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Vishay General Semiconductor - Diodes Division P4SMA9.1AHM3/I
- Part No.:
- P4SMA9.1AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA9.1AHM3/I.pdf
- Description:
- TVS DIODE 7.78VWM 13.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,745
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Product details
Overview
P4SMA9.1AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features 9.1 V breakdown voltage (VBR = 8.65–9.55 V at IT = 1.0 mA), 7.78 V stand-off voltage (VWM), 13.4 V maximum clamping voltage (VC) at 29.9 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the P4SMA9.1AHM3/I datasheet, P4SMA9.1AHM3/I pinout, P4SMA9.1AHM3/I application, or P4SMA9.1AHM3/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), polarity marking (cathode band), and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker test.
Technical Context
The P4SMA9.1AHM3/I operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling fast response (<1 ns) to ESD and inductive switching transients.
Rated for 150 °C maximum junction temperature and MSL Level 1 (260 °C reflow peak), it supports automated SMT placement on 5.0 mm × 5.0 mm copper pads. The device is halogen-free, RoHS-compliant, and AEC-Q101 qualified - confirming suitability for automotive electronics where reliability under thermal cycling and humidity is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 8.65 V / 9.55 V at 1.0 mA - defines precise clamping onset; ±5% tolerance enables predictable overvoltage protection design |
| VWM | 7.78 V - maximum continuous reverse operating voltage before leakage rises; ensures no conduction during normal 5 V or 9 V rail operation |
| VC @ IPPM | 13.4 V at 29.9 A - clamped voltage seen by protected circuit during 400 W transient; limits stress on downstream 12 V-rated ICs |
| IPPM | 29.9 A (10/1000 µs) - peak surge current capability; sufficient to absorb IEC 61000-4-5 Level 3 (1 kV/42 Ω) surges |
| PPPM | 400 W - peak pulse power rating; derates linearly above 25 °C ambient per Fig. 2, supporting 300 W at >91 V devices |
| RθJA | 120 °C/W - junction-to-ambient thermal resistance; requires minimum 5.0 mm × 5.0 mm copper pad per terminal for rated power handling |
| Leakage ID | 50 µA max at VWM - low reverse leakage preserves battery life and avoids false triggering in low-power sensor interfaces |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Polarity indicated by cathode band; unidirectional configuration only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to system ground or lower-potential rail; forms clamping path with cathode during overvoltage events |
| Cathode | Clamping output / Surge current sink | Marked with band; connected to protected line (e.g., 9 V supply or CAN_H); conducts surge current to ground when VREV > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias HAST, and mechanical shock - required for engine control, body electronics, and ADAS sensors |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU Directive 2011/65/EU and JESD201 Class 2 whisker resistance; eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating |
| 400 W peak pulse power (10/1000 µs) | Handles high-energy transients from inductive load switching (e.g., solenoid drivers, relay coils) without degradation across 1000+ surge events |
| Low clamping ratio (VC/VBR ≈ 1.40) | Minimizes overvoltage overshoot during clamping; protects 12 V logic interfaces where VIN absolute max is 13.2 V |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking; supports high-volume automated assembly in Tier-1 automotive manufacturing |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
|
Use Scenario: Protecting 9 V supply rails feeding engine control unit (ECU) microcontrollers and CAN transceivers from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 9 V rail and chassis ground; clamps transients within nanoseconds to prevent latch-up or gate oxide damage. Use Value: With VC = 13.4 V, keeps rail voltage below 13.2 V absolute maximum of automotive-grade MCUs and CAN FD transceivers during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure/temperature sensors in factory automation PLC modules from ESD and field wiring surges. IC Role / Device Role / Timing Role: TVS mounted at connector entry point, shunting transients before signal conditioning op-amps and ADC front-ends. Use Value: 50 µA max leakage at 7.78 V prevents loading of high-impedance sensor outputs; 120 °C/W RθJA allows operation up to +105 °C ambient in enclosed enclosures. |
| Consumer Device USB Port ESD Suppression | Telecom DC Power Input Stage |
|
Use Scenario: Safeguarding USB VBUS lines in portable medical monitors and smart home hubs against contact discharge per IEC 61000-4-2 ±8 kV. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground; placed upstream of USB power switch and load switch ICs. Use Value: Fast <1 ns response time prevents ESD energy from reaching internal PMICs; SMA package footprint fits tight board space near USB Type-C connectors. |
Use Scenario: Protecting -48 V DC telecom power inputs in base station remote radio units (RRUs) from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Used in series with higher-voltage TVS arrays; first-stage clamp limiting voltage rise before secondary protection stages activate. Use Value: 400 W rating supports coordination with downstream 1500 W TVS; halogen-free HM3 construction meets stringent telecom material compliance requirements (GR-1210). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ9.0A-E3/5A | VBR = 9.0–10.0 V (min/max), VWM = 7.75 V, VC = 14.4 V @ 27.6 A, non-AEC-Q101, RoHS-compliant but not halogen-free | Lacks automotive qualification and halogen-free certification; suitable for commercial/industrial use only | Select when AEC-Q101 and halogen-free requirements are absent; identical SMA package and pinout enables drop-in replacement in non-automotive designs |
| 1.5SMC9.0A | Higher power (1500 W), DO-214AB (SMC) package (larger footprint), VBR = 9.0–10.0 V, VC = 14.4 V @ 104 A | Requires PCB layout change due to larger SMC package; suited for higher-energy surge environments (e.g., AC mains input) | Choose when surge threat level exceeds 400 W (e.g., outdoor telecom equipment); not pin-compatible - redesign of pad layout and stencil required |
Compared with SMAJ9.0A-E3/5A, P4SMA9.1AHM3/I adds AEC-Q101 qualification and halogen-free compliance for automotive use; compared with 1.5SMC9.0A, it trades peak power for compact SMA footprint and lower thermal mass - optimizing for space-constrained, thermally managed PCBs in ECUs and sensor nodes.
