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Vishay General Semiconductor - Diodes Division P4SMA91AHM3_A/H
- Part No.:
- P4SMA91AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA91AHM3_A/H.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P4SMA91AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, rated for 91 V breakdown voltage (VBR = 86.5–95.5 V at IT = 1.0 mA), 125 V maximum clamping voltage (VC) at 3.2 A peak pulse current, and 400 W peak pulse power (10/1000 µs waveform). It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and lightning surges in industrial and automotive electronics.
For engineers reviewing the P4SMA91AHM3_A/H datasheet, P4SMA91AHM3_A/H pinout, P4SMA91AHM3_A/H application, or P4SMA91AHM3_A/H equivalent, key selection criteria include clamping voltage margin relative to protected circuit's absolute maximum rating, thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification status, unidirectional polarity marking, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 77.8 V stand-off voltage), then rapidly avalanches below 125 V to divert surge energy away from downstream components. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance.
Designed for transient suppression only-not for continuous regulation-the P4SMA91AHM3_A/H sustains 3.3 W steady-state power dissipation at 50 °C ambient, with junction temperature limited to 150 °C. It meets MSL Level 1 per J-STD-020 and supports reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VBR | 86.5–95.5 V at 1.0 mA test current - defines precise avalanche onset threshold for reliable overvoltage triggering |
| Stand-off Voltage VWM | 77.8 V - maximum continuous reverse working voltage before leakage exceeds 1.0 µA |
| Maximum Clamping Voltage VC | 125 V at 3.2 A peak pulse - limits voltage seen by protected IC during 10/1000 µs surge |
| Peak Pulse Power PPPM | 400 W (10/1000 µs) - energy-handling capacity for single transient events; derated above 25 °C ambient |
| Junction-to-Ambient Thermal Resistance | 120 °C/W - determines temperature rise under sustained power; requires minimum 5.0 mm × 5.0 mm copper pad per terminal |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with cathode band marking and matte tin-plated leads |
Pinout & Package
SMA (DO-214AC) package: molded epoxy case with two terminals, cathode marked by a band on the body. Terminals are matte tin-plated and solderable per J-STD-002 and JESD 22-B102. Meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in unidirectional configuration | Connected to ground or common return path; carries full surge current during clamping |
| Cathode | High-side connection; marked with band | Connected to protected line (e.g., power rail or signal); avalanche initiates here during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables protection of 24 V and 48 V industrial buses against IEC 61000-4-5 Level 3 surges without external series impedance |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics where field failure risk must be minimized |
| Glass passivated junction | Ensures long-term VBR stability and low parameter drift across 150 °C operating range |
| MSL Level 1 moisture sensitivity | Allows direct placement into reflow without baking; compatible with standard SMT assembly lines |
| Low profile SMA package | Reduces board space vs. DO-214AA/AB; supports high-density layouts in compact sensor modules |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O pins from flyback voltage spikes generated by relay and solenoid coil de-energization. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between power rail and ground, responding within <1 ns to limit transient overshoot. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic interfaces while maintaining system uptime in factory automation equipment. |
Use Scenario: Safeguarding LIN bus transceivers and door module sensors against load dump and jump-start induced transients. IC Role / Device Role / Timing Role: Standoff-rated TVS connected directly across supply input, clamping to 125 V before vehicle electronics exceed ABSOLUTE MAX ratings. Use Value: Enables compliance with ISO 7637-2 Pulse 1/2a/5a test requirements without additional filtering components. |
| Telecom Power Supply Inputs | Consumer Appliance Control Boards |
Use Scenario: Input-stage surge protection for AC/DC adapters and PoE-powered devices exposed to lightning-induced surges on Ethernet or AC mains lines. IC Role / Device Role / Timing Role: Primary-level TVS placed upstream of DC-DC converters, absorbing up to 400 W for ≤1 ms. Use Value: Eliminates need for multi-stage protection schemes-reduces BOM count and PCB area in space-constrained telecom infrastructure. |
Use Scenario: Overvoltage safeguard for microcontroller reset lines and front-panel button inputs in washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA at 77.8 V) unidirectional suppressor ensuring no false resets during normal operation. Use Value: Maintains functional safety integrity while meeting IEC 61000-4-2 ESD immunity (±8 kV contact) and IEC 61000-4-4 EFT requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90A | VBR = 90–100 V; VC = 129 V at 3.1 A; same SMA package but not AEC-Q101 qualified | Lacks automotive qualification; suitable for commercial/industrial use only | Select when AEC-Q101 is not required and tighter VBR tolerance is acceptable |
| 1.5SMC91A | Higher PPPM = 1500 W; larger SMC (DO-214AB) package; VC = 125 V at 12 A | Requires more PCB area; better for high-energy surges but over-specified for typical 400 W needs | Choose only if system-level testing shows insufficient margin with 400 W rating |
Compared with SMAJ90A, the P4SMA91AHM3_A/H provides automotive-grade reliability without sacrificing clamping performance; compared with 1.5SMC91A, it delivers identical clamping voltage in a 40% smaller footprint-critical for dense control board layouts.
