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Taiwan Semiconductor Corporation SMCJ28CA
- Part No.:
- SMCJ28CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28CA.pdf
- Description:
- TVS DIODE 28VWM 45.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,856
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Product details
Overview
SMCJ28CA from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 28V working stand-off voltage (VWM), 31.1–34.4V breakdown voltage (VBR), and 45.4V maximum clamping voltage (VC) at 34A peak pulse current. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ28CA datasheet, SMCJ28CA pinout, SMCJ28CA application, or SMCJ28CA equivalent, this device delivers fast sub-1ps response, <1μA reverse leakage above 10V, and robust 150°C junction temperature rating - critical for ESD and inductive switching surge protection in DC power systems.
Technical Context
The SMCJ28CA is a bipolar TVS diode designed for symmetrical transient suppression in both directions, meeting ISO 7637-2 immunity requirements for automotive electronics. Its glass-passivated junction ensures stable VBR tolerance and low leakage, while the DO-214AB package supports automated placement and JESD201 Class 2 whisker resistance.
Thermal performance is defined by 10°C/W junction-to-case (RθJC) and 55°C/W junction-to-ambient (RθJA) resistance. The device sustains 200A non-repetitive forward surge (IFSM) and operates across –55°C to +150°C storage and junction temperatures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24V automotive systems. |
| VBR min/max | 31.1 V / 34.4 V @ IT = 1 mA - Tight breakdown window ensures predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 45.4 V @ 34 A - Clamping voltage limits downstream IC stress during 10/1000μs surge events per REA standard. |
| PPK | 1500 W - Peak pulse power handling capacity for single-event transients up to 1 ms duration. |
| IR @ VWM | <1 μA - Ultra-low leakage preserves battery life and avoids false triggering in always-on circuits. |
| TJ max | +150 °C - Enables reliable operation in under-hood automotive environments and high-power industrial enclosures. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional configuration with cathode band omitted (symmetrical terminals). Matte tin-plated leads, UL 94V-0 molding compound, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bidirectional transient path | Identical terminal function in both directions; no polarity marking required; connects across protected line and ground or between differential lines. |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), enabling drop-in use in automotive ECUs. |
| Sub-1 ps response time | Clamps within <1.0 ps from 0 V to VBR min, limiting voltage overshoot before sensitive logic or analog circuitry is exposed. |
| Glass passivated junction | Ensures long-term VBR stability and low IR drift over temperature and lifetime, critical for safety-critical protection circuits. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU, supporting green manufacturing and end-of-life recycling requirements. |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 24V battery rail in engine control units subjected to load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping element placed directly across power input to suppress ISO 7637-2 Pulse 1 (−120V/50ms) and Pulse 2b (−100V/2ms). Use Value: Limits rail voltage to ≤45.4V during 34A surges, preventing damage to MCU power supplies and CAN transceivers. |
Use Scenario: 24V DC digital input module exposed to inductive kickback from solenoid valves and contactors. IC Role / Device Role / Timing Role: Bidirectional shunt protector on field-side input terminals, clamping both positive and negative transients. Use Value: Absorbs 1500W pulses without degradation, maintaining signal integrity and eliminating need for external series impedance. |
| LED Driver Overvoltage Protection | Telecom Power Interface |
Use Scenario: Constant-current LED driver board powered from unregulated 24–36V supply with potential lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS placed after bulk filter capacitor to protect driver ICs and current-sense resistors. Use Value: Clamps transients to 45.4V before they reach 40V-rated MOSFETs and op-amps, extending system MTBF. |
Use Scenario: 24V PoE-powered telecom remote unit connected via long outdoor cables susceptible to EFT and lightning coupling. IC Role / Device Role / Timing Role: First-stage transient suppressor on DC input before DC-DC converter and Ethernet PHY power rails. Use Value: Withstands repeated 10/1000μs surges per IEC 61000-4-4, reducing failure rate in outdoor base station deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CA (Bourns) | Same VWM (28V), lower PPK (600W), SMB package (smaller footprint, higher RθJA = 85°C/W). | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 without derating. | Select when space-constrained and surge energy is ≤600W; verify thermal margin in sealed enclosures. |
| 1.5KE28CA (ON Semiconductor) | Same VWM/VBR/VC specs, but axial DO-15 package (through-hole), 1500W rating, slower response (~1ns). | Requires PCB through-holes and manual assembly; not compatible with automated SMT lines. | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SMBJ28CA and 1.5KE28CA, the SMCJ28CA uniquely combines 1500W SMT capability, sub-1ps response, and ISO 7637-2 validation in DO-214AB - making it the preferred choice for production-grade automotive and industrial SMT power rail protection.
