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Taiwan Semiconductor Corporation P4SMA51H
- Part No.:
- P4SMA51H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA51H.pdf
- Description:
- 400W, 51V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,022
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Product details
Overview
P4SMA51H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It delivers 400W peak pulse power handling, 41.3V working stand-off voltage, 45.9–56.1V breakdown voltage at 1mA test current, and clamps transients to ≤73.5V at 5.7A (10/1000μs waveform), making it suitable for automotive-grade DC/DC converter input protection.
For engineers reviewing the P4SMA51H datasheet, P4SMA51H pinout, P4SMA51H application, or P4SMA51H equivalent, key selection criteria include its AEC-Q101 qualification, DO-214AC (SMA) package compatibility with automated placement, sub-1ps response time, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive transient immunity validation.
Technical Context
The P4SMA51H operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve stable reverse-biased clamping under fast-rising transients. Its 150°C maximum junction temperature and -55°C to +150°C operating range support under-hood and industrial ambient conditions.
It meets ISO 7637-2 requirements for automotive electrical disturbances, including load dump suppression (Pulse 2b), supply interruption (Pulse 3a/3b), and coupled transient immunity (Pulse 1/2a). The device exhibits <1μA reverse leakage at 41.3V and a 0.102%/°C VBR temperature coefficient, ensuring predictable voltage drift across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 41.3 V - Maximum continuous reverse operating voltage before significant leakage; sets safe DC rail margin for 48V systems. |
| VBR @ IT=1mA | 45.9–56.1 V - Breakdown voltage range defining turn-on threshold; ensures reliable clamping onset above normal operating voltage. |
| VC @ IPPM=5.7A | 73.5 V - Clamped voltage during 400W 10/1000μs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 400 W - Peak pulse power rating per 10/1000μs waveform; defines single-event surge energy absorption capability. |
| IR @ VWM | <1 μA - Reverse leakage at stand-off voltage; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| Response time | <1.0 ps - Avalanche response speed; enables effective suppression of ESD and fast-switching noise before downstream IC damage occurs. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in engine control units and industrial motor drives without thermal derating. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, unidirectional configuration with cathode band marking. Matte tin-plated leads comply with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / low-side reference | Connected to system ground or lower-potential rail; forms clamping path when cathode is at higher potential. |
| Cathode | Transient clamp node / protected line connection | Connected to the line being protected (e.g., 48V input); conducts avalanche current to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress-test requirements including temperature cycling, HTRB, and ESD; enables use in ADAS and powertrain modules. |
| Glass passivated junction | Provides stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress without parameter drift. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load disconnect), Pulse 2a (battery line interruption), Pulse 2b (load dump), and Pulses 3a/3b (capacitive coupling) for full automotive EMC robustness. |
| Moisture sensitivity level 1 | Allows unlimited floor life before reflow; eliminates baking requirement and simplifies SMT assembly in high-volume production. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS directives; supports green manufacturing and end-of-life recycling requirements. |
Applications
| Automotive On-Board DC/DC Converters | Industrial SMPS Input Protection |
|---|---|
Use Scenario: Protecting 48V-to-12V buck converter inputs against load dump and battery reversal transients in vehicle body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between input rail and chassis ground, activated within <1ps to limit voltage excursion during ISO 7637-2 Pulse 2b events. Use Value: Limits peak voltage to ≤73.5V, preventing damage to upstream MOSFETs and controller ICs rated for 80V absolute maximum. | Use Scenario: Safeguarding AC-DC adapter secondary-side outputs against back-EMF and switching spikes in factory automation PLC power supplies. IC Role / Device Role / Timing Role: Standoff-clamp protector on regulated 24V output rail, absorbing repetitive 400W surges without degradation due to glass-passivated junction stability. Use Value: Maintains <1μA leakage at 41.3V, avoiding regulation error in precision feedback loops while delivering fail-safe transient suppression. |
| LED Driver Power Inputs | Telecom DC Power Feeds |
Use Scenario: Shielding constant-current LED driver ICs from inductive kickback generated by magnetic dimming circuits in streetlight systems. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp connected across driver input capacitor, conducting only during positive transients exceeding 45.9V. Use Value: Clamps 10/1000μs surges to 73.5V with no recovery delay, preserving LED string integrity and eliminating flicker caused by transient-induced reset. | Use Scenario: Protecting PoE-powered remote radio units from lightning-induced surges on 48V DC feed lines in outdoor base station cabinets. IC Role / Device Role / Timing Role: Primary-level TVS on DC input stage, coordinated with upstream GDT and downstream TVS arrays to distribute 6kV surge energy per IEC 61000-4-5. Use Value: Provides 400W single-pulse rating and 0.102%/°C VBR stability, enabling predictable coordination with secondary-stage protectors across -40°C to +85°C operating range. |
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 | 600W rating, DO-214AA package, 51V nominal VBR, bidirectional variant standard; unidirectional version requires 'A' suffix. | Higher power headroom but larger footprint; better suited for non-automotive industrial surge environments with less stringent space constraints. | Select SMBJ51A when >400W single-event margin is required and DO-214AA board area is available. |
| 1.5SMC51A | 1500W rating, DO-214AB package, same 51V VBR range, higher IPPM (31.4A), larger thermal mass. | Designed for higher-energy transients (e.g., IEC 61000-4-5 Level 4); not AEC-Q101 qualified; unsuitable for automotive under-hood use. | Choose 1.5SMC51A for telecom or industrial mains-connected equipment requiring higher surge immunity without automotive qualification. |
Compared with SMBJ51A and 1.5SMC51A, the P4SMA51H offers optimal balance of AEC-Q101 compliance, DO-214AC compactness, and precise 400W/73.5V clamping-making it the preferred choice for space-constrained automotive DC/DC converters where qualification and footprint are critical.
