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Vishay General Semiconductor - Diodes Division 1.5SMC91AHM3/H
- Part No.:
- 1.5SMC91AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC91AHM3/H.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,832
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Product details
Overview
1.5SMC91AHM3/H from Vishay General Semiconductor is a unidirectional 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 1 mA), 77.8 V stand-off voltage (VWM), 125 V maximum clamping voltage (VC) at 12 A peak pulse current, and 1500 W peak pulse power capability with a 10/1000 µs waveform - deployed in automotive ECUs, industrial I/O modules, and DC power rail protection.
For engineers reviewing the 1.5SMC91AHM3/H datasheet, 1.5SMC91AHM3/H pinout, 1.5SMC91AHM3/H application, or 1.5SMC91AHM3/H equivalent, key selection criteria include clamping performance under surge conditions, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking, and halogen-free RoHS compliance per HM3 suffix.
Technical Context
The 1.5SMC91AHM3/H operates as a silicon avalanche diode that enters controlled breakdown when reverse voltage exceeds VWM, limiting transient energy to protected circuitry. Its glass-passivated junction ensures stable leakage (<1 µA at VWM) and fast response time (<1 ns), while the SMC (DO-214AB) package supports automated placement and meets MSL level 1 reflow requirements (260 °C peak).
Rated for -65 °C to +150 °C operating junction temperature, it delivers 12 A peak pulse current (IPPM) at 125 V clamping, with 0.106 %/°C temperature coefficient of VBR. The cathode band denotes polarity, and its 1500 W PPPM rating applies under repetitive 0.01 % duty cycle conditions with derating above 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 86.5 V / 95.5 V at 1 mA - defines precise avalanche initiation threshold for reliable overvoltage triggering |
| VWM | 77.8 V - maximum continuous reverse operating voltage before leakage rises significantly |
| VC @ IPPM | 125 V at 12 A - clamped voltage during 10/1000 µs surge, directly limiting stress on downstream ICs |
| PPPM | 1500 W - peak transient power absorption capacity without failure under standardized surge waveform |
| IFSM | 200 A - single half-sine surge current rating (8.3 ms), supporting high-energy inductive switch-off events |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, critical for PCB copper pad layout design |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration |
| Cathode | Avalanche breakdown terminal | Marked with band; connected to protected line (e.g., 12 V rail or CAN_H) to clamp positive transients |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with JEDEC J-STD-204 and IEC 61249-2-21 material restrictions |
| 1500 W peak pulse power | Withstands ISO 7637-2 Pulse 1/2a/5a surges and IEC 61000-4-5 Level 4 (4 kV) without degradation |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR ≈ 39.5 V) and reduced let-through energy during fast transients |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C) without baking preconditioning |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs against load dump and alternator ripple in body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp positive-going transients exceeding 77.8 V. Use Value: Limits peak voltage to 125 V during 12 A surge, preventing latch-up or gate oxide damage in downstream LDOs and MCUs. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA transmitter) from ESD and inductive kickback in factory automation PLCs. IC Role / Device Role / Timing Role: TVS mounted across signal and return paths to absorb ±8 kV contact ESD per IEC 61000-4-2. Use Value: Sub-1 ns response ensures clamping occurs before sensitive op-amps or ADC drivers experience overstress. |
| DC-DC Converter Input Stage | Telecom Line Card Surge Suppression |
Use Scenario: Front-end protection for 48 V input buck converters in telecom power supplies subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary unidirectional clamp on HV input rail, coordinated with upstream fuse and common-mode choke. Use Value: 1500 W PPPM rating handles 10/1000 µs surges up to 4 kV (line-to-ground) without thermal runaway. |
Use Scenario: Secondary-level protection on Ethernet PHY power rails (e.g., 3.3 V bias) in network switches exposed to induced surges. IC Role / Device Role / Timing Role: Localized TVS adjacent to PHY IC to suppress fast-rising transients coupled via magnetics or PCB traces. Use Value: 77.8 V VWM allows safe operation with 3.3 V/5 V logic rails while maintaining margin against normal operating noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90A | Lower PPPM (600 W), SMB package (smaller footprint), VC = 129 V @ 9.3 A | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or high-current load dump | Select when space-constrained layouts prioritize footprint over surge margin and automotive qualification is not required |
| 1.5KE91A | Through-hole DO-201 package, same VBR/VC, but higher RθJA (~50 °C/W on infinite heatsink only) | Requires manual assembly or wave soldering; less suitable for high-volume SMT production | Choose for legacy designs retaining through-hole infrastructure or where thermal mass of leadframe aids transient dissipation |
Compared with SMBJ90A and 1.5KE91A, the 1.5SMC91AHM3/H uniquely combines AEC-Q101 qualification, halogen-free compliance, 1500 W surge rating in an SMT-optimized SMC package, making it the preferred choice for new automotive and industrial designs requiring validated reliability and high-power transient handling.
