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Vishay General Semiconductor - Diodes Division 1.5SMC91AHE3/57T
- Part No.:
- 1.5SMC91AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC91AHE3/57T.pdf
- Description:
- TVS DIODE 77.8VWM 125VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,852
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Product details
Overview
1.5SMC91AHE3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMC (DO-214AB) package, designed for high-energy surge protection. It features a 91 V breakdown voltage (VBR = 86.5–95.5 V at IT = 1.0 mA), 77.8 V stand-off voltage (VWM), and clamps transients to ≤125 V at 12.0 A peak pulse current (IPPM) under 10/1000 μs waveform - used to protect automotive sensor signal lines against inductive switching and ESD.
For engineers reviewing the 1.5SMC91AHE3/57T datasheet, 1.5SMC91AHE3/57T pinout, 1.5SMC91AHE3/57T application, or 1.5SMC91AHE3/57T equivalent, this AEC-Q101 qualified TVS offers verified 1500 W peak pulse power, low incremental surge resistance, and RoHS-compliant matte tin-plated leads suitable for automated placement in harsh-environment automotive and industrial control systems.
Technical Context
The 1.5SMC91AHE3/57T operates as a unidirectional clamping device with cathode-band polarity marking, leveraging glass-passivated junction technology for stable avalanche behavior. Its thermal resistance (RθJA = 75 °C/W) and junction temperature range (–65 to +150 °C) support reliable operation on standard 8.0 mm × 8.0 mm copper pads without forced cooling.
It delivers fast response time (<1 ps) and excellent clamping ratio (VC/VBR ≈ 1.30), with low reverse leakage (<1.0 μA at VWM) and a positive temperature coefficient of VBR (+0.106 %/°C), ensuring predictable voltage drift across temperature in safety-critical circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VBR | 86.5–95.5 V at 1.0 mA test current - defines precise avalanche initiation threshold for repeatable clamping |
| Stand-off Voltage VWM | 77.8 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA |
| Clamping Voltage VC | ≤125 V at 12.0 A IPPM (10/1000 μs) - limits transient voltage seen by protected ICs or MOSFETs |
| Peak Pulse Power PPPM | 1500 W - enables robust protection against lightning-induced surges and load-dump events |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 0.320" × 0.246" footprint and MSL Level 1 rating |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| RoHS & Halogen-Free Status | RoHS-compliant (E3 suffix); not halogen-free - meets commercial and automotive environmental compliance requirements |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices; terminals solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to system ground or low-side reference in unidirectional TVS configurations |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., CAN_H, LIN, sensor output); band-marked end |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-ground) without derating |
| Glass passivated chip junction | Ensures long-term stability of VBR and low parameter drift over 10+ years in automotive environments |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a) |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without moisture-related popcorn failure |
| AEC-Q101 qualification | Validates performance across –40 to +125 °C ambient, including HTOL, TC, and UHAST stress tests |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loop) of engine coolant temperature sensors from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between signal line and chassis ground, absorbing >100 A surge currents within nanoseconds. Use Value: Prevents latch-up or gate oxide damage in downstream op-amps and ADCs while maintaining <1.0 μA leakage at 77.8 V nominal supply. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Standoff-mode protector on 24 V DC inputs, triggered only during transients exceeding 77.8 V, with <125 V clamping ceiling. Use Value: Enables uninterrupted operation during 1500 W surge events without requiring external series impedance or timing delays. |
| Telecom Line Interface | Consumer Power Adapter ESD Guard |
|
Use Scenario: Shielding RS-485 transceiver pins in outdoor base station equipment from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Primary-level TVS on differential pair, coordinated with secondary GDT or MOV for staged protection architecture. Use Value: Achieves <1 ns response time and clamps to ≤125 V, preserving signal integrity up to 10 Mbps under repeated 10/1000 μs stress. |
Use Scenario: Adding secondary-side surge immunity to USB-C PD adapter output rails against user-handling ESD and cable coupling. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 μA) unidirectional clamp on 5–20 V output, rated for 1500 W to meet UL 62368-1 Annex D. Use Value: Maintains no-load efficiency while passing IEC 61000-4-2 ±8 kV contact discharge without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90A-E3/57T | Lower PPPM (400 W), smaller SMA package (DO-214AC), VBR = 100–111 V, VC = 150 V @ 2.7 A | Not AEC-Q101 qualified; suited for cost-sensitive consumer electronics, not automotive | Select when board space is constrained and surge energy is ≤400 W (e.g., USB data lines) |
| 1.5KE91A-E3/54 | Through-hole DO-201 package, same VBR/VC, but higher RθJA (100 °C/W) and no AEC-Q101 qualification | Limited to non-automotive industrial use due to lack of automotive qualification and manual assembly requirement | Choose only for legacy through-hole designs where rework tolerance and hand-soldering are acceptable |
Compared with SMAJ90A-E3/57T and 1.5KE91A-E3/54, the 1.5SMC91AHE3/57T uniquely combines AEC-Q101 qualification, 1500 W capability, and SMC surface-mount compatibility - enabling drop-in replacement in automotive ECUs without layout or thermal redesign.
