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Vishay General Semiconductor - Diodes Division 1.5SMC43A-E3/9AT
- Part No.:
- 1.5SMC43A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC43A-E3/9AT.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,377
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Product details
Overview
1.5SMC43A-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 43 V breakdown voltage (VBR = 40.9–45.2 V at IT = 1.0 mA), 36.8 V stand-off voltage (VWM), clamps to ≤59.3 V at 25.3 A peak pulse current (IPPM), and delivers 1500 W peak pulse power with a 10/1000 μs waveform - ideal for safeguarding MOSFETs, ICs, and sensor interfaces against lightning-induced transients and inductive switching surges.
For engineers reviewing the 1.5SMC43A-E3/9AT datasheet, 1.5SMC43A-E3/9AT pinout, 1.5SMC43A-E3/9AT application, or 1.5SMC43A-E3/9AT equivalent, this device offers verified unidirectional clamping performance, RoHS-compliant SMC (DO-214AB) packaging, MSL Level 1 moisture sensitivity, and AEC-Q101 qualification readiness - critical for automotive power rail and industrial control board design validation.
Technical Context
The 1.5SMC43A-E3/9AT operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable reverse breakdown and low incremental surge resistance. Its clamping behavior is defined by a 10/1000 μs double-exponential pulse waveform, with thermal derating above 25 °C per Fig. 2 and peak pulse current validated on 8.0 mm × 8.0 mm copper pads.
It exhibits a maximum reverse leakage of 1.0 μA at VWM, a temperature coefficient of VBR of +0.101 %/°C, and a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W - confirming suitability for moderate-power transient suppression without active heatsinking in standard PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 40.9 V / 45.2 V at IT = 1.0 mA - defines reliable avalanche onset range for consistent clamping initiation |
| VWM | 36.8 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | ≤59.3 V at IPPM = 25.3 A - ensures protected circuitry sees no more than 59.3 V during worst-case 1500 W transient |
| PPPM | 1500 W (10/1000 μs) - sustains high-energy surges common in automotive load-dump and industrial motor switching |
| IPPM | 25.3 A - peak current capability directly tied to clamping voltage and system-level surge immunity margin |
| RθJA | 75 °C/W - enables thermal management estimation using standard FR-4 PCB copper pad layout (8.0 mm × 8.0 mm) |
| TJ max | +150 °C - supports operation in under-hood automotive and high-ambient industrial environments |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-002/JESD 22-B102 solderability standards. Polarity indicated by cathode band; unidirectional configuration only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to lower-potential side of protected line (e.g., ground or return path); determines unidirectional conduction direction |
| Cathode | Avalanche clamping node / Surge current sink | Connected to higher-potential side (e.g., VIN, signal line); absorbs transient energy into ground path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without cascaded stages |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity stress |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without pre-baking or special handling |
| RoHS-compliant, halogen-free option available | Fulfills environmental compliance requirements for automotive and industrial end-equipment certifications |
| AEC-Q101 qualification path | Base P/NHE3 suffix variant available - validates reliability for automotive power electronics applications |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load-dump transients (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges >40 V before reaching downstream regulators and microcontrollers. Use Value: Limits voltage excursion to ≤59.3 V during 25.3 A transients, preserving 36 V-rated input stages and avoiding latch-up or gate oxide damage. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation systems. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt fast-rising transients (<1 ns rise time) before reaching precision op-amps or ADC front-ends. Use Value: Sub-100 ns response time and ≤1.0 μA leakage at 36.8 V ensure signal integrity remains uncompromised during normal operation and transient events. |
| Telecom Line Card Surge Protection | Consumer Power Adapter Input Stage |
Use Scenario: Safeguarding PoE-powered Ethernet ports against lightning-induced surges on data pairs and DC supply lines. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices on each conductor to suppress common-mode and differential-mode transients up to 1500 W. Use Value: 1500 W rating and DO-214AB mechanical robustness allow single-device protection per line without parallel stacking or external spark gaps. |
Use Scenario: Secondary-side overvoltage clamping in AC/DC adapters to prevent damage during output short-circuit recovery or feedback loop failure. IC Role / Device Role / Timing Role: TVS connected across output capacitor to clamp regulator overshoot and rectifier reverse recovery spikes. Use Value: 36.8 V stand-off accommodates nominal 36 V output rails while clamping excursions to ≤59.3 V - within safe margin of 63 V-rated electrolytic capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A-E3/52T (Vishay) | Same VBR/VWM/VC specs but SMB (DO-214AA) package - 30 % smaller footprint, 1000 W rating (vs. 1500 W) | Limited to lower-energy transients (IEC 61000-4-5 Level 3); unsuitable for automotive load-dump where 1500 W is mandated | Select when board space is constrained and surge threat level is ≤1 kV/2 kA; verify thermal margin with RθJA = 85 °C/W |
| 1.5KE43A (ON Semiconductor) | Through-hole DO-201 package; identical electrical specs but higher RθJA (60 °C/W on infinite heatsink only), no MSL rating | Requires wave soldering or hand-soldering; not compatible with automated SMT lines or reflow processes | Choose only for legacy through-hole designs or prototyping where SMT placement is unavailable |
Compared with SMBJ43A-E3/52T, the 1.5SMC43A-E3/9AT provides 50 % higher peak pulse power and superior thermal performance on standard PCB pads; versus 1.5KE43A, it enables full SMT automation, MSL-1 compliance, and tighter board-level integration without sacrificing clamping accuracy or reliability.
