My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ20CA-M3/57T
- Part No.:
- SMCJ20CA-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20CA-M3/57T.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,082
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ20CA-M3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 1500 W peak pulse power rating, 32.4 V maximum clamping voltage at 46.3 A peak pulse current, and 20 V standoff voltage. It protects sensitive ICs, MOSFETs, and sensor signal lines against inductive switching transients and lightning-induced surges in automotive and industrial power electronics.
For engineers reviewing the SMCJ20CA-M3/57T datasheet, SMCJ20CA-M3/57T pinout, SMCJ20CA-M3/57T application, or SMCJ20CA-M3/57T equivalent, key selection criteria include bidirectional clamping symmetry, 1500 W PPPM capability under 10/1000 μs waveform, junction temperature range of –55 °C to +150 °C, and halogen-free RoHS-compliant M3 termination.
Technical Context
The SMCJ20CA-M3/57T operates as a silicon avalanche diode with symmetrical breakdown in both directions, enabling robust protection of AC-coupled or differential signal paths without polarity sensitivity. Its glass-passivated junction ensures stable VBR (22.2–24.5 V) and low incremental surge resistance, critical for fast transient suppression.
Designed for surface-mount automated placement, it meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow peak, and its thermal resistance (RθJA = 75 °C/W) supports operation up to 150 °C junction temperature when mounted on 8.0 mm × 8.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VWM) | 20 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| Breakdown Voltage (VBR) | 22.2–24.5 V at 1 mA - Symmetrical avalanche onset in both directions; ensures consistent protection behavior across polarity |
| Clamping Voltage (VC) | 32.4 V at 46.3 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; determines safe voltage headroom for downstream devices |
| Peak Pulse Power (PPPM) | 1500 W - Energy-handling capacity under standardized 10/1000 μs surge; enables protection against IEC 61000-4-5 Level 4 transients |
| Junction Temperature Range | –55 °C to +150 °C - Specifies full operational reliability across automotive under-hood and industrial ambient conditions |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place |
Pinout & Package
SMCJ20CA-M3/57T uses the SMC (DO-214AB) package: a two-terminal, bidirectional device with no polarity marking. The case is molded epoxy meeting UL 94 V-0; terminals are matte tin-plated for solderability per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bidirectional surge path | Identical electrical behavior in either direction; no cathode band marking; connects across protected line and ground or between differential lines |
| Case | Thermal and mechanical interface | Non-conductive epoxy body; heat dissipation relies on PCB copper pad area (min. 8.0 mm × 8.0 mm per terminal) |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables single-device protection against high-energy transients (e.g., ISO 7637-2 Pulse 5a) without cascaded TVS stages |
| Low clamping ratio (VC/VWM ≈ 1.62) | Minimizes overvoltage stress on protected ICs while maintaining margin above normal operating voltage |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for automotive and industrial end equipment without compromising surge performance |
| MSL Level 1 moisture sensitivity | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and process complexity |
| AEC-Q101 qualification option | Available in HM3 variant for automotive applications requiring validated reliability under temperature cycling and humidity testing |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between power rail and chassis ground. Use Value: Limits transient voltage to ≤32.4 V, preventing damage to 3.3 V/5 V microcontrollers and CAN transceivers downstream. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog inputs. IC Role / Device Role / Timing Role: Differential-line protector across twisted-pair sensor output, referenced to local ground. Use Value: Maintains signal integrity by clamping ESD and fast transients (<1 ns rise time) without adding capacitance that degrades bandwidth. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drive Circuits |
Use Scenario: Surge protection on 48 V PoE-powered network switches and base stations. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input before DC-DC converter stage. Use Value: Absorbs 1500 W surges per IEC 61000-4-5, allowing compact design without external spark gaps or varistors. | Use Scenario: Suppressing back-EMF spikes from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Across motor terminals to clamp inductive kickback during PWM commutation. Use Value: Prevents MOSFET drain-source breakdown by limiting voltage overshoot to 32.4 V, extending power stage lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA-M3 | Lower PPPM (600 W), same VWM/VC, SMB (DO-214AA) package (smaller footprint) | Suitable for lower-energy surges (IEC 61000-4-2 ESD only); limited to <1 kV/0.5 Ω IEC 61000-4-5 | Select when board space is constrained and surge threat level is moderate. |
| SMCJ24CA-M3/57T | Higher VWM (24 V), higher VBR (26.7–29.5 V), same PPPM (1500 W) and package | Better suited for 24 V systems (e.g., commercial vehicle electronics); trades off lower clamping margin for higher operating voltage | Choose for 24 V nominal rails where 20 V standoff would risk false triggering during normal transients. |
Compared with SMBJ20CA-M3 and SMCJ24CA-M3/57T, the SMCJ20CA-M3/57T delivers optimal balance of 20 V system compatibility, 1500 W surge handling, and DO-214AB thermal robustness-making it preferred for 12 V automotive and industrial control applications demanding full IEC 61000-4-5 Level 4 immunity.
