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Vishay General Semiconductor - Diodes Division 1.5SMC91A-E3/57T
- Part No.:
- 1.5SMC91A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC91A-E3/57T.pdf
- Description:
- TVS DIODE 77.8VWM 125VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,692
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Product details
Overview
1.5SMC91A-E3/57T 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 capability with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and DC power rail surge suppression.
For engineers reviewing the 1.5SMC91A-E3/57T datasheet, 1.5SMC91A-E3/57T pinout, 1.5SMC91A-E3/57T application, or 1.5SMC91A-E3/57T equivalent, key selection criteria include unidirectional polarity, SMC (DO-214AB) package compatibility, clamping performance under repetitive transients, thermal derating above 25 °C, and AEC-Q101 qualification path via HE3 suffix variants.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM (77.8 V), it transitions rapidly from high-impedance to low-impedance state, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown and low leakage (<1 μA at VWM).
Designed for 10/1000 μs surge waveforms per REA standards, it delivers 12 A peak pulse current (IPPM) with 125 V clamping, 0.01% duty cycle rating, and thermal resistance of 75 °C/W (junction-to-ambient). It meets J-STD-020 MSL Level 1 and supports automated SMT placement on standard 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 86.5 V / 95.5 V at 1 mA - defines precise voltage threshold for avalanche conduction onset |
| VWM | 77.8 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 125 V at 12 A - clamping voltage limiting stress on protected ICs during surge events |
| PPPM | 1500 W - peak transient power handling with 10/1000 μs waveform, enabling lightning/inductive-switching immunity |
| IPPM | 12 A - peak surge current capacity directly tied to VC and PCB pad thermal design |
| TJ max | 150 °C - maximum junction temperature defining safe operating area under sustained power dissipation |
| RθJA | 75 °C/W - thermal resistance used to calculate junction temperature rise from ambient and power dissipation |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case with matte tin-plated leads; cathode indicated by band marking; compliant with UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path (unidirectional) | Connected to ground or low-impedance return plane; must handle full IPPM without trace fusing |
| Cathode | Reverse-biased terminal / Surge shunt node | Connected to protected line; clamps voltage to VC when transient exceeds VWM |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V systems without cascaded stages |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD or relay bounce), improving system immunity margin |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow without baking, simplifying SMT manufacturing flow |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure |
| RoHS-compliant, halogen-free option (M3 suffix) | Meets IPC-1752A material declaration requirements for automotive and industrial OEMs |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects microcontroller GPIO and CAN transceiver power rails from load-dump and jump-start transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VBAT and ground, clamping spikes within 1 ns. Use Value: Limits voltage to ≤125 V during 35 V/100 ms load dump, preventing latch-up or gate oxide damage in 3.3 V/5 V logic. |
Use Scenario: Shields 24 V digital input optocoupler front-end from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input terminal block, upstream of series current-limiting resistor. Use Value: Absorbs 1500 W surges without degradation, maintaining <1 μA leakage at 24 V nominal to avoid false triggering. |
| Telecom Power Supply Output | Consumer Appliance Motor Driver Board |
Use Scenario: Safeguards isolated DC-DC converter secondary-side outputs against backfeed transients from connected equipment. IC Role / Device Role / Timing Role: Secondary-side TVS across +VOUT/GND, sized for 48 V output rails. Use Value: Clamps to 125 V while dissipating 1500 W, preserving downstream LDOs and communication ICs during hot-swap events. |
Use Scenario: Suppresses inductive kickback from brushed DC motor commutation on MCU-controlled appliance boards. IC Role / Device Role / Timing Role: Mounted across motor terminals, parallel to flyback diode, to reduce voltage ring and EMI. Use Value: Low clamping voltage (125 V) and fast response limit MOSFET drain-source stress below 100 V rating margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ91A-E3/52 | Lower PPPM (600 W), SMB package (smaller footprint, higher RθJA = 85 °C/W) | Reduced surge handling; suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD, not lightning) | Select when board space is constrained and surge threat level is limited to ±8 kV contact ESD. |
| 1.5KE91A | Through-hole DO-201 package, identical VBR/VC, but slower response and no MSL Level 1 rating | Not compatible with automated SMT lines; requires wave solder or hand assembly; unsuitable for high-reliability automotive PCBs | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with 1.5SMC91A-E3/57T, SMBJ91A-E3/52 trades surge robustness for compactness, while 1.5KE91A sacrifices SMT manufacturability and thermal performance for mechanical ruggedness - making 1.5SMC91A-E3/57T optimal for production-grade surface-mount surge protection requiring 1500 W capability and automotive process compliance.