Availability
P4SMA9.1AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor modules, and telecom power input stages requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for P4SMA9.1AHM3/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 performance.
The P4SMA Series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 validation, low clamping voltage, and consistent surge endurance are mandatory.
FAQ
What is the exact breakdown voltage range for P4SMA9.1AHM3/I?
The P4SMA9.1AHM3/I has a guaranteed breakdown voltage (VBR) range of 8.65 V to 9.55 V measured at 1.0 mA test current (IT). This ±5% tolerance is confirmed in the Vishay P4SMA datasheet revision 09-Jan-2024, Table "ELECTRICAL CHARACTERISTICS", row for P4SMA9.1A. The "9.1" in the part number denotes nominal VBR, and the HM3 suffix does not affect electrical specs - only material and qualification attributes.
Is P4SMA9.1AHM3/I suitable for automotive applications?
Yes, P4SMA9.1AHM3/I is AEC-Q101 qualified, as explicitly stated in the Vishay documentation under "MECHANICAL DATA" and "ORDERING INFORMATION". The "HM3" suffix indicates halogen-free, RoHS-compliant, and AEC-Q101 qualified construction. It is rated for operation from –65 °C to +150 °C junction temperature and passes MSL Level 1 reflow, making it appropriate for under-hood and cabin ECU applications.
What does the "HM3" suffix mean in P4SMA9.1AHM3/I?
The "HM3" suffix in P4SMA9.1AHM3/I specifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering table, "HM3" denotes base P/N with halogen-free molding compound, matte tin-plated leads compliant with JESD201 Class 2 whisker test, and full AEC-Q101 stress testing - distinct from "E3" (RoHS only) and "HE3" (AEC-Q101, non-halogen-free).
What is the maximum clamping voltage of P4SMA9.1AHM3/I under surge conditions?
The maximum clamping voltage (VC) of P4SMA9.1AHM3/I is 13.4 V, measured at its peak pulse current (IPPM) of 29.9 A using the standardized 10/1000 µs double-exponential waveform. This value is specified in the "ELECTRICAL CHARACTERISTICS" table of the Vishay P4SMA datasheet and defines the highest voltage imposed on the protected circuit during a 400 W transient event.
Does P4SMA9.1AHM3/I have polarity marking, and how is it oriented on the PCB?
Yes, P4SMA9.1AHM3/I is unidirectional and features a visible cathode band on the SMA (DO-214AC) package body. As shown in the "PACKAGE OUTLINE DIMENSIONS" diagram, the band marks the cathode terminal, which must be connected to the line being protected (e.g., 9 V rail), while the anode connects to ground. Incorrect orientation renders the device ineffective for reverse-transient suppression.
P4SMA9.1AHM3/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):
- 7.78V
- Voltage - Breakdown (Min):
- 8.65V
- Voltage - Clamping (Max) @ Ipp:
- 13.4V
- Current - Peak Pulse (10/1000µs):
- 29.9A
- 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)
P4SMA9.1AHM3/I FAQ
1.How can I place an order for P4SMA9.1AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA9.1AHM3/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 P4SMA9.1AHM3/I reliable?
The price and inventory of P4SMA9.1AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA9.1AHM3/I is usually 5 days.
3.What payment methods are accepted for P4SMA9.1AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA9.1AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA9.1AHM3/I?
P4SMA9.1AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA9.1AHM3/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 P4SMA9.1AHM3/I?
For technical support, including P4SMA9.1AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA9.1AHM3/I requirements.
6.How does Aetrix verify that P4SMA9.1AHM3/I is sourced from the original manufacturer or authorized distributors?
All P4SMA9.1AHM3/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 P4SMA9.1AHM3/I meets industry standards.
7.What is the process for return or replacement of P4SMA9.1AHM3/I?
All P4SMA9.1AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA9.1AHM3/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 P4SMA9.1AHM3/I part is unused and in its original packaging.
Return procedure for P4SMA9.1AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA9.1AHM3/I Tags
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