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Vishay General Semiconductor - Diodes Division SMCJ12AHE3/9AT
- Part No.:
- SMCJ12AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12AHE3/9AT.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,323
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Product details
Overview
SMCJ12AHE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 12 V standoff voltage (VWM), 13.3–14.7 V breakdown voltage (VBR at 1 mA), 19.9 V clamping voltage (VC) at 75.4 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMCJ12AHE3/9AT datasheet, SMCJ12AHE3/9AT pinout, SMCJ12AHE3/9AT application, or SMCJ12AHE3/9AT equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification for automotive use, RoHS-compliant matte tin plating, MSL Level 1 moisture sensitivity, and compatibility with automated placement on PCBs requiring robust transient suppression up to 1500 W.
Technical Context
The SMCJ12AHE3/9AT operates as a clamping-type TVS diode that enters avalanche conduction when reverse voltage exceeds its breakdown threshold, limiting transient energy to safe levels across protected circuit nodes. Its glass-passivated junction ensures stable electrical characteristics and low incremental surge resistance under repetitive surge stress.
Designed for surface-mount implementation on standard 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, it delivers thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling reliable operation up to 150 °C junction temperature while maintaining clamping performance during 8.3 ms half-sine surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins; defines upper limit of normal signal swing in protected line. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Confirmed breakdown range ensuring predictable turn-on behavior across production lot and temperature. |
| VC @ IPPM | 19.9 V at 75.4 A - Clamped voltage during 1500 W transient event; determines maximum stress imposed on downstream IC or MOSFET. |
| PPPM | 1500 W - Peak pulse power handling capability with 10/1000 µs waveform; quantifies transient energy absorption capacity. |
| IFSM | 200 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports protection of power rails subject to high-current inrush or fault conditions. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures without derating. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with cathode band marking; compatible with JEDEC-compliant reflow profiles and automated pick-and-place equipment. |
Pinout & Package
SMCJ12AHE3/9AT uses the SMC (DO-214AB) package: a rectangular surface-mount case with two terminals, cathode marked by a band on one end. Leads are matte tin plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side of protected line; establishes polarity-dependent clamping direction in unidirectional configuration. |
| Cathode | Avalanche conduction node / Clamping output | Marked with band; connected to higher-potential side (e.g., VCC, signal line); conducts transient current to ground or rail during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing per AEC specification. |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and leakage current under thermal and environmental stress. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision and reducing stress on protected components. |
| MSL Level 1 (260 °C peak) | Enables standard lead-free reflow assembly without pre-baking; eliminates moisture-related popcorning risk. |
| 1500 W peak pulse power | Provides robust protection against ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surge events in 12 V systems. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs, body control modules, and infotainment systems from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and ground to clamp spikes up to ±100 V within nanoseconds. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers by limiting clamped voltage to 19.9 V during 1500 W surges. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation PLCs from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS mounted directly at connector interface to shunt transients before reaching ADC input or op-amp front-end. Use Value: Maintains signal integrity with <1 µA leakage at 12 V, enabling sub-mV measurement accuracy while surviving 8 kV contact ESD per IEC 61000-4-2. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
Use Scenario: Safeguarding PoE-powered network switches and base stations against lightning-induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC converter, sized for 1500 W pulse handling and thermal dissipation on 8 mm² copper pads. Use Value: Enables compliance with IEC 61000-4-5 Level 4 (4 kV line-earth) without secondary crowbar circuits or fusing delays. | Use Scenario: Adding transient immunity to USB 2.0 data lines and VBUS in portable speakers, docking stations, and smart home hubs. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS rail to suppress hot-plug spikes and adapter overvoltage events. Use Value: Delivers 19.9 V clamping at 75.4 A with 0.083 %/°C VBR tempco, ensuring consistent trip point across -40 to +85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12AHE3/52T | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM/VC specs | Reduced surge margin; suitable only for non-automotive, lower-energy transients | Select when board space is constrained and peak surge energy remains below 600 W. |
| SMCJ12CAHE3/9AT | Bidirectional variant; identical VWM, VBR, VC, and PPPM, but symmetrical clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal may occur | Choose for RS-485, CAN FD, or audio lines needing bidirectional protection without polarity constraints. |
Compared with SMBJ12AHE3/52T and SMCJ12CAHE3/9AT, the SMCJ12AHE3/9AT provides the highest surge energy handling in a standardized automotive-qualified SMC package, making it optimal for primary protection in 12 V systems where unidirectional clamping and AEC-Q101 compliance are mandatory.
