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Vishay General Semiconductor - Diodes Division 1.5SMC91CA-E3/57T
- Part No.:
- 1.5SMC91CA-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC91CA-E3/57T.pdf
- Description:
- TVS DIODE 77.8VWM 125VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,278
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Product details
Overview
1.5SMC91CA-E3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 77.8 V stand-off voltage (VWM), 86.5–95.5 V breakdown voltage (VBR) at 1 mA, 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 signal lines, industrial I/O ports, and telecom interface protection.
For engineers reviewing the 1.5SMC91CA-E3/57T datasheet, 1.5SMC91CA-E3/57T pinout, 1.5SMC91CA-E3/57T application, or 1.5SMC91CA-E3/57T equivalent, key selection criteria include bidirectional clamping symmetry, low clamping ratio (VC/VBR ≈ 1.32), AEC-Q101 qualification eligibility (via HE3 suffix variants), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
The 1.5SMC91CA-E3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering symmetrical clamping in both polarities due to its bidirectional construction. Its 1500 W peak pulse power handling is validated under 10/1000 μs waveform with 0.01% duty cycle, and thermal performance is characterized by RθJA = 75 °C/W and RθJL = 15 °C/W.
It exhibits a temperature coefficient of VBR of +0.106 %/°C, confirming positive drift with junction temperature rise, and maintains ≤1.0 μA reverse leakage at VWM = 77.8 V. The device is rated for operation from –65 °C to +150 °C and meets UL 94 V-0 flammability requirements for its molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 77.8 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown) | 86.5–95.5 V at 1 mA - Avalanche onset range; ensures reliable triggering during transients without premature conduction |
| VC (Clamping) | 125 V at 12 A IPPM - Peak voltage seen by protected circuit during 10/1000 μs surge; determines downstream component stress |
| PPPM | 1500 W - Surge energy absorption capacity; enables protection against lightning-induced and inductive-switching transients |
| Package | SMC (DO-214AB) - Surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal requirement; supports automated assembly and high-power dissipation |
| Operating Temp | –65 °C to +150 °C - Enables deployment in under-hood automotive, industrial control cabinets, and outdoor telecom enclosures |
| Leakage (ID) | ≤1.0 μA at VWM - Minimal standby power loss and signal integrity impact in high-impedance circuits |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking - terminals are symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetric) | Transient conduction path | Both terminals serve identical roles; bidirectional clamping occurs regardless of voltage polarity applied across device |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-to-line) when properly mounted on 8 mm × 8 mm copper pads |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes voltage overshoot during clamping, reducing risk of damage to downstream ICs like CAN transceivers or ADC inputs |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT processes without pre-baking or special handling |
| AEC-Q101 qualification path | HE3/HM3 variants available - meets automotive-grade reliability requirements for engine control, ADAS sensors, and body electronics |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay environments exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role: Bidirectional TVS placed across sensor output and ground to clamp ±100 V transients. Use Value: Prevents latch-up or gate oxide damage in downstream op-amps and ADC drivers while maintaining <1 μA leakage at 77.8 V nominal supply. |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring induced surges and ESD events. IC Role / Device Role: Primary overvoltage clamp on each isolated input channel before optocoupler or Schmitt trigger input stage. Use Value: Ensures immunity to IEC 61000-4-4 fast transients (4 kV) and 61000-4-5 surge (2 kV line-earth) without degrading DC response or adding capacitance. |
| Telecom Line Interface | Consumer USB Port Protection |
Use Scenario: Safeguarding RS-485 transceiver bus lines in outdoor base stations subjected to lightning-induced common-mode surges. IC Role / Device Role: Bidirectional TVS connected between differential pair (A/B) and ground to suppress mode conversion transients. Use Value: Clamps common-mode spikes to <125 V within nanoseconds, preserving signal integrity and preventing transceiver latch-up during multi-kV events. |
Use Scenario: Adding secondary-level surge protection on USB 2.0 D+/D– lines in smart home hubs near AC mains entry points. IC Role / Device Role: Low-capacitance (<50 pF typical) bidirectional clamp limiting transient voltage to safe levels for USB PHY ICs. Use Value: Provides >1500 W surge margin while maintaining USB full-speed eye diagram compliance and avoiding data jitter from parasitic capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90CA | Lower PPPM (600 W), same VWM (77.2 V), SMB package (smaller thermal mass) | Less suitable for high-energy lightning surges; better fit for space-constrained consumer PCBs with lower surge exposure | Select when board area is critical and surge threat level is IEC 61000-4-4 Level 3 only |
| 1.5KE91CA | Same electrical specs but DO-201AE axial package; higher RθJA (~100 °C/W), not SMT-compatible | Requires through-hole assembly and manual rework; incompatible with automated production lines | Choose only for legacy designs or prototyping where SMT is unavailable |
Compared with 1.5SMC91CA-E3/57T, SMBJ90CA offers reduced footprint but sacrifices 60% peak power handling, while 1.5KE91CA retains identical clamping performance but eliminates SMT manufacturability - making 1.5SMC91CA-E3/57T the optimal balance of surge robustness, thermal capability, and production readiness.
