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Taiwan Semiconductor Corporation P4SMA51CH
- Part No.:
- P4SMA51CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA51CH.pdf
- Description:
- 400W, 51V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:5,605
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Product details
Overview
P4SMA51CH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power, 51V breakdown voltage (min 45.9V, max 56.1V), 41.3V working stand-off voltage, and clamps to 73.5V at 5.7A (10/1000μs waveform). It protects DC/DC converters and automotive power rails against ESD and load dump transients.
For engineers reviewing the P4SMA51CH datasheet, P4SMA51CH pinout, P4SMA51CH application, or P4SMA51CH equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, <1.0ps response time, and 1μA max reverse leakage at VWM - critical for low-power, high-reliability automotive and industrial power interfaces.
Technical Context
The P4SMA51CH uses a glass-passivated silicon junction optimized for fast transient suppression in automotive-grade applications. Its unidirectional configuration provides asymmetric clamping: forward conduction at ≤3.5V (25A), reverse clamping at 73.5V (5.7A), with thermal derating above 25°C per Fig.2 and non-repetitive surge capability up to 40A (8.3ms half-sine).
Designed for automated SMT placement, it meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1. Polarity is marked by cathode band; terminals are matte tin-plated and solderable per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1mA | 45.9–56.1V: Ensures reliable turn-on before system overvoltage damage occurs in 48V automotive or industrial rails. |
| VWM | 41.3V: Maximum continuous reverse voltage without significant leakage; sets safe operating margin below VBR. |
| VC @ IPPM=5.7A | 73.5V: Clamped voltage during 10/1000μs surge; defines protected circuit's maximum transient exposure level. |
| PPPM | 400W: Peak pulse power handling capacity under standardized waveform; supports robust protection in SMPS and DC/DC converters. |
| IR @ VWM | <1μA: Ultra-low reverse leakage preserves efficiency in battery-backed or low-quiescent-current systems. |
| TJ Range | −55°C to +150°C: Enables operation in under-hood automotive environments and industrial enclosures without thermal derating penalties. |
Pinout & Package
DO-214AC (SMA) surface-mount package: 2-terminal, single-die unidirectional TVS diode with cathode band marking. Dimensions conform to JEDEC DO-214AC standard; weight ≈0.060g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side of protected line; enables low-VF (≤3.5V @ 25A) clamping during positive surges. |
| Cathode | Clamping node / Surge current sink | Marked by band; ties to higher-potential rail (e.g., 48V bus); conducts surge current to ground during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - ensures reliability in engine control, body electronics, and ADAS power domains. |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives, critical for high-humidity under-hood deployment. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - covers full automotive transient immunity scope. |
| Fast response time | <1.0ps junction response enables clamping before sensitive downstream ICs experience overstress - essential for protecting CAN/LIN transceivers and microcontrollers. |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 48V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC/DC input, absorbing >400W surges within nanoseconds. Use Value: Prevents MOSFET gate oxide rupture and regulator latch-up by limiting transient voltage to ≤73.5V while maintaining <1μA leakage at 41.3V nominal. | Use Scenario: Safeguarding isolated flyback or buck converter inputs in factory automation controllers exposed to relay-induced spikes. IC Role / Device Role / Timing Role: Primary-side surge suppression device mounted directly at DC input connector, shunting energy before EMI filter and controller IC. Use Value: Enables compliance with IEC 61000-4-5 Level 3 (2kV line-earth) without increasing board area - DO-214AC footprint fits tight layout constraints. |
| LED Driver Overvoltage Clamp | Telecom Power Interface |
Use Scenario: Securing constant-current LED driver ICs in streetlight modules against lightning-induced surges on 24–48V supply lines. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of driver IC's VIN pin, conducting only during transients >41.3V. Use Value: Eliminates need for series resistors or RC snubbers by providing sub-1ns response and 73.5V clamping - preserves driver efficiency and thermal budget. | Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras) from induced surges on 48V DC input derived from midspan injectors. IC Role / Device Role / Timing Role: Unidirectional transient suppressor on primary DC input, coordinated with secondary-side TVS for full-system surge immunity. Use Value: Supports EN 61000-4-4 (EFT) and IEC 61000-4-5 (surge) compliance with single-device solution - avoids cascaded clamping delays. |
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 | DO-214AA (SMB) package; 600W rating; slightly higher VC = 82.4V @ 6.1A; same VWM = 41.3V. | Larger footprint; better suited for higher-energy surges but requires PCB rework for DO-214AC-to-DO-214AA transition. | Select when 600W pulse power margin is required and board space allows SMB package. |
| 1.5SMC51A | DO-214AB (SMC) package; 1500W rating; VC = 83.3V @ 18A; VWM = 43.6V - 2.3V higher than P4SMA51CH. | Substantially larger size and thermal mass; intended for main AC/DC input stages, not point-of-load protection. | Choose only for front-end surge protection where 1500W capability justifies increased cost and area. |
Compared with SMBJ51A and 1.5SMC51A, the P4SMA51CH offers optimal balance of compact DO-214AC footprint, AEC-Q101 qualification, and precise 41.3V VWM - making it preferred for space-constrained, automotive-grade point-of-load TVS applications where 400W clamping suffices.