Availability
SMCJ12AHE3/9AT is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom power supply protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMCJ12AHE3/9AT 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, efficiency, and application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform engineered for high-energy transient suppression in harsh environments-specifically targeting automotive, industrial, and telecom applications demanding AEC-Q101 qualification and 1500 W surge capability.
FAQ
What is the clamping voltage of SMCJ12AHE3/9AT at its rated peak pulse current?
The SMCJ12AHE3/9AT has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current of 75.4 A using a 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMCJ12AHE3/9AT maintains this clamping performance across its specified operating temperature range.
Is SMCJ12AHE3/9AT qualified for automotive applications?
Yes, the SMCJ12AHE3/9AT is AEC-Q101 qualified, as confirmed by Vishay's documentation and ordering code suffix "HE3", which denotes RoHS-compliant and AEC-Q101 qualified variants. It undergoes rigorous stress testing-including temperature cycling, humidity bias, and mechanical shock-to ensure reliability in automotive under-hood and cabin environments. The SMCJ12AHE3/9AT is explicitly recommended for ECU, body control module, and infotainment system protection.
What does the "9AT" suffix indicate in SMCJ12AHE3/9AT?
"9AT" is Vishay's preferred package code denoting 13-inch diameter plastic tape and reel packaging with a base quantity of 3500 units per reel. This format supports high-volume automated assembly and is compatible with standard SMT pick-and-place equipment. The SMCJ12AHE3/9AT also features matte tin-plated leads meeting J-STD-002 and JESD 22-B102 solderability standards, and complies with JESD 201 Class 2 whisker resistance requirements.
How does SMCJ12AHE3/9AT differ from bidirectional SMCJ12CAHE3/9AT?
The SMCJ12AHE3/9AT is unidirectional, with polarity-sensitive clamping (cathode-banded) optimized for DC rail protection like 12 V battery inputs. In contrast, SMCJ12CAHE3/9AT is bidirectional, offering symmetrical clamping in both directions-essential for AC-coupled or floating signal lines such as RS-485 or CAN. Both share identical VWM, VBR, VC, and PPPM, but the SMCJ12AHE3/9AT cannot replace the CA version in polarity-agnostic applications.
What is the thermal resistance of SMCJ12AHE3/9AT and how does it affect layout?
The SMCJ12AHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W when mounted on minimum recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To maintain safe junction temperatures under repeated surges, PCB layout must provide adequate copper area and thermal vias-especially critical in automotive applications where ambient temperatures exceed 85 °C. The SMCJ12AHE3/9AT's thermal performance directly impacts its ability to sustain multiple transient events without degradation.
SMCJ12AHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ12AHE3/9AT FAQ
1.How can I place an order for SMCJ12AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12AHE3/9AT 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 SMCJ12AHE3/9AT reliable?
The price and inventory of SMCJ12AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ12AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12AHE3/9AT?
SMCJ12AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12AHE3/9AT 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 SMCJ12AHE3/9AT?
For technical support, including SMCJ12AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12AHE3/9AT requirements.
6.How does Aetrix verify that SMCJ12AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ12AHE3/9AT 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 SMCJ12AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ12AHE3/9AT?
All SMCJ12AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12AHE3/9AT, 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 SMCJ12AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ12AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12AHE3/9AT Tags
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