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Taiwan Semiconductor Corporation P4SMA91
- Part No.:
- P4SMA91
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA91.pdf
- Description:
- 400W, 91V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,202
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Product details
Overview
P4SMA91 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for primary overvoltage protection in DC power rails. It features a 73.7 V working stand-off voltage (VWM), 81.9–100 V breakdown voltage (VBR) at 1 mA, 131 V maximum clamping voltage (VC) under 3.2 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the P4SMA91 datasheet, P4SMA91 pinout, P4SMA91 application, or P4SMA91 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 suitability for automotive and industrial DC/DC converter input protection where fast response (<1 ps) and UL 94V-0 molding are required.
Technical Context
The P4SMA91 operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve stable reverse breakdown and low leakage. 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 (Fig.2).
It is rated for -55°C to +150°C operating junction temperature, supports 40 A non-repetitive forward surge (IFSM), and exhibits a 0.106 %/°C temperature coefficient of VBR - enabling predictable voltage shift across temperature in high-reliability power supply designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 73.7 V - Maximum continuous reverse voltage before significant leakage; defines safe operating DC rail margin |
| VBR min/max | 81.9–100 V @ 1 mA - Confirmed avalanche onset range; ensures consistent triggering across production lots |
| VC @ IPPM | 131 V @ 3.2 A (10/1000 µs) - Peak clamped voltage seen by protected circuit during worst-case surge |
| PPPM | 400 W - Surge energy handling capacity per single transient event without degradation |
| IR @ VWM | <1 µA - Negligible standby power loss and minimal impact on high-impedance sensing nodes |
| TJ max | +150 °C - Enables use in thermally constrained environments such as enclosed power adapters |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., +12 V rail); conducts when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures long-term stability of VBR and low IR drift under thermal cycling and humidity stress |
| Fast response time | <1.0 ps - Limits voltage overshoot before clamping engages, critical for protecting fast-switching MOSFETs |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - meets automotive ECU input requirements |
| UL 94V-0 molding | Flame-retardant encapsulation suitable for safety-critical power supplies and lighting systems |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver power inputs against load-dump transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between fused battery rail and local LDO input to clamp surges before they reach sensitive logic. Use Value: Clamps to ≤131 V during ISO 7637-2 Pulse 1 (−120 V, 50 ms), preventing latch-up or permanent damage to downstream regulators. | Use Scenario: Shields isolated flyback controller ICs and optocoupler bias rails from switching noise and cross-talk in factory automation power modules. IC Role / Device Role / Timing Role: Primary-side TVS on main DC bus input, positioned upstream of bulk capacitor to absorb repetitive 400 W pulses without derating. Use Value: Maintains <1 µA leakage at 73.7 V, avoiding unnecessary quiescent current draw in always-on industrial control units. |
| LED Driver Power Supply | Medical Equipment Auxiliary Rail |
Use Scenario: Safeguards constant-current LED driver ICs from inductive kickback generated by magnetic dimming circuits and relay switching. IC Role / Device Role / Timing Role: Unidirectional suppression on HV DC link (e.g., 72 V bus), oriented to block reverse surges while permitting normal forward operation. Use Value: Withstands 40 A IFSM peak forward surge, accommodating brief inrush events during cold-start without bond-wire fusing. | Use Scenario: Provides secondary-side overvoltage protection on isolated 24 V auxiliary rails powering sensor interfaces and display controllers. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after isolation barrier to limit fault propagation from primary-side failures. Use Value: Operating junction range of −55°C to +150°C supports reliable function in sterilizable enclosures with wide ambient swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90A (Bourns) | Bidirectional; 90 V VWM; 100 V VBR min; DO-214AA (SMB) package; 600 W PPPM | Supports AC-coupled or dual-polarity rails; higher power rating but larger footprint | Select when bidirectional protection or higher surge margin is needed; not drop-in due to SMB vs SMA pad layout |
| 1.5SMC91A (ON Semiconductor) | Same unidirectional function; 91 V VBR nominal; DO-214AB (SMC) package; 1500 W PPPM | Designed for higher-energy transients; requires larger PCB area and different thermal relief | Choose for legacy SMC-compatible designs or where >400 W surge immunity is mandated; incompatible pin-to-pin |
Compared with SMBJ90A and 1.5SMC91A, the P4SMA91 offers optimized space efficiency in DO-214AC (SMA), precise 73.7 V standoff for 80 V-class systems, and verified ISO 7637-2 compliance - making it ideal for compact automotive and industrial DC/DC front-end protection where board area and standardization are critical.