Availability
1.5SMC91AHE3/57T is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom line interfaces, and consumer power adapter designs requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for 1.5SMC91AHE3/57T 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The 1.5SMC Series was engineered specifically for high-power transient suppression in space-constrained, high-reliability applications - emphasizing AEC-Q101 qualification, low clamping voltage, and robust surge handling in SMC packaging.
FAQ
What is the clamping voltage of the 1.5SMC91AHE3/57T at its rated peak pulse current?
The 1.5SMC91AHE3/57T clamps to a maximum of 125 V at its rated peak pulse current of 12.0 A under the standard 10/1000 μs waveform. This value is measured per Figure 1 in Vishay Document 88303 and ensures downstream ICs experience limited overvoltage during surge events. The 1.5SMC91AHE3/57T maintains this clamping performance across its full operating temperature range (–65 to +150 °C).
Is the 1.5SMC91AHE3/57T qualified for automotive applications?
Yes, the 1.5SMC91AHE3/57T carries the HE3 suffix, confirming it is RoHS-compliant and AEC-Q101 qualified. It has passed all required stress tests including high-temperature operating life (HTOL), temperature cycling (TC), and unbiased highly accelerated stress testing (UHAST). The 1.5SMC91AHE3/57T is approved for use in engine control units, body electronics, and ADAS sensor modules.
What is the reverse leakage current specification for the 1.5SMC91AHE3/57T at its stand-off voltage?
The 1.5SMC91AHE3/57T exhibits a maximum reverse leakage current (ID) of 1.0 μA at its stand-off voltage (VWM) of 77.8 V, measured at TA = 25 °C. This ultra-low leakage ensures minimal power loss in always-on automotive circuits and preserves accuracy in precision analog sensor interfaces protected by the 1.5SMC91AHE3/57T.
Does the 1.5SMC91AHE3/57T have a defined polarity marking, and how is it identified?
Yes, the 1.5SMC91AHE3/57T is unidirectional and features a visible cathode band on the SMC (DO-214AB) package body. Per Vishay's mechanical drawings, this band identifies the cathode terminal - the side connected to the protected signal line - while the opposite end is the anode, typically tied to ground. Polarity must be observed during PCB layout to ensure correct clamping operation of the 1.5SMC91AHE3/57T.
What is the thermal resistance junction-to-ambient (RθJA) for the 1.5SMC91AHE3/57T, and what does it imply for PCB layout?
The 1.5SMC91AHE3/57T has a typical RθJA of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad per terminal. This value assumes standard FR-4 PCB with no internal copper planes. To maintain safe junction temperatures under repetitive surges, designers should implement these minimum pad dimensions and avoid excessive trace length - critical for sustained reliability of the 1.5SMC91AHE3/57T in automotive applications.
1.5SMC91AHE3/57T 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:
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC91AHE3/57T FAQ
1.How can I place an order for 1.5SMC91AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC91AHE3/57T 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 1.5SMC91AHE3/57T reliable?
The price and inventory of 1.5SMC91AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC91AHE3/57T is usually 5 days.
3.What payment methods are accepted for 1.5SMC91AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC91AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC91AHE3/57T?
1.5SMC91AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC91AHE3/57T 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 1.5SMC91AHE3/57T?
For technical support, including 1.5SMC91AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC91AHE3/57T requirements.
6.How does Aetrix verify that 1.5SMC91AHE3/57T is sourced from the original manufacturer or authorized distributors?
All 1.5SMC91AHE3/57T 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 1.5SMC91AHE3/57T meets industry standards.
7.What is the process for return or replacement of 1.5SMC91AHE3/57T?
All 1.5SMC91AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC91AHE3/57T, 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 1.5SMC91AHE3/57T part is unused and in its original packaging.
Return procedure for 1.5SMC91AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC91AHE3/57T Tags
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