Availability
SMCJ20CA-M3/57T is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor signal conditioning, telecom DC power feeds, and consumer appliance motor drive circuits requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ20CA-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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is engineered for high-power transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where sustained surge immunity and thermal stability are mission-critical.
FAQ
What is the standoff voltage (VWM) of the SMCJ20CA-M3/57T?
The SMCJ20CA-M3/57T has a standoff voltage (VWM) of 20 V, meaning it remains in high-impedance state up to this reverse voltage under normal operation. This value ensures reliable blocking during nominal 12 V system operation while providing sufficient margin below its 22.2–24.5 V breakdown range. Exceeding VWM triggers avalanche conduction only during transient events.
Is the SMCJ20CA-M3/57T unidirectional or bidirectional?
The SMCJ20CA-M3/57T is a bidirectional TVS diode, indicated by the "CA" suffix. It exhibits symmetrical breakdown and clamping behavior in both forward and reverse directions, making it ideal for protecting AC-coupled signals, differential buses (e.g., RS-485), or power rails where polarity reversal may occur. No cathode marking is present on the SMCJ20CA-M3/57T package.
What does the "M3" suffix mean in SMCJ20CA-M3/57T?
The "M3" suffix in SMCJ20CA-M3/57T denotes halogen-free, RoHS-compliant construction with matte tin-plated leads. It satisfies environmental regulations including JEDEC J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance. Unlike "E3", M3 confirms absence of brominated flame retardants and chlorine-based compounds, required for many automotive and green-electronics programs.
What is the maximum clamping voltage of the SMCJ20CA-M3/57T at rated surge current?
The SMCJ20CA-M3/57T has a maximum clamping voltage (VC) of 32.4 V at 46.3 A peak pulse current under the standard 10/1000 μs waveform. This value represents the highest voltage imposed on the protected circuit during worst-case surge conditions and is critical for ensuring downstream ICs remain within absolute maximum ratings.
Can the SMCJ20CA-M3/57T be used in automotive applications?
Yes-the SMCJ20CA-M3/57T is qualified for automotive use when ordered with the HM3 suffix (e.g., SMCJ20CAHM3_A/H). While the standard M3 version is commercial-grade, the HM3 variant adds AEC-Q101 qualification including temperature cycling, humidity testing, and HTRB validation. For non-safety-critical 12 V subsystems, the SMCJ20CA-M3/57T provides proven surge resilience aligned with ISO 7637-2 requirements.
SMCJ20CA-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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 46.3A
- 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)
SMCJ20CA-M3/57T FAQ
1.How can I place an order for SMCJ20CA-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20CA-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 SMCJ20CA-M3/57T reliable?
The price and inventory of SMCJ20CA-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 SMCJ20CA-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ20CA-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20CA-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20CA-M3/57T?
SMCJ20CA-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20CA-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 SMCJ20CA-M3/57T?
For technical support, including SMCJ20CA-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20CA-M3/57T requirements.
6.How does Aetrix verify that SMCJ20CA-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ20CA-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 SMCJ20CA-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ20CA-M3/57T?
All SMCJ20CA-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20CA-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 SMCJ20CA-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ20CA-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20CA-M3/57T Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