Availability
P4SMA91 is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, LED driver power supplies, and medical auxiliary rail protection requiring stable component supply and full traceability.
Supply support for P4SMA91 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 protection devices since 1979.
The P4SMA91 belongs to TSC's P4SMAx series of 400 W surface-mount TVS diodes, engineered specifically for robust, cost-effective overvoltage protection in automotive, industrial, and consumer power systems with stringent AEC-Q200 alignment.
FAQ
What is the maximum clamping voltage of the P4SMA91 under standard surge conditions?
The P4SMA91 has a maximum clamping voltage (VC) of 131 V when subjected to a 10/1000 µs surge waveform at its rated peak pulse current of 3.2 A. This value is measured per ANSI/IEEE C62.35 and reflects the highest voltage the protected circuit will experience during a defined transient event. The P4SMA91 maintains this clamping performance consistently across its specified operating temperature range.
Is the P4SMA91 suitable for automotive applications requiring ISO 7637-2 compliance?
Yes, the P4SMA91 is explicitly tested and rated to meet ISO 7637-2 for Pulse 1 (load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). Its 400 W peak pulse power rating, fast <1 ps response, and stable VBR across temperature make it appropriate for protecting ECUs, BCMs, and infotainment power inputs in 12 V vehicle systems. The P4SMA91 data sheet confirms this compliance in its FEATURES section.
What is the polarity configuration of the P4SMA91, and how is it marked on the device?
The P4SMA91 is a unidirectional TVS diode, with cathode indicated by a distinct band on the DO-214AC (SMA) package body. The anode connects to ground or reference potential, while the cathode connects to the line being protected. This orientation enables suppression only of positive-going transients relative to ground - matching typical DC rail protection topology. The P4SMA91 marking code is "CUJ", printed adjacent to the cathode band.
Does the P4SMA91 have a specified junction capacitance, and is it suitable for high-frequency signal lines?
No, the P4SMA91 does not specify junction capacitance (CJ) in its official datasheet - only VWM, VBR, VC, and PPPM parameters are provided. Its design targets power rail protection, not signal integrity. For high-frequency or data-line applications (e.g., USB, CAN, Ethernet), lower-capacitance TVS devices such as the PUSB3FR or ESD9X series are recommended instead of the P4SMA91.
What is the maximum operating junction temperature and storage temperature range for the P4SMA91?
The P4SMA91 has a maximum operating junction temperature (TJ) of +150°C and a storage temperature range (TSTG) of −55°C to +150°C. These ratings are confirmed in the Absolute Maximum Ratings table and support use in thermally demanding environments such as enclosed power adapters, engine bay electronics, and industrial motor drives. Derating of peak pulse power begins above TA = 25°C per the published pulse derating curve (Fig.2) in the P4SMA91 datasheet.
P4SMA91 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):
- 73.7V
- Voltage - Breakdown (Min):
- 81.9V
- Voltage - Clamping (Max) @ Ipp:
- 131V
- Current - Peak Pulse (10/1000µs):
- 3.2A
- 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)
P4SMA91 FAQ
1.How can I place an order for P4SMA91 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA91 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 P4SMA91 reliable?
The price and inventory of P4SMA91 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA91 is usually 5 days.
3.What payment methods are accepted for P4SMA91?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA91 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA91?
P4SMA91 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA91 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 P4SMA91?
For technical support, including P4SMA91 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA91 requirements.
6.How does Aetrix verify that P4SMA91 is sourced from the original manufacturer or authorized distributors?
All P4SMA91 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 P4SMA91 meets industry standards.
7.What is the process for return or replacement of P4SMA91?
All P4SMA91 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA91, 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 P4SMA91 part is unused and in its original packaging.
Return procedure for P4SMA91:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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