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Vishay General Semiconductor - Diodes Division P4SMA91AHE3/5A
- Part No.:
- P4SMA91AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA91AHE3/5A.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,038
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Product details
Overview
P4SMA91AHE3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in 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 and housed in an SMA (DO-214AC) package - ideal for automotive power rail and sensor interface protection.
For engineers reviewing the P4SMA91AHE3/5A datasheet, P4SMA91AHE3/5A pinout, P4SMA91AHE3/5A application, or P4SMA91AHE3/5A equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, and validated automotive-grade compliance - all critical for ESD/surge hardening of 12 V/24 V systems.
Technical Context
The P4SMA91AHE3/5A operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1 ns) to transient events such as ISO 7637-2 load dump or IEC 61000-4-5 surges. Its 77.8 V stand-off voltage (VWM) ensures stable operation below 91 V nominal system rails while blocking leakage <1.0 µA.
Thermal design is constrained by RθJA = 120 °C/W (typ.) and TJ(max) = +150 °C, requiring PCB copper pad area ≥0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal to sustain 400 W peak pulse power. Derating begins above TA = 25 °C per Figure 2, reducing IPPM by ~50% at 100 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VBR | 86.5–95.5 V at IT = 1.0 mA - defines precise avalanche initiation threshold for reliable overvoltage triggering |
| Stand-off Voltage VWM | 77.8 V - maximum continuous reverse voltage before leakage exceeds 1.0 µA; sets safe operating margin below VBR |
| Clamping Voltage VC | 125 V at IPPM = 3.2 A (10/1000 µs) - limits downstream voltage stress during surge events |
| Peak Pulse Power PPPM | 400 W - sustains single 10/1000 µs transients on properly heatsinked PCB pads; drops to 300 W above 91 V per spec note |
| Operating Temperature | −65 °C to +150 °C - supports under-hood automotive environments and industrial control cabinets |
| AEC-Q101 Qualified | Yes - validated for automotive electronics per stress test requirements including HTGB, HTRB, and temperature cycling |
| Package | SMA (DO-214AC) - surface-mount, low-profile (max height 2.29 mm), RoHS-compliant matte tin terminals |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with cathode band marking; dimensions 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected circuit ground or low-side return path | Enables unidirectional clamping from cathode to anode during positive transients; must be tied to lowest potential node |
| Cathode | Current exit point in forward bias; marked with band; connected to protected line (e.g., 12 V rail or signal) | Defines polarity-sensitive connection - reverse-biased during normal operation; avalanches into conduction when line voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Supports high-energy transients like ISO 7637-2 Pulse 5a without degradation when mounted on 5 mm × 5 mm copper pads |
| AEC-Q101 qualification | Validated reliability for automotive powertrain, body control, and ADAS modules - eliminates need for additional qualification testing |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1 µA) across temperature and lifetime, critical for battery-powered sensors |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD), improving protection margin for downstream ICs |
| MSL Level 1 (J-STD-020) | Allows unlimited floor life and reflow up to 260 °C peak - compatible with standard SMT assembly without baking or special handling |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V/24 V supply lines in engine control units (ECUs) against load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤125 V, preventing damage to LDOs and microcontrollers rated for 36 V absolute max input. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure/temperature sensors from EFT and surge coupling. IC Role / Device Role / Timing Role: Low-capacitance (CJ ≈ 50 pF at VWM) unidirectional clamp on signal line, referenced to local ground. Use Value: Maintains signal integrity with <1 µA leakage at 77.8 V, avoiding offset errors while suppressing ±2 kV ESD per IEC 61000-4-2. |
| Telecom Line Card Surge Protection | Consumer Power Adapter Input Stage |
Use Scenario: Safeguarding DC input of PoE-powered network switches against lightning-induced surges on 48 V bus. IC Role / Device Role / Timing Role: Primary clamping element upstream of hot-swap controller and filter capacitors. Use Value: Withstands 3.2 A peak pulse current at 125 V clamp, limiting energy delivered to downstream FETs and controllers. |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters after rectification but before bulk capacitor. IC Role / Device Role / Timing Role: Unidirectional TVS across +VOUT and GND to absorb switching spikes from flyback transformer leakage inductance. Use Value: Fast <1 ns response captures sub-microsecond ringing, and 77.8 V VWM avoids false triggering during 90 VAC brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90A | Same VBR range (85.5–94.5 V), but SMB package (DO-214AA) - 20 % larger footprint and higher RθJA (150 °C/W) | Limited to lower-power or less thermally constrained layouts; not AEC-Q101 qualified in standard grade | Select when existing PCB layout uses SMB footprint and AEC-Q101 is not required. |
| 1.5KE91A | Through-hole TO-204AE (DO-201AD); higher PPPM (1500 W) but slower response and no automotive qualification | Suitable for prototyping or non-automotive industrial mains input stages where board space and reflow compatibility are secondary | Choose only for legacy through-hole designs or where >400 W surge handling is mandatory and SMT is not feasible. |
Compared with SMBJ90A and 1.5KE91A, the P4SMA91AHE3/5A offers superior thermal performance in compact SMT form, guaranteed AEC-Q101 compliance, and optimized clamping for modern automotive 12 V systems - making it the preferred choice for volume production in ECUs and ADAS modules.
