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Taiwan Semiconductor Corporation P4SMA39
- Part No.:
- P4SMA39
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA39.pdf
- Description:
- 400W, 39V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,463
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Product details
Overview
P4SMA39 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 35.1–42.9 V breakdown voltage (VBR), 31.6 V working stand-off voltage (VWM), and clamps to ≤56.4 V at 7.4 A peak pulse current under 10/1000 µs waveform - ideal for safeguarding SMPS outputs and DC/DC converter inputs against ESD and surge events.
For engineers reviewing the P4SMA39 datasheet, P4SMA39 pinout, P4SMA39 application, or P4SMA39 equivalent, key selection criteria include its 400 W peak pulse power rating, <1 µA reverse leakage at VWM, ±0.100 %/°C VBR temperature coefficient, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive-level transients.
Technical Context
The P4SMA39 operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown behavior and low leakage. Its clamping action begins at VBR ≥35.1 V and limits transient energy by diverting surge current to ground while maintaining system-side voltage below 56.4 V at rated IPPM.
Designed for surface-mount assembly and rated for TJ = –55°C to +150°C, it supports automated placement and meets J-STD-020 moisture sensitivity level 1. The device sustains 40 A non-repetitive forward surge (IFSM, 8.3 ms half-sine) and exhibits fast response (<1 ps), enabling protection of sensitive downstream ICs in power conversion and lighting circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1.0 mA | 35.1–42.9 V: Ensures reliable avalanche conduction onset within defined tolerance band |
| VWM | 31.6 V: Maximum continuous DC operating voltage before significant leakage |
| IR @ VWM | <1 µA: Negligible standby power loss and minimal impact on high-impedance sensing nodes |
| VC @ IPPM=7.4 A | ≤56.4 V: Clamped voltage during 10/1000 µs surge, defining protected circuit's maximum stress level |
| PPPM | 400 W: Peak transient power handling capability per single event, per JEDEC standard waveform |
| TJ max | +150 °C: Enables operation in high-temperature environments such as enclosed power supplies |
| Package | DO-214AC (SMA): Industry-standard SMD outline compatible with automated reflow and wave soldering |
Pinout & Package
DO-214AC (SMA) package with axial lead configuration: Cathode indicated by band-marked end; anode is unmarked end. Matte tin-plated leads meet J-STD-002 solderability requirements. Polarity-sensitive mounting required for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VLINE exceeds VBR |
| Anode (unmarked end) | Reference node | Typically tied to system ground or low-impedance return path for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling |
| Fast response time <1 ps | Enables suppression of nanosecond-scale ESD events before downstream ICs experience overstress |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive load-dump and inductive-switching transient immunity |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental regulations without compromising electrical performance |
| Moisture sensitivity level 1 | Eliminates need for dry-packaging or baking prior to assembly |
Applications
| Switching Mode Power Supply (SMPS) Output Protection | On-Board DC/DC Converter Input |
|---|---|
Use Scenario: Protects regulated 24–48 V output rails in AC/DC adapters and telecom PSUs from load dump and coupling transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between output rail and ground, clamping surges before they reach post-regulation filtering or connected loads. Use Value: Maintains output integrity below 56.4 V during 400 W transients, preventing latch-up or damage to downstream POL converters and microcontrollers. | Use Scenario: Shields input stage of isolated or non-isolated buck converters in industrial PLCs and motor drives. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing line-side spikes induced by relay switching or nearby inductive loads. Use Value: With 31.6 V VWM, it tolerates normal 36 V nominal bus ripple while clamping 7.4 A surges to ≤56.4 V - preserving converter enable thresholds and feedback stability. |
| LED Driver Power Input | Automotive Body Control Module (BCM) Power Rail |
Use Scenario: Safeguards constant-current LED drivers in streetlight and architectural lighting against mains-borne surges and hot-swap transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on HV DC bus feeding boost/buck-boost controller ICs. Use Value: Low 1 µA leakage avoids false triggering of undervoltage lockout; 400 W rating handles repetitive lightning-induced surges in outdoor installations. | Use Scenario: Installed on 12 V battery-fed power nets in BCMs to meet OEM EMC requirements per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional transient suppressor on MCU supply rail, coordinated with upstream fuses and LC filters. Use Value: Clamps Pulse 1 (inductive switch-off) to ≤56.4 V within 1 ps, ensuring MCU reset logic remains functional and EEPROM writes complete reliably. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A (Bourns) | DO-214AA (SMB) package; 36 V VWM, 58.1 V VC @ 6.9 A; same 400 W rating | Larger footprint; higher clamping voltage reduces margin for 3.3 V/5 V logic rails | Select when board space allows SMB and tighter VC tolerance is not critical |
| 1.5SMC39A (ON Semiconductor) | DO-214AB (SMC) package; 39 V VWM, 60.0 V VC @ 6.7 A; 1500 W rating | Higher power rating but larger size; less suitable for dense layouts | Choose for higher-energy transients where PCB area permits larger SMC outline |
Compared with SMBJ36A and 1.5SMC39A, the P4SMA39 offers optimal balance of compact DO-214AC footprint, precise 31.6 V standoff, and low 56.4 V clamping - making it preferred for space-constrained 24–48 V industrial and lighting designs requiring tight voltage margins.
