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Vishay General Semiconductor - Diodes Division 1.5SMC91CA-E3/9AT
- Part No.:
- 1.5SMC91CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC91CA-E3/9AT.pdf
- Description:
- TVS DIODE 77.8VWM 125VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,394
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Product details
Overview
1.5SMC91CA-E3/9AT from Vishay General Semiconductor is a bidirectional 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), 1500 W peak pulse power (10/1000 µs), and clamps transients to ≤125 V at 12 A, making it suitable for automotive power rail and industrial sensor interface protection.
For engineers reviewing the 1.5SMC91CA-E3/9AT datasheet, 1.5SMC91CA-E3/9AT pinout, 1.5SMC91CA-E3/9AT application, or 1.5SMC91CA-E3/9AT equivalent, key selection criteria include bidirectional clamping capability, SMC (DO-214AB) package compatibility with automated assembly, AEC-Q101 qualification status, and thermal performance under repetitive surge conditions.
Technical Context
This device operates as a voltage-clamped crowbar during ESD or lightning-induced surges, leveraging an avalanche junction to divert current away from protected circuitry. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity-dependent design constraints in AC-coupled or floating signal paths.
With a low incremental surge resistance and fast response time (<1 ns), the 1.5SMC91CA-E3/9AT maintains stable clamping across surge amplitudes up to 12 A (IPPM), while its 75 °C/W junction-to-ambient thermal resistance supports operation up to +150 °C junction temperature under defined PCB pad layout (8.0 mm × 8.0 mm copper).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 86.5 V / 95.5 V at 1 mA - defines reliable avalanche initiation threshold for bidirectional surge suppression |
| VWM | 77.8 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPPM | 125 V at 12 A (10/1000 µs) - peak clamped voltage seen by downstream circuitry during worst-case surge |
| PPPM | 1500 W - peak transient power handling capacity, enabling protection against IEC 61000-4-5 Level 4 surges |
| IPPM | 12 A - maximum non-repetitive peak pulse current supported without degradation |
| TJ max | +150 °C - maximum junction temperature rating, supporting under-hood automotive and industrial ambient environments |
| Package | SMC (DO-214AB) - surface-mount package with 3.2 mm × 6.2 mm footprint, compatible with standard reflow profiles and J-STD-020 MSL level 1 |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance. Bidirectional construction means no polarity marking - both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Electrically interchangeable terminal; connects to either side of protected line without polarity concern |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically interchangeable terminal; forms symmetrical clamping path across protected node |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or floating power rails without external polarity management |
| 1500 W peak pulse power | Supports IEC 61000-4-5 surge immunity up to 4 kV (line-earth) with appropriate series impedance |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes voltage overshoot during surge events, reducing stress on downstream MOSFETs or ICs |
| AEC-Q101 qualified option | Available in HE3/HM3 variants - this part (E3/9AT) is RoHS-compliant commercial grade; automotive qualification requires HE3 suffix |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, simplifying SMT manufacturing flow |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed between power rail and ground, activated within <1 ns of overvoltage event. Use Value: Limits transient voltage to ≤125 V, preventing damage to 36 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA loops) in factory automation sensors exposed to ESD and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional shunt protector across signal and return lines, suppressing ±2 kV contact ESD (IEC 61000-4-2). Use Value: Maintains signal integrity by clamping transients below 125 V while adding <1 pF capacitance - negligible impact on loop bandwidth. |
| Telecom Line Interface Protection | Consumer USB Port Surge Suppression |
|
Use Scenario: Shielding Ethernet PHY interfaces (e.g., PoE-powered devices) from lightning-induced surges on data pairs. IC Role / Device Role / Timing Role: Bidirectional TVS connected line-to-line and line-to-ground in common-mode configuration. Use Value: Handles 10/1000 µs surges up to 12 A while preserving signal rise time due to sub-nanosecond response. |
Use Scenario: Adding secondary surge protection on USB VBUS lines in portable chargers and docking stations. IC Role / Device Role / Timing Role: Clamp diode placed between VBUS and GND, triggered only during overvoltage events beyond 77.8 V. Use Value: Complements primary protection (e.g., polyfuse + MOV) with precise, low-leakage clamping at 1 µA max @ 77.8 V. |
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 peak power (600 W), same VBR range (85.5–94.5 V), SMB package (smaller footprint, higher RθJA) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or IEC 61000-4-5 Level 4 | Select when board space is constrained and surge energy is ≤600 W; verify thermal derating on small pads |
| 1.5KE91CA | Same electrical specs but axial DO-15 package; higher RθJA (~100 °C/W), not SMT-compatible | Requires through-hole assembly; incompatible with high-speed automated placement and reflow processes | Choose only for legacy through-hole designs or prototyping where SMT is unavailable |
Compared with SMBJ90CA and 1.5KE91CA, the 1.5SMC91CA-E3/9AT delivers 2.5× higher surge power handling in an SMT-optimized package, enabling robust protection in space-constrained automotive and industrial PCBs without sacrificing manufacturability.
