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Vishay General Semiconductor - Diodes Division SMCJ20-E3/9AT
- Part No.:
- SMCJ20-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20-E3/9AT.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,014
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Product details
Overview
SMCJ20-E3/9AT 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), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 32.4 V clamping voltage (VC) at 46.3 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and I/O lines in automotive ECUs and industrial motor drives.
For engineers reviewing the SMCJ20-E3/9AT datasheet, SMCJ20-E3/9AT pinout, SMCJ20-E3/9AT application, or SMCJ20-E3/9AT equivalent, key selection criteria include verified clamping performance under 10/1000 µs surge, AEC-Q101 qualification for automotive use, thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM), while the DO-214AB package supports high surge handling (200 A IFSM) and meets MSL Level 1 reflow requirements (260 °C peak).
Clamping behavior is defined per ANSI/IEEE C62.35, with VC measured at IPPM under standardized 10/1000 µs waveform. Thermal derating follows Fig. 2: power dissipation drops linearly above TA = 25 °C, reaching ~50% at 100 °C ambient, enabling reliable operation in under-hood automotive environments up to TJ = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line voltage. |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - guaranteed avalanche initiation range; ensures consistent turn-on across production lots. |
| VC @ IPPM | 32.4 V at 46.3 A - clamped voltage during full 1500 W surge; defines worst-case stress on downstream ICs. |
| PPPM | 1500 W - peak pulse power handling with 10/1000 µs waveform; validates immunity to ISO 7637-2 Pulse 1/2/5a surges. |
| TJ max. | +150 °C - maximum junction temperature; enables deployment in engine control modules without active cooling. |
| RθJA | 75 °C/W - thermal resistance junction-to-ambient on standard pad layout; informs board-level thermal design margin. |
Pinout & Package
SMCJ20-E3/9AT uses the DO-214AB (SMCJ) surface-mount package: molded epoxy case with J-bend leads, 0.320" (8.13 mm) body length, 0.246" (6.22 mm) width, and cathode band marking on the anode-side end. Matte tin-plated leads comply with J-STD-002 solderability and JESD 22-B102 mechanical durability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode (unmarked end) | Reference/ground return path | Typically tied to system ground plane; completes shunt path for transient energy dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for ECU, ADAS, and body control modules. |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = 1.46) versus legacy TVS devices, reducing voltage overshoot on protected ICs. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C), eliminating bake requirements pre-assembly. |
| Glass-passivated junction | Provides stable VBR tolerance and low leakage (<1 µA) over lifetime, critical for battery-backed or low-power sensor interfaces. |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive I/O Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs in engine control units against load dump and inductive switching transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and DC-DC input, clamping surges within 1 ns. Use Value: Limits voltage seen by downstream regulators to ≤32.4 V during 1500 W pulses, preventing latch-up or gate oxide damage in PMICs. |
Use Scenario: Safeguarding analog sensor inputs (e.g., current sense, position feedback) in variable-frequency drives exposed to EMI and commutation noise. IC Role / Device Role / Timing Role: Low-capacitance TVS on signal lines between motor encoder and controller ASIC, suppressing fast-rising transients. Use Value: Clamps 10/1000 µs surges to 32.4 V while maintaining <1 µA leakage at 20 V, preserving signal integrity in 12-bit ADC front-ends. |
| Telecom Line Interface Protection | Consumer Power Adapter Input Stage |
Use Scenario: Shielding Ethernet PHY power pins and bias rails in PoE-powered switches from lightning-induced surges and AC mains coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on +3.3 V/5 V auxiliary rails feeding PHY ICs and magnetics bias windings. Use Value: Withstands repeated 1500 W surges without degradation, meeting IEC 61000-4-5 Level 4 (4 kV) requirements for telecom infrastructure. |
Use Scenario: Guarding primary-side controller ICs in offline AC-DC adapters against line transients and capacitor discharge spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS across bulk capacitor terminals, absorbing energy from MOV failure or rectifier reverse recovery. Use Value: 200 A IFSM rating handles single half-sine surge events (8.3 ms), preventing catastrophic failure during brownout recovery sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/61T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Limited to lower-energy surges; unsuitable for ISO 7637-2 Pulse 5a or IEC 61000-4-5 Level 4 | Select only for space-constrained consumer applications with <400 W surge exposure. |
| SMCJ20AHE3/9AT | Identical electrical specs but AEC-Q101 qualified (HE3 suffix); same DO-214AB package and marking | Approved for automotive safety-critical systems requiring PPAP documentation and extended reliability validation | Prefer for Tier 1 automotive BOMs where qualification traceability is mandatory. |
Compared with SMCJ20-E3/9AT, SMAJ20A-E3/61T trades surge capacity for footprint reduction, while SMCJ20AHE3/9AT adds formal automotive qualification without altering electrical performance - making the latter a drop-in upgrade for certified designs.
Availability
SMCJ20-E3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial motor drive interfaces, and telecom infrastructure equipment requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ20-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series belongs to Vishay's TRANSZORB® TVS portfolio, engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems demanding AEC-Q101 compliance and repeatable clamping behavior.
FAQ
What is the clamping voltage of SMCJ20-E3/9AT and how is it measured?
The clamping voltage (VC) of SMCJ20-E3/9AT is 32.4 V, measured at 46.3 A peak pulse current (IPPM) using a standardized 10/1000 µs double-exponential waveform per ANSI/IEEE C62.35. This value represents the maximum voltage imposed on the protected circuit during a full-rated surge event, and is confirmed in the Vishay datasheet Document Number 88394, page 2.
Is SMCJ20-E3/9AT suitable for automotive applications?
Yes, SMCJ20-E3/9AT is RoHS-compliant and rated for industrial temperature range (–55 °C to +150 °C), but it is not AEC-Q101 qualified. For automotive applications requiring formal qualification, the functionally identical SMCJ20AHE3/9AT variant should be selected - both share identical electrical specs and DO-214AB packaging.
What does the "E3/9AT" suffix mean in SMCJ20-E3/9AT?
The "E3" suffix indicates RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting J-STD-002 solderability; "9AT" denotes packaging in 13-inch plastic tape-and-reel format with 3500 units per reel. This differs from "57T" (7-inch reel, 850 units) and "HE3" (AEC-Q101 qualified version).
How does SMCJ20-E3/9AT compare to bi-directional TVS diodes like SMCJ20CA?
SMCJ20-E3/9AT is unidirectional and blocks forward current above ~0.7 V, whereas SMCJ20CA is bi-directional with symmetrical clamping in both polarities. The unidirectional version offers lower leakage (<1 µA vs. ≤10 µA for CA types at VWM) and is preferred for DC power rail protection; CA variants suit AC-coupled or floating signal lines.
What PCB layout guidelines apply to SMCJ20-E3/9AT for optimal surge performance?
Mount SMCJ20-E3/9AT on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve specified 1500 W PPPM rating. Keep traces short and wide between the TVS and protected node, minimize loop area to ground, and avoid vias in the surge current path - all per Vishay's recommended pad layout in Document Number 88394, page 4.
SMCJ20-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:
- 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-E3/9AT FAQ
1.How can I place an order for SMCJ20-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20-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 SMCJ20-E3/9AT reliable?
The price and inventory of SMCJ20-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 SMCJ20-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ20-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20-E3/9AT?
SMCJ20-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20-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 SMCJ20-E3/9AT?
For technical support, including SMCJ20-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20-E3/9AT requirements.
6.How does Aetrix verify that SMCJ20-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ20-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 SMCJ20-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ20-E3/9AT?
All SMCJ20-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20-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 SMCJ20-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ20-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20-E3/9AT Tags
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