Availability
P4SMA91AHE3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom power supply designs requiring stable component supply, AEC-Q101 validation, and consistent 400 W surge capability.
Supply support for P4SMA91AHE3/5A 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA91AHE3/5A belongs to Vishay's TRANSZORB® TVS family - engineered specifically for high-reliability transient suppression in automotive, industrial, and communications infrastructure where precision clamping and long-term stability are critical.
FAQ
What is the maximum clamping voltage of the P4SMA91AHE3/5A under a 10/1000 µs surge?
The P4SMA91AHE3/5A exhibits a maximum clamping voltage (VC) of 125 V when subjected to its rated peak pulse current of 3.2 A using the standardized 10/1000 µs waveform. This value is measured at TA = 25 °C on recommended 5.0 mm × 5.0 mm copper pads and represents the upper voltage limit imposed on protected circuitry during transient events.
Is the P4SMA91AHE3/5A suitable for automotive applications?
Yes, the P4SMA91AHE3/5A is explicitly AEC-Q101 qualified, as confirmed by Vishay's documentation and ordering code suffix "HE3". It has undergone stress testing including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling - making it approved for use in engine control units, body electronics, and ADAS subsystems.
What does the "HE3/5A" suffix indicate in P4SMA91AHE3/5A?
The "HE3" denotes RoHS-compliant construction with AEC-Q101 qualification, while "/5A" specifies packaging in 13-inch diameter tape-and-reel format containing 7500 units. This differs from "/61", which indicates 7-inch reels with 1800 units - both share identical electrical and thermal specifications.
How does the P4SMA91AHE3/5A compare to bidirectional TVS diodes like P4SMA91CA?
The P4SMA91AHE3/5A is unidirectional and intended for DC line protection where polarity is fixed (e.g., 12 V supply rails), offering tighter VBR tolerance and lower leakage. In contrast, P4SMA91CA is bidirectional and suited for AC-coupled or polarity-agnostic signals (e.g., data lines), but exhibits higher leakage and slightly reduced clamping efficiency due to dual-junction architecture.
What PCB layout guidance applies to the P4SMA91AHE3/5A to achieve full 400 W rating?
To sustain the full 400 W peak pulse power rating, the P4SMA91AHE3/5A must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay's datasheet Figure 1. Smaller pads reduce heat dissipation, causing premature thermal runaway and de-rating to 300 W or less - especially above 25 °C ambient.
P4SMA91AHE3/5A 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA91AHE3/5A FAQ
1.How can I place an order for P4SMA91AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA91AHE3/5A 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 P4SMA91AHE3/5A reliable?
The price and inventory of P4SMA91AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA91AHE3/5A is usually 5 days.
3.What payment methods are accepted for P4SMA91AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA91AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA91AHE3/5A?
P4SMA91AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA91AHE3/5A 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 P4SMA91AHE3/5A?
For technical support, including P4SMA91AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA91AHE3/5A requirements.
6.How does Aetrix verify that P4SMA91AHE3/5A is sourced from the original manufacturer or authorized distributors?
All P4SMA91AHE3/5A 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 P4SMA91AHE3/5A meets industry standards.
7.What is the process for return or replacement of P4SMA91AHE3/5A?
All P4SMA91AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA91AHE3/5A, 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 P4SMA91AHE3/5A part is unused and in its original packaging.
Return procedure for P4SMA91AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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