Availability
P4SMA39 is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and LED driver applications requiring stable component supply across extended production lifecycles.
Supply support for P4SMA39 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The P4SMA series belongs to TSC's high-reliability surface-mount TVS portfolio, engineered specifically for industrial-grade surge immunity in power conversion, lighting, and automotive subsystems where consistent clamping performance and long-term stability are critical.
FAQ
What is the polarity configuration of the P4SMA39?
The P4SMA39 is a unidirectional TVS diode with cathode identified by a band-marked end. It conducts only when the cathode is at a higher potential than the anode - meaning it protects positive-going transients on lines referenced to ground. This configuration ensures low leakage during normal operation and precise clamping during overvoltage events, distinguishing it from bidirectional variants like P4SMA39CA.
Does the P4SMA39 meet automotive transient standards?
Yes, the P4SMA39 meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), verified per manufacturer test data. Its 400 W peak power rating and 56.4 V clamping voltage at 7.4 A make it suitable for protecting 12 V and 24 V automotive power nets, provided layout minimizes inductance in the ground path to maintain effective clamping speed.
What is the maximum operating temperature for the P4SMA39?
The P4SMA39 has a specified junction temperature range of –55°C to +150°C, with derated power dissipation above 25°C ambient per the published pulse derating curve. At +125°C ambient, its usable peak pulse power drops to approximately 220 W - a critical consideration for thermally constrained enclosures in industrial power supplies where the P4SMA39 must sustain repeated surge events without thermal runaway.
How does the P4SMA39 compare to the P4SMA39A variant?
The P4SMA39A offers tighter VBR tolerance (37.1–41.0 V vs. 35.1–42.9 V for P4SMA39) and slightly higher VWM (33.3 V vs. 31.6 V), resulting in improved noise immunity for systems operating near the upper edge of the 31.6 V standoff. Both share identical DO-214AC packaging, 400 W rating, and clamping performance (53.9 V vs. 56.4 V), making the P4SMA39A preferable where tighter voltage control is required without changing PCB layout.
Can the P4SMA39 be used in bidirectional signal-line protection?
No - the P4SMA39 is strictly unidirectional and unsuitable for AC or bidirectional signal lines. For such applications, engineers must select a bidirectional variant like P4SMA39CA, which uses dual-die construction to provide symmetrical clamping in both polarities. Using the P4SMA39 on AC signals risks forward conduction during negative half-cycles, potentially damaging the device or distorting signal integrity.
P4SMA39 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA39 FAQ
1.How can I place an order for P4SMA39 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA39 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 P4SMA39 reliable?
The price and inventory of P4SMA39 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA39 is usually 5 days.
3.What payment methods are accepted for P4SMA39?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA39 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA39?
P4SMA39 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA39 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 P4SMA39?
For technical support, including P4SMA39 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA39 requirements.
6.How does Aetrix verify that P4SMA39 is sourced from the original manufacturer or authorized distributors?
All P4SMA39 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 P4SMA39 meets industry standards.
7.What is the process for return or replacement of P4SMA39?
All P4SMA39 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA39, 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 P4SMA39 part is unused and in its original packaging.
Return procedure for P4SMA39:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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