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Taiwan Semiconductor Corporation SMCJ45A
- Part No.:
- SMCJ45A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45A.pdf
- Description:
- TVS DIODE 45VWM 72.7VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:457
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Product details
Overview
SMCJ45A from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 45V working stand-off voltage (VWM), 50–55.3V breakdown voltage (VBR), and 72.7V maximum clamping voltage (VC) at 21A peak pulse current - designed for automotive load-dump and inductive switching surge protection in power supply rails.
For engineers reviewing the SMCJ45A datasheet, SMCJ45A pinout, SMCJ45A application, or SMCJ45A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature derating above 25°C, unidirectional polarity marking, and compatibility with automated SMT placement on 1.5mm-thick PCBs per J-STD-002 solderability.
Technical Context
The SMCJ45A employs a glass-passivated silicon junction optimized for sub-1.0ps response to fast transients, delivering precise clamping within 72.7V at 21A (10/1000μs waveform). Its thermal design supports 150°C max junction temperature with RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable operation in engine control units and industrial motor drives.
As a unidirectional TVS, it blocks reverse current up to 45V (VWM), exhibits <1μA leakage at rated VWM, and sustains 200A non-repetitive forward surge (IFSM) - meeting JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for high-reliability automotive PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 50.0 / 55.3 V @ 1 mA - Confirmed breakdown threshold range for production screening |
| VC @ IPPM | 72.7 V @ 21 A - Clamped voltage during 10/1000μs surge, defining protected circuit voltage ceiling |
| PPK | 1500 W - Peak pulse power handling capability per single 1ms transient |
| IR @ VWM | <1 μA - Reverse leakage ensuring minimal standby power loss in battery-backed systems |
| TJ max | +150 °C - Maximum junction temperature enabling under-hood deployment without forced cooling |
| Package | DO-214AB (SMC) - Standardized 7.11 × 6.22 mm surface-mount outline compatible with IPC-7351B footprint |
Pinout & Package
DO-214AB (SMC) package: cathode-banded monolithic unidirectional TVS diode with two terminals - anode (unmarked end) and cathode (banded end). Matte tin-plated leads meet J-STD-002 solderability; polarity must be observed during layout to prevent reverse-bias failure.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge events |
| Cathode | Reverse-blocking/clamping terminal | Connected to protected line (e.g., 45V rail); initiates avalanche clamping when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) - required for automotive ECU qualification |
| Sub-1.0ps response time | Enables suppression of ESD and fast EFT transients before sensitive ICs experience overstress - critical for CAN/LIN bus protection |
| Glass passivated junction | Ensures stable VBR over lifetime and humidity exposure (MSL Level 1), eliminating need for conformal coating in humid environments |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - compliant for export to EU, China, and Korea markets |
| Automated placement compatibility | DO-214AB tape-and-reel packaging (3000/reel) supports high-speed pick-and-place at ≥25,000 CPH with standard nozzles |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Power Stage |
|---|---|
Use Scenario: Protecting microcontroller I/O and sensor supply lines from alternator load-dump spikes (up to 120V) during battery disconnect. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed directly at connector entry point to limit rail voltage to ≤72.7V during transients. Use Value: Prevents latch-up or gate oxide rupture in 5V/3.3V logic rails by holding clamped voltage 30% below typical 100V automotive surge limits. | Use Scenario: Safeguarding gate drivers and current-sense amplifiers from inductive kickback during MOSFET turn-off in 48V BLDC inverters. IC Role / Device Role / Timing Role: Fast-response transient suppressor across DC bus and low-side shunt inputs to absorb 1500W energy pulses. Use Value: Enables use of cost-optimized 80V-rated gate drivers instead of 150V+ variants, reducing BOM cost by ~22%. |
| LED Streetlight Power Supply | Telecom Remote Radio Unit (RRU) |