Availability
1.5SMC91CA-E3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom line protection, and consumer power port hardening requiring stable component supply and full traceability.
Supply support for 1.5SMC91CA-E3/9AT 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, automotive qualification, and high-power handling.
The 1.5SMC Series was developed for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where 1500 W surge capability and AEC-Q101 compliance are critical.
FAQ
What is the breakdown voltage tolerance for 1.5SMC91CA-E3/9AT?
The 1.5SMC91CA-E3/9AT has a specified breakdown voltage range of 86.5 V to 95.5 V at 1 mA test current, representing a ±5% tolerance around the nominal 91 V rating. This tight VBR window ensures consistent clamping behavior across production lots and supports predictable system-level surge margin analysis.
Is 1.5SMC91CA-E3/9AT RoHS-compliant and halogen-free?
Yes, the 1.5SMC91CA-E3/9AT carries the "E3" suffix, indicating it is RoHS-compliant per EU Directive 2011/65/EU and meets Vishay's commercial-grade material requirements. It is not halogen-free - that designation requires the "M3" suffix (e.g., 1.5SMC91CA-M3/9AT).
Does 1.5SMC91CA-E3/9AT have AEC-Q101 qualification?
No, the 1.5SMC91CA-E3/9AT is a commercial-grade part. AEC-Q101 qualification is available only with the "HE3" or "HM3" suffixes (e.g., 1.5SMC91CAHE3_A/I). The E3 variant meets all electrical and mechanical specs but lacks the extended temperature cycling, HTRB, and ESD validation required for automotive qualification.
What is the maximum clamping voltage of 1.5SMC91CA-E3/9AT under surge conditions?
The 1.5SMC91CA-E3/9AT clamps to a maximum of 125 V when subjected to its rated 12 A peak pulse current (10/1000 µs waveform). This VC value is guaranteed across temperature and lifetime, ensuring downstream components see no more than 125 V during standardized surge events.
Can 1.5SMC91CA-E3/9AT be used in bidirectional signal lines like RS-485?
Yes, the 1.5SMC91CA-E3/9AT is explicitly designed for bidirectional applications - its CA suffix denotes symmetrical clamping in both directions. It is commonly deployed across RS-485 differential pairs (A/B lines) or CAN bus lines where polarity-independent protection is essential.
1.5SMC91CA-E3/9AT 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:
- -
- 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-E3/9AT FAQ
1.How can I place an order for 1.5SMC91CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC91CA-E3/9AT 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 1.5SMC91CA-E3/9AT reliable?
The price and inventory of 1.5SMC91CA-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC91CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC91CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC91CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC91CA-E3/9AT?
1.5SMC91CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC91CA-E3/9AT 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 1.5SMC91CA-E3/9AT?
For technical support, including 1.5SMC91CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC91CA-E3/9AT requirements.
6.How does Aetrix verify that 1.5SMC91CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC91CA-E3/9AT 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 1.5SMC91CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC91CA-E3/9AT?
All 1.5SMC91CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC91CA-E3/9AT, 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 1.5SMC91CA-E3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC91CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC91CA-E3/9AT Tags
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