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Taiwan Semiconductor Corporation P4SMA51
- Part No.:
- P4SMA51
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA51.pdf
- Description:
- 400W, 51V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,170
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Product details
Overview
P4SMA51 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power lines and signal paths. It features a 41.3 V working stand-off voltage, 45.9–56.1 V breakdown voltage at 1 mA, 73.5 V maximum clamping voltage under 5.7 A 10/1000 μs surge, and 400 W peak pulse power rating in DO-214AC (SMA) package - deployed in SMPS input stages and on-board DC/DC converters.
For engineers reviewing the P4SMA51 datasheet, P4SMA51 pinout, P4SMA51 application, or P4SMA51 equivalent, key selection criteria include clamping performance at rated surge current, leakage current below 1 µA at VWM, compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and compatibility with automated SMT assembly in high-reliability industrial power supplies.
Technical Context
The P4SMA51 operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response time (<1.0 ps) and stable breakdown characteristics across -55°C to +150°C junction temperature range. Its single-die DO-214AC construction supports 40 A non-repetitive forward surge capability and maintains <3.5 V forward voltage at 25 A.
Designed for transient suppression per IEC 61000-4-2/4-4/4-5 and automotive ISO 7637-2, it delivers precise clamping with 0.102 %/°C temperature coefficient of VBR and meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 41.3 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VBR @ IT=1 mA | 45.9–56.1 V - Breakdown voltage range ensuring robust turn-on margin above VWM |
| VC @ IPPM=5.7 A | 73.5 V - Clamping voltage during 10/1000 μs surge, limiting downstream voltage stress |
| PPPM | 400 W - Peak pulse power handling capacity per single transient event |
| IR @ VWM | <1 µA - Ultra-low leakage preserves efficiency in high-impedance bias networks |
| TJ max | +150 °C - Enables operation in thermally constrained environments like enclosed power adapters |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-ended unidirectional configuration with cathode band marking. Matte tin-plated leads compliant with J-STD-002 solderability and UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., +VIN) - conducts during overvoltage to shunt surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures long-term stability of VBR and low parameter drift under thermal cycling and humidity exposure |
| Response time <1.0 ps | Clamps ESD and fast transients before sensitive ICs experience overstress |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive load-dump and inductive-switching immunity without external filtering |
| Moisture Sensitivity Level 1 | Enables standard SMT reflow without baking or special handling prior to assembly |
| RoHS & halogen-free | Meets IEC 61249-2-21 and global environmental compliance mandates for industrial and consumer end equipment |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Input stage protection against line surges and coupling transients in AC-DC front-end or DC-DC pre-regulator circuits. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and ground to clamp positive-going transients. Use Value: Limits peak voltage to 73.5 V during 5.7 A 10/1000 μs surge, preventing MOSFET gate oxide failure and controller latch-up. | Use Scenario: Protection of point-of-load (POL) converter inputs in telecom or server boards exposed to board-level switching noise. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor mounted directly at DC/DC enable or feedback node entry points. Use Value: Sub-1 µA leakage at 41.3 V avoids loading precision feedback dividers; fast response prevents overshoot-induced regulator shutdown. |
| Lighting Application | Adapters |
Use Scenario: Overvoltage safeguard in LED driver input stages subjected to hot-plug and capacitor discharge events. IC Role / Device Role / Timing Role: Primary-side transient clamp on constant-current driver input rails. Use Value: 400 W peak power rating absorbs repetitive 100 V/10 ms transients common in dimmable ballast interfaces without degradation. | Use Scenario: Secondary-side surge protection in wall-mounted AC-DC adapters for consumer electronics. IC Role / Device Role / Timing Role: Output rail protector against reverse-energy coupling from USB or data-line faults. Use Value: DO-214AC footprint enables compact layout; UL 94V-0 package supports safety certification for Class II insulated designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A (Bourns) | Same DO-214AA package; 51 V nominal VBR, 73.5 V VC, but bidirectional variant unless specified as SMBJ51A (unidirectional) | Requires verification of unidirectional marking and polarity orientation on PCB; slightly higher VWM (43.6 V) | Select when existing layout uses DO-214AA footprint and bidirectional capability is not required |
| 1.5SMC51A (ON Semiconductor) | DO-214AB (SMC) package; 51 V VBR, 73.5 V VC, same 400 W rating but larger body and higher thermal mass | Not drop-in: requires pad redesign due to 7.11 mm × 6.22 mm vs. P4SMA51's 4.57 mm × 2.79 mm footprint | Choose for higher thermal dissipation margin in high-ambient-temperature environments where space permits |
Compared with SMBJ51A and 1.5SMC51A, the P4SMA51 offers identical clamping performance in a smaller DO-214AC package with verified MSL-1 handling - making it optimal for space-constrained, high-volume SMT applications where automated placement and moisture resilience are critical.
