My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ12A-E3/57T
- Part No.:
- SMCJ12A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12A-E3/57T.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,004
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ12A-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 1500 W peak pulse power with 19.9 V clamping voltage at 75.4 A surge current. It features 13.3–14.7 V breakdown voltage at 1 mA test current, 12 V stand-off voltage, and <5 µA reverse leakage at rated voltage - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ12A-E3/57T datasheet, SMCJ12A-E3/57T pinout, SMCJ12A-E3/57T application, or SMCJ12A-E3/57T equivalent, key selection criteria include unidirectional polarity, 1500 W 10/1000 µs surge rating, 19.9 V clamping performance, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
The SMCJ12A-E3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering fast response time (<1 ns) to transient overvoltages. Its unidirectional configuration uses cathode-band marking and exhibits low incremental surge resistance, enabling precise clamping during inductive load switching events.
Thermal design relies on RθJA = 75 °C/W (typ.) and RθJL = 15 °C/W (typ.), with derating above 25 °C ambient per Fig. 2. It meets J-STD-020 MSL Level 1 and supports peak forward surge current of 200 A (8.3 ms half-sine), making it suitable for high-energy transient suppression without thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - sustains high-energy surges without failure in automotive load-dump or ESD scenarios |
| Clamping Voltage (VC) | 19.9 V at 75.4 A - limits downstream voltage stress to safe levels for 12 V rail components |
| Breakdown Voltage (VBR) | 13.3–14.7 V at 1 mA - ensures reliable avalanche conduction onset before system damage |
| Stand-off Voltage (VWM) | 12 V - blocks normal 12 V operating voltage while remaining fully inactive |
| Reverse Leakage Current | <5 µA at 12 V - negligible standby power loss and no signal integrity impact |
| Junction Temperature Range | −55 to +150 °C - supports under-hood automotive and industrial ambient conditions |
| Package | SMC (DO-214AB) - industry-standard SMT footprint with 8.0 mm × 8.0 mm copper pad thermal requirement |
Pinout & Package
SMCJ12A-E3/57T is housed in an SMC (DO-214AB) surface-mount package with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity is marked by a cathode band on the body; the device has two terminals only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; completes clamping loop during transient |
| Cathode (banded end) | High-side transient input terminal | Connected to protected line (e.g., 12 V supply or signal); conducts avalanche current to ground |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables high-density PCB layouts and compatibility with automated pick-and-place equipment |
| Glass-passivated junction | Ensures stable breakdown characteristics and long-term reliability under repeated surge stress |
| 1500 W peak pulse rating | Provides robust protection against ISO 7637-2 Load Dump (Pulse 5a) and IEC 61000-4-5 surges |
| AEC-Q101 qualification option | HE3/HM3 variants available for automotive-grade deployment with validated lifetime performance |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow without baking, simplifying manufacturing flow |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V power rails in engine control units (ECUs) and body control modules (BCMs) from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery feed and local regulator input to clamp transients before LDO or DC/DC stage. Use Value: Limits clamped voltage to 19.9 V, preventing overvoltage damage to 24 V tolerant regulators and ensuring system reset-free operation. | Use Scenario: Shielding analog and digital signal lines (e.g., CAN, LIN, or ADC inputs) in factory automation sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance transient suppressor installed at connector entry point to shunt fast transients to chassis ground. Use Value: Sub-5 µA leakage preserves signal integrity on high-impedance sensor outputs; 19.9 V clamping protects 3.3 V/5 V interface ICs without false triggering. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeds |
Use Scenario: Safeguarding AC/DC adapter primary-side rectifier and secondary-side 12 V output against lightning-induced surges on mains-connected devices. IC Role / Device Role / Timing Role: Secondary-side TVS mounted across output capacitor to absorb residual transients escaping primary-side MOVs. Use Value: 1500 W rating handles multiple 10/1000 µs surges; RoHS-compliant E3 suffix meets global regulatory requirements for consumer goods. | Use Scenario: Protecting -48 V DC telecom power distribution boards from hot-swap transients and accidental short-circuit recovery spikes. IC Role / Device Role / Timing Role: Unidirectional suppressor connected between -48 V rail and return, leveraging cathode-to-rail orientation for correct biasing. Use Value: 12 V stand-off allows use on derived 12 V auxiliary rails; 1500 W rating exceeds GR-1089-CORE Class B immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC12 | Lower 600 W PPPM rating; 22 V clamping at 30 A; SOD-123FL package | Targeted for space-constrained, lower-energy consumer applications | Select when board area is critical and surge threat level is below ISO 7637-2 Pulse 1/2 |
| 1.5KE12A | Through-hole DO-201 package; identical 12 V VWM, but 19.9 V VC at 75 A; higher RθJA | Used where manual assembly or legacy through-hole infrastructure remains | Choose only if SMT capability is unavailable; requires larger PCB real estate and thermal relief |
Compared with SAC12 and 1.5KE12A, the SMCJ12A-E3/57T delivers superior surge handling in a compact SMT package with optimized thermal resistance - making it the preferred choice for modern automotive and industrial designs requiring high-reliability, automated production-ready TVS protection.
