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Vishay General Semiconductor - Diodes Division SMCJ45-E3/9AT
- Part No.:
- SMCJ45-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45-E3/9AT.pdf
- Description:
- TVS DIODE 45VWM 80.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,500
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Product details
Overview
SMCJ45-E3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR), 72.7 V clamping voltage (VC) at 20.6 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ45-E3/9AT datasheet, SMCJ45-E3/9AT pinout, SMCJ45-E3/9AT application, or SMCJ45-E3/9AT equivalent, key selection criteria include clamping performance under 20.6 A surge, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification, RoHS compliance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: it remains high-impedance below 45 V (VWM), breaks down sharply between 50.0 V and 55.3 V (VBR @ 1 mA), and clamps transients to ≤72.7 V at 20.6 A (IPPM). Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1 ns).
Thermally, it sustains 150 °C maximum junction temperature (TJ max), with RθJL = 15 °C/W enabling effective heat transfer to PCB leads. The device meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin. |
| VBR min/max | 50.0 V / 55.3 V at 1 mA - Tight breakdown window ensures predictable turn-on during transients. |
| VC @ IPPM | 72.7 V at 20.6 A - Clamping voltage limits downstream IC stress during 10/1000 µs surges. |
| PPPM | 1500 W - Peak transient energy handling capacity with standard lightning/surge waveform. |
| ID @ VWM | ≤1.0 µA - Ultra-low leakage preserves battery life and signal integrity in always-on circuits. |
| TJ max | +150 °C - Enables operation in under-hood automotive and industrial environments. |
| RθJA | 75 °C/W - Requires minimum 8.0 mm × 8.0 mm copper pad per terminal for thermal derating compliance. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity marked by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential point; forms shunt path during overvoltage events. |
| Cathode | Protected line input | Connected to the line being protected (e.g., 48 V bus); clamps to anode when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power supplies. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity stress. |
| MSL Level 1 rating | Allows unlimited floor life and reflow up to 260 °C peak without moisture-induced failure. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a). |
| RoHS-compliant (E3 suffix) | Meets EU Directive 2011/65/EU; lead-free matte tin plating compatible with Pb-free assembly. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump and alternator transients per ISO 16750-2. IC Role / Device Role / Timing Role: Shunt TVS placed upstream of DC-DC converter input to clamp spikes to <73 V. Use Value: Prevents damage to buck controller ICs rated for 60 V absolute maximum input. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional-capable protection (though SMCJ45-E3/9AT is unidirectional, used with series resistor for signal line polarity management). Use Value: Limits induced ESD/lightning surges to <73 V, preserving 12-bit ADC accuracy and avoiding latch-up. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drive Inputs |
Use Scenario: Guarding PoE-powered equipment front-end against Ethernet-coupled surges and hot-swap transients. IC Role / Device Role / Timing Role: Unidirectional TVS on +48 V DC feed, referenced to system ground. Use Value: Withstands 1500 W peak pulses while maintaining <1 µA leakage to avoid standby current drain. |
Use Scenario: Shielding BLDC motor driver power stages from inductive kickback during PWM switching. IC Role / Device Role / Timing Role: Clamp across H-bridge high-side FET source-to-ground to absorb flyback energy. Use Value: 72.7 V clamping prevents gate oxide rupture in 60 V-rated MOSFETs during 20.6 A surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/57T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (~110 °C/W). | Suitable only for lower-energy transients; requires tighter thermal layout due to reduced power handling. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-5 Level 2. |
| SMCJ45AHE3/9AT | Identical electrical specs but AEC-Q101 qualified (HE3 suffix vs E3); same DO-214AB package and marking. | Required for automotive OEM designs requiring full AEC-Q101 documentation and traceability. | Choose SMCJ45AHE3/9AT for Tier-1 automotive programs; SMCJ45-E3/9AT suffices for industrial/commercial use. |
Compared with SMAJ45A-E3/57T, SMCJ45-E3/9AT delivers 3.75× higher surge power handling and superior thermal dissipation; versus SMCJ45AHE3/9AT, it offers identical protection performance at lower cost where AEC-Q101 certification is not mandated.
Availability
SMCJ45-E3/9AT is available at Aetrix Electronics and suitable for automotive power systems, industrial sensor interfaces, telecom DC feeds, and consumer appliance motor drives requiring stable component supply and consistent surge immunity performance.
Supply support for SMCJ45-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 power MOSFETs with emphasis on reliability and ruggedness.
The SMCJ series was developed for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where sustained 1500 W surge capability and AEC-Q101 compliance are critical.
FAQ
What is the clamping voltage of SMCJ45-E3/9AT at its rated peak pulse current?
The SMCJ45-E3/9AT clamps to a maximum of 72.7 V at its specified peak pulse current of 20.6 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see controlled overvoltage stress during surge events. The SMCJ45-E3/9AT maintains this clamping performance across its operational temperature range.
Is SMCJ45-E3/9AT suitable for automotive applications?
Yes, SMCJ45-E3/9AT is RoHS-compliant and manufactured to Vishay's commercial-grade specifications, but it is not AEC-Q101 qualified. For automotive use, the HE3-suffix variant (e.g., SMCJ45AHE3/9AT) is required. The SMCJ45-E3/9AT remains appropriate for non-safety-critical automotive aftermarket or industrial transport systems where full AEC-Q101 validation is not mandated.
What does the "E3/9AT" suffix indicate in SMCJ45-E3/9AT?
The "E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting JESD 201 Class 1A whisker resistance. The "9AT" specifies packaging: 3500 units per 13-inch plastic tape-and-reel, optimized for high-volume SMT placement. This differs from "57T", which uses 7-inch reels with 850-unit quantities.
How does SMCJ45-E3/9AT compare to bi-directional variants like SMCJ45CA?
SMCJ45-E3/9AT is unidirectional and intended for DC line protection with defined polarity; SMCJ45CA is bi-directional and suited for AC or floating signal lines. The SMCJ45-E3/9AT has a cathode band marking, while SMCJ45CA has no polarity marking. Both share identical VWM (45 V), VBR (50.0–55.3 V), and VC (72.7 V), but SMCJ45-E3/9AT supports forward conduction only in one direction.
What PCB layout guidance applies to SMCJ45-E3/9AT for optimal thermal performance?
For reliable operation at full 1500 W rating, SMCJ45-E3/9AT must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, per Vishay's datasheet Fig. 2 derating curve. Thermal vias under pads and internal ground planes further reduce RθJA. The SMCJ45-E3/9AT's RθJA of 75 °C/W assumes this baseline layout; smaller pads cause significant power derating above 25 °C ambient.
SMCJ45-E3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 80.3V
- Current - Peak Pulse (10/1000µs):
- 18.7A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ45-E3/9AT FAQ
1.How can I place an order for SMCJ45-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45-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 SMCJ45-E3/9AT reliable?
The price and inventory of SMCJ45-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 SMCJ45-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ45-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45-E3/9AT?
SMCJ45-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45-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 SMCJ45-E3/9AT?
For technical support, including SMCJ45-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45-E3/9AT requirements.
6.How does Aetrix verify that SMCJ45-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ45-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 SMCJ45-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ45-E3/9AT?
All SMCJ45-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45-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 SMCJ45-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ45-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45-E3/9AT Tags
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