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Vishay General Semiconductor - Diodes Division 1.5SMC91AHE3/9AT
- Part No.:
- 1.5SMC91AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC91AHE3/9AT.pdf
- Description:
- TVS DIODE 77.8VWM 125VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,037
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Product details
Overview
1.5SMC91AHE3/9AT from Vishay General Semiconductor is a unidirectional 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 IT = 1.0 mA), 125 V maximum clamping voltage (VC) at 12.0 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive ECUs, industrial sensor interfaces, and DC power rail protection.
For engineers reviewing the 1.5SMC91AHE3/9AT datasheet, 1.5SMC91AHE3/9AT pinout, 1.5SMC91AHE3/9AT application, or 1.5SMC91AHE3/9AT equivalent, this device delivers AEC-Q101 qualification, low incremental surge resistance, fast response time (<1 ns), and SMC (DO-214AB) surface-mount packaging optimized for automated placement and high-reliability environments.
Technical Context
The 1.5SMC91AHE3/9AT operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold to clamp transients. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 μA at VWM = 77.8 V), while thermal resistance RθJA = 75 °C/W supports operation up to TJ = 150 °C.
It complies with JEDEC J-STD-020 MSL Level 1 (260 °C peak reflow), uses matte tin-plated leads solderable per J-STD-002, and meets UL 94 V-0 flammability requirements. The cathode band denotes polarity, and it is rated for non-repetitive 8.3 ms half-sine surge current up to 200 A (IFSM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 86.5 V / 95.5 V at 1.0 mA - defines precise avalanche initiation window for repeatable clamping behavior |
| VWM | 77.8 V - maximum continuous reverse operating voltage before leakage rises significantly |
| VC @ IPPM | 125 V at 12.0 A - clamped voltage during 10/1000 μs transient, limiting downstream stress |
| PPPM | 1500 W - peak pulse power handling capability under standardized surge conditions |
| IPPM | 12.0 A - maximum non-repetitive peak pulse current supported at VC = 125 V |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, critical for derating above 25 °C |
| TJ max | +150 °C - maximum junction temperature enabling use in under-hood automotive and industrial enclosures |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads; cathode indicated by a band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side in unidirectional configuration; carries forward surge current up to 200 A |
| Cathode | Avalanche clamping terminal | Marked with band; referenced to system ground or protected line; conducts reverse transient energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HAST, and mechanical shock per AEC standard |
| 1500 W peak pulse power | Withstands severe lightning-induced surges and inductive switching spikes without degradation |
| Glass passivated junction | Ensures long-term stability of VBR, low leakage, and resistance to humidity and contamination |
| MSL Level 1 moisture sensitivity | Enables direct placement into high-temperature reflow without baking or special handling |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation material required for safety-critical industrial and automotive applications |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed control modules from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp >100 V spikes within nanoseconds. Use Value: Limits voltage seen by MCU power supply and CAN transceivers to ≤125 V, preventing latch-up or permanent damage. |
Use Scenario: Safeguarding analog outputs (4–20 mA) and digital I/O of PLC analog modules against ESD and field wiring faults. IC Role / Device Role / Timing Role: Standoff protection on signal lines upstream of op-amps or ADC inputs. Use Value: Clamps fast-rising transients to <125 V while maintaining <1.0 μA leakage at 77.8 V, preserving signal integrity. |
| DC-DC Converter Input Stage | Telecom Line Card Surge Suppression |
Use Scenario: Input-side protection for isolated buck-boost converters in railway signaling equipment. IC Role / Device Role / Timing Role: Primary overvoltage clamp ahead of input filter and controller IC. Use Value: Absorbs 1500 W pulses without failure, enabling compliance with IEC 61000-4-5 Level 4 (4 kV) |
Use Scenario: Secondary-level surge suppression on Ethernet PHY power rails and auxiliary bias supplies. IC Role / Device Role / Timing Role: Fast-response clamping element parallel to LDO regulators feeding PHY ICs. Use Value: Sub-1 ns response ensures clamping occurs before regulator overvoltage shutdown thresholds are exceeded. |
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 | Lower PPPM = 600 W; same VBR range (85.5–94.5 V); SMB package (smaller footprint, higher RθJA) | Not AEC-Q101 qualified; limited to commercial-grade consumer/industrial use | Select when board space is constrained and surge energy is ≤600 W; verify thermal margin due to RθJA ≈ 110 °C/W |
| 1.5KE91A | Through-hole TO-204AA (DO-41); identical electrical specs but incompatible mounting and lower automation compatibility | Lacks MSL Level 1 rating; not suitable for lead-free reflow or high-volume SMT lines | Choose only for legacy through-hole designs or prototyping where rework flexibility outweighs production efficiency |
Compared with SMBJ90A and 1.5KE91A, the 1.5SMC91AHE3/9AT uniquely combines AEC-Q101 qualification, 1500 W surge capacity, SMC package manufacturability, and UL 94 V-0 compliance - making it the preferred choice for automotive and high-reliability industrial SMT production.