Availability
P4SMA51H is available at Aetrix Electronics and suitable for automotive on-board DC/DC converters, industrial SMPS input protection, and LED driver power inputs requiring stable component supply, AEC-Q101 traceability, and DO-214AC tape-and-reel packaging.
Supply support for P4SMA51H 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, and power MOSFETs for automotive and industrial markets.
The P4SMA series belongs to TSC's AEC-Q101-qualified surface-mount TVS portfolio, engineered specifically for automotive power rail protection with emphasis on ISO 7637-2 compliance, high-temperature reliability, and automated assembly compatibility.
FAQ
What is the maximum clamping voltage of the P4SMA51H under a 10/1000μs surge?
The P4SMA51H has a maximum clamping voltage (VC) of 73.5 V when subjected to its rated peak pulse current of 5.7 A using the standardized 10/1000μs waveform. This value is measured at TA = 25°C and defines the upper voltage limit imposed on the protected circuit during transient events. The P4SMA51H maintains this clamping performance consistently due to its glass-passivated junction and AEC-Q101-validated construction.
Is the P4SMA51H suitable for bidirectional transient protection?
No, the P4SMA51H is a unidirectional TVS diode intended for protection of DC power rails with defined polarity. For bidirectional applications-such as AC signal lines or differential buses-Taiwan Semiconductor specifies variants with "CH" or "CAH" suffixes (e.g., P4SMA51CH). Using the P4SMA51H in reverse-biased configurations may result in premature failure or undefined clamping behavior.
Does the P4SMA51H meet automotive qualification standards?
Yes, the P4SMA51H is explicitly AEC-Q101 qualified and tested per the full stress-test schedule including HTGB, H3TRB, temperature cycling, and ESD. It also complies with ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b, confirming its suitability for automotive power network protection in ECUs, body controllers, and ADAS modules.
What is the moisture sensitivity level (MSL) of the P4SMA51H?
The P4SMA51H has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30°C/60% RH and requires no baking prior to reflow soldering. This simplifies SMT assembly logistics and eliminates yield risk from popcorning during lead-free reflow profiles.
How does the P4SMA51H compare to the P4SMA51AH variant?
The P4SMA51AH features a tighter breakdown voltage tolerance (48.5–53.6 V vs. 45.9–56.1 V for P4SMA51H) and slightly higher working stand-off voltage (43.6 V vs. 41.3 V), enabling improved margin in precision 48V systems. Both share identical package (DO-214AC), power rating (400W), clamping voltage (70.1 V for P4SMA51AH), and AEC-Q101 qualification. The P4SMA51H remains preferred where cost-sensitive designs accept wider VBR spread.
P4SMA51H 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA51H FAQ
1.How can I place an order for P4SMA51H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA51H 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 P4SMA51H reliable?
The price and inventory of P4SMA51H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA51H is usually 5 days.
3.What payment methods are accepted for P4SMA51H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA51H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA51H?
P4SMA51H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA51H 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 P4SMA51H?
For technical support, including P4SMA51H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA51H requirements.
6.How does Aetrix verify that P4SMA51H is sourced from the original manufacturer or authorized distributors?
All P4SMA51H 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 P4SMA51H meets industry standards.
7.What is the process for return or replacement of P4SMA51H?
All P4SMA51H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA51H, 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 P4SMA51H part is unused and in its original packaging.
Return procedure for P4SMA51H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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