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Taiwan Semiconductor Corporation P4SMA91A
- Part No.:
- P4SMA91A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA91A.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,770
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Product details
Overview
P4SMA91A 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 77.8 V working stand-off voltage, 86.5–95.5 V breakdown voltage at 1 mA, 125 V maximum clamping voltage at 3.3 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in switching mode power supplies and on-board DC/DC converters.
For engineers reviewing the P4SMA91A datasheet, P4SMA91A pinout, P4SMA91A application, or P4SMA91A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature derating above 25°C, DO-214AC (SMA) package compatibility with automated placement, and leakage current ≤1 µA at VWM.
Technical Context
The P4SMA91A operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast response time (<1.0 ps) and stable breakdown characteristics. Its electrical behavior follows ANSI/IEEE C62.35 standards, with clamping defined by the 10/1000 µs double-exponential surge waveform and thermal derating governed by Fig.2 in the datasheet.
It is rated for -55°C to +150°C operating junction temperature, supports 40 A non-repetitive forward surge (8.3 ms half-sine), and maintains <3.5 V forward voltage at 25 A - enabling robust protection in automotive and industrial power rails where transient energy absorption and low-leakage standby operation are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 77.8 V - Maximum continuous reverse voltage before significant leakage; sets upper limit for protected circuit's normal operating voltage. |
| VBR @ IT=1 mA | 86.5–95.5 V - Breakdown threshold range; ensures reliable turn-on during transients while avoiding false triggering. |
| VC @ IPPM=3.3 A | 125 V - Clamped voltage under 10/1000 µs surge; defines worst-case voltage seen by downstream components. |
| PPPM | 400 W - Peak pulse power handling; determines survivability against standardized load dump or ESD-like events. |
| IR @ VWM | ≤1 µA - Reverse leakage at stand-off voltage; minimizes quiescent power loss in battery-backed or low-power systems. |
| TJ max | +150°C - Maximum junction temperature; enables use in high-ambient environments like engine compartments or enclosed power modules. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-die unidirectional configuration. Cathode indicated by molded band on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance reference; completes clamping loop during overvoltage events. |
| Cathode | Protected line connection | Connected to the line being safeguarded (e.g., +12 V rail); conducts avalanche current when VIN exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Response time <1.0 ps | Enables suppression of ultrafast transients (e.g., EFT/burst noise) before sensitive ICs experience overstress. |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive-level load dump and coupled transient immunity without external filtering. |
| Moisture sensitivity level 1 (J-STD-020) | Allows unlimited floor life and standard reflow without baking, simplifying SMT manufacturing flow. |
Applications
| Switching Mode Power Supply (SMPS) | On-Board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifier outputs against switching-induced voltage spikes and cross-talk. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input/output rails to clamp transients below MOSFET VDSS or diode reverse rating. Use Value: Limits peak stress to ≤125 V during 400 W surges, preserving reliability of 150 V-rated power semiconductors. | Use Scenario: Input rail protection in point-of-load (POL) converters powering FPGAs or microcontrollers in industrial PLCs. IC Role / Device Role / Timing Role: Standoff device absorbing ISO 7637-2 Pulse 1 (inductive switch-off) on 24 V or 48 V input bus. Use Value: Maintains <1 µA leakage at 77.8 V, minimizing standby current draw in always-on control subsystems. |
| Lighting Application | Adapters |
Use Scenario: Surge suppression on LED driver input in outdoor streetlight systems exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-line TVS absorbing 10/1000 µs transients up to 400 W without degradation over 100,000 cycles. Use Value: Withstands repeated 3.3 A peak pulses while holding clamping voltage ≤125 V - preventing LED string overvoltage failure. | Use Scenario: Input-stage protection in universal-input AC/DC adapters for consumer electronics. IC Role / Device Role / Timing Role: Unidirectional suppressor placed after bridge rectifier to protect bulk capacitor and controller ICs. Use Value: Glass-passivated junction ensures stable VBR across production lots, reducing field failure risk due to parameter drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90A (Bourns) | Same DO-214AA (SMB) package; 90 V VWM, 125 V VC @ 3.2 A, 600 W PPPM. | Higher power rating but larger footprint; requires PCB layout change. | Select when higher surge margin is needed and SMB pad layout is available. |
| 1.5SMC91A (ON Semiconductor) | DO-214AB (SMC) package; 77.5 V VWM, 125 V VC @ 3.2 A, 1500 W PPPM. | Three-times higher power rating; incompatible SMA footprint. | Choose for high-energy industrial transients where board space allows SMC mounting. |
Compared with P4SMA91A, SMBJ90A offers higher peak power but requires package redesign, while 1.5SMC91A delivers superior energy handling in a larger SMC outline - making P4SMA91A optimal for space-constrained, cost-sensitive 400 W-class protection where DO-214AC (SMA) is standardized.
