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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Taiwan Semiconductor Corporation P4KE39A

Name: P4KE39A
Brand: Taiwan Semiconductor Corporation
SKU: P4KE39A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: P4KE39A

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: P4KE39A.pdf

Description:: TVS DIODE 33.3VWM 53.9VC DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:5,496

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Product details

Overview

P4KE39A from Taiwan Semiconductor is a unidirectional transient voltage suppressor diode (TVS) designed for primary-level overvoltage protection in DC power rails and signal lines. It features a 39 V nominal breakdown voltage, 33.3 V working stand-off voltage, 53.9 V maximum clamping voltage at 7.7 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.

For engineers reviewing the P4KE39A datasheet, P4KE39A pinout, P4KE39A application, or P4KE39A equivalent, key selection criteria include clamping voltage margin relative to protected IC V_DD, leakage current below 1 µA at 33.3 V, DO-41 package compatibility with manual and automated assembly, and AEC-Q101 qualification for automotive-grade reliability validation.

Technical Context

The P4KE39A operates as a silicon avalanche diode with fast response time (<1.0 ps from 0 V to V_BR) and low dynamic impedance, enabling effective suppression of ESD and electrical fast transients (EFT). Its unidirectional polarity ensures asymmetric conduction-blocking reverse current until breakdown, then clamping forward surges above V_WM.

It complies with ANSI/IEEE C62.35 for peak pulse testing and supports steady-state power dissipation up to 1 W at 75 °C lead temperature. The device is rated for junction temperatures from –55 °C to +175 °C and meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	33.3 V - Maximum continuous reverse voltage before significant leakage; sets upper limit for protected circuit operating voltage
V_BR @ I_T=1 mA	37.1–41.0 V - Measured breakdown range confirming reliable turn-on threshold under standardized test conditions
V_C @ I_PPM=7.7 A	53.9 V - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by downstream components
P_PK	400 W - Peak pulse power handling capability; determines survivability against IEC 61000-4-5 Level 3/4 surges
I_R @ V_WM	<1 µA - Reverse leakage at stand-off voltage; ensures minimal power loss and signal integrity in high-impedance circuits
T_J max	+175 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial environments
Package	DO-204AL (DO-41) - Standard axial-leaded through-hole package with tin-plated leads compliant to J-STD-002 solderability

Pinout & Package

DO-204AL (DO-41) package with axial leads: cathode indicated by band marking; anode and cathode terminals are non-polarized in layout but functionally asymmetric for unidirectional operation.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential side (e.g., GND or return path); conducts during positive surge events when cathode is at higher potential
Cathode	Avalanche clamping terminal	Connected to protected line (e.g., 24 V rail); initiates avalanche breakdown when voltage exceeds V_BR, shunting surge current to ground

Key Features

Feature	Design Value
400 W peak pulse power (10/1000 µs)	Enables robust protection against IEC 61000-4-5 surges up to 1 kV open-circuit / 500 A short-circuit without degradation
<1.0 ps response time (0 V → V_BR)	Clamps transients before sensitive logic or analog circuitry experiences damaging overvoltage
AEC-Q101 qualified option available	Validated for automotive applications including engine control units, body electronics, and infotainment power supplies
UL 94V-0 molding compound	Ensures flame-retardant housing suitable for enclosed industrial enclosures and safety-critical systems
RoHS and halogen-free compliance	Meets EU environmental directives and IEC 61249-2-21 for green manufacturing and end-of-life processing

Applications

Automotive Power Input Protection	Industrial Sensor Signal Line Protection
Use Scenario: 12 V/24 V battery-fed ECUs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary TVS clamp on main power rail upstream of DC-DC converter input. Use Value: Limits transient voltage to ≤53.9 V, preventing damage to 36 V-rated input stages and maintaining system uptime during vehicle cranking.	Use Scenario: 4–20 mA current loop sensors in factory automation subject to EFT bursts. IC Role / Device Role / Timing Role: Unidirectional shunt protector across sensor output terminals. Use Value: Sub-µA leakage preserves loop accuracy; <1.0 ps response prevents ADC saturation during 5 kHz EFT noise coupling.
LED Driver Overvoltage Clamp	RS-485 Transceiver Port Protection
Use Scenario: Constant-current LED drivers in street lighting subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-mode TVS placed between driver output and string anode. Use Value: 33.3 V V_WM allows normal 36 V string operation while clamping 1 kV surges to 53.9 V, avoiding MOSFET gate oxide failure.	Use Scenario: Industrial RS-485 nodes connected to long cables in electrically noisy plants. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (P4KE39A used with external diode pair) on bus lines. Use Value: 400 W rating absorbs multiple 10/1000 µs surges without derating; DO-41 footprint simplifies board-level retrofitting.

Automotive Power Input Protection

Industrial Sensor Signal Line Protection

Use Scenario: 12 V/24 V battery-fed ECUs exposed to load dump and ISO 7637-2 pulses.

IC Role / Device Role / Timing Role: Primary TVS clamp on main power rail upstream of DC-DC converter input.

Use Value: Limits transient voltage to ≤53.9 V, preventing damage to 36 V-rated input stages and maintaining system uptime during vehicle cranking.

Use Scenario: 4–20 mA current loop sensors in factory automation subject to EFT bursts.

IC Role / Device Role / Timing Role: Unidirectional shunt protector across sensor output terminals.

Use Value: Sub-µA leakage preserves loop accuracy; <1.0 ps response prevents ADC saturation during 5 kHz EFT noise coupling.

LED Driver Overvoltage Clamp

RS-485 Transceiver Port Protection

Use Scenario: Constant-current LED drivers in street lighting subjected to lightning-induced surges.

