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Vishay General Semiconductor - Diodes Division SMCJ45A-E3/9AT
- Part No.:
- SMCJ45A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45A-E3/9AT.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,195
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Product details
Overview
SMCJ45A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR at 1 mA), 72.7 V maximum clamping voltage (VC) at 20.6 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ45A-E3/9AT datasheet, SMCJ45A-E3/9AT pinout, SMCJ45A-E3/9AT application, or SMCJ45A-E3/9AT equivalent, key selection criteria include clamping performance under 20.6 A surge, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ45A-E3/9AT operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response time and low incremental surge resistance. Its clamping behavior is defined by a tightly controlled VBR range (50.0–55.3 V) and fixed 1 mA test current, ensuring predictable turn-on during transients induced by inductive load switching or ESD events.
Thermally, it relies on PCB copper pad area (0.31″ × 0.31″) for heat dissipation, with RθJL = 15 °C/W to lead and RθJA = 75 °C/W to ambient. Polarity is marked by a cathode band; no marking applies to bidirectional variants - confirming its unidirectional identity per device marking code GFV and suffix "A".
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V systems. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Ensures reliable, repeatable avalanche initiation across temperature and unit variation. |
| VC @ IPPM | 72.7 V at 20.6 A - Limits protected circuit voltage during worst-case 10/1000 µs surge; critical for MOSFET gate oxide safety. |
| PPPM | 1500 W - Peak pulse power handling capability under standardized transient waveform; enables single-device protection for high-energy surges. |
| TJ max | +150 °C - Maximum junction temperature rating supports operation in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm body and 2.62 mm height; compatible with J-STD-020 MSL Level 1 reflow. |
Pinout & Package
SMCJ45A-E3/9AT uses the SMC (DO-214AB) package: a two-terminal, surface-mount plastic case with cathode band marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; forms current path during reverse-biased clamping event. |
| Cathode | High-side connection point | Marked by band; connects to protected line (e.g., 48 V rail); conducts avalanche current when VIN exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables high-density PCB layouts and compatibility with automated pick-and-place equipment without height interference. |
| Glass-passivated junction | Provides stable, repeatable avalanche characteristics over lifetime and temperature, reducing parameter drift in harsh environments. |
| 1500 W peak pulse power | Supports single-device protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Combination Wave surges in automotive ECUs. |
| AEC-Q101 qualified option | Available in HE3/HM3 variants; confirms reliability for automotive powertrain and chassis applications requiring stress-tested components. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile use without baking, simplifying manufacturing logistics. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed control modules (e.g., ADAS camera ECU) from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp surges above 45 V. Use Value: Limits voltage to ≤72.7 V during 20.6 A 10/1000 µs surge, preventing damage to downstream DC-DC converters and microcontrollers. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) in factory automation sensors exposed to cable-induced surges. IC Role / Device Role / Timing Role: TVS connected across signal and return lines to absorb fast-rising transients before reaching precision amplifier inputs. Use Value: Sub-ns response ensures clamping occurs before sensitive op-amps saturate or latch up, preserving measurement integrity. |
| Telecom DC Power Feeds | Consumer Power Adapter Outputs |
Use Scenario: Overvoltage suppression on -48 V telecom rectifier outputs subject to lightning-induced surges on long feed lines. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at PSE port to shunt surge energy to common ground before entering PoE controller ICs. Use Value: 1500 W rating handles multiple IEC 61000-4-5 2 kV/1.2/50 µs surges without degradation, supporting multi-year field deployment. | Use Scenario: Secondary-side protection in USB-C PD adapters where 20 V output rails require immunity to hot-plug and short-circuit transients. IC Role / Device Role / Timing Role: TVS placed after secondary-side synchronous rectifier to protect GaN FETs and output capacitors. Use Value: 72.7 V clamping voltage provides ≥25 % margin above 20 V nominal, avoiding false triggering while ensuring MOSFET VDSS safety. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC45A-TB-E3 | Same VWM (45 V), lower PPPM (600 W), smaller SMA package (DO-214AC), higher VC (80 V) | Limited to lower-energy surges; unsuitable for ISO 7637-2 Pulse 5a or IEC 61000-4-5 4 kV tests | Select when board space is constrained and surge threat level is limited to ESD or low-energy switching noise. |
| 1.5SMC45A | Identical electrical specs (VWM, VBR, VC, PPPM), same SMC package, but non-AEC-Q101 rated and no RoHS suffix designation | No automotive qualification; not traceable to Vishay's AEC-Q101 production lot controls | Acceptable for commercial/industrial use where automotive reliability certification is not required. |
Compared with SAC45A-TB-E3 and 1.5SMC45A, the SMCJ45A-E3/9AT delivers higher surge robustness in the same footprint and includes RoHS compliance and optional AEC-Q101 qualification - making it the preferred choice for automotive and high-reliability industrial designs requiring verified long-term clamping stability.