Availability
SMCJ12A-E3/57T is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, and telecom power systems requiring stable component supply, RoHS compliance, and AEC-Q101 traceability options.
Supply support for SMCJ12A-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 application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments - including automotive, industrial, and telecom infrastructure where robustness and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of the SMCJ12A-E3/57T at its rated peak pulse current?
The SMCJ12A-E3/57T has a maximum clamping voltage (VC) of 19.9 V at 75.4 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream 12 V system components. The SMCJ12A-E3/57T maintains this clamping performance across its full operating temperature range.
Is the SMCJ12A-E3/57T suitable for automotive applications?
Yes - while the base SMCJ12A-E3/57T is commercial-grade, Vishay offers AEC-Q101 qualified variants (e.g., SMCJ12AHE3) with identical electrical specs and enhanced reliability testing. The SMCJ12A-E3/57T itself meets MSL Level 1, uses matte tin plating compliant with J-STD-002, and supports −55 °C to +150 °C operation - all foundational requirements for automotive deployment. For certified use, specify the HE3 suffix variant of the SMCJ12A-E3/57T.
How does the SMCJ12A-E3/57T differ from bidirectional TVS diodes like SMCJ12CA?
The SMCJ12A-E3/57T is unidirectional and features a cathode band for polarity identification, allowing it to block 12 V in reverse bias while clamping positive transients. In contrast, SMCJ12CA is bidirectional with no polarity marking and clamps transients of either polarity - making it suitable for AC lines or differential signals. The SMCJ12A-E3/57T provides tighter leakage control (<5 µA) and is preferred for DC rail protection where reverse conduction must be avoided.
What is the thermal resistance of the SMCJ12A-E3/57T, and how does it affect PCB layout?
The SMCJ12A-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To maintain safe junction temperatures under repetitive surge conditions, PCB layout must provide these minimum pad areas and avoid excessive trace length or isolation. The SMCJ12A-E3/57T also has RθJL = 15 °C/W, indicating efficient heat transfer to solder joints - reinforcing the need for solid thermal vias and ground plane connectivity.
Can the SMCJ12A-E3/57T replace older 1.5KE series TVS diodes in existing designs?
The SMCJ12A-E3/57T offers identical electrical parameters (VWM = 12 V, VC = 19.9 V) to the through-hole 1.5KE12A but in an SMC surface-mount package. Direct replacement requires PCB redesign due to different footprint and thermal pad requirements. However, the SMCJ12A-E3/57T improves surge robustness (same PPPM), enables automated assembly, and reduces board space - making it a strategic upgrade where layout revision is feasible. Always verify thermal performance with the new pad layout for the SMCJ12A-E3/57T.
SMCJ12A-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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 75.4A
- 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)
SMCJ12A-E3/57T FAQ
1.How can I place an order for SMCJ12A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12A-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 SMCJ12A-E3/57T reliable?
The price and inventory of SMCJ12A-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 SMCJ12A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ12A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12A-E3/57T?
SMCJ12A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12A-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 SMCJ12A-E3/57T?
For technical support, including SMCJ12A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12A-E3/57T requirements.
6.How does Aetrix verify that SMCJ12A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ12A-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 SMCJ12A-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ12A-E3/57T?
All SMCJ12A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12A-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 SMCJ12A-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ12A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12A-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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