IC Role / Device Role / Timing Role: Standoff-mode TVS placed between driver output and string anode.

Use Value: 33.3 V V_WM allows normal 36 V string operation while clamping 1 kV surges to 53.9 V, avoiding MOSFET gate oxide failure.

Use Scenario: Industrial RS-485 nodes connected to long cables in electrically noisy plants.

IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (P4KE39A used with external diode pair) on bus lines.

Use Value: 400 W rating absorbs multiple 10/1000 µs surges without derating; DO-41 footprint simplifies board-level retrofitting.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Littelfuse P4KE39A	Identical electrical specs (V_WM=33.3 V, V_C=53.9 V), same DO-41 package, UL 497B listed	No functional difference; validated in identical automotive and industrial reference designs	Select for dual-sourcing assurance where Littelfuse is already qualified in BOM
ON Semiconductor 1.5KE39A	Higher P_PK = 1500 W, larger DO-201 package (7.62 mm body), 5% tighter V_BR tolerance (37.1–39.0 V)	Better suited for high-energy surges but requires PCB re-layout due to larger footprint and lead spacing	Choose only when surge threat level exceeds 400 W or when tighter V_BR tolerance is required for precision clamping

Compared with Littelfuse P4KE39A, Taiwan Semiconductor's version offers identical performance in same footprint and qualification scope; versus ON Semi 1.5KE39A, it trades higher energy handling for smaller size and lower cost - optimal for space-constrained 24 V systems where 400 W suffices.

Availability

P4KE39A is available at Aetrix Electronics and suitable for automotive power inputs, industrial sensor interfaces, LED driver protection, and RS-485 port hardening requiring stable component supply across production lifecycles.

Supply support for P4KE39A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs with global distribution and AEC-Q101 qualification capabilities.

The P4KE series targets cost-sensitive, high-reliability transient suppression in automotive, industrial, and consumer power systems - emphasizing robust surge handling, tight parametric consistency, and regulatory compliance out-of-the-box.

FAQ

What is the maximum clamping voltage of the P4KE39A under standard surge conditions?

The P4KE39A exhibits a maximum clamping voltage (V_C) of 53.9 V when subjected to a 10/1000 µs waveform with a peak pulse current (I_PPM) of 7.7 A. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The P4KE39A maintains this clamping performance across its full operating temperature range of –55 °C to +175 °C.

Is the P4KE39A suitable for automotive applications?

Yes, the P4KE39A is available in an AEC-Q101 qualified variant (marked with "H" suffix, e.g., P4KE39AH), which undergoes stress testing for temperature cycling, humidity, mechanical shock, and high-temperature operating life. While the base P4KE39A is not automatically qualified, Taiwan Semiconductor explicitly lists AEC-Q101 qualification as available for the P4KE series - making P4KE39A a viable candidate for automotive power rail protection when sourced in the qualified version.

How does the P4KE39A differ from the P4KE39 part number?

The P4KE39A features tighter breakdown voltage tolerance: 37.1–41.0 V (±5.2%) versus P4KE39's 35.1–42.9 V (±11.1%). This improved consistency reduces design margin uncertainty and improves predictability of clamping onset. Both share identical V_WM (33.3 V), V_C (53.9 V), P_PK (400 W), and DO-41 packaging - allowing direct substitution where tighter V_BR control is needed without layout changes.

What is the reverse leakage current specification for the P4KE39A at its working voltage?

The P4KE39A specifies a maximum reverse leakage current (I_R) of 1 µA when biased at its working stand-off voltage (V_WM) of 33.3 V and tested at 25 °C. This ultra-low leakage ensures minimal power loss in always-on systems and preserves signal integrity in high-impedance sensing paths. Leakage remains below 5 µA up to 85 °C per thermal derating curves in the official datasheet.

Can the P4KE39A be used in bidirectional configurations?

No - the P4KE39A is a unidirectional TVS diode, intended for DC circuits with defined polarity. For bidirectional protection (e.g., AC lines or differential buses), Taiwan Semiconductor recommends the CA-suffixed variant (e.g., P4KE39CA) or discrete back-to-back P4KE39A pairs. Using a single P4KE39A in reverse-biased mode risks permanent breakdown if reverse voltage exceeds V_WM, as it lacks symmetrical avalanche characteristics.

P4KE39A Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Package/Case:: DO-204AL, DO-41, Axial

Series:: P4KE

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 33.3V

Voltage - Breakdown (Min):: 37.1V

Voltage - Clamping (Max) @ Ipp:: 53.9V

Current - Peak Pulse (10/1000µs):: 7.7A

Power - Peak Pulse:: 400W

Power Line Protection:: No

Applications:: General Purpose

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AL (DO-41)

P4KE39A FAQ

1.How can I place an order for P4KE39A through Aetrix?

Please submit a Request for Quotation (RFQ) for P4KE39A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for P4KE39A reliable?

The price and inventory of P4KE39A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4KE39A is usually 5 days.

3.What payment methods are accepted for P4KE39A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4KE39A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for P4KE39A?

P4KE39A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your P4KE39A order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for P4KE39A?

For technical support, including P4KE39A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4KE39A requirements.

6.How does Aetrix verify that P4KE39A is sourced from the original manufacturer or authorized distributors?

All P4KE39A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that P4KE39A meets industry standards.

7.What is the process for return or replacement of P4KE39A?

All P4KE39A units undergo pre-shipment inspection (PSI). If there is an issue with P4KE39A, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The P4KE39A part is unused and in its original packaging.

Return procedure for P4KE39A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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