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Vishay General Semiconductor - Diodes Division P4SMA91CAHM3/I
- Part No.:
- P4SMA91CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA91CAHM3/I.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,472
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Product details
Overview
P4SMA91CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in signal and power lines. It features a 91 V breakdown voltage (VBR = 86.5–95.5 V at 1 mA), 77.8 V standoff voltage (VWM), clamps to ≤125 V at 3.2 A peak pulse current, and delivers 400 W peak pulse power (10/1000 µs waveform) - ideal for safeguarding automotive sensor interfaces and industrial I/O circuits against ESD and inductive switching transients.
For engineers reviewing the P4SMA91CAHM3/I datasheet, P4SMA91CAHM3/I pinout, P4SMA91CAHM3/I application, or P4SMA91CAHM3/I equivalent, this page provides verified electrical parameters, AEC-Q101 qualification status, SMA (DO-214AC) package dimensions, clamping performance under standardized surge waveforms, and direct alternatives with documented voltage and power rating differences.
Technical Context
The P4SMA91CAHM3/I operates as a bidirectional avalanche diode, symmetrically clamping transient voltages above ±91 V in both polarities without polarity marking. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at 77.8 V), while its MSL Level 1 rating and 260 °C reflow compatibility support high-reliability automated SMT assembly.
Designed for repetitive surge handling up to 0.01% duty cycle, it sustains 400 W peak pulse power below 91 V and derates to 300 W above 91 V per Vishay's Fig. 2. Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, enabling operation from –65 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 86.5 V / 95.5 V at 1 mA - defines precise voltage threshold where avalanche conduction begins in either direction |
| VWM | 77.8 V - maximum continuous reverse operating voltage before significant leakage occurs |
| VC @ IPPM | ≤125 V at 3.2 A - clamping voltage during 10/1000 µs surge, limiting downstream voltage stress |
| PPPM | 400 W (≤91 V), 300 W (>91 V) - peak transient energy absorption capability under standardized waveform |
| IPPM | 3.2 A - maximum non-repetitive peak pulse current the device safely conducts without failure |
| TJ max. | +150 °C - maximum junction temperature enabling use in under-hood automotive environments |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); cathode band omitted for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Conducts during negative-going surges; forms symmetrical clamp path with cathode |
| Cathode | Transient current entry (positive polarity) | Conducts during positive-going surges; identical electrical role to anode in bidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 400 W peak pulse power (10/1000 µs) | Withstands high-energy transients common in automotive load-dump and industrial relay switching |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive electronics per stress test requirements including HTGB and TCT |
| MSL Level 1, 260 °C peak reflow | Supports lead-free SMT assembly without moisture-related popcorn failure risk |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD >15 kV contact discharge) |
Applications
| Automotive Sensor Interfaces | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or 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: Bidirectional TVS placed across differential or single-ended signal lines upstream of interface ICs. Use Value: Clamps transients to ≤125 V while maintaining <1 µA leakage at 77.8 V, preserving signal integrity and preventing interface IC latch-up. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against inductive kickback from solenoid valves and relays. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on field-side input terminals, shunting surge energy to ground. Use Value: Absorbs 400 W pulses without degradation, enabling reliable operation in harsh factory environments with frequent switching noise. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs from lightning-induced surges on outdoor data lines. IC Role / Device Role / Timing Role: Primary-level protection device mounted at connector entry point, preceding secondary GDT or MOV stages. Use Value: Fast response time and low clamping voltage reduce stress on downstream protection components and extend system MTBF. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Across-motor placement to clamp back-EMF during PWM switching transitions. Use Value: Withstands repetitive 300 W surges at 0.01% duty cycle, preventing MOSFET gate oxide damage and reducing EMI filter burden. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90CA | 600 W PPPM, same VBR range (85.5–94.5 V), SMB package (larger footprint) | Higher surge capacity suits higher-energy industrial environments; requires PCB layout change | Select when 600 W surge margin is required and board space permits SMB footprint |
| 1.5SMC91CA | 1500 W PPPM, same VBR, SMC package (5.3 mm × 4.5 mm) | Used in high-power front-end protection; not suitable for dense automotive PCBs | Choose for primary-level telecom or power supply rail protection where size is secondary to energy handling |
Compared with SMBJ90CA and 1.5SMC91CA, the P4SMA91CAHM3/I offers optimal balance of AEC-Q101 qualification, compact SMA footprint, and 400 W surge rating - making it preferred for space-constrained automotive and industrial edge nodes where reliability and manufacturability are critical.
