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Vishay General Semiconductor - Diodes Division SMCJ120CAHE3/9AT
- Part No.:
- SMCJ120CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120CAHE3/9AT.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,141
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Product details
Overview
SMCJ120CAHE3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 1500 W peak pulse power rating, 193 V maximum clamping voltage at 7.8 A peak pulse current, and 120 V standoff voltage. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive and industrial power electronics against inductive switching transients and lightning-induced surges.
For engineers reviewing the SMCJ120CAHE3/9AT datasheet, SMCJ120CAHE3/9AT pinout, SMCJ120CAHE3/9AT application, or SMCJ120CAHE3/9AT equivalent, this device is selected for robust bidirectional ESD/surge immunity in 120 V DC bus monitoring, automotive body control modules, and industrial I/O interface protection where AEC-Q101 qualification, low clamping ratio, and MSL Level 1 reflow compatibility are required.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at 120 V), while the 150 °C max junction temperature supports operation in under-hood automotive environments.
The device delivers 1500 W peak pulse power handling per 10/1000 μs waveform when mounted on 8.0 mm × 8.0 mm copper pads, with thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), supporting reliable power dissipation in compact PCB layouts without external heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VWM) | 120 V - Maximum continuous reverse operating voltage before clamping begins; sets protection threshold for 120 V DC systems. |
| Breakdown Voltage (VBR) | 133–147 V at 1 mA - Confirmed minimum/maximum voltage at which device enters avalanche conduction; defines clamping onset window. |
| Clamping Voltage (VC) | 193 V at 7.8 A IPPM - Maximum voltage seen across protected circuit during 10/1000 μs surge; determines stress on downstream components. |
| Peak Pulse Power (PPPM) | 1500 W - Energy-handling capability under standardized surge waveform; enables protection against IEC 61000-4-5 Level 4 surges. |
| Leakage Current (ID) | ≤1.0 μA at 120 V - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| Operating Temperature | -55 °C to +150 °C - Full AEC-Q101 qualified range supports under-hood automotive deployment and industrial ambient extremes. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place and J-STD-020 reflow. |
Pinout & Package
SMCJ120CAHE3/9AT uses the SMC (DO-214AB) package: a two-terminal, non-polarized surface-mount case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bidirectional construction means no cathode/anode marking; terminals are functionally identical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Surge Input / Protected Line | Connects to line requiring transient suppression (e.g., CAN bus, sensor supply); symmetrical with Terminal 2. |
| Terminal 2 | Surge Input / Protected Line | Completes bidirectional clamping path; no polarity assignment - interchangeable with Terminal 1 in layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - suitable for BCM, ADAS sensors, and powertrain ECUs. |
| Low Incremental Surge Resistance | Enables tight clamping (193 V at 7.8 A) with minimal voltage overshoot, reducing stress on downstream MOSFETs and microcontrollers. |
| MSL Level 1 Rating | Compatible with standard lead-free reflow profiles up to 260 °C peak, eliminating moisture sensitivity handling requirements. |
| Glass-Passivated Junction | Ensures stable VBR over lifetime and improved resistance to humidity-induced parameter drift in harsh industrial environments. |
| UL 94 V-0 Mold Compound | Flame-retardant encapsulation meets safety standards for enclosed automotive and industrial enclosures. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24/48 V DC Power Rail |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and relay driver outputs from load dump and alternator ripple in vehicle door modules. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across power input and signal lines to absorb 100 V–150 V transients within nanoseconds. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V logic ICs by limiting transient voltage to ≤193 V while maintaining <1 μA leakage at 120 V nominal rail. |
Use Scenario: Safeguarding PLC analog input channels connected to 4–20 mA sensors exposed to field wiring surges in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between signal line and ground to shunt induced common-mode transients before reaching precision ADC front-end. Use Value: Maintains signal fidelity with ≤1.0 μA leakage at 48 V system level and clamps 1 kV/500 A surges to <200 V, preserving measurement accuracy and isolation barrier integrity. |
| Telecom Remote Radio Unit (RRU) Power Interface | EV Onboard Charger (OBC) Auxiliary Supply |
|
Use Scenario: Shielding 48 V DC feed lines powering remote cellular base station radios from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC/DC converters and PMICs, rated for repeated 1500 W pulses. Use Value: Delivers 1500 W peak pulse power handling with 75 °C/W thermal resistance, enabling direct PCB mounting without heatsink in space-constrained RRU enclosures. |
Use Scenario: Protecting 12 V auxiliary supply rails feeding MCU, CAN transceivers, and fan controllers in electric vehicle onboard chargers. IC Role / Device Role / Timing Role: Bidirectional clamping device across 12 V rail and chassis ground to suppress coupled transients from high-voltage battery switching noise. Use Value: AEC-Q101 qualification and -55 °C to +150 °C operation ensure reliability during OBC thermal cycling, while 193 V clamping prevents brownout or reset events in critical control circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120A-E3/57T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), unidirectional only. | Limited to lower-energy surges; unsuitable for automotive AEC-Q101 or high-power industrial use. | Select only for cost-sensitive consumer applications with <400 W surge exposure and no bidirectional requirement. |
| SMCJ120AHE3/9AT | Unidirectional variant; same VWM/VBR/VC/PPPM but requires correct polarity placement and lacks AC-line symmetry. | Cannot protect floating or AC-coupled signals; adds design risk if polarity misrouted during assembly. | Choose only when protecting single-polarity DC rails where cathode orientation is strictly controlled and bidirectional failure modes are excluded. |
Compared with SMAJ120A-E3/57T and SMCJ120AHE3/9AT, the SMCJ120CAHE3/9AT uniquely combines 1500 W surge capacity, bidirectional symmetry, AEC-Q101 qualification, and SMC package thermal performance - making it the sole option for robust, polarity-agnostic protection in automotive and high-reliability industrial systems.
