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Vishay General Semiconductor - Diodes Division P4SMA91AHM3/I
- Part No.:
- P4SMA91AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA91AHM3/I.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,722
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Product details
Overview
P4SMA91AHM3/I 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/I datasheet, P4SMA91AHM3/I pinout, P4SMA91AHM3/I application, or P4SMA91AHM3/I equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), clamping performance under surge, and halogen-free RoHS-compliant construction - all critical for ESD/surge protection design-in and BOM validation.
Technical Context
The P4SMA91AHM3/I operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1 ns) to transient overvoltages and low incremental surge resistance for stable clamping. Its 91 V standoff voltage (VWM = 77.8 V) ensures reliable blocking during normal operation while allowing precise coordination with downstream IC voltage rails.
Designed for surface-mount automated assembly, it meets MSL Level 1 per J-STD-020 (peak reflow 260 °C) and is qualified to AEC-Q101 for automotive applications. The SMA package provides mechanical robustness and thermal dissipation via 0.2" × 0.2" copper pads, supporting 3.3 W steady-state power dissipation at TA = 50 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 86.5 V / 95.5 V at IT = 1.0 mA - defines precise avalanche initiation threshold for predictable clamping onset |
| VWM | 77.8 V - maximum continuous reverse working voltage; sets safe operating margin below VBR |
| VC @ IPPM | 125 V at 3.2 A (10/1000 µs) - peak clamped voltage seen by protected circuit during worst-case surge |
| PPPM | 400 W - peak transient power handling capability; derates to 300 W above 91 V per spec note |
| IFSM | 40 A - single half-sine surge current rating (8.3 ms); supports high-energy inductive load switching events |
| RθJA | 120 °C/W - junction-to-ambient thermal resistance; determines temperature rise under sustained power dissipation |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood or industrial ambient environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VLINE exceeds VBR |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per stress test plan |
| Halogen-free & RoHS-compliant | Meets JEDEC J-STD-609A Class 1 definition; eliminates brominated flame retardants for safer recycling and processing |
| 400 W peak pulse power (10/1000 µs) | Handles high-energy transients without degradation; supports IEC 61000-4-5 Level 4 compliance with proper layout |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage stress on protected ICs - e.g., keeps 3.3 V or 5 V logic within safe absolute maximum ratings |
| MSL Level 1 moisture sensitivity | Zero floor life limitation; no baking required prior to reflow, reducing manufacturing overhead and risk of popcorning |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses in engine control units. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and chassis ground to clamp transients before they reach the transceiver input stage. Use Value: Prevents latch-up or permanent damage to automotive-grade transceivers by limiting voltage to ≤125 V during 400 W surges. |
Use Scenario: Shielding digital input modules in programmable logic controllers from field-wiring induced surges due to relay coil de-energization or motor contactor switching. IC Role / Device Role / Timing Role: Front-end transient suppressor on 24 V DC input channels, coordinated with series impedance and filtering. Use Value: Ensures >100,000 surge cycles without parameter shift, maintaining long-term immunity in factory automation environments. |
| Telecom Power Rail Clamping | Consumer Device USB Port Protection |
Use Scenario: Safeguarding 48 V PoE-powered Ethernet switch ports against lightning-induced common-mode surges on data pairs and power lines. IC Role / Device Role / Timing Role: Paired unidirectional TVS on each conductor relative to ground, providing symmetric clamping for differential and common-mode threats. Use Value: Achieves <1 ns response time and <125 V clamping to preserve PHY IC integrity during 10/1000 µs surges up to 3.2 A. |
Use Scenario: Adding secondary-level surge protection on USB 2.0 VBUS and D+/D− lines in smart home hubs exposed to AC adapter transients and ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ < 100 pF at VWM) placed directly at connector to minimize stub length and preserve signal integrity. Use Value: Maintains USB full-speed timing margins while suppressing ±15 kV contact ESD per IEC 61000-4-2 without signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90A | Same VBR range (85.5–94.5 V), but SMB package (DO-214AA); 600 W PPPM, higher IPPM (6.7 A), RθJA = 85 °C/W | Better thermal performance and higher surge rating; requires larger PCB footprint than SMA | Select when higher surge margin or improved thermal management is needed and board space permits SMB footprint |
| 1.5SMC91A | Same VBR (86.5–95.5 V), SMC package (DO-214AB); 1500 W PPPM, IPPM = 12.3 A, RθJA = 50 °C/W | Higher power handling and lower thermal resistance; suited for primary-level protection in harsh environments | Choose for front-end protection where 1500 W surge capability and superior heat dissipation are mandatory |
Compared with SMBJ90A and 1.5SMC91A, the P4SMA91AHM3/I offers optimal balance of compact SMA footprint, AEC-Q101 qualification, halogen-free compliance, and 400 W surge capability - making it ideal for space-constrained automotive and industrial modules where secondary-level protection suffices.
