My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ20CA-E3/57T
- Part No.:
- SMCJ20CA-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20CA-E3/57T.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,169
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ20CA-E3/57T from Vishay General Semiconductor is a bidirectional 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 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 (PPPM) with 10/1000 μs waveform - deployed in automotive sensor protection and industrial I/O interfaces.
For engineers reviewing the SMCJ20CA-E3/57T datasheet, SMCJ20CA-E3/57T pinout, SMCJ20CA-E3/57T application, or SMCJ20CA-E3/57T equivalent, key selection criteria include bidirectional surge capability, low clamping ratio (VC/VWM = 1.62), AEC-Q101 qualification eligibility (via HE3 suffix variants), and compatibility with automated SMT assembly on 8 mm × 8 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped crowbar device during transient overvoltage events, leveraging avalanche breakdown across both polarities. Its bidirectional symmetry ensures identical clamping behavior for positive and negative surges, with guaranteed breakdown voltage (VBR) between 22.2 V and 24.5 V at 1 mA test current.
Thermal performance is defined by RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable operation up to TJ = 150 °C. The device meets J-STD-020 MSL Level 1 and supports lead-free reflow up to 260 °C peak, with matte tin-plated terminals compliant to J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR min/max | 22.2 V / 24.5 V at IT = 1 mA - Guaranteed avalanche initiation window; ensures predictable turn-on under ESD or lightning-induced transients. |
| VC @ IPPM | 32.4 V at 46.3 A (10/1000 μs) - Clamped voltage seen by protected circuit; limits stress on downstream ICs like microcontrollers or CAN transceivers. |
| PPPM | 1500 W - Peak transient energy handling capacity; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge testing when properly mounted. |
| ID @ VWM | 1.0 μA - Reverse leakage at rated stand-off; negligible power loss and minimal impact on high-impedance sensor bias networks. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments and industrial enclosures without derating. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint; compatible with IPC-7351B land patterns. |
Pinout & Package
SMCJ20CA-E3/57T uses the SMC (DO-214AB) package: a molded plastic case with two coplanar gull-wing leads, no polarity marking for bidirectional configuration, and thermal pad-compatible design for enhanced power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts negative-going surges; forms symmetrical conduction path with cathode during bidirectional clamping. |
| Cathode | Transient current entry (positive polarity) | Accepts positive-going surges; enables equal clamping performance in both directions without external polarity management. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both polarities - eliminates need for polarity-aware layout or duplicate unidirectional devices. |
| Low clamping ratio | VC/VWM = 1.62 - minimizes overvoltage exposure to protected ICs compared to alternatives with ratios >1.8. |
| AEC-Q101 readiness | HE3/HM3 variants qualified per AEC-Q101 - supports automotive-grade deployment in ADAS camera modules and body control units. |
| Automated placement support | Gull-wing leads with J-STD-002 solderability - ensures high-yield pick-and-place and reflow process compatibility in volume production. |
| UL 94 V-0 molding compound | Flame-retardant encapsulation - satisfies safety requirements for industrial power supplies and telecom infrastructure equipment. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and jump-start transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Maintains signal integrity under ISO 7637-2 Pulse 5a (75 V/350 ms) by limiting clamped voltage to ≤32.4 V while surviving 1500 W peak pulses. |
Use Scenario: Safeguarding RS-485 transceivers and PLC digital input channels against EFT (IEC 61000-4-4) and surge (IEC 61000-4-5) events in factory automation systems. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) transient suppressor installed across differential pair or single-ended line-to-ground. Use Value: Prevents latch-up or permanent damage to communication ICs by clamping 4 kV surges within 10/1000 μs profile while adding <1 pF parasitic capacitance. |
| Consumer Power Adapter Input | Telecom DC Power Rail |
|
Use Scenario: Secondary-side overvoltage suppression in USB-C PD adapters and wireless charging base stations exposed to AC line transients. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after rectification but before primary DC-DC controller to absorb switching noise and coupling spikes. Use Value: Enables compliance with UL 62368-1 Annex D by limiting transient overshoot to <33 V on 20 V nominal rails without affecting steady-state regulation. |
Use Scenario: Primary protection for -48 V telecom power distribution boards against lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: High-power bidirectional clamp mounted at board edge, coordinated with upstream GDTs and downstream polymeric PTCs. Use Value: Handles 1500 W peak surges while maintaining <1.0 μA leakage at -20 V, preserving battery backup runtime and minimizing standby power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA-E3/52T | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM/VC specs | Limited to lower-energy transients (e.g., ESD-only); unsuitable for IEC 61000-4-5 Level 3+ testing | Select when board space is constrained and surge threat level is limited to human-body-model (HBM) or contact discharge. |
| SMCJ22CA-E3/57T | Higher VWM (22 V), VBR (24.4–26.9 V), and VC (35.5 V); otherwise identical package and rating structure | Better suited for 24 V nominal systems where 20 V VWM risks false triggering during normal ripple | Choose for 24 V industrial controls or automotive 12 V/24 V dual-rail designs requiring margin above nominal supply. |
Compared with SMBJ20CA-E3/52T, SMCJ20CA-E3/57T delivers 2.5× higher surge power handling in the same mounting footprint; versus SMCJ22CA-E3/57T, it offers tighter clamping headroom for 20 V logic rails but requires verification against system ripple tolerance.