Availability
SMCJ120CAHE3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom remote radio units requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMCJ120CAHE3/9AT 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is engineered for high-energy transient suppression in demanding automotive, industrial, and telecom infrastructure applications - delivering consistent clamping performance, AEC-Q101 validation, and robust packaging for automated manufacturing.
FAQ
What is the clamping voltage of SMCJ120CAHE3/9AT at its rated peak pulse current?
The SMCJ120CAHE3/9AT has a maximum clamping voltage (VC) of 193 V at 7.8 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value is confirmed in the Vishay datasheet Document Number 88394, page 2, and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ120CAHE3/9AT maintains this clamping performance across its full operating temperature range.
Is SMCJ120CAHE3/9AT suitable for automotive applications?
Yes, SMCJ120CAHE3/9AT is AEC-Q101 qualified (noted in the ordering information section and thermal characteristics footnote on page 3 of the datasheet), with operating temperature range from -55 °C to +150 °C and MSL Level 1 reflow compatibility. These attributes make the SMCJ120CAHE3/9AT appropriate for under-hood and cabin-mounted automotive electronics including body control modules, lighting drivers, and sensor interfaces.
How does the bidirectional design of SMCJ120CAHE3/9AT affect its circuit implementation?
The bidirectional design of SMCJ120CAHE3/9AT eliminates polarity constraints - both terminals are functionally identical, and no cathode band marking is present. This allows direct placement across AC-coupled lines, differential buses like CAN or RS-485, or floating sensor inputs without orientation verification. The SMCJ120CAHE3/9AT provides symmetrical clamping in either direction, simplifying layout and reducing assembly errors compared to unidirectional alternatives.
What is the standoff voltage rating of SMCJ120CAHE3/9AT, and how does it relate to system voltage?
The standoff voltage (VWM) of SMCJ120CAHE3/9AT is 120 V, meaning it remains in high-impedance state below this DC or RMS voltage. This rating is selected to sit safely above normal operating voltage of 120 V DC systems (e.g., commercial vehicle auxiliary power, telecom 48 V boost stages), ensuring no leakage-induced loading while providing margin before clamping initiates. The SMCJ120CAHE3/9AT's 120 V VWM aligns precisely with such nominal rail voltages.
Does SMCJ120CAHE3/9AT require a heatsink for standard operation?
No, SMCJ120CAHE3/9AT does not require an external heatsink for transient suppression duty cycles. Its thermal resistance is specified at 75 °C/W (junction-to-ambient) when mounted on 8.0 mm × 8.0 mm copper pads, and its 6.5 W steady-state power dissipation rating is intended for continuous operation - far exceeding typical TVS leakage power (<120 μW at 120 V). The SMCJ120CAHE3/9AT relies on PCB copper area for thermal management, not added heatsinks.
SMCJ120CAHE3/9AT 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- 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)
SMCJ120CAHE3/9AT FAQ
1.How can I place an order for SMCJ120CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120CAHE3/9AT 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 SMCJ120CAHE3/9AT reliable?
The price and inventory of SMCJ120CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ120CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120CAHE3/9AT?
SMCJ120CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120CAHE3/9AT 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 SMCJ120CAHE3/9AT?
For technical support, including SMCJ120CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120CAHE3/9AT requirements.
6.How does Aetrix verify that SMCJ120CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ120CAHE3/9AT 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 SMCJ120CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ120CAHE3/9AT?
All SMCJ120CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120CAHE3/9AT, 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 SMCJ120CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ120CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120CAHE3/9AT Tags
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