Availability
P4SMA91AHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom power rail clamping, and consumer USB port protection requiring stable component supply, long-lifecycle support, and certified AEC-Q101 reliability.
Supply support for P4SMA91AHM3/I 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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA Series is designed for robust, surface-mount transient voltage suppression in automotive, industrial, and communications systems - delivering consistent clamping performance, AEC-Q101 qualification, and halogen-free compliance in compact SMA packages.
FAQ
What is the breakdown voltage tolerance for P4SMA91AHM3/I?
The P4SMA91AHM3/I has a specified breakdown voltage range of 86.5 V to 95.5 V at test current IT = 1.0 mA, representing ±5% tolerance around the nominal 91 V rating. This tight VBR distribution ensures consistent clamping behavior across production lots and supports precise coordination with downstream overvoltage protection thresholds in the P4SMA91AHM3/I design.
Is P4SMA91AHM3/I suitable for automotive applications?
Yes, the P4SMA91AHM3/I carries AEC-Q101 qualification (indicated by the "HM3" suffix), confirming compliance with stress tests for temperature cycling, high-temperature reverse bias, and surge endurance required for automotive electronics. Its halogen-free, RoHS-compliant construction and MSL Level 1 rating further support use in engine control units, ADAS sensors, and infotainment systems where P4SMA91AHM3/I reliability is mission-critical.
What is the maximum clamping voltage of P4SMA91AHM3/I under surge conditions?
The P4SMA91AHM3/I exhibits a maximum clamping voltage (VC) of 125 V when subjected to its rated peak pulse current of 3.2 A using the standard 10/1000 µs waveform. This value is measured at the device terminals and represents the highest voltage imposed on the protected circuit during worst-case transient events - a key parameter for ensuring downstream ICs remain within their absolute maximum ratings in P4SMA91AHM3/I implementations.
Does P4SMA91AHM3/I have a bidirectional variant?
No, the P4SMA91AHM3/I is strictly unidirectional, as confirmed by its part number suffix "A" and the absence of "CA" designation. Bidirectional variants exist in the same family (e.g., P4SMA91CA), but they differ in construction, polarity marking, and electrical symmetry. Using P4SMA91AHM3/I in bidirectional configurations would result in improper clamping or failure; always verify polarity and directionality before substituting in P4SMA91AHM3/I designs.
What is the thermal resistance of P4SMA91AHM3/I, and how does it affect layout?
The P4SMA91AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under sustained power dissipation, PCB layout must provide adequate copper area and avoid thermal bottlenecks - especially important in high-ambient environments where P4SMA91AHM3/I may operate near its +150 °C TJ limit.
P4SMA91AHM3/I 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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for P4SMA91AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA91AHM3/I 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/I reliable?
The price and inventory of P4SMA91AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA91AHM3/I is usually 5 days.
3.What payment methods are accepted for P4SMA91AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA91AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA91AHM3/I?
P4SMA91AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA91AHM3/I 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/I?
For technical support, including P4SMA91AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA91AHM3/I requirements.
6.How does Aetrix verify that P4SMA91AHM3/I is sourced from the original manufacturer or authorized distributors?
All P4SMA91AHM3/I 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/I meets industry standards.
7.What is the process for return or replacement of P4SMA91AHM3/I?
All P4SMA91AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA91AHM3/I, 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/I part is unused and in its original packaging.
Return procedure for P4SMA91AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA91AHM3/I Tags
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