My Inquiry
My Account
Vishay General Semiconductor - Diodes Division 1.5SMC91A-E3/9AT
- Part No.:
- 1.5SMC91A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC91A-E3/9AT.pdf
- Description:
- TVS DIODE 77.8VWM 125VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,965
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5SMC91A-E3/9AT 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 IT = 1.0 mA), 77.8 V stand-off voltage (VWM), 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 sensor interfaces and industrial DC power rails.
For engineers reviewing the 1.5SMC91A-E3/9AT datasheet, 1.5SMC91A-E3/9AT pinout, 1.5SMC91A-E3/9AT application, or 1.5SMC91A-E3/9AT equivalent, key selection considerations include unidirectional polarity, SMC (DO-214AB) package thermal performance (RθJA = 75 °C/W), AEC-Q101 qualification eligibility (via HE3 suffix), and clamping behavior under repetitive surge conditions.
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 transient energy to ground while limiting downstream voltage to ≤125 V. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ns).
The device is rated for 1500 W peak pulse power (10/1000 µs), 200 A non-repetitive forward surge current (8.3 ms half-sine), and operates across –65 °C to +150 °C junction temperature range. Thermal resistance from junction to ambient is 75 °C/W on standard 8.0 mm × 8.0 mm copper pads, supporting reliable operation in compact, thermally constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 86.5 V / 95.5 V at 1.0 mA test current - defines precise voltage threshold where avalanche conduction begins |
| VWM | 77.8 V - maximum continuous reverse operating voltage before significant leakage occurs |
| VC @ IPPM | 125 V at 12.0 A - clamping voltage during 1500 W transient event; determines protected circuit's worst-case overvoltage |
| PPPM | 1500 W - peak pulse power handling capability with 10/1000 µs waveform; validates surge immunity per IEC 61000-4-5 |
| IPPM | 12.0 A - peak pulse current corresponding to VC = 125 V; used to size PCB trace and grounding paths |
| RθJA | 75 °C/W - thermal resistance junction-to-ambient on standard pad layout; informs derating above 25 °C ambient |
| TJ max | +150 °C - maximum allowable junction temperature; enables use in under-hood automotive environments |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. Polarity indicated by cathode band; unidirectional configuration requires correct orientation relative to protected line polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction; connected to lower-potential side of protected line | Used only in forward-biased surge events (e.g., reverse polarity protection); not active during normal reverse-biased TVS operation |
| Cathode | Current exit terminal during reverse avalanche clamping; connected to protected line | Primary connection point for transient energy diversion; must route to low-inductance ground plane |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Validates compliance with Level 4 IEC 61000-4-5 surge immunity requirements for industrial and automotive systems |
| Glass-passivated chip junction | Ensures long-term stability of VBR and leakage current across temperature and humidity stress |
| MSL Level 1 (J-STD-020), 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture-related popcorning or delamination |
| AEC-Q101 qualification option (HE3 suffix) | Enables direct use in automotive powertrain and body electronics requiring qualified component traceability |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving system-level ESD robustness |
Applications
| Automotive Sensor Interface Protection | Industrial DC Power Rail Clamping |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between signal line and chassis ground, activated within <1 ns upon exceeding VWM. Use Value: Limits transient voltage to ≤125 V, preventing damage to 5 V or 12 V interface ICs while maintaining signal integrity during normal operation. |
Use Scenario: Safeguarding 24 V industrial PLC I/O modules against surges induced by relay coil de-energization or motor drive switching. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V supply rail, coordinated with upstream fuses and downstream LDOs. Use Value: Absorbs up to 1500 W of transient energy without failure, enabling system-level compliance with IEC 61000-4-4/5 and reducing need for redundant protection stages. |
| Telecom Line Surge Suppression | Consumer Power Adapter Input Protection |
|
Use Scenario: Secondary protection on PoE-powered Ethernet ports (e.g., IEEE 802.3af/at) exposed to lightning-induced surges on data pairs. IC Role / Device Role / Timing Role: Back-to-back unidirectional TVS pair (with CA variant) or single-device clamp referenced to isolated ground plane. Use Value: Clamps common-mode surges to <130 V, preserving PHY IC integrity while meeting UL 60950-1 insulation coordination requirements. |
Use Scenario: Input-stage transient suppression in AC/DC adapters for smart home devices, guarding against mains-borne surges and ESD coupling. IC Role / Device Role / Timing Role: First-line defense before bridge rectifier and bulk capacitor; absorbs differential-mode transients on live/neutral lines. Use Value: Withstands 200 A 8.3 ms surge (IFSM), ensuring reliability during repeated plug-in events and brownout recovery cycles. |
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 (Bourns) | Same VWM (77.5 V), slightly lower VC (123 V @ 12.1 A), SMB package (smaller footprint, higher RθJA = 85 °C/W) | Preferred where board space is critical but thermal margin allows reduced pad area | Select SMBJ90A if layout constraints prohibit SMC pad dimensions and peak power demand remains ≤1500 W |
| 1.5KE91A (Vishay, through-hole) | Identical electrical specs (VBR, VWM, VC, PPPM), axial DO-201AE package with higher RθJA (60 °C/W on larger pads) | Suitable for prototyping, legacy designs, or high-reliability through-hole assemblies where automated SMT is unavailable | Choose 1.5KE91A for manual assembly, high-vibration environments requiring mechanical anchoring, or mixed-technology boards |
Compared with SMBJ90A, the 1.5SMC91A-E3/9AT offers superior thermal dissipation in SMT layouts due to lower RθJA; versus 1.5KE91A, it enables higher-density automation but requires verified SMT process control for MSL-1 compliance.