Use Scenario: Suppressing lightning-induced surges on AC-input rectified rails in outdoor LED drivers exposed to Category III surge environments. IC Role / Device Role / Timing Role: Primary clamping element downstream of MOVs, providing precise secondary protection with low clamping voltage. Use Value: Reduces risk of LED driver IC failure by limiting transient overshoot to 72.7V - well below 100V input-stage MOSFET VDSS rating. | Use Scenario: Protecting RS-485 transceivers and power management ICs from EFT bursts in outdoor base station cabinets subjected to 4kV contact discharge. IC Role / Device Role / Timing Role: Board-level TVS on 12V bias rail and data line terminations to meet IEC 61000-4-4 Level 4 immunity. Use Value: Achieves >95% pass rate in EFT testing without system reset, due to sub-1.0ps response and <1μA leakage preserving signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A (ON Semiconductor) | Same VWM/VBR/VC specs but 600W PPK rating; SMB package (smaller footprint, higher RθJA = 85°C/W) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a (load dump) | Select SMCJ45A when 1500W surge handling and automotive-grade thermal robustness are mandatory |
| P6SMB45A (Vishay) | Identical 1500W rating and DO-214AB package; VBR min = 50.0V, VC = 72.7V - matches SMCJ45A within ±0.1V | Same application scope; differs only in MSL level (Level 1 vs Level 2a) and lead finish (matte tin vs SnPb optional) | Choose SMCJ45A for full J-STD-020 MSL Level 1 compliance and guaranteed halogen-free construction |
Compared with SMBJ45A, SMCJ45A delivers 2.5× higher surge energy handling and superior thermal dissipation for under-hood use; versus P6SMB45A, it offers identical clamping performance but stricter moisture sensitivity control and broader automotive qualification documentation.
Availability
SMCJ45A is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, LED streetlight power supplies, and telecom remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMCJ45A 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs since 1979.
The SMCJ series was developed specifically for automotive and industrial transient suppression, emphasizing ISO 7637-2 compliance, high-temperature reliability, and automated assembly readiness - targeting ECU, ADAS, and motor control applications.
FAQ
What is the maximum clamping voltage of the SMCJ45A under a 10/1000μs surge?
The SMCJ45A has a maximum clamping voltage (VC) of 72.7 V when subjected to a 21 A peak pulse current with a 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuits during worst-case transients - critical for ensuring downstream ICs remain within absolute maximum ratings.
Does the SMCJ45A meet automotive surge immunity standards?
Yes, the SMCJ45A meets ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b - covering inductive load dump, switch-off transients, and coupled noise in 12V vehicle electrical systems. Its 1500W peak power rating and 72.7V clamping enable compliance with OEM-level surge test plans for engine control modules and body electronics.
What is the polarity configuration of the SMCJ45A and how is it marked?
The SMCJ45A is a unidirectional TVS diode with cathode indicated by a band on the DO-214AB (SMC) package body. The banded end connects to the protected line (e.g., 45V rail), while the unmarked end connects to ground. Incorrect orientation results in forward conduction during normal operation and catastrophic failure.
Can the SMCJ45A be used in bidirectional applications?
No - the SMCJ45A is strictly unidirectional. For bidirectional protection, select the SMCJ45CA variant (with CA suffix), which provides symmetrical clamping in both directions. Using SMCJ45A in reverse-biased configurations will cause permanent junction damage due to its asymmetric structure.
What is the moisture sensitivity level (MSL) and reflow profile for the SMCJ45A?
The SMCJ45A is rated MSL Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH without dry-pack requirements. Its matte tin-plated leads support standard Pb-free reflow profiles (peak 260°C, 20–40 sec above 217°C), with no floor life limitation - ideal for high-volume SMT lines.
SMCJ45A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ45A FAQ
1.How can I place an order for SMCJ45A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45A 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 reliable?
The price and inventory of SMCJ45A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45A is usually 5 days.
3.What payment methods are accepted for SMCJ45A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45A?
SMCJ45A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45A 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?
For technical support, including SMCJ45A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45A requirements.
6.How does Aetrix verify that SMCJ45A is sourced from the original manufacturer or authorized distributors?
All SMCJ45A 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 meets industry standards.
7.What is the process for return or replacement of SMCJ45A?
All SMCJ45A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45A, 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 part is unused and in its original packaging.
Return procedure for SMCJ45A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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