Availability
1.5SMC91AHE3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom infrastructure requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1.5SMC91AHE3/9AT 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, precision, and application-specific validation.
The 1.5SMC Series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure modes must be mitigated without compromising signal fidelity or thermal performance.
FAQ
What is the breakdown voltage tolerance of the 1.5SMC91AHE3/9AT?
The 1.5SMC91AHE3/9AT has a breakdown voltage VBR specified from 86.5 V to 95.5 V at test current IT = 1.0 mA, representing a ±5% tolerance around the nominal 91 V rating. This tight tolerance ensures consistent clamping behavior across production lots and enables predictable system-level overvoltage margin design without additional derating overhead.
Is the 1.5SMC91AHE3/9AT suitable for automotive applications?
Yes, the 1.5SMC91AHE3/9AT is AEC-Q101 qualified and explicitly designated for automotive use via the "HE3" suffix. It undergoes rigorous stress testing including temperature cycling, highly accelerated stress testing (HAST), and mechanical shock per AEC-Q101 Rev D, making it appropriate for engine control units, body electronics, and ADAS power domains where reliability under thermal and vibration stress is mandatory.
What does the "9AT" suffix indicate in 1.5SMC91AHE3/9AT?
The "9AT" suffix denotes packaging: 13-inch diameter plastic tape and reel containing 3500 units. This format supports high-volume automated pick-and-place assembly and is compatible with industry-standard SMT feeders. The "HE3" portion confirms RoHS-compliant construction and AEC-Q101 qualification, distinguishing it from commercial-grade E3 variants.
How does the 1.5SMC91AHE3/9AT compare to bidirectional TVS diodes like 1.5SMC91CA?
The 1.5SMC91AHE3/9AT is unidirectional and intended for DC-biased lines where polarity is fixed (e.g., +12 V rail to ground). In contrast, 1.5SMC91CA is bidirectional and used on AC or floating lines (e.g., RS-485 differential pairs). Their VBR, VC, and PPPM are matched, but the 1.5SMC91AHE3/9AT offers lower leakage (<1.0 μA vs. ~5 μA for CA types) and is optimized for asymmetric voltage threats.
What is the maximum clamping voltage of the 1.5SMC91AHE3/9AT under surge conditions?
The 1.5SMC91AHE3/9AT exhibits a maximum clamping voltage VC of 125 V at IPPM = 12.0 A with a 10/1000 μs waveform. This value is guaranteed across temperature and represents the peak voltage imposed on protected circuitry during worst-case transient events - critical for ensuring downstream ICs remain within absolute maximum ratings during surge exposure.
1.5SMC91AHE3/9AT 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:
- 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)
1.5SMC91AHE3/9AT FAQ
1.How can I place an order for 1.5SMC91AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC91AHE3/9AT 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 1.5SMC91AHE3/9AT reliable?
The price and inventory of 1.5SMC91AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC91AHE3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC91AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC91AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC91AHE3/9AT?
1.5SMC91AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC91AHE3/9AT 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 1.5SMC91AHE3/9AT?
For technical support, including 1.5SMC91AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC91AHE3/9AT requirements.
6.How does Aetrix verify that 1.5SMC91AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC91AHE3/9AT 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 1.5SMC91AHE3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC91AHE3/9AT?
All 1.5SMC91AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC91AHE3/9AT, 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 1.5SMC91AHE3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC91AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC91AHE3/9AT Tags
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