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Vishay General Semiconductor - Diodes Division 1.5SMC91A-M3/9AT
- Part No.:
- 1.5SMC91A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC91A-M3/9AT.pdf
- Description:
- TVS DIODE 77.8VWM 125VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,993
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Product details
Overview
1.5SMC91A-M3/9AT 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 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 rating with 10/1000 µs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and DC power rail protection.
For engineers reviewing the 1.5SMC91A-M3/9AT datasheet, 1.5SMC91A-M3/9AT pinout, 1.5SMC91A-M3/9AT application, or 1.5SMC91A-M3/9AT equivalent, key selection criteria include unidirectional polarity, SMC (DO-214AB) package compatibility, clamping performance under 12 A surge, thermal resistance (RθJA = 75 °C/W), and halogen-free RoHS compliance per M3 suffix.
Technical Context
The 1.5SMC91A-M3/9AT operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown behavior and fast response (<1 ps) to transient events. Its clamping action begins at VWM = 77.8 V and limits voltage to ≤125 V during 12 A, 10/1000 µs surges - critical for safeguarding downstream MOSFETs and microcontrollers.
Thermally, it supports operation from −65 °C to +150 °C junction temperature, with derated peak pulse power above 25 °C per Fig. 2 and RθJL = 15 °C/W enabling effective heat transfer to PCB copper pads. The cathode band marking confirms polarity, and its M3 suffix denotes halogen-free, RoHS-compliant construction qualified to JESD 201 Class 2 whisker standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 86.5 V / 95.5 V at 1 mA - defines precise avalanche initiation range for reliable overvoltage triggering |
| VWM | 77.8 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPPM | 125 V at 12 A - clamped voltage during 10/1000 µs surge, limiting stress on protected ICs |
| PPPM | 1500 W - peak pulse power handling capability under standardized lightning/surge conditions |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, guiding PCB pad design for thermal reliability |
| TJ max | +150 °C - maximum junction temperature enabling use in under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad requirement |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to ground or low-side reference in unidirectional TVS configuration | Provides return path during clamping; requires low-inductance grounding for optimal surge dissipation |
| Cathode | Current exit terminal in forward bias; connected to protected line (e.g., 12 V rail, CAN_H, sensor output) | Marked with band; reverse-biased during normal operation; avalanches into conduction when VLINE > VBR |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V systems |
| Glass passivated chip junction | Ensures long-term stability of VBR and low parameter drift across temperature and lifetime |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving margin for 3.3 V/5 V logic interfaces |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements |
| Halogen-free, RoHS-compliant (M3 suffix) | Fulfills environmental compliance mandates for automotive and industrial OEM supply chains |
Applications
| Automotive Body Control Module (BCM) Power Input | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: 12 V battery-supplied BCM experiences load dump (ISO 7637-2 Pulse 5a) and coupled transients from relay switching. IC Role / Device Role / Timing Role: Unidirectional TVS placed between fused 12 V rail and LDO input to clamp surges before regulation. Use Value: Clamps to ≤125 V at 12 A, preventing LDO overvoltage failure and ensuring MCU reset integrity during harsh electrical events. |
Use Scenario: 4–20 mA current loop inputs in programmable logic controllers exposed to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: TVS mounted across input terminals to shunt transients before precision op-amp front-end. Use Value: Sub-1 ns response and 77.8 V VWM allow safe operation with 24 V loop supply while protecting 36 V-rated amplifiers. |
| DC-DC Converter Output Rail Protection | Automotive Camera Sensor Power Line |
Use Scenario: 5 V output of isolated flyback converter powering safety-critical vision processor must survive conducted surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed directly at converter output capacitor to suppress ringing and external transients. Use Value: 125 V clamping voltage provides >2× margin over 5 V rail, avoiding false triggering while maintaining tight output regulation. |
Use Scenario: 12 V power feed to rear-view camera module subjected to hot-swap and cable discharge events. IC Role / Device Role / Timing Role: TVS integrated into FAKRA connector subassembly to protect image sensor and serializer ICs. Use Value: SMC package enables compact placement near connector; halogen-free M3 suffix meets automotive material compliance (GMW3172, LV-124). |
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-E3/52T | Lower PPPM (600 W), SMB package (smaller footprint), VBR = 100–111 V, VC = 150 V @ 4 A | Rated for lower-energy transients; suitable for space-constrained consumer electronics, not automotive load dump | Select when board area is limited and surge energy does not exceed IEC 61000-4-5 Level 2 (1 kV/42 Ω) |
| 1.5KE91A | Through-hole DO-201 package, same VBR/VC, but higher RθJA (~100 °C/W), no MSL Level 1 rating | Requires wave soldering; unsuitable for high-density SMT assemblies or automated placement | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMBJ90A-E3/52T and 1.5KE91A, the 1.5SMC91A-M3/9AT delivers superior surge robustness (1500 W vs. 600 W or 1500 W with inferior thermal performance), SMT scalability, and automotive-grade material compliance - making it the preferred choice for production-grade automotive and industrial power-line protection.