Availability
1.5SMC91CA-E3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line driver circuits requiring stable component supply, RoHS-compliant sourcing, and long-term lifecycle continuity.
Supply support for 1.5SMC91CA-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 high-reliability diodes, MOSFETs, and passive components for demanding industrial and automotive applications.
The 1.5SMC Series was engineered specifically for surface-mount transient suppression in high-energy environments, emphasizing robust clamping, AEC-Q101 scalability, and compatibility with automated manufacturing processes.
FAQ
What is the clamping voltage of the 1.5SMC91CA-E3/57T at its rated peak pulse current?
The 1.5SMC91CA-E3/57T 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 defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The 1.5SMC91CA-E3/57T maintains this clamping performance across its full operating temperature range.
Is the 1.5SMC91CA-E3/57T suitable for automotive applications?
The 1.5SMC91CA-E3/57T itself is RoHS-compliant and commercial-grade; however, Vishay offers AEC-Q101 qualified variants under the HE3 and HM3 suffixes (e.g., 1.5SMC91CAHE3_A). While the 1.5SMC91CA-E3/57T shares identical electrical characteristics and package, formal automotive qualification requires the HE3/HM3 version. For non-safety-critical automotive subsystems, the 1.5SMC91CA-E3/57T is widely used - but design-in for ASIL-B or higher systems must specify the qualified variant.
What is the thermal resistance of the 1.5SMC91CA-E3/57T, and how does it affect layout?
The 1.5SMC91CA-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes FR-4 PCB with 1 oz copper. To maintain reliability under repetitive surges, designers must allocate adequate copper area and avoid narrow traces. The 1.5SMC91CA-E3/57T's RθJL of 15 °C/W further emphasizes the importance of direct thermal connection to large copper planes.
Does the 1.5SMC91CA-E3/57T have polarity markings, and how is it installed?
No - the 1.5SMC91CA-E3/57T is a bidirectional TVS diode and carries no cathode band or polarity marking. Its terminals are functionally identical, allowing installation in either orientation across the protected line and ground (or differential pair). This simplifies assembly and eliminates orientation-related solder defects. The 1.5SMC91CA-E3/57T achieves symmetrical clamping behavior in both directions due to its internal back-to-back diode structure.
What is the maximum reverse leakage current of the 1.5SMC91CA-E3/57T at its stand-off voltage?
The 1.5SMC91CA-E3/57T exhibits a maximum reverse leakage current (ID) of 1.0 μA at its rated stand-off voltage (VWM) of 77.8 V and ambient temperature of 25 °C. This ultra-low leakage ensures minimal power drain and negligible loading on high-impedance sensor outputs or reference lines. Leakage remains below 5 μA up to 125 °C, supporting stable operation in thermally demanding environments.
1.5SMC91CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
1.5SMC91CA-E3/57T FAQ
1.How can I place an order for 1.5SMC91CA-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC91CA-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 1.5SMC91CA-E3/57T reliable?
The price and inventory of 1.5SMC91CA-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 1.5SMC91CA-E3/57T is usually 5 days.
3.What payment methods are accepted for 1.5SMC91CA-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC91CA-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC91CA-E3/57T?
1.5SMC91CA-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC91CA-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 1.5SMC91CA-E3/57T?
For technical support, including 1.5SMC91CA-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC91CA-E3/57T requirements.
6.How does Aetrix verify that 1.5SMC91CA-E3/57T is sourced from the original manufacturer or authorized distributors?
All 1.5SMC91CA-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 1.5SMC91CA-E3/57T meets industry standards.
7.What is the process for return or replacement of 1.5SMC91CA-E3/57T?
All 1.5SMC91CA-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC91CA-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 1.5SMC91CA-E3/57T part is unused and in its original packaging.
Return procedure for 1.5SMC91CA-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC91CA-E3/57T Tags
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