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Taiwan Semiconductor Corporation P4SMA39H
- Part No.:
- P4SMA39H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA39H.pdf
- Description:
- 400W, 39V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,757
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Product details
Overview
P4SMA39H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power, 35.1–42.9V breakdown voltage at 1mA test current, and 56.4V clamping voltage at 7.4A 10/1000μs surge. It protects DC/DC converters and automotive power rails against ESD and ISO 7637-2 transients.
For engineers reviewing the P4SMA39H datasheet, P4SMA39H pinout, P4SMA39H application, or P4SMA39H equivalent, key selection criteria include its 31.6V working stand-off voltage, <1μA reverse leakage at VWM, AEC-Q101 qualification, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics robustness.
Technical Context
The P4SMA39H operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast response (<1.0ps) and stable clamping under repetitive surge stress. Its thermal design supports continuous operation from –55°C to +150°C junction temperature, with derating above 25°C ambient per published pulse derating curve.
It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, enabling compatibility with standard reflow profiles. Polarity is marked by cathode band; terminals are matte tin-plated for reliable solderability per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 35.1V / 42.9V at 1mA - defines minimum and maximum guaranteed avalanche initiation range under standardized test conditions |
| VWM | 31.6V - maximum continuous reverse operating voltage before significant leakage begins |
| VC@IPPM | 56.4V at 7.4A (10/1000μs) - peak clamped voltage seen by protected circuit during worst-case surge |
| IR@VWM | <1μA - ensures negligible standby power loss and signal integrity in high-impedance circuits |
| PPPM | 400W - peak transient energy handling capacity using standard 10/1000μs waveform |
| TJ max | +150°C - enables use in under-hood automotive environments and thermally constrained PCB layouts |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline with 0.060g mass and UL 94V-0 molding compound |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with axial leads formed into gull-wing configuration; cathode indicated by band on body; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage rail; completes conduction path during reverse surge |
| Cathode | Protected line input | Connected to line being protected (e.g., 24V supply rail); clamps to anode when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress requirements |
| Glass passivated junction | Enables stable VBR tolerance and long-term leakage performance across life cycle and temperature extremes |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Fast response time | <1.0ps typical - limits voltage overshoot before clamping engages, critical for protecting fast logic and analog inputs |
| Moisture sensitivity level 1 | No dry-pack or baking required prior to SMT assembly - reduces manufacturing overhead and process risk |
Applications
| Automotive Power Distribution | Industrial DC/DC Converters |
|---|---|
Use Scenario: Protection of 24V battery-fed control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges exceeding 31.6V. Use Value: Limits transient voltage to ≤56.4V during 7.4A 10/1000μs events, preventing damage to downstream regulators and microcontrollers. | Use Scenario: Input surge suppression for isolated 48V-to-12V DC/DC converters in factory automation equipment. IC Role / Device Role / Timing Role: Primary-line TVS on secondary-side output to absorb coupled noise and switching spikes. Use Value: Maintains <1μA leakage at 31.6V, avoiding regulation error in precision feedback loops while delivering 400W pulse immunity. |
| LED Driver Power Inputs | Telecom Power Interfaces |
Use Scenario: Overvoltage protection for constant-current LED drivers powered from 36V industrial supplies. IC Role / Device Role / Timing Role: Standoff-rated TVS on driver input to prevent latch-up during field wiring faults. Use Value: 35.1–42.9V VBR window ensures activation only during fault, not normal 36V operation, preserving system uptime. | Use Scenario: Surge protection on -48V telecom power feeds exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS referenced to return rail, absorbing positive-going transients on negative supply lines. Use Value: Cathode-to-anode orientation allows direct integration into legacy -48V infrastructure without polarity redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A | 600W rating, 36V VWM, DO-214AA (SMB) package - larger footprint, higher power but lower voltage margin | Preferred where higher surge margin is needed and board space permits SMB outline | Select SMBJ36A if system-level testing requires >400W immunity or if layout accommodates larger DO-214AA |
| 1.5SMC39A | 1500W rating, same 31.6V VWM, DO-214AB (SMC) package - 3× footprint area, higher IPPM (32.4A) | Suitable for high-energy industrial mains interfaces where DO-214AC is underspecified | Choose 1.5SMC39A only when surge threat exceeds ISO 7637-2 and requires >400W dissipation |
Compared with P4SMA39H, SMBJ36A offers higher power but looser voltage tolerance and larger package, while 1.5SMC39A delivers triple the surge capacity at the cost of PCB area - P4SMA39H remains optimal for space-constrained AEC-Q101-compliant 24V/36V automotive and industrial modules.
