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Vishay General Semiconductor - Diodes Division SMCJ28A-M3/57T
- Part No.:
- SMCJ28A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28A-M3/57T.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,233
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Product details
Overview
SMCJ28A-M3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage (VC) at 33.0 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive power supply protection and industrial sensor interface circuits.
For engineers reviewing the SMCJ28A-M3/57T datasheet, SMCJ28A-M3/57T pinout, SMCJ28A-M3/57T application, or SMCJ28A-M3/57T equivalent, key selection criteria include unidirectional polarity, halogen-free RoHS-compliant M3 suffix, 1500 W surge capability, 45.4 V clamping performance at rated IPPM, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ28A-M3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering sub-nanosecond response to transient overvoltages. Its low incremental surge resistance and stable thermal coefficient of VBR (0.098 %/°C) ensure consistent clamping across temperature and repeated surges.
Designed for unidirectional DC line protection, it exhibits 1.0 µA max reverse leakage at 28 V (VWM), 3.5 V forward voltage at 100 A (IF), and meets JESD201 Class 2 whisker resistance and MSL Level 1 reflow requirements (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 31.1 V / 34.4 V at 1 mA - Confirmed avalanche breakdown range defining turn-on threshold |
| VC @ IPPM | 45.4 V at 33.0 A - Clamped voltage during 1500 W 10/1000 µs surge, limiting downstream stress |
| PPPM | 1500 W - Peak transient energy absorption capacity under standardized waveform |
| ID @ VWM | 1.0 µA - Low leakage ensures minimal standby power loss in high-impedance circuits |
| TJ max | +150 °C - Enables operation in under-hood automotive and industrial ambient environments |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
Pinout & Package
SMCJ28A-M3/57T uses the SMC (DO-214AB) package: a molded, halogen-free, RoHS-compliant surface-mount case with matte tin-plated leads solderable per J-STD-002. Polarity is marked by a cathode band; anode and cathode terminals are located at opposite ends of the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient clamp output node | Connected to protected line; conducts surge current to ground when V > VBR |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V automotive rails without failure |
| Halogen-free M3 suffix | Meets IPC-4101D/21 and JEDEC J-STD-20E environmental compliance for green manufacturing |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at 260 °C peak without moisture-induced damage |
| 0.098 %/°C VBR tempco | Ensures predictable clamping voltage shift ≤ ±1.5 V over -55 °C to +125 °C operating range |
| Low 1.0 µA ID at VWM | Minimizes quiescent current draw in battery-backed or low-power sensor nodes |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: 12 V battery-fed ECU power input subjected to load dump (ISO 7637-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Primary unidirectional TVS clamp placed upstream of DC/DC converter input. Use Value: Limits transient voltage to ≤45.4 V, protecting 40 V-rated input capacitors and controller ICs without derating. |
Use Scenario: 24 V analog sensor output (e.g., pressure transducer) routed through noisy factory wiring harnesses. IC Role / Device Role / Timing Role: Point-of-entry TVS on differential signal pair before instrumentation amplifier input. Use Value: Clamps ESD (IEC 61000-4-2 ±8 kV contact) and burst noise (IEC 61000-4-4 ±2 kV) while adding <1 pF capacitance. |
| Telecom DC Feeder Protection | Consumer Appliance Motor Drive Surge Suppression |
Use Scenario: 48 V PoE-powered network switch port exposed to lightning-induced surges on Ethernet pairs. IC Role / Device Role / Timing Role: Secondary TVS stage after gas discharge tube (GDT), handling residual fast-rising transients. Use Value: Sub-1 ns response captures overshoot missed by slower GDTs, reducing clamping voltage by up to 30 %. |
Use Scenario: Brushed DC motor control board in washing machine experiencing commutation spikes up to 100 V. IC Role / Device Role / Timing Role: Unidirectional TVS across motor terminals to suppress inductive kickback. Use Value: Absorbs 1500 W pulses without degradation, extending MOSFET lifetime and eliminating snubber RC networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-M3/57T | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VBR/VC ratings | Suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD only, not load dump) | Select when board space is constrained and surge threat level is limited to human-body-model events. |
| SMCJ28CA-M3/57T | Bidirectional variant with identical VWM (28 V), symmetric clamping in both polarities, same PPPM and package | Required for AC-coupled or floating signal lines where polarity reversal may occur | Choose for RS-485, CAN bus, or audio line protection where bidirectional surge immunity is mandatory. |
Compared with SMAJ28A-M3/57T and SMCJ28CA-M3/57T, the SMCJ28A-M3/57T provides optimal balance of high-energy surge handling (1500 W), unidirectional efficiency, and SMC footprint robustness - making it preferred for automotive and industrial DC rail protection where peak pulse power and thermal mass matter most.
