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Taiwan Semiconductor Corporation P4SMA51A
- Part No.:
- P4SMA51A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA51A.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,444
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Product details
Overview
P4SMA51A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping ESD and surge transients in DC power rails. It features a 43.6 V working stand-off voltage (VWM), 48.5–53.6 V breakdown voltage (VBR) at 1 mA, 70.1 V maximum clamping voltage (VC) at 6.0 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the P4SMA51A datasheet, P4SMA51A pinout, P4SMA51A application, or P4SMA51A equivalent, key selection considerations include its unidirectional polarity, low leakage (<1 µA at VWM), fast sub-1 ps response time, ISO 7637-2 compliance for automotive transients, and suitability for compact board-level protection in SMPS, DC/DC converters, and lighting drivers.
Technical Context
The P4SMA51A operates as a silicon avalanche diode with glass-passivated junction, optimized for unidirectional transient suppression on positive-rail lines. Its clamping behavior follows standardized 10/1000 µs surge waveform testing per ANSI/IEEE C62.35, with thermal derating above 25°C ambient per published pulse derating curve.
It exhibits a temperature coefficient of VBR of +0.102 %/°C and supports operating junction temperatures from –55°C to +150°C. The device is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and maintains <1 µA reverse leakage at its full VWM of 43.6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43.6 V - Maximum continuous reverse voltage before significant leakage; sets upper limit for protected rail voltage |
| VBR min/max | 48.5 V / 53.6 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above normal operating voltage |
| VC @ IPPM | 70.1 V at 6.0 A (10/1000 µs) - Clamped voltage during worst-case surge; defines maximum stress on downstream ICs |
| PPPM | 400 W - Peak pulse power handling capability; enables robust protection against IEC 61000-4-5 and ISO 7637-2 pulses |
| IR @ VWM | <1 µA - Ultra-low reverse leakage; avoids unnecessary power loss or bias interference in high-impedance circuits |
| Response time | <1.0 ps - Sub-picosecond junction response; ensures clamping activation before transient energy couples into sensitive nodes |
| TJ max | +150 °C - Maximum junction temperature rating; supports operation in under-hood or enclosed industrial environments |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode unidirectional configuration. Cathode indicated by molded band on case. Matte tin-plated leads, RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or return path; completes clamping loop during positive transients on cathode side |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., +12 V rail); conducts surge current to ground when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enhances long-term reliability and moisture resistance; meets J-STD-020 Level 1 MSL rating |
| ISO 7637-2 compliance | Validated for Pulse 1, 2a, 2b, 3a, and 3b waveforms - suitable for automotive power-line surge immunity |
| UL 94V-0 molding compound | Self-extinguishing encapsulation material - satisfies flammability requirements for safety-critical PCB layouts |
| Automated placement compatibility | DO-214AC footprint and lead geometry optimized for SMT pick-and-place systems without tombstoning risk |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth under thermal cycling - critical for extended-life industrial and automotive deployments |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side input rectifier and secondary-side output rail against line surges and load-dump transients. IC Role / Device Role: Unidirectional TVS placed between output rail and ground to clamp positive-going overvoltage spikes. Use Value: Limits output voltage excursion to ≤70.1 V during 400 W surges, preventing damage to downstream regulators and controllers. |
Use Scenario: Input-side surge suppression in point-of-load (POL) converters powering FPGAs or microcontrollers. IC Role / Device Role: Rail-to-ground clamping element on 3.3 V, 5 V, or 12 V converter outputs subject to coupling from adjacent switching stages. Use Value: With <1 µA leakage at 43.6 V, P4SMA51A avoids loading low-current standby rails while delivering fast clamping response. |
| LED Lighting Driver | Automotive Body Control Module (BCM) |
Use Scenario: Overvoltage protection on constant-current LED string supply lines exposed to inductive kickback from driver MOSFETs. IC Role / Device Role: Transient shunt across LED anode and ground to absorb turn-off spikes from boost or buck drivers. Use Value: 70.1 V clamping voltage ensures LED strings rated up to 48 V remain within safe operating area during 6 A surge events. |