Availability
1.5SMC91A-E3/57T is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, telecom power supplies, and consumer appliance motor control requiring stable component supply, RoHS compliance, and consistent surge performance across production lots.
Supply support for 1.5SMC91A-E3/57T 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 protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The 1.5SMC Series was engineered for high-power surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where compact size, repeatable clamping, and AEC-Q101 readiness are mandatory.
FAQ
What is the maximum clamping voltage of the 1.5SMC91A-E3/57T under a 10/1000 μs surge?
The 1.5SMC91A-E3/57T has a maximum clamping voltage (VC) of 125 V at 12 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet (Document Number 88303, Rev. 09-Mar-2026) and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The 1.5SMC91A-E3/57T maintains this clamping performance across its rated junction temperature range.
Is the 1.5SMC91A-E3/57T suitable for automotive applications?
The 1.5SMC91A-E3/57T itself is RoHS-compliant and commercial-grade; however, Vishay offers AEC-Q101 qualified versions under the HE3/HM3 suffixes (e.g., 1.5SMC91AHE3_A). While the 1.5SMC91A-E3/57T shares identical electrical specs and SMC packaging, formal automotive qualification requires the HE3 variant. For non-safety-critical automotive subsystems with internal validation, the 1.5SMC91A-E3/57T is widely deployed - but full AEC-Q101 compliance mandates the HE3 suffix.
What is the standoff voltage (VWM) and why does it matter for 1.5SMC91A-E3/57T layout?
The 1.5SMC91A-E3/57T has a standoff voltage (VWM) of 77.8 V - the maximum continuous reverse voltage it can block without exceeding 1 μA leakage. This parameter dictates minimum system operating margin: for a 72 V nominal bus, VWM provides 5.8 V headroom before conduction begins. Layout must ensure no parasitic coupling raises local voltage beyond VWM, especially near switching nodes, to prevent premature clamping or increased standby current in the 1.5SMC91A-E3/57T.
How does the SMC (DO-214AB) package of the 1.5SMC91A-E3/57T affect thermal performance?
The SMC (DO-214AB) package of the 1.5SMC91A-E3/57T delivers a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per Vishay's recommended layout. This enables reliable operation up to 150 °C junction temperature under pulsed conditions. Reducing pad size or omitting thermal vias increases RθJA, risking thermal runaway during repetitive surges - so PCB layout must strictly follow the 1.5SMC91A-E3/57T's thermal guidelines to sustain 1500 W peak power.
Can the 1.5SMC91A-E3/57T be used in bidirectional configurations?
No - the 1.5SMC91A-E3/57T is a unidirectional TVS diode, identified by its "A" suffix and cathode band marking. Bidirectional operation requires the "CA" suffix (e.g., 1.5SMC91CA). Using the 1.5SMC91A-E3/57T in reverse-biased AC signal paths would result in forward conduction and failure. For bidirectional protection such as RS-485 or USB data lines, the 1.5SMC91CA variant must be selected instead of the 1.5SMC91A-E3/57T.
1.5SMC91A-E3/57T 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-E3/57T FAQ
1.How can I place an order for 1.5SMC91A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC91A-E3/57T 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-E3/57T reliable?
The price and inventory of 1.5SMC91A-E3/57T 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-E3/57T is usually 5 days.
3.What payment methods are accepted for 1.5SMC91A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC91A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC91A-E3/57T?
1.5SMC91A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC91A-E3/57T 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-E3/57T?
For technical support, including 1.5SMC91A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC91A-E3/57T requirements.
6.How does Aetrix verify that 1.5SMC91A-E3/57T is sourced from the original manufacturer or authorized distributors?
All 1.5SMC91A-E3/57T 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-E3/57T meets industry standards.
7.What is the process for return or replacement of 1.5SMC91A-E3/57T?
All 1.5SMC91A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC91A-E3/57T, 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-E3/57T part is unused and in its original packaging.
Return procedure for 1.5SMC91A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC91A-E3/57T Tags
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