Availability
P4SMA91AHM3_A/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power supply inputs, and consumer appliance control boards requiring stable component supply, AEC-Q101 validation, and consistent TVS performance across production batches.
Supply support for P4SMA91AHM3_A/H 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
Vishay General Semiconductor designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, automotive-qualified, and industry-standard packages.
The P4SMA91AHM3_A/H belongs to the P4SMA series of surface-mount TRANSZORB® TVS diodes, engineered specifically for cost-effective, high-volume transient protection in automotive, industrial, and telecom systems where space, reliability, and surge immunity are critical.
FAQ
What is the maximum clamping voltage of the P4SMA91AHM3_A/H under surge conditions?
The P4SMA91AHM3_A/H has a maximum clamping voltage (VC) of 125 V at 3.2 A peak pulse current using the standardized 10/1000 µs waveform. This value is measured per Figure 1 in the Vishay datasheet 88367 and represents the upper voltage limit imposed on protected circuits during transient events. The P4SMA91AHM3_A/H maintains this clamping performance across its qualified operating temperature range.
Is the P4SMA91AHM3_A/H suitable for automotive applications?
Yes, the P4SMA91AHM3_A/H is AEC-Q101 qualified, as indicated by the "HM3" suffix and confirmed in the Vishay ordering information table (Document 88367, page 3). It undergoes stress testing for temperature cycling, high-temperature reverse bias, and mechanical shock, making it appropriate for under-hood and body electronics. The P4SMA91AHM3_A/H is explicitly listed for automotive use in Vishay's mechanical data section.
What does the "_A/H" suffix mean in P4SMA91AHM3_A/H?
The "_A/H" suffix in P4SMA91AHM3_A/H denotes revision level "A" and packaging format "H" (7-inch diameter plastic tape and reel, 1800 units per reel), per Vishay's ordering information table on page 3 of document 88367. The "HM3" portion confirms halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. The P4SMA91AHM3_A/H is therefore a fully specified, production-ready variant with traceable manufacturing controls.
How does the P4SMA91AHM3_A/H compare to bidirectional TVS diodes like P4SMA91CA?
The P4SMA91AHM3_A/H is unidirectional and features a cathode band marking, whereas P4SMA91CA is bidirectional with no polarity marking and symmetric clamping in both directions. The P4SMA91AHM3_A/H offers lower leakage (<1 µA at 77.8 V) and is intended for DC-biased lines like power rails; P4SMA91CA suits AC-coupled or differential signal paths. Their VBR and VC values differ slightly due to structural asymmetry.
What PCB layout guidance applies to the P4SMA91AHM3_A/H for optimal thermal performance?
Vishay specifies that the P4SMA91AHM3_A/H must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W pulse power and maintain RθJA = 120 °C/W. Traces should be short and wide to minimize inductance; avoid thermal relief on pads. The P4SMA91AHM3_A/H datasheet Figure 4 and thermal characteristics table confirm this requirement for reliable junction temperature control during surge events.
P4SMA91AHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA, TransZorb®
- 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):
- 3.2A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA91AHM3_A/H FAQ
1.How can I place an order for P4SMA91AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA91AHM3_A/H 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 P4SMA91AHM3_A/H reliable?
The price and inventory of P4SMA91AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA91AHM3_A/H is usually 5 days.
3.What payment methods are accepted for P4SMA91AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA91AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA91AHM3_A/H?
P4SMA91AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA91AHM3_A/H 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 P4SMA91AHM3_A/H?
For technical support, including P4SMA91AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA91AHM3_A/H requirements.
6.How does Aetrix verify that P4SMA91AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All P4SMA91AHM3_A/H 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 P4SMA91AHM3_A/H meets industry standards.
7.What is the process for return or replacement of P4SMA91AHM3_A/H?
All P4SMA91AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA91AHM3_A/H, 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 P4SMA91AHM3_A/H part is unused and in its original packaging.
Return procedure for P4SMA91AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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