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Vishay General Semiconductor - Diodes Division SMCJ20-E3/57T
- Part No.:
- SMCJ20-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20-E3/57T.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,343
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Product details
Overview
SMCJ20-E3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. It features a 20 V stand-off voltage (VWM), 32.4 V maximum clamping voltage (VC) at 46.3 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation (PPPM) with 10/1000 µs waveform - ideal for safeguarding MOSFETs, ICs, and sensor signal lines in automotive and industrial power supplies.
For engineers reviewing the SMCJ20-E3/57T datasheet, SMCJ20-E3/57T pinout, SMCJ20-E3/57T application, or SMCJ20-E3/57T equivalent, key selection criteria include verified unidirectional polarity, AEC-Q101 qualification, RoHS-compliant matte tin plating, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on standard 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ20-E3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering sub-nanosecond response to transients induced by inductive load switching or ESD events. Its breakdown voltage (VBR) is specified at 22.2–24.5 V with 1 mA test current, ensuring precise triggering above system operating voltage while maintaining low leakage (<1.0 µA at 20 V).
Thermally, it supports junction temperatures from –55 °C to +150 °C, with typical thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling reliable operation under sustained surge conditions when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - reverse stand-off voltage; defines maximum continuous operating voltage before significant leakage |
| VBR min/max | 22.2 V / 24.5 V at 1 mA - ensures consistent avalanche initiation across production lots |
| VC @ IPPM | 32.4 V at 46.3 A - clamping voltage during 10/1000 µs surge; limits stress on downstream components |
| PPPM | 1500 W - peak pulse power handling capability under standardized transient waveform |
| IFSM | 200 A - non-repetitive forward surge rating (8.3 ms half-sine); supports inrush current immunity |
| TJ max | +150 °C - maximum junction temperature; enables use in under-hood automotive environments |
| MSL Level | Level 1 per J-STD-020 - no floor life limitation; suitable for standard reflow without dry pack |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with molded UL 94 V-0 compound; cathode indicated by band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side in unidirectional clamp configuration; carries surge current during reverse transient |
| Cathode (banded end) | Avalanche breakdown terminal | Connected to protected line; initiates clamping when reverse voltage exceeds VBR; polarity-critical for correct protection orientation |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and low leakage over temperature and lifetime; improves reliability vs. epoxy-passivated alternatives |
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS subsystems |
| Matte tin-plated leads | Complies with J-STD-002 and JESD 22-B102; supports lead-free reflow and eliminates whisker risk (JESD 201 Class 1A) |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients; critical for protecting high-speed digital interfaces |
| 1500 W peak pulse power | Handles severe ISO 7637-2 Pulse 1/2a/5a surges without degradation in automotive 12 V systems |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 12 V supply rails feeding ECUs, lighting modules, and infotainment systems against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges up to 1500 W. Use Value: Limits clamped voltage to ≤32.4 V, preventing damage to 36 V-rated DC-DC converters and microcontrollers. | Use Scenario: Shielding analog outputs (e.g., 4–20 mA, 0–10 V) of pressure/temperature sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and ground to absorb ESD and cable-induced transients. Use Value: Sub-1 nS response time prevents latch-up in precision op-amps; <1.0 µA leakage avoids measurement drift. |
| Consumer Power Adapters | Telecom DC Feeds |
Use Scenario: Secondary-side overvoltage protection in AC/DC adapters for laptops and monitors exposed to lightning-induced surges on mains input. IC Role / Device Role / Timing Role: Unidirectional clamp on +VOUT rail after secondary rectifier to protect downstream regulators and USB controllers. Use Value: 20 V VWM matches typical 19 V adapter output; 32.4 V VC ensures safe margin below 36 V rated LDO inputs. | Use Scenario: Surge suppression on -48 V DC distribution lines powering base station RF amplifiers and remote radio units. IC Role / Device Role / Timing Role: Reverse-biased TVS (anode to -48 V, cathode to ground) to clamp negative-going transients on telecom power feeds. Use Value: 200 A IFSM withstands repeated 8.3 ms surges per Telcordia GR-1089-CORE; RoHS/Eco compliance meets global telecom procurement mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/61 | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Not suitable for automotive load dump; limited to low-energy consumer surges | Select only for space-constrained, low-power applications where 1500 W rating is unnecessary |
| SMCJ20AHE3/57T | Identical electrical specs but AEC-Q101 qualified (HE3 suffix); same DO-214AB package and pinout | Required for automotive OEM designs requiring full qualification documentation and traceability | Choose SMCJ20AHE3/57T when AEC-Q101 certification is mandatory; otherwise SMCJ20-E3/57T suffices for industrial/commercial use |
Compared with SMAJ20A-E3/61 and SMCJ20AHE3/57T, the SMCJ20-E3/57T delivers full 1500 W surge capacity in a ruggedized DO-214AB package with commercial-grade qualification - offering optimal balance of performance, cost, and manufacturability for non-OEM industrial and telecom power protection.