Availability
P4SMA51CH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC/DC converter input stages, and LED driver overvoltage clamping requiring stable component supply across production lifecycles.
Supply support for P4SMA51CH 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 for automotive, industrial, and consumer markets.
The P4SMA series belongs to TSC's AEC-Q101-qualified surface-mount TVS portfolio, engineered specifically for robust transient immunity in harsh automotive electrical environments and high-reliability industrial power systems.
FAQ
What is the polarity configuration of the P4SMA51CH?
The P4SMA51CH is a unidirectional TVS diode, with anode and cathode terminals clearly marked by a cathode band on the DO-214AC package. It conducts in forward bias (≤3.5V @ 25A) and clamps reverse transients above 45.9V. This configuration is ideal for DC rail protection where polarity is fixed, unlike bidirectional variants like P4SMA51C.
Does the P4SMA51CH meet automotive qualification standards?
Yes, the P4SMA51CH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. Its glass-passivated junction, −55°C to +150°C operating range, and JESD201 Class 2 whisker resistance confirm suitability for under-hood automotive applications such as body control modules and ADAS power supplies.
What is the clamping voltage of the P4SMA51CH under standard surge conditions?
The P4SMA51CH clamps to a maximum of 73.5V at 5.7A under the 10/1000μs double-exponential surge waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
How does the P4SMA51CH compare to the P4SMA51AH variant?
The P4SMA51CH has a breakdown voltage range of 45.9–56.1V and VWM = 41.3V, while the P4SMA51AH specifies 48.5–53.6V VBR and VWM = 43.6V. The 'H' suffix denotes standard tolerance; 'AH' indicates tighter VBR spread. Both share identical package, power rating, and AEC-Q101 qualification - select P4SMA51CH for general-purpose 48V rail protection where wider VBR tolerance is acceptable.
Is the P4SMA51CH RoHS and halogen-free compliant?
Yes, the P4SMA51CH is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and terminals are matte tin-plated per J-STD-002 for lead-free solder compatibility - satisfying environmental and assembly requirements for global automotive and industrial manufacturing.
P4SMA51CH 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:
- -
- Bidirectional Channels:
- 1
- 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)
P4SMA51CH FAQ
1.How can I place an order for P4SMA51CH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA51CH 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 P4SMA51CH reliable?
The price and inventory of P4SMA51CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA51CH is usually 5 days.
3.What payment methods are accepted for P4SMA51CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA51CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA51CH?
P4SMA51CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA51CH 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 P4SMA51CH?
For technical support, including P4SMA51CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA51CH requirements.
6.How does Aetrix verify that P4SMA51CH is sourced from the original manufacturer or authorized distributors?
All P4SMA51CH 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 P4SMA51CH meets industry standards.
7.What is the process for return or replacement of P4SMA51CH?
All P4SMA51CH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA51CH, 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 P4SMA51CH part is unused and in its original packaging.
Return procedure for P4SMA51CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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