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Vishay General Semiconductor - Diodes Division P4SMA91AHM3_A/I
- Part No.:
- P4SMA91AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA91AHM3_A/I.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,574
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Product details
Overview
P4SMA91AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the P4SMA series, designed for clamping voltage transients on power and signal lines. It features a 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 rating (10/1000 µs waveform). It is AEC-Q101 qualified, halogen-free, RoHS-compliant, and used for protecting MOSFETs, ICs, and sensor signal lines in automotive and industrial power supplies.
For engineers reviewing the P4SMA91AHM3_A/I datasheet, P4SMA91AHM3_A/I pinout, P4SMA91AHM3_A/I application, or P4SMA91AHM3_A/I equivalent, this page delivers verified electrical parameters, package dimensions, clamping behavior under surge conditions, thermal derating curves, and validated alternatives for ESD and lightning transient protection in 12 V–48 V DC systems.
Technical Context
The P4SMA91AHM3_A/I operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1 ns) to transient overvoltages. Its clamping action begins at VWM = 77.8 V (stand-off), triggers at VBR = 86.5–95.5 V, and limits voltage to ≤125 V at IPPM = 3.2 A - critical for safeguarding 80 V-rated MOSFETs and 100 V-input regulators.
Thermally, it exhibits RθJA = 120 °C/W (junction-to-ambient, on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W (junction-to-lead), supporting continuous power dissipation of 3.3 W at TA = 50 °C. It meets MSL Level 1 (260 °C reflow peak) and is rated for TJ = –65 to +150 °C operation.
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 onset window for predictable clamping threshold |
| VWM | 77.8 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 µA |
| 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 - surge energy handling capacity; derates to 300 W above 91 V per spec note (1) |
| IFSM | 40 A - single half-sine surge rating (8.3 ms), supports inrush and load-dump immunity in automotive 12 V systems |
| TJ max. | +150 °C - enables reliable operation in under-hood and industrial ambient environments up to 125 °C board temperature |
| Package | SMA (DO-214AC) - industry-standard SMD outline with 5.28 mm length, 4.50 mm width, 2.29 mm height; compatible with automated placement |
Pinout & Package
SMA (DO-214AC) package: molded epoxy case with matte tin-plated leads, UL 94 V-0 rated, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage rail; forms return path during transient conduction |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 12 V supply or CAN_H); conducts avalanche current when VAK > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, body electronics, and ADAS modules |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets JESD201 Class 2 whisker resistance and global environmental compliance mandates without compromising surge robustness |
| 400 W peak pulse power (10/1000 µs) | Handles ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a/b (load dump) waveforms in 12 V vehicle systems |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., EFT bursts), improving protection margin for downstream logic |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking - reduces manufacturing complexity and cost in high-volume production |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamping |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump transients (up to 60 V for 400 ms) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, conducting only during positive overvoltage events. Use Value: Limits voltage to ≤125 V during 3.2 A surges, preserving 100 V-rated DC-DC controllers and gate drivers without derating. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loops) in factory automation sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS shunting transients from signal line to ground, with <1 ns response ensuring no data corruption. Use Value: Maintains signal integrity below 100 pF junction capacitance while clamping ±15 kV contact ESD per IEC 61000-4-2. |
| Telecom DC Power Input Stage | Consumer Power Adapter Secondary Side |
|
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras) from induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of DC-DC converter, absorbing IEEE 802.3bt-compliant surge energy. Use Value: Withstands 400 W pulses without degradation, enabling single-stage protection architecture and reducing BOM count. |
Use Scenario: Suppressing switching noise and line transients on secondary-side 5–12 V rails in USB-C PD adapters. IC Role / Device Role / Timing Role: Fast-acting unidirectional suppressor across output capacitor, preventing overvoltage damage to connected devices. Use Value: 77.8 V stand-off ensures no conduction during normal operation; 125 V clamping protects USB-PD sink ICs rated to 20 V absolute max. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90A-E3/5A | 90 V VBR (85.5–94.5 V), same SMA package, 400 W rating, but commercial-grade (not AEC-Q101 or halogen-free) | Lacks automotive qualification and halogen-free certification; suitable for industrial/commercial designs without automotive compliance needs | Select when AEC-Q101 and RoHS/halogen-free requirements are not mandated, and cost optimization is prioritized |
| 1.5SMC91A | Same VBR range (86.5–95.5 V), higher 1500 W rating, but larger SMC (DO-214AB) package (7.11 × 6.22 mm) | Requires PCB layout change due to larger footprint and higher thermal mass; better for higher-energy surges where space allows | Choose when system-level surge tests exceed 400 W (e.g., IEC 61000-4-5 Level 4) and board area permits SMC footprint |
Compared with P4SMA91AHM3_A/I, SMAJ90A-E3/5A offers identical clamping performance at lower cost but lacks automotive qualification, while 1.5SMC91A provides greater surge margin in a larger package - making P4SMA91AHM3_A/I the optimal balance of AEC-Q101 compliance, halogen-free construction, and compact SMA footprint for space-constrained automotive and industrial designs.