Availability
SMCJ20-E3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor signal lines, consumer power adapters, and telecom DC feeds requiring stable component supply, RoHS compliance, and AEC-Q101-optional surge protection.
Supply support for SMCJ20-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, efficiency, and automotive-grade qualification.
The SMCJ series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure resilience is mission-critical.
FAQ
What is the clamping voltage of the SMCJ20-E3/57T under a 10/1000 µs surge?
The SMCJ20-E3/57T has a maximum clamping voltage (VC) of 32.4 V at 46.3 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream components such as 36 V-rated DC-DC converters and microcontrollers. The SMCJ20-E3/57T maintains this clamping performance across its full operating temperature range.
Is the SMCJ20-E3/57T suitable for automotive applications?
The SMCJ20-E3/57T is RoHS-compliant and manufactured to Vishay's commercial-grade specifications. While it shares the same DO-214AB package and core electrical characteristics as AEC-Q101-qualified variants (e.g., SMCJ20AHE3/57T), the SMCJ20-E3/57T itself is not AEC-Q101 certified. For production automotive systems requiring formal qualification, the HE3-suffix version must be selected. The SMCJ20-E3/57T remains appropriate for non-OEM automotive aftermarket or industrial applications with similar surge profiles.
What does the "E3/57T" suffix indicate in SMCJ20-E3/57T?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting J-STD-002 solderability and JESD 201 Class 1A whisker resistance. The "57T" indicates packaging in 7-inch diameter plastic tape and reel, with a base quantity of 850 units per reel - optimized for high-volume SMT assembly. This packaging format ensures consistent feed reliability in pick-and-place equipment and supports IPC-A-610 Class 2/3 process compliance.
How does the SMCJ20-E3/57T compare to bi-directional TVS diodes like SMCJ20CA?
The SMCJ20-E3/57T is unidirectional and intended for DC line protection where polarity is fixed (e.g., +12 V rail to ground). In contrast, SMCJ20CA is bi-directional and used in AC-coupled or floating signal paths (e.g., RS-485, CAN bus). The SMCJ20-E3/57T offers lower leakage (<1.0 µA at 20 V) and higher IFSM (200 A) than its bi-directional counterpart, but cannot suppress positive transients on grounded lines. Selection depends strictly on circuit topology and signal polarity requirements.
What thermal derating applies to the SMCJ20-E3/57T above 25 °C ambient?
The SMCJ20-E3/57T follows Vishay's standard derating curve (Fig. 2 in document 88394): peak pulse power (PPPM) decreases linearly from 100% at 25 °C to ~50% at 125 °C ambient, assuming mounting on 8.0 mm × 8.0 mm copper pads per terminal. Its thermal resistance is 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), so proper PCB copper area and thermal vias are essential to maintain clamping performance under sustained high-temperature operation. The SMCJ20-E3/57T remains functional up to +150 °C junction temperature.
SMCJ20-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 41.9A
- 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)
SMCJ20-E3/57T FAQ
1.How can I place an order for SMCJ20-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20-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 SMCJ20-E3/57T reliable?
The price and inventory of SMCJ20-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 SMCJ20-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ20-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20-E3/57T?
SMCJ20-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20-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 SMCJ20-E3/57T?
For technical support, including SMCJ20-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20-E3/57T requirements.
6.How does Aetrix verify that SMCJ20-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ20-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 SMCJ20-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ20-E3/57T?
All SMCJ20-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20-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 SMCJ20-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ20-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20-E3/57T Tags
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