Availability
1.5SMC91A-M3/9AT is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and DC-DC converter output protection requiring stable component supply, halogen-free compliance, and AEC-Q101-aligned reliability.
Supply support for 1.5SMC91A-M3/9AT 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 1.5SMC Series was engineered for high-power, surface-mount transient suppression in demanding environments - targeting automotive, industrial, and telecom infrastructure where consistent clamping, thermal resilience, and regulatory compliance are mandatory.
FAQ
What is the breakdown voltage tolerance of the 1.5SMC91A-M3/9AT?
The 1.5SMC91A-M3/9AT 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 predictable clamping onset across production lots and supports deterministic circuit protection design without over-margining.
Is the 1.5SMC91A-M3/9AT suitable for bidirectional transient protection?
No, the 1.5SMC91A-M3/9AT is a unidirectional TVS diode, identified by the "A" suffix and cathode band marking. For bidirectional protection, Vishay offers the 1.5SMC91CA variant. Using the 1.5SMC91A-M3/9AT in bidirectional applications would result in forward conduction during negative transients, potentially damaging the device or unprotected circuitry.
What is the maximum clamping voltage of the 1.5SMC91A-M3/9AT under surge conditions?
The 1.5SMC91A-M3/9AT exhibits a maximum clamping voltage (VC) of 125 V at 12 A peak pulse current with a 10/1000 µs waveform. This value is guaranteed per datasheet testing and defines the upper voltage limit imposed on protected circuitry during standardized surge events - critical for validating voltage margins of downstream components.
Does the 1.5SMC91A-M3/9AT meet AEC-Q101 qualification?
The base 1.5SMC91A-M3/9AT is not AEC-Q101 qualified; it is a commercial-grade part with halogen-free RoHS compliance (M3 suffix). For automotive-qualified versions, Vishay offers the 1.5SMC91AHE3_A or 1.5SMC91AHM3_A variants - the latter being both halogen-free and AEC-Q101 certified per revision notes in the datasheet.
What PCB pad layout is recommended for optimal thermal performance of the 1.5SMC91A-M3/9AT?
Vishay specifies a minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad area per terminal for the 1.5SMC91A-M3/9AT to achieve rated 1500 W pulse power and thermal resistance (RθJA = 75 °C/W). Reducing pad size increases junction temperature rise and de-rates surge capability - verified in Fig. 2 of the datasheet.
1.5SMC91A-M3/9AT 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:
- 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):
- 12A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC91A-M3/9AT FAQ
1.How can I place an order for 1.5SMC91A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC91A-M3/9AT 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 1.5SMC91A-M3/9AT reliable?
The price and inventory of 1.5SMC91A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC91A-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC91A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC91A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC91A-M3/9AT?
1.5SMC91A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC91A-M3/9AT 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 1.5SMC91A-M3/9AT?
For technical support, including 1.5SMC91A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC91A-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC91A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC91A-M3/9AT 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 1.5SMC91A-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC91A-M3/9AT?
All 1.5SMC91A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC91A-M3/9AT, 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 1.5SMC91A-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC91A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC91A-M3/9AT Tags
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