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Vishay General Semiconductor - Diodes Division SMCJ20A-E3/9AT
- Part No.:
- SMCJ20A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20A-E3/9AT.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,894
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Product details
Overview
SMCJ20A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 20 V standoff voltage, 32.4 V clamping voltage at 46.3 A peak pulse current, and 1500 W peak pulse power rating under 10/1000 μs waveform. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power supply rails.
For engineers reviewing the SMCJ20A-E3/9AT datasheet, SMCJ20A-E3/9AT pinout, SMCJ20A-E3/9AT application, or SMCJ20A-E3/9AT equivalent, key selection criteria include unidirectional polarity, 22.2–24.5 V breakdown voltage range at 1 mA test current, 1.0 μA max reverse leakage at 20 V, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS diode operates as a clamping device triggered by overvoltage events exceeding its breakdown threshold, diverting transient energy to ground while limiting downstream voltage to ≤32.4 V. Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance.
Designed for automated SMT placement on PCBs with 8.0 mm × 8.0 mm copper pads per terminal, it meets MSL Level 1 per J-STD-020 and supports peak forward surge current up to 200 A (8.3 ms half-sine), with thermal resistance of 75 °C/W junction-to-ambient and 15 °C/W junction-to-lead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VWM) | 20 V - Maximum continuous reverse operating voltage before clamping initiates |
| Breakdown Voltage (VBR) | 22.2–24.5 V at 1 mA - Confirmed avalanche conduction onset range for reliable triggering |
| Clamping Voltage (VC) | 32.4 V at 46.3 A IPPM - Peak voltage seen by protected circuit during 10/1000 μs surge |
| Peak Pulse Power (PPPM) | 1500 W - Energy-handling capacity for transient suppression without failure |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm body and matte tin leads |
| Operating Temperature | -55 °C to +150 °C - Validated junction temperature range for automotive and industrial environments |
| RoHS Compliance | E3 suffix - Lead-free, RoHS-compliant commercial-grade construction per JEDEC standards |
Pinout & Package
SMCJ20A-E3/9AT uses the standard SMC (DO-214AB) package: two-terminal unidirectional device with cathode band marking on the case. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, rated for 260 °C peak reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point | Connected to protected line; reverse-biased during normal operation; conducts to ground during overvoltage |
| Anode (non-banded end) | GND reference terminal | Connected to system ground plane; completes clamping path during transient events |
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 consistent avalanche performance, long-term reliability, and reduced parameter drift over time |
| 1500 W peak pulse power | Supports robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V DC rails |
| Fast response time & low clamping ratio | Sub-nanosecond turn-on and VC/VBR ≈ 1.45 enable tight voltage margin control for 3.3 V/5 V logic interfaces |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing without moisture sensitivity concerns |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12 V/24 V battery rail protection in engine control units and body electronics modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between power input and DC-DC converter input stage. Use Value: Limits transients to ≤32.4 V, preventing damage to downstream LDOs and microcontrollers rated for 36 V absolute maximum. |
Use Scenario: CAN bus or analog sensor (e.g., pressure, temperature) signal lines in factory automation PLCs subject to ESD and inductive switching noise. IC Role / Device Role / Timing Role: Point-of-entry transient suppressor mounted directly at connector interface before signal conditioning amplifier. Use Value: Clamps fast-rising ESD events (<1 ns rise time) with <1.0 μA leakage at 20 V, preserving signal integrity in 0–10 V analog channels. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeds |
Use Scenario: Secondary-side 19 V DC output protection in laptop AC/DC adapters vulnerable to surge coupling from primary side or external connectors. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across output capacitor terminals to absorb repetitive line transients. Use Value: Withstands 1500 W peak pulses and maintains 20 V nominal standoff, enabling compliance with UL 62368-1 transient immunity requirements. |
Use Scenario: -48 V DC telecom power distribution boards where lightning-induced surges threaten remote radio head power inputs. IC Role / Device Role / Timing Role: High-power unidirectional suppressor installed upstream of DC-DC converters feeding baseband processors. Use Value: Delivers 46.3 A peak pulse current handling at 32.4 V clamping, meeting Telcordia GR-1089-CORE Level 3 surge immunity thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC20A-TB | Same 20 V VWM, but lower 1000 W PPPM and higher 35.5 V VC at 31.0 A; TO-220AC package | Requires through-hole mounting and larger board area; better suited for heatsinked high-repetition-rate scenarios | Select when thermal management via heatsink is available and SMT footprint is not constrained |
| 1.5KE20A | Same electrical specs but axial DO-15 package; 1.5 kW rating, 32.4 V VC, but higher RθJA (~100 °C/W) | Limited to low-density boards; unsuitable for automated assembly; lower power derating above 25 °C | Choose only for legacy through-hole designs or prototyping where SMC footprint is unavailable |
Compared with SAC20A-TB and 1.5KE20A, SMCJ20A-E3/9AT offers superior SMT manufacturability, tighter thermal resistance (75 °C/W), and optimized layout efficiency for space-constrained automotive and telecom modules-without sacrificing clamping performance or surge rating.
