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Vishay General Semiconductor - Diodes Division SMCJ28A-E3/57T
- Part No.:
- SMCJ28A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28A-E3/57T.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,588
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Product details
Overview
SMCJ28A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 45.4 V at 33.0 A peak pulse current (10/1000 µs), with 28 V standoff voltage and 1500 W peak pulse power rating. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power supply rails.
For engineers reviewing the SMCJ28A-E3/57T datasheet, SMCJ28A-E3/57T pinout, SMCJ28A-E3/57T application, or SMCJ28A-E3/57T equivalent, key selection criteria include unidirectional polarity, 31.1–34.4 V breakdown voltage range at 1 mA, 1.0 µA max reverse leakage at 28 V, 0.098 %/°C temperature coefficient of VBR, and RoHS-compliant matte tin-plated leads solderable per J-STD-002.
Technical Context
The SMCJ28A-E3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering fast response time (<1 ns) and low incremental surge resistance to clamp transient overvoltages before downstream components are damaged. Its unidirectional configuration provides cathode-banded polarity for DC rail protection with defined forward conduction path.
Designed for mounting on 8.0 mm × 8.0 mm copper pads per terminal, it achieves 1500 W peak pulse power dissipation under 10/1000 µs waveform while maintaining thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected circuit DC bias. |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - Confirmed breakdown range ensures predictable clamping onset across production lot. |
| VC @ IPPM | 45.4 V at 33.0 A - Clamped voltage during 1500 W transient; defines worst-case stress on protected load. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage preserves power efficiency in battery-backed or low-quiescent systems. |
| PPPM | 1500 W - Peak pulse power handling capability under standardized 10/1000 µs waveform per ANSI/IEEE C62.35. |
| TJ max | +150 °C - Maximum junction temperature rating enables use in under-hood automotive and high-ambient industrial environments. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SMCJ28A-E3/57T uses the SMC (DO-214AB) package: two-terminal, unidirectional device with cathode indicated by a band on the body. Leads are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current during overvoltage events to ground or lower-potential rail. |
| Anode | Reference node | Typically tied to system ground or common return; completes clamping path when cathode-side voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables high-density PCB layouts and compatibility with standard reflow profiles for automotive-grade assembly. |
| Glass-passivated chip junction | Ensures stable VBR and long-term reliability under thermal cycling and humidity exposure per MSL Level 1. |
| 1500 W peak pulse power | Withstands severe transients such as ISO 7637-2 Pulse 1/2a/5a in 12 V automotive systems without degradation. |
| AEC-Q101 qualification option | HE3/HM3 variants available for automotive applications requiring validated reliability per stress test requirements. |
| RoHS-compliant & halogen-free options | E3 suffix denotes commercial-grade RoHS compliance; M3 adds halogen-free material compliance for green manufacturing. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load dump and alternator ripple transients on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and input filter capacitor to clamp spikes above 28 V. Use Value: Limits clamped voltage to 45.4 V during 33 A surges, preventing damage to 36 V-rated LDOs and microcontrollers. | Use Scenario: Guarding analog front-end inputs of pressure/temperature sensors connected to noisy factory floor PLCs. IC Role / Device Role / Timing Role: Standoff protection element on sensor signal lines (e.g., 4–20 mA loop or 0–5 V output) against ESD and switching noise. Use Value: Sub-µA leakage at 28 V avoids signal offset errors; fast <1 ns response prevents transient coupling into ADC sampling window. |
| DC-DC Converter Input Protection | Telecom Line Card Surge Suppression |
Use Scenario: Safeguarding buck converter inputs in PoE-powered devices exposed to Ethernet cable-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp ahead of input bulk capacitor and controller IC. Use Value: 1500 W rating handles IEC 61000-4-5 Combination Wave (1.2/50 µs + 8/20 µs) surges without failure. | Use Scenario: Protecting line interface ICs on DSL or T1/E1 cards from lightning-induced longitudinal surges. IC Role / Device Role / Timing Role: Secondary-level transient suppressor on differential pair after gas discharge tube primary protection. Use Value: 45.4 V clamping voltage ensures protected PHY ICs remain within absolute maximum ratings during secondary surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A-E3/52T | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM/VBR specs. | Reduced surge margin; suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD, not IEC 61000-4-5). | Select when board space is constrained and surge threat level is limited to ESD or low-energy switching noise. |
| SMCJ28CA-E3/57T | Bidirectional variant with identical VWM, VBR, and PPPM; no polarity marking; symmetric clamping in both directions. | Required for AC-coupled or floating signal lines where voltage polarity reverses (e.g., RS-485, CAN bus). | Choose for bidirectional signal paths; not interchangeable with SMCJ28A-E3/57T due to polarity and circuit topology differences. |
Compared with SMBJ28A-E3/52T, SMCJ28A-E3/57T delivers 2.5× higher surge energy handling in the same general footprint class; versus SMCJ28CA-E3/57T, it offers optimized clamping for DC rails but cannot protect AC signals without external polarity management.