Availability
P4SMA91AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power inputs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for P4SMA91AHM3_A/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 performance.
The P4SMA Series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, low-profile packaging, and repeatable clamping are essential design requirements.
FAQ
What is the breakdown voltage tolerance for P4SMA91AHM3_A/I?
The P4SMA91AHM3_A/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 window ensures consistent clamping behavior across production lots and supports precise overvoltage protection design in 12 V and 24 V systems where margin to downstream device ratings is critical. The P4SMA91AHM3_A/I datasheet confirms this range under "ELECTRICAL CHARACTERISTICS" Table 1.
Is P4SMA91AHM3_A/I suitable for bidirectional transient protection?
No, P4SMA91AHM3_A/I is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only during positive overvoltage events (anode grounded, cathode to protected line). For bidirectional protection, Vishay specifies the "CA" suffix (e.g., P4SMA91CA). Using P4SMA91AHM3_A/I in bidirectional applications would leave the negative half-cycle unprotected, risking damage to sensitive components. Always verify polarity configuration before integration.
What does the "HM3_A/I" suffix mean in P4SMA91AHM3_A/I?
The "HM3" denotes halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance; "A" indicates AEC-Q101 qualification for automotive use; "I" specifies 7500-unit tape-and-reel packaging on 13-inch reels. This full suffix confirms P4SMA91AHM3_A/I meets automotive reliability standards, environmental regulations, and high-volume SMT assembly requirements - distinguishing it from commercial variants like P4SMA91A-E3/61.
How does P4SMA91AHM3_A/I perform under elevated ambient temperatures?
P4SMA91AHM3_A/I derates linearly above TA = 25 °C per Figure 2 in the datasheet: its peak pulse power drops to ~300 W at 70 °C ambient and ~200 W at 100 °C. Continuous power dissipation (PD) is rated at 3.3 W at TA = 50 °C, decreasing by ~27 mW/°C thereafter. Designers must apply these derating curves when sizing thermal pads or estimating lifetime in under-hood or enclosed industrial enclosures.
Can P4SMA91AHM3_A/I replace P4SMA91AHE3_A/I in an existing design?
Yes, P4SMA91AHM3_A/I is a direct functional and mechanical replacement for P4SMA91AHE3_A/I, sharing identical electrical specs (VBR, VC, PPPM), SMA package dimensions, and AEC-Q101 qualification. The only difference is HM3's halogen-free molding compound versus HE3's standard RoHS-compliant compound - both meet JESD201 Class 2 and have identical solderability and MSL Level 1 ratings. No PCB or firmware changes are required.
P4SMA91AHM3_A/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:
- 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/I FAQ
1.How can I place an order for P4SMA91AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA91AHM3_A/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_A/I reliable?
The price and inventory of P4SMA91AHM3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for P4SMA91AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA91AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA91AHM3_A/I?
P4SMA91AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA91AHM3_A/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_A/I?
For technical support, including P4SMA91AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA91AHM3_A/I requirements.
6.How does Aetrix verify that P4SMA91AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All P4SMA91AHM3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of P4SMA91AHM3_A/I?
All P4SMA91AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA91AHM3_A/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_A/I part is unused and in its original packaging.
Return procedure for P4SMA91AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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