Availability
SMCJ20A-E3/9AT is available at Aetrix Electronics and suitable for automotive power rails, industrial sensor interfaces, consumer adapter outputs, and telecom DC feeds requiring stable component supply across extended production lifecycles.
Supply support for SMCJ20A-E3/9AT 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, precision, and application-specific optimization.
The SMCJ series targets high-energy transient suppression in harsh environments, engineered for automotive AEC-Q101 readiness, industrial surge immunity, and compact SMT integration in power and signal paths.
FAQ
What is the breakdown voltage range for SMCJ20A-E3/9AT?
The SMCJ20A-E3/9AT has a guaranteed breakdown voltage (VBR) range of 22.2 V to 24.5 V at 1 mA test current, measured per ANSI/IEEE C62.35. This range ensures consistent avalanche initiation across manufacturing lots and temperature extremes, critical for predictable clamping behavior in 20 V nominal systems.
Is SMCJ20A-E3/9AT RoHS-compliant and halogen-free?
Yes, the "E3" suffix in SMCJ20A-E3/9AT indicates RoHS-compliant construction with lead-free terminations. However, it is not halogen-free; that designation requires the "M3" suffix (e.g., SMCJ20A-M3/9AT). Both meet JESD 201 Class 2 whisker resistance and J-STD-002 solderability standards.
Can SMCJ20A-E3/9AT be used in bidirectional configurations?
No - SMCJ20A-E3/9AT is strictly unidirectional, identified by the "A" suffix and cathode band marking. For bidirectional operation, select the "CA" variant (e.g., SMCJ20CA), which provides symmetrical clamping in both polarities and omits polarity marking.
What is the maximum allowable reverse leakage current for SMCJ20A-E3/9AT?
At its 20 V standoff voltage (VWM) and TA = 25 °C, SMCJ20A-E3/9AT exhibits a maximum reverse leakage current (ID) of 1.0 μA. This ultra-low leakage preserves efficiency in always-on circuits and prevents false triggering in high-impedance sensor bias networks.
How does the SMC (DO-214AB) package of SMCJ20A-E3/9AT affect thermal performance?
The SMC package delivers a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads - significantly better than axial packages like DO-15. This enables higher sustained power dissipation and improved reliability in compact, thermally dense layouts where SMCJ20A-E3/9AT is deployed.
SMCJ20A-E3/9AT 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):
- 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)
SMCJ20A-E3/9AT FAQ
1.How can I place an order for SMCJ20A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20A-E3/9AT 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 SMCJ20A-E3/9AT reliable?
The price and inventory of SMCJ20A-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ20A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ20A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20A-E3/9AT?
SMCJ20A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20A-E3/9AT 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 SMCJ20A-E3/9AT?
For technical support, including SMCJ20A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20A-E3/9AT requirements.
6.How does Aetrix verify that SMCJ20A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ20A-E3/9AT 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 SMCJ20A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ20A-E3/9AT?
All SMCJ20A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20A-E3/9AT, 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 SMCJ20A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ20A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20A-E3/9AT Tags
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