Availability
P4SMA39H is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC/DC converters, and LED driver protection requiring stable component supply and AEC-Q101 assurance.
Supply support for P4SMA39H 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 automotive and industrial certifications.
The P4SMA39H belongs to TSC's AEC-Q101-qualified P4SMAxH series of surface-mount TVS diodes, engineered specifically for robust transient suppression in automotive ECUs, body control modules, and industrial power supplies.
FAQ
What is the clamping voltage of the P4SMA39H under standard 10/1000μs surge conditions?
The P4SMA39H has a maximum clamping voltage (VC) of 56.4V at 7.4A peak pulse current using the 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and represents the highest voltage imposed on the protected circuit during full-rated surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the P4SMA39H suitable for bidirectional transient protection?
No, the P4SMA39H is a unidirectional TVS diode intended for protection against positive-going transients on grounded systems. For bidirectional applications, TSC specifies the P4SMA39AH variant (marked BWJ) or parts with CH/CAH suffixes - these have symmetrical breakdown characteristics and require different layout considerations.
Does the P4SMA39H meet automotive reliability standards?
Yes, the P4SMA39H is AEC-Q101 qualified and tested per JESD201 Class 2 whisker resistance, J-STD-020 Moisture Sensitivity Level 1, and ISO 7637-2 Pulse 1/2a/2b/3a/3b. These qualifications confirm suitability for under-hood and chassis-mounted automotive electronics where thermal cycling and electrical surge resilience are mandatory.
What is the maximum reverse leakage current specified for the P4SMA39H at its working stand-off voltage?
The P4SMA39H exhibits a maximum reverse leakage current (IR) of 1μA at its rated working stand-off voltage (VWM) of 31.6V. This ultra-low leakage ensures minimal power loss and avoids interference with high-impedance sensing circuits or precision voltage references in battery-powered or energy-sensitive designs.
Can the P4SMA39H be used in lead-free reflow processes without special handling?
Yes, the P4SMA39H is rated MSL Level 1 per J-STD-020 and uses matte tin-plated leads compliant with J-STD-002 solderability requirements. It withstands standard Pb-free reflow profiles up to 260°C peak without baking or dry-pack - simplifying SMT line integration and reducing process variability.
P4SMA39H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 31.6V
- Voltage - Breakdown (Min):
- 35.1V
- Voltage - Clamping (Max) @ Ipp:
- 56.4V
- Current - Peak Pulse (10/1000µs):
- 7.4A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA39H FAQ
1.How can I place an order for P4SMA39H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA39H 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 P4SMA39H reliable?
The price and inventory of P4SMA39H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA39H is usually 5 days.
3.What payment methods are accepted for P4SMA39H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA39H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA39H?
P4SMA39H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA39H 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 P4SMA39H?
For technical support, including P4SMA39H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA39H requirements.
6.How does Aetrix verify that P4SMA39H is sourced from the original manufacturer or authorized distributors?
All P4SMA39H 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 P4SMA39H meets industry standards.
7.What is the process for return or replacement of P4SMA39H?
All P4SMA39H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA39H, 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 P4SMA39H part is unused and in its original packaging.
Return procedure for P4SMA39H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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