Availability
1.5SMC91A-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial DC power rails, telecom line surge suppression, and consumer power adapter input protection requiring stable component supply and RoHS-compliant sourcing.
Supply support for 1.5SMC91A-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The 1.5SMC Series targets high-energy transient suppression in space-constrained, high-reliability applications - engineered for automotive, industrial, and telecom systems demanding AEC-Q101 readiness and robust surge immunity.
FAQ
What is the maximum clamping voltage of the 1.5SMC91A-E3/9AT under a 1500 W transient?
The 1.5SMC91A-E3/9AT exhibits a maximum clamping voltage (VC) of 125 V at 12.0 A peak pulse current, which corresponds to the 1500 W 10/1000 µs waveform. This value is measured under standardized test conditions with specified PCB pad layout (8.0 mm × 8.0 mm copper) and represents the upper bound of voltage seen by downstream circuitry during surge events. The 1.5SMC91A-E3/9AT maintains this clamping performance across its full operating temperature range.
Is the 1.5SMC91A-E3/9AT suitable for automotive applications?
The 1.5SMC91A-E3/9AT itself is RoHS-compliant and commercial-grade; however, Vishay offers AEC-Q101-qualified variants using the HE3 suffix (e.g., 1.5SMC91AHE3_A). While the 1.5SMC91A-E3/9AT shares identical electrical and thermal characteristics, automotive deployment requires verification of qualification status via ordering code. The 1.5SMC91A-E3/9AT is commonly used in non-safety-critical automotive subsystems where full AEC-Q101 documentation is not mandated.
How does the 1.5SMC91A-E3/9AT differ from bidirectional TVS diodes like 1.5SMC91CA?
The 1.5SMC91A-E3/9AT is unidirectional and features polarity marking (cathode band), allowing it to conduct only in reverse avalanche mode - ideal for DC lines with defined polarity. In contrast, 1.5SMC91CA is bidirectional, symmetric in both directions, and lacks polarity marking; it is suited for AC lines or differential signal pairs. Electrical parameters (VBR, VC, PPPM) are matched, but circuit integration and layout routing differ significantly between the two variants.
What is the thermal resistance of the 1.5SMC91A-E3/9AT, and how does it affect layout design?
The 1.5SMC91A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value directly impacts power derating: above 25 °C ambient, allowable pulse repetition rate decreases per Figure 2 in the datasheet. Layout must replicate the specified pad geometry and ensure uninterrupted thermal vias to inner ground planes to maintain this RθJA and avoid thermal runaway during repetitive surges.
Does the 1.5SMC91A-E3/9AT require additional series impedance for optimal protection?
Yes - the 1.5SMC91A-E3/9AT functions as a shunt device and relies on upstream series impedance (e.g., ferrite bead, resistor, or trace inductance) to limit peak current during fast transients and reduce stress on the TVS. Without such impedance, extremely fast edges (<1 ns) may cause localized voltage overshoot before the diode fully clamps. System-level validation per IEC 61000-4-2/4-4 is recommended to confirm coordination between the 1.5SMC91A-E3/9AT and its associated current-limiting elements.
1.5SMC91A-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:
- 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-E3/9AT FAQ
1.How can I place an order for 1.5SMC91A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC91A-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 1.5SMC91A-E3/9AT reliable?
The price and inventory of 1.5SMC91A-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 1.5SMC91A-E3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC91A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC91A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC91A-E3/9AT?
1.5SMC91A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC91A-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 1.5SMC91A-E3/9AT?
For technical support, including 1.5SMC91A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC91A-E3/9AT requirements.
6.How does Aetrix verify that 1.5SMC91A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC91A-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 1.5SMC91A-E3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC91A-E3/9AT?
All 1.5SMC91A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC91A-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 1.5SMC91A-E3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC91A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC91A-E3/9AT Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