Availability
1.5SMC91AHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom power supply designs requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant surge protection.
Supply support for 1.5SMC91AHM3/H 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, MOSFETs, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The 1.5SMC Series targets high-energy transient suppression in harsh environments, engineered for automotive, industrial, and telecom applications where consistent clamping performance and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC91AHM3/H under a 10/1000 µs surge?
The 1.5SMC91AHM3/H has a maximum clamping voltage (VC) of 125 V at 12 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88303 and reflects the upper limit of voltage let-through during surge events, ensuring downstream components remain within safe operating limits.
Is the 1.5SMC91AHM3/H qualified for automotive applications?
Yes, the 1.5SMC91AHM3/H is AEC-Q101 qualified, as confirmed by the HM3 suffix and documentation in Vishay's 1.5SMC series datasheet (Rev. 09-Mar-2026). It undergoes stress testing including temperature cycling, high-temperature reverse bias (HTRB), and ESD per the AEC-Q101 standard, making it suitable for under-hood and chassis-mounted automotive electronics.
What does the "HM3" suffix indicate in 1.5SMC91AHM3/H?
The "HM3" suffix in 1.5SMC91AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade E3/M3 versions and confirms compliance with JEDEC J-STD-204 and IEC 61249-2-21 material restrictions, plus automotive reliability validation.
How does the 1.5SMC91AHM3/H differ from bidirectional TVS diodes like 1.5SMC91CHM3/H?
The 1.5SMC91AHM3/H is unidirectional and features a cathode band for polarity identification, intended for DC line protection where only positive transients occur. In contrast, 1.5SMC91CHM3/H is bidirectional with no polarity marking and symmetric clamping for AC or differential signal lines - the two are not interchangeable without circuit redesign.
What is the thermal resistance of the 1.5SMC91AHM3/H, and how does it affect PCB layout?
The 1.5SMC91AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To maintain safe junction temperatures under repeated surges, PCB layout must provide adequate copper area and avoid thermal bottlenecks - reducing pad size increases RθJA and risks thermal failure.
1.5SMC91AHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, 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):
- 12A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
1.5SMC91AHM3/H FAQ
1.How can I place an order for 1.5SMC91AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC91AHM3/H 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 1.5SMC91AHM3/H reliable?
The price and inventory of 1.5SMC91AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC91AHM3/H is usually 5 days.
3.What payment methods are accepted for 1.5SMC91AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC91AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC91AHM3/H?
1.5SMC91AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC91AHM3/H 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 1.5SMC91AHM3/H?
For technical support, including 1.5SMC91AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC91AHM3/H requirements.
6.How does Aetrix verify that 1.5SMC91AHM3/H is sourced from the original manufacturer or authorized distributors?
All 1.5SMC91AHM3/H 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 1.5SMC91AHM3/H meets industry standards.
7.What is the process for return or replacement of 1.5SMC91AHM3/H?
All 1.5SMC91AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC91AHM3/H, 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 1.5SMC91AHM3/H part is unused and in its original packaging.
Return procedure for 1.5SMC91AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC91AHM3/H Tags
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Toshiba Semiconductor and Storage
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