Use Scenario: Input protection for 12 V power inputs in BCMs subjected to ISO 7637-2 Pulse 2b (battery disconnect) and Pulse 5a (load dump). IC Role / Device Role: Primary front-end TVS on main power entry, positioned before fuse and upstream of LDOs or CAN transceivers. Use Value: 400 W rating and validated ISO 7637-2 compliance enable direct use in automotive-grade designs without additional external filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A (Bourns) | Same DO-214AA (SMB) package; 51 V VBR range; 600 W PPPM rating; higher clamping voltage (73.5 V) | Higher power handling but larger footprint; less suitable for space-constrained SMA layouts | Select SMBJ51A only if board area allows SMB package and >400 W surge margin is required |
| 1.5SMC51A (ON Semiconductor) | DO-214AB (SMC) package; identical VBR/VWM specs; 1500 W PPPM; 73.5 V VC; 1.5 g weight | Higher surge capacity but 2.5× larger footprint and thermal mass; not drop-in compatible | Choose 1.5SMC51A for high-energy industrial surge environments where PCB space permits SMC outline |
Compared with SMBJ51A and 1.5SMC51A, the P4SMA51A offers optimal balance of compact DO-214AC footprint, 400 W surge rating, and 70.1 V clamping - making it preferred for cost-sensitive, space-limited consumer and automotive auxiliary electronics where strict adherence to SMA land patterns is required.
Availability
P4SMA51A is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and LED lighting drivers requiring stable component supply with full traceability and lifecycle management.
Supply support for P4SMA51A 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-Q200 qualified product lines.
The P4SMA51A belongs to TSC's P4SMA series of surface-mount TVS diodes engineered for high-reliability transient suppression in automotive, industrial, and consumer power systems - emphasizing low leakage, precise VBR tolerance, and standardized surge compliance.
FAQ
What is the polarity configuration of the P4SMA51A?
The P4SMA51A is a unidirectional TVS diode, with cathode marked by a visible band on the DO-214AC package body. It conducts only during positive transients on the cathode terminal relative to anode (ground), making it suitable for protecting positive DC rails. Bidirectional variants use "C" or "CA" suffixes - the P4SMA51A does not support symmetrical clamping.
Does the P4SMA51A meet automotive surge standards?
Yes, the P4SMA51A meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, as explicitly stated in its datasheet. This validation confirms its suitability for 12 V automotive power network protection, including load-dump and battery-disconnect transients, without requiring supplemental external components.
What is the maximum clamping voltage of the P4SMA51A under surge conditions?
The P4SMA51A has a maximum clamping voltage (VC) of 70.1 V when subjected to its rated peak pulse current of 6.0 A using the standard 10/1000 µs waveform. This value is measured at the device terminals and defines the highest voltage seen by downstream circuitry during a full-power transient event.
Can the P4SMA51A be used in bidirectional signal line protection?
No - the P4SMA51A is strictly unidirectional and lacks symmetrical breakdown characteristics. For bidirectional data or AC line protection, engineers must select a "C" or "CA" variant (e.g., P4SMA51CA) or alternate devices specifically characterized for dual-polarity conduction and clamping.
What is the moisture sensitivity level (MSL) rating for the P4SMA51A?
The P4SMA51A carries a J-STD-020 Moisture Sensitivity Level (MSL) rating of Level 1, meaning it is not moisture-sensitive and may be stored indefinitely at ambient conditions without baking prior to reflow soldering - simplifying manufacturing handling and reducing process overhead.
P4SMA51A 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):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 6A
- 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)
P4SMA51A FAQ
1.How can I place an order for P4SMA51A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA51A 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 P4SMA51A reliable?
The price and inventory of P4SMA51A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA51A is usually 5 days.
3.What payment methods are accepted for P4SMA51A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA51A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA51A?
P4SMA51A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA51A 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 P4SMA51A?
For technical support, including P4SMA51A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA51A requirements.
6.How does Aetrix verify that P4SMA51A is sourced from the original manufacturer or authorized distributors?
All P4SMA51A 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 P4SMA51A meets industry standards.
7.What is the process for return or replacement of P4SMA51A?
All P4SMA51A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA51A, 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 P4SMA51A part is unused and in its original packaging.
Return procedure for P4SMA51A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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