Availability
SMCJ28A-M3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and telecom DC feeder protection requiring stable component supply and halogen-free compliance.
Supply support for SMCJ28A-M3/57T 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 and AEC-Q qualification.
The SMCJ series targets high-energy transient suppression in harsh environments, engineered specifically for automotive, industrial, and telecom infrastructure applications demanding 1500 W surge capability and long-term stability.
FAQ
What is the clamping voltage of SMCJ28A-M3/57T at its rated peak pulse current?
The SMCJ28A-M3/57T has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated 33.0 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ28A-M3/57T maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMCJ28A-M3/57T suitable for automotive applications?
Yes, the SMCJ28A-M3/57T is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes; however, the M3/57T variant is commercial-grade and not AEC-Q101 certified. For non-automotive-qualified use, it remains widely deployed in automotive subsystems such as body control modules and infotainment power supplies where full qualification is not mandated. Always verify qualification status via the full ordering code - SMCJ28A-M3/57T itself does not carry AEC-Q101 certification.
What does the "M3" suffix mean in SMCJ28A-M3/57T?
The "M3" suffix in SMCJ28A-M3/57T indicates halogen-free, RoHS-compliant construction meeting IPC-4101D/21 and JEDEC J-STD-20E standards. It denotes matte tin-plated leads, JESD201 Class 2 whisker resistance, and compliance with Vishay's material categorization for environmentally responsible manufacturing. This differs from the "E3" suffix, which is RoHS-compliant but not halogen-free.
How does SMCJ28A-M3/57T compare to SMCJ28CA-M3/57T?
The SMCJ28A-M3/57T is unidirectional with cathode marking, while SMCJ28CA-M3/57T is bidirectional and unmarked. Both share identical VWM (28 V), PPPM (1500 W), and package (SMC), but the CA version clamps equally in both directions - essential for AC signals or floating lines. The SMCJ28A-M3/57T offers slightly lower capacitance and avoids reverse conduction in DC systems, making it more efficient for unidirectional rail protection.
What PCB pad layout is recommended for SMCJ28A-M3/57T?
Vishay specifies a minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad area per terminal for SMCJ28A-M3/57T to achieve rated 1500 W pulse power dissipation. Thermal relief traces should be minimized; solid copper connections to internal ground/power planes are recommended. The SMC (DO-214AB) footprint requires 7.75 mm length, 6.22 mm width, and 2.62 mm height clearance, with cathode band aligned per standard orientation.
SMCJ28A-M3/57T 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 (SMC)
SMCJ28A-M3/57T FAQ
1.How can I place an order for SMCJ28A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28A-M3/57T 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-M3/57T reliable?
The price and inventory of SMCJ28A-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28A-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ28A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28A-M3/57T?
SMCJ28A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28A-M3/57T 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-M3/57T?
For technical support, including SMCJ28A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28A-M3/57T requirements.
6.How does Aetrix verify that SMCJ28A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ28A-M3/57T 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-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ28A-M3/57T?
All SMCJ28A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28A-M3/57T, 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-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ28A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28A-M3/57T Tags
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