Availability
SMCJ28A-E3/57T is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and DC-DC converter input surge suppression requiring stable component supply and full traceability.
Supply support for SMCJ28A-E3/57T 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, power efficiency, and automotive-grade qualification.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the breakdown voltage range of the SMCJ28A-E3/57T?
The SMCJ28A-E3/57T has a guaranteed breakdown voltage range of 31.1 V to 34.4 V at a test current of 1 mA, measured per ANSI/IEEE C62.35 standards. This range ensures consistent clamping behavior across temperature and production lots, and is directly specified in the Vishay datasheet Document Number 88394, Revision 09-Jan-2024. The SMCJ28A-E3/57T maintains this performance in its SMC (DO-214AB) package with glass-passivated junction construction.
Is the SMCJ28A-E3/57T suitable for automotive applications?
Yes, the SMCJ28A-E3/57T is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes (e.g., SMCJ28AHE3_A); the E3/57T variant is commercial-grade RoHS-compliant but not AEC-Q101 certified. It meets MSL Level 1 per J-STD-020 and operates from −55 °C to +150 °C, supporting under-hood and chassis-mounted use cases. The SMCJ28A-E3/57T delivers 1500 W peak pulse power needed for ISO 7637-2 compliance when properly mounted on 8 mm × 8 mm copper pads.
How does the SMCJ28A-E3/57T differ from the bidirectional SMCJ28CA-E3/57T?
The SMCJ28A-E3/57T is unidirectional with cathode band marking and conducts only in reverse breakdown, while the SMCJ28CA-E3/57T is bidirectional with no polarity marking and clamps symmetrically in both directions. Their VWM, VBR, and PPPM values are identical, but circuit implementation differs: SMCJ28A-E3/57T is used on DC rails referenced to ground, whereas SMCJ28CA-E3/57T suits AC-coupled or floating lines like RS-485. They are not pin-compatible replacements.
What is the maximum clamping voltage of the SMCJ28A-E3/57T under surge conditions?
The SMCJ28A-E3/57T clamps to a maximum of 45.4 V when subjected to its rated peak pulse current of 33.0 A under the standard 10/1000 µs waveform. This value is measured at the device terminals with specified mounting conditions (0.31″ × 0.31″ copper pads per lead) and defines the upper voltage stress imposed on downstream components during transient events. The SMCJ28A-E3/57T achieves this clamping performance while maintaining low incremental surge resistance and sub-µA leakage at 28 V.
Does the SMCJ28A-E3/57T require a heatsink for standard operation?
No, the SMCJ28A-E3/57T does not require an external heatsink for transient suppression duty cycles, as its 1500 W rating applies to non-repetitive pulses. However, its thermal resistance is 75 °C/W (junction-to-ambient) on standard PCB pads, so sustained power dissipation must be limited to 6.5 W (PD) at TA = 50 °C. For repetitive surges or high ambient temperatures, thermal relief via increased copper area is recommended. The SMCJ28A-E3/57T relies on PCB copper as its primary heat path, not discrete heatsinks.
SMCJ28A-E3/57T 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):
- 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:
- 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)
SMCJ28A-E3/57T FAQ
1.How can I place an order for SMCJ28A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28A-E3/57T 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 SMCJ28A-E3/57T reliable?
The price and inventory of SMCJ28A-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ28A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28A-E3/57T?
SMCJ28A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28A-E3/57T 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 SMCJ28A-E3/57T?
For technical support, including SMCJ28A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28A-E3/57T requirements.
6.How does Aetrix verify that SMCJ28A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ28A-E3/57T 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 SMCJ28A-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ28A-E3/57T?
All SMCJ28A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28A-E3/57T, 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 SMCJ28A-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ28A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28A-E3/57T Tags
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