Availability
SMCJ28CA is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O modules, LED driver overvoltage protection, and telecom power interface applications requiring stable component supply and full compliance with AEC-Q200 stress test recommendations.
Supply support for SMCJ28CA 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 Taiwanese manufacturer specializing in discrete semiconductors, including TVS diodes, rectifiers, and MOSFETs, with ISO/TS 16949 certification for automotive-grade products.
The SMCJ series was developed specifically for high-energy transient suppression in automotive and industrial power systems, emphasizing robustness, repeatability, and compliance with ISO 7637-2 and IEC 61000-4-5 standards.
FAQ
What is the clamping voltage of SMCJ28CA at its rated peak pulse current?
The SMCJ28CA has a maximum clamping voltage (VC) of 45.4 V at 34 A peak pulse current (IPPM), measured under the 10/1000 μs waveform per REA standard. This value is guaranteed across the full operating temperature range and ensures downstream components see limited overvoltage during surge events.
Is SMCJ28CA unidirectional or bidirectional, and how is polarity marked?
The SMCJ28CA is a bidirectional TVS diode - indicated by the "CA" suffix - and has no polarity marking. Its terminals are functionally identical in both directions, enabling symmetric transient suppression across power/ground or differential signal lines without orientation constraints during placement.
Does SMCJ28CA meet automotive transient immunity standards?
Yes, the SMCJ28CA meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (supply interruption and switching transients), and Pulse 3a/3b (capacitive coupling), as confirmed in Taiwan Semiconductor's official documentation and validated in AEC-Q200-compliant test reports.
What is the maximum junction temperature and thermal resistance of SMCJ28CA?
The SMCJ28CA has a maximum junction temperature (TJ) of +150°C and thermal resistances of RθJC = 10°C/W (junction-to-case) and RθJA = 55°C/W (junction-to-ambient). These values enable reliable operation in high-temperature environments when mounted on 1-in² 2-oz copper with standard SMC pad layout.
How does SMCJ28CA differ from SMCJ28A?
The SMCJ28CA is bidirectional, while SMCJ28A is unidirectional. Their VBR (31.1–34.4 V), VWM (28 V), and VC (45.4 V) match, but SMCJ28A includes a cathode band and conducts forward current only in one direction - making SMCJ28CA suitable for AC or floating-rail protection where polarity is undefined.
SMCJ28CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 33A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ28CA FAQ
1.How can I place an order for SMCJ28CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28CA 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 SMCJ28CA reliable?
The price and inventory of SMCJ28CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28CA is usually 5 days.
3.What payment methods are accepted for SMCJ28CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28CA?
SMCJ28CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28CA 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 SMCJ28CA?
For technical support, including SMCJ28CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28CA requirements.
6.How does Aetrix verify that SMCJ28CA is sourced from the original manufacturer or authorized distributors?
All SMCJ28CA 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 SMCJ28CA meets industry standards.
7.What is the process for return or replacement of SMCJ28CA?
All SMCJ28CA units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28CA, 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 SMCJ28CA part is unused and in its original packaging.
Return procedure for SMCJ28CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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