Availability
P4SMA91A is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply, J-STD-020 Level 1 moisture handling, and ISO 7637-2 compliance.
Supply support for P4SMA91A 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 industrial, automotive, and consumer markets.
The P4SMA91A belongs to TSC's P4SMAx series of surface-mount TVS diodes engineered for high-reliability transient suppression in compact power conversion and automotive electronics - emphasizing low leakage, precise VBR, and AEC-Q200-aligned robustness.
FAQ
What is the maximum clamping voltage of the P4SMA91A under standard test conditions?
The P4SMA91A has a maximum clamping voltage (VC) of 125 V when subjected to a 10/1000 µs surge waveform at its rated peak pulse current of 3.3 A. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events. The P4SMA91A maintains this clamping performance across its full operating temperature range (-55°C to +150°C), with minimal derating required up to 80°C ambient.
Is the P4SMA91A suitable for bidirectional transient protection?
No, the P4SMA91A is a unidirectional TVS diode intended for DC line protection with polarity-sensitive placement (cathode toward the protected line). For bidirectional applications, TSC specifies the P4SMA91CA variant - which uses a center-tapped dual-die configuration. Using P4SMA91A in AC or floating-bus scenarios risks forward conduction during negative excursions and invalidates ISO 7637-2 Pulse 2b/3b compliance.
What is the reverse leakage current specification for the P4SMA91A at its working stand-off voltage?
The P4SMA91A exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its rated working stand-off voltage of 77.8 V and tested at 25°C. This low leakage supports energy-efficient designs, especially in battery-powered or always-on systems where standby current must remain below microampere thresholds. Leakage remains ≤5 µA up to +125°C junction temperature per thermal derating curves.
Does the P4SMA91A meet automotive transient immunity standards?
Yes, the P4SMA91A is explicitly validated to meet ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b - covering load dump, supply interruption, and coupled transient events common in 12 V and 24 V automotive electrical systems. Its 400 W peak pulse rating, fast <1.0 ps response, and glass-passivated junction ensure consistent performance across temperature and lifetime, though system-level validation per ISO 16750-2 remains the designer's responsibility.
What packaging and reel quantity is offered for the P4SMA91A?
The P4SMA91A is supplied in DO-214AC (SMA) package format on 7,500-unit tape-and-reel carriers, optimized for high-speed pick-and-place assembly. The reel complies with EIA-481-D standards, and each unit features laser-marked "CVJ" identification code plus green compound and date-code marking per TSC's S2102 revision. Moisture sensitivity level is rated J-STD-020 Level 1, permitting indefinite floor life without dry-pack or baking.
P4SMA91A 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):
- 77.8V
- Voltage - Breakdown (Min):
- 86.5V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- 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)
P4SMA91A FAQ
1.How can I place an order for P4SMA91A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA91A 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 P4SMA91A reliable?
The price and inventory of P4SMA91A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA91A is usually 5 days.
3.What payment methods are accepted for P4SMA91A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA91A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA91A?
P4SMA91A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA91A 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 P4SMA91A?
For technical support, including P4SMA91A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA91A requirements.
6.How does Aetrix verify that P4SMA91A is sourced from the original manufacturer or authorized distributors?
All P4SMA91A 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 P4SMA91A meets industry standards.
7.What is the process for return or replacement of P4SMA91A?
All P4SMA91A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA91A, 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 P4SMA91A part is unused and in its original packaging.
Return procedure for P4SMA91A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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