Availability
SMCJ45A-E3/9AT is available at Aetrix Electronics and suitable for automotive power input protection, industrial sensor signal line protection, telecom DC power feeds, and consumer power adapter outputs requiring stable component supply and full traceability.
Supply support for SMCJ45A-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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is engineered for high-energy transient suppression in demanding environments - targeting automotive, industrial, and telecom infrastructure where consistent clamping performance and long-term stability under thermal cycling are mandatory.
FAQ
What is the maximum clamping voltage of the SMCJ45A-E3/9AT and under what test condition?
The SMCJ45A-E3/9AT has a maximum clamping voltage (VC) of 72.7 V, measured at a peak pulse current (IPPM) of 20.6 A using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and reflects worst-case voltage seen by downstream circuitry during surge events - a critical parameter for ensuring MOSFET and IC voltage ratings are not exceeded.
Is the SMCJ45A-E3/9AT RoHS-compliant and halogen-free?
Yes, the SMCJ45A-E3/9AT carries the "E3" suffix, indicating it is RoHS-compliant and meets commercial-grade material requirements per Vishay's documentation. It is not halogen-free; for halogen-free compliance, the "M3" suffix variant (e.g., SMCJ45A-M3/9AT) must be selected. Both E3 and M3 versions satisfy JESD 201 Class 2 whisker resistance and J-STD-002 solderability standards.
Does the SMCJ45A-E3/9AT have AEC-Q101 qualification?
No, the SMCJ45A-E3/9AT itself is not AEC-Q101 qualified. However, Vishay offers AEC-Q101-qualified versions under the HE3 (RoHS-compliant + AEC-Q101) and HM3 (halogen-free + RoHS + AEC-Q101) suffixes - for example, SMCJ45AHE3_A/I. The E3 suffix denotes commercial-grade qualification only; automotive designs requiring AEC-Q101 must specify the HE3 or HM3 variant explicitly.
What is the thermal resistance and how does it affect PCB layout for the SMCJ45A-E3/9AT?
The SMCJ45A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended 0.31″ × 0.31″ (8.0 mm × 8.0 mm) copper pads per terminal. To maintain safe junction temperatures under repeated surges, designers must allocate adequate copper area and avoid excessive trace length or isolation - especially in high-temperature environments like engine compartments where ambient can exceed 105 °C.
How does the SMCJ45A-E3/9AT differ from bidirectional variants like SMCJ45CA?
The SMCJ45A-E3/9AT is unidirectional, with polarity indicated by a cathode band and intended for DC line protection where reverse voltage is blocked. In contrast, SMCJ45CA is bidirectional - symmetrical in both directions, no polarity marking, and used in AC-coupled or floating signal paths. Their VBR, VWM, and VC values differ: SMCJ45A specifies VWM = 45 V and VBR = 50.0–55.3 V, while SMCJ45CA has identical VWM but dual-directional breakdown behavior - making them functionally non-interchangeable without circuit redesign.
SMCJ45A-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 20.6A
- 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)
SMCJ45A-E3/9AT FAQ
1.How can I place an order for SMCJ45A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45A-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 SMCJ45A-E3/9AT reliable?
The price and inventory of SMCJ45A-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 SMCJ45A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ45A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45A-E3/9AT?
SMCJ45A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45A-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 SMCJ45A-E3/9AT?
For technical support, including SMCJ45A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45A-E3/9AT requirements.
6.How does Aetrix verify that SMCJ45A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ45A-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 SMCJ45A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ45A-E3/9AT?
All SMCJ45A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45A-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 SMCJ45A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ45A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45A-E3/9AT Tags
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