Availability
1.5SMC43A-E3/9AT is available at Aetrix Electronics and suitable for automotive power distribution modules, industrial PLC I/O cards, telecom line interface units, and consumer power adapter designs requiring stable component supply and long-term production continuity.
Supply support for 1.5SMC43A-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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The 1.5SMC Series was developed for high-power surface-mount transient suppression in automotive, industrial, and communications infrastructure - balancing ruggedness, compactness, and repeatable clamping behavior across temperature and lifetime.
FAQ
What is the clamping voltage of the 1.5SMC43A-E3/9AT at its rated peak pulse current?
The 1.5SMC43A-E3/9AT clamps to a maximum of 59.3 V at its specified peak pulse current of 25.3 A (10/1000 μs waveform). This value is measured under standardized test conditions with the device mounted on 8.0 mm × 8.0 mm copper pads per JEDEC guidelines, ensuring reproducible protection performance in real-world PCB layouts.
Is the 1.5SMC43A-E3/9AT RoHS-compliant and lead-free?
Yes, the 1.5SMC43A-E3/9AT carries the "E3" suffix, indicating full RoHS compliance and lead-free construction per EU Directive 2011/65/EU. Its matte tin-plated terminals meet J-STD-002 and JESD 22-B102 solderability standards, and it passes JESD 201 Class 2 whisker testing for long-term interconnect reliability.
Does the 1.5SMC43A-E3/9AT have AEC-Q101 qualification?
The base 1.5SMC43A-E3/9AT is commercial-grade and not AEC-Q101 qualified; however, Vishay offers the pin-compatible 1.5SMC43AHE3_A variant (with HE3 suffix) that is fully AEC-Q101 qualified for automotive applications. Both share identical electrical characteristics and SMC package dimensions.
What is the maximum operating temperature for the 1.5SMC43A-E3/9AT?
The 1.5SMC43A-E3/9AT has a maximum junction temperature (TJ) of +150 °C and an operating ambient temperature range of –65 °C to +150 °C. Its thermal resistance (RθJA = 75 °C/W) allows direct calculation of allowable power dissipation based on PCB copper area and airflow conditions.
How does the 1.5SMC43A-E3/9AT differ from bidirectional TVS diodes like 1.5SMC43CA?
The 1.5SMC43A-E3/9AT is unidirectional and functions only in reverse-bias avalanche mode, making it suitable for DC power line protection where polarity is fixed. In contrast, 1.5SMC43CA is bidirectional with symmetrical clamping in both directions - used for AC lines or data signals with no inherent polarity. Their VBR and VC values differ accordingly, and they are not interchangeable without circuit redesign.
1.5SMC43A-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):
- 36.8V
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.3V
- Current - Peak Pulse (10/1000µs):
- 25.3A
- 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)
1.5SMC43A-E3/9AT FAQ
1.How can I place an order for 1.5SMC43A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC43A-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 1.5SMC43A-E3/9AT reliable?
The price and inventory of 1.5SMC43A-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 1.5SMC43A-E3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC43A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC43A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC43A-E3/9AT?
1.5SMC43A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC43A-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 1.5SMC43A-E3/9AT?
For technical support, including 1.5SMC43A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC43A-E3/9AT requirements.
6.How does Aetrix verify that 1.5SMC43A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC43A-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 1.5SMC43A-E3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC43A-E3/9AT?
All 1.5SMC43A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC43A-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 1.5SMC43A-E3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC43A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC43A-E3/9AT Tags
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