Availability
SMCJ20CA-E3/57T is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom DC power rail safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMCJ20CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and AEC-Q qualification.
The SMCJ series targets high-energy transient suppression in harsh environments, with design focus on automotive, industrial, and telecom applications demanding robustness, repeatable clamping, and long-term parametric stability.
FAQ
What is the clamping voltage of SMCJ20CA-E3/57T at its rated peak pulse current?
The SMCJ20CA-E3/57T has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current (IPPM) of 46.3 A using the standard 10/1000 μs waveform. This value is measured under specified test conditions with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal, ensuring realistic thermal boundary conditions for design validation.
Is SMCJ20CA-E3/57T suitable for automotive applications requiring AEC-Q101 qualification?
SMCJ20CA-E3/57T itself is RoHS-compliant commercial-grade; however, the SMCJ20CA-HE3 variant (with HE3 suffix) is explicitly AEC-Q101 qualified per the Vishay datasheet. Engineers requiring automotive qualification should specify SMCJ20CA-HE3_X (where X denotes revision code) rather than SMCJ20CA-E3/57T for under-hood or safety-critical deployments.
How does the bidirectional nature of SMCJ20CA-E3/57T affect PCB layout compared to unidirectional TVS diodes?
SMCJ20CA-E3/57T has no polarity marking and identical electrical behavior in both directions, eliminating orientation constraints during placement. Unlike unidirectional TVS diodes that require cathode alignment toward the protected IC's supply rail, SMCJ20CA-E3/57T simplifies layout by allowing symmetric routing across differential pairs or AC-coupled lines without directional verification.
What is the thermal resistance from junction to ambient for SMCJ20CA-E3/57T, and how does it impact power derating?
The typical junction-to-ambient thermal resistance (RθJA) for SMCJ20CA-E3/57T is 75 °C/W under standard JEDEC test conditions. This value necessitates derating of peak pulse power above TA = 25 °C per Figure 2 in the Vishay datasheet - for example, at 85 °C ambient, usable PPPM drops to approximately 1050 W, directly impacting surge survivability in high-temperature enclosures.
Can SMCJ20CA-E3/57T be used to protect high-speed data lines such as USB 2.0 or CAN FD?
SMCJ20CA-E3/57T is not optimized for high-speed data lines due to its relatively high junction capacitance (>100 pF at zero bias, per typical curves in the datasheet) and clamping response tailored for power-level transients. For USB 2.0 or CAN FD, lower-capacitance TVS arrays (e.g., USBLC6-2SC6 or TPD2EUSB30) are recommended to avoid signal integrity degradation.
SMCJ20CA-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:
- -
- 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 (SMCJ)
SMCJ20CA-E3/57T FAQ
1.How can I place an order for SMCJ20CA-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20CA-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 SMCJ20CA-E3/57T reliable?
The price and inventory of SMCJ20CA-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 SMCJ20CA-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ20CA-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20CA-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20CA-E3/57T?
SMCJ20CA-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20CA-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 SMCJ20CA-E3/57T?
For technical support, including SMCJ20CA-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20CA-E3/57T requirements.
6.How does Aetrix verify that SMCJ20CA-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ20CA-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 SMCJ20CA-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ20CA-E3/57T?
All SMCJ20CA-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20CA-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 SMCJ20CA-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ20CA-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20CA-E3/57T 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 …