Availability
P4SMA91CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom line interfaces, and consumer appliance motor drives requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for P4SMA91CAHM3/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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA Series targets cost-sensitive yet high-reliability transient suppression needs in automotive, industrial, and communications systems - delivering AEC-Q101-qualified TVS diodes in compact, reflow-compatible packages.
FAQ
What is the breakdown voltage tolerance for P4SMA91CAHM3/I?
The P4SMA91CAHM3/I has a specified breakdown voltage (VBR) range of 86.5 V to 95.5 V at 1 mA test current, representing ±5% tolerance around the nominal 91 V rating. This tight distribution ensures consistent clamping behavior across production lots and supports predictable circuit protection design without over-engineering margins.
Is P4SMA91CAHM3/I suitable for automotive applications?
Yes, P4SMA91CAHM3/I is AEC-Q101 qualified (denoted by the HM3 suffix), meaning it has passed rigorous automotive reliability tests including high-temperature reverse bias, temperature cycling, and ESD. It is explicitly rated for under-hood and body-control module use where junction temperatures reach +150 °C and surge immunity must meet ISO 7637-2 requirements.
What does the "CA" suffix indicate in P4SMA91CAHM3/I?
The "CA" suffix in P4SMA91CAHM3/I denotes a bidirectional configuration - the device clamps transient voltages symmetrically in both polarities, with no cathode marking. This distinguishes it from unidirectional variants (e.g., P4SMA91AHM3/I) and enables use on AC-coupled, floating, or differential signal lines without polarity alignment concerns.
How does P4SMA91CAHM3/I perform under repeated surge conditions?
P4SMA91CAHM3/I supports repetitive 10/1000 µs surges at a 0.01% duty cycle, delivering 400 W below 91 V and 300 W above 91 V. Its thermal resistance (RθJA = 120 °C/W) and 150 °C max junction temperature allow sustained operation in cyclic industrial environments when mounted on recommended 0.2" × 0.2" copper pads.
What is the maximum clamping voltage of P4SMA91CAHM3/I during a surge event?
The maximum clamping voltage (VC) of P4SMA91CAHM3/I is 125 V at its rated peak pulse current (IPPM = 3.2 A) under the 10/1000 µs waveform. This value represents the upper limit of voltage imposed on protected circuitry during worst-case transient events, directly determining the voltage stress seen by downstream ICs and passive components.
P4SMA91CAHM3/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:
- -
- Bidirectional Channels:
- 1
- 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)
P4SMA91CAHM3/I FAQ
1.How can I place an order for P4SMA91CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA91CAHM3/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 P4SMA91CAHM3/I reliable?
The price and inventory of P4SMA91CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA91CAHM3/I is usually 5 days.
3.What payment methods are accepted for P4SMA91CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA91CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA91CAHM3/I?
P4SMA91CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA91CAHM3/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 P4SMA91CAHM3/I?
For technical support, including P4SMA91CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA91CAHM3/I requirements.
6.How does Aetrix verify that P4SMA91CAHM3/I is sourced from the original manufacturer or authorized distributors?
All P4SMA91CAHM3/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 P4SMA91CAHM3/I meets industry standards.
7.What is the process for return or replacement of P4SMA91CAHM3/I?
All P4SMA91CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA91CAHM3/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 P4SMA91CAHM3/I part is unused and in its original packaging.
Return procedure for P4SMA91CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA91CAHM3/I Tags
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