Availability
P4SMA51 is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply with full traceability and lifecycle management.
Supply support for P4SMA51 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 protection components for industrial and automotive markets.
The P4SMA series belongs to TSC's surface-mount TVS portfolio engineered specifically for high-reliability transient suppression in compact, automated-assembly power systems - balancing clamping precision, surge robustness, and process compatibility.
FAQ
What is the maximum clamping voltage of the P4SMA51 under standard surge conditions?
The P4SMA51 has a maximum clamping voltage (VC) of 73.5 V when subjected to a 10/1000 μs waveform with a peak impulse current (IPPM) of 5.7 A. This value is measured per ANSI/IEEE C62.35 and ensures predictable voltage limiting during transient events. The P4SMA51 maintains this clamping performance across its full operating temperature range of -55°C to +150°C.
Is the P4SMA51 unidirectional or bidirectional, and how is polarity identified?
The P4SMA51 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. Polarity is marked by a cathode band on the DO-214AC package body - the banded end connects to the protected line (e.g., +VIN), while the anode connects to ground. This configuration provides asymmetric protection optimized for DC rail clamping.
Does the P4SMA51 meet automotive transient immunity standards?
Yes, the P4SMA51 meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b waveforms - covering load dump, supply interruption, and coupled transients in 12 V automotive systems. Its 400 W peak pulse rating and 73.5 V clamping voltage ensure robust protection without additional filtering in ECUs and body control modules.
What is the leakage current specification for the P4SMA51 at its working stand-off voltage?
At its working stand-off voltage (VWM) of 41.3 V, the P4SMA51 exhibits a maximum reverse leakage current (IR) of 1 µA at 25°C. This ultra-low leakage minimizes standby power loss and avoids interference with high-impedance sensing or feedback circuits commonly found in precision power supplies and LED drivers.
Can the P4SMA51 be used in reflow soldering processes without preconditioning?
Yes, the P4SMA51 is rated at Moisture Sensitivity Level 1 per J-STD-020, meaning it can be subjected to standard Pb-free reflow profiles (e.g., JEDEC J-STD-020D) without baking or dry-pack handling. Its DO-214AC package uses UL 94V-0 compliant molding compound and matte tin-plated leads qualified to J-STD-002 for reliable solder joint formation.
P4SMA51 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):
- 41.3V
- Voltage - Breakdown (Min):
- 45.9V
- Voltage - Clamping (Max) @ Ipp:
- 73.5V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- 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)
P4SMA51 FAQ
1.How can I place an order for P4SMA51 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA51 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 P4SMA51 reliable?
The price and inventory of P4SMA51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA51 is usually 5 days.
3.What payment methods are accepted for P4SMA51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA51?
P4SMA51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA51 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 P4SMA51?
For technical support, including P4SMA51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA51 requirements.
6.How does Aetrix verify that P4SMA51 is sourced from the original manufacturer or authorized distributors?
All P4SMA51 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 P4SMA51 meets industry standards.
7.What is the process for return or replacement of P4SMA51?
All P4SMA51 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA51, 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 P4SMA51 part is unused and in its original packaging.
Return procedure for P4SMA51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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