBDA-4 or 1-800-526-2324 powersolutions@us.tdk-lambda.com www.us.lambda.tdk.com 

## **Italy Sales Office** 

Tel: +39 02 61 29 38 63 info.italia@it.tdk-lambda.com www.emea.lambda.tdk.com/it 

## **Netherlands** 

## **TDK Electronics do Brasil Ltda** 

Tel: +55 11 3289-9599 sales.br@tdk-electronics.tdk.com www.tdk-electronics.tdk.com/en 

info@nl.tdk-lambda.com www.emea.lambda.tdk.com/nl 

## **TDK-Lambda Germany GmbH** 

Tel: +49 7841 666 0 info@de.tdk-lambda.com www.emea.lambda.tdk.com/de 

## **TDK-Lambda Corporation** 

Tel: +81-3-6778-1113 www.jp.lambda.tdk.com 

## **TDK-Lambda (China) Electronics Co. Ltd.** 

Tel: +86 21 6485-0777 powersolutions@cn.tdk-lambda.com www.lambda.tdk.com.cn 

## **TDK-Lambda Singapore Pte Ltd.** 

**Austria Sales Office** Tel: +43 2256 655 84 info@at.tdk-lambda.com www.emea.lambda.tdk.com/at 

## **Switzerland Sales Office** 

Tel: +41 44 850 53 53 info@ch.tdk-lambda.com www.emea.lambda.tdk.com/ch 

Tel: +65 6251 7211 tls.mkt@sg.tdk-lambda.com www.sg.lambda.tdk.com 

## **TDK India Private Limited, Power Supply Division** 

Tel:   +91 80 4039-0660 mathew.philip@in.tdk-lambda.com www.sg.lambda.tdk.com 

## **Nordic Sales Office** 

Tel: +45 8853 8086 info@dk.tdk-lambda.com www.emea.lambda.tdk.com/dk 

**TDK-Lambda UK Ltd.** Tel: +44 (0) 12 71 85 66 66 info@uk.tdk-lambda.com www.emea.lambda.tdk.com/uk 

**TDK-Lambda Ltd.** Tel: +9 723 902 4333 info@tdk-lambda.co.il www.emea.lambda.tdk.com/il 

## **C.I.S.** 

**Commercial Support:** Tel: +7 (495) 665 2627 **Technical Support:** Tel: +7 (812) 658 0463 info@tdk-lambda.ru www.emea.lambda.tdk.com/ru 

For additional information, please visit https://product.tdk.com/en/power/ 

KAS4_ Datasheet_260885 April 8th, 2022 V1 

KAS Series 

4

Updated at June 3, 2026

TDK-Lambda is globally recognized as a premier manufacturer of highly reliable power supply solutions and power management equipment. With a strong engineering heritage, the company is a trusted partner for mission-critical applications across the industrial, medical, telecommunications, and test and measurement sectors, delivering components that meet stringent international performance and safety standards. Our extensive portfolio of TDK-Lambda products is heavily focused on comprehensive power and line protection, highlighted by a vast selection of industry-leading AC/DC converters. Engineered to deliver exceptional efficiency and stable performance in demanding environments, these power supplies form the backbone of our offering and are built to support the rigorous power demands of modern electronic infrastructure. To complement these primary power solutions, we also offer a targeted range of high-performance DC/DC converters designed for precise, board-level voltage regulation. Furthermore, to ensure the optimal performance and longevity of these power systems, our catalog includes specialized cooling and thermal management components, such as natural convection heat sinks, providing complete thermal stability for your most critical designs.

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