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Taiwan Semiconductor Corporation SMCJ120H
- Part No.:
- SMCJ120H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120H.pdf
- Description:
- 1500W, 148V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,745
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Product details
Overview
SMCJ120H from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 120V working stand-off voltage (VWM), 133–163V breakdown voltage (VBR), and 214V maximum clamping voltage (VC) at 7.3A peak pulse current. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ120H datasheet, SMCJ120H pinout, SMCJ120H application, or SMCJ120H equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 55°C/W), moisture sensitivity level (MSL 1), and clamping performance under 10/1000μs surge waveforms - all critical for ESD-hardened 12V–48V system design.
Technical Context
The SMCJ120H uses a glass-passivated silicon junction to achieve sub-1ps response time from 0 V to VBR min and <1μA reverse leakage above 10V. Its unidirectional configuration supports DC-biased protection paths with polarity-marked cathode band.
Designed for automotive-grade reliability, it meets AEC-Q101 stress tests and ISO 7637-2 transient immunity requirements across Pulse 1 (inductive load dump suppression), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling noise), with peak power dissipation rated at 1500W for 1ms pulses at TA = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous DC or RMS voltage the device blocks without clamping |
| VBR @ IT=1 mA | 133–163 V - Breakdown initiates within this range, defining turn-on threshold for transient suppression |
| VC @ IPPM=7.3 A | 214 V - Clamped voltage during 10/1000μs surge; limits downstream voltage stress to ≤214 V |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient, derated linearly above 25°C ambient |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; determines temperature rise under steady-state power dissipation |
| IR @ VWM | ≤1 μA - Reverse leakage at 120 V ensures minimal standby power loss in always-on systems |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity indicated by cathode band. Weight: 0.210 g. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side (non-cathode terminal) | Connected to protected line; conducts only during forward surge (e.g., reverse battery events if used bidirectionally with external circuitry) |
| Cathode | Ground/reference side (marked with band) | Connected to system ground or low-impedance return path; defines unidirectional clamping direction from line to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, humidity bias, and mechanical shock per JEDEC standards |
| Glass passivated junction | Enables stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift |
| ISO 7637-2 compliance | Guarantees robustness against real-world automotive transients: load dump (Pulse 2b), inductive switching (Pulse 1), and capacitive coupling (Pulse 3b) |
| MSL 1 rating | Zero floor life limitation - can be stored indefinitely at ≤30°C/60% RH and mounted without baking |
| Fast response time | <1.0 ps from 0 V to VBR min - clamps before sensitive ICs experience overvoltage damage |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24V CAN bus power lines and sensor supply rails in engine control units (ECUs) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and ground to clamp transients exceeding 120V while maintaining low leakage during normal operation. Use Value: Limits clamped voltage to 214V, ensuring downstream regulators and CAN transceivers remain within absolute maximum ratings during ISO 7637-2 Pulse 2b events. | Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Line-side transient suppressor on 24V DC inputs, absorbing 1500W surges without failure or degradation over >10,000 cycles. Use Value: With RθJA = 55°C/W and TJmax = +150°C, sustains repeated 1ms surges in enclosed cabinets up to +85°C ambient without thermal runaway. |
| Telecom DC Power Feeds | Renewable Energy Charge Controllers |
Use Scenario: Shielding PoE-powered equipment front-ends from lightning-induced surges on 48V DC distribution lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side DC bus, coordinated with upstream MOVs to handle multi-staged surge energy. Use Value: 214V clamping voltage ensures compatibility with 48V-rated DC-DC converters and prevents latch-up in Ethernet PHYs during 10/1000μs transients. | Use Scenario: Protecting MPPT charge controller inputs connected to solar panel strings operating up to 150V open-circuit voltage. IC Role / Device Role / Timing Role: Standoff-rated TVS on PV+ rail to absorb reverse-polarity and lightning-induced surges without false triggering during normal IV curve tracking. Use Value: 120V VWM allows safe operation below typical 150VOC, while 214V VC prevents overvoltage damage to MOSFET gate drivers during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120A | 600W rating, SMB package (smaller footprint), lower IPPM (4.3A), higher VC (226V) | Lower power handling limits use to sub-600W surge environments; not suitable for ISO 7637-2 Pulse 1 load dump | Select when board space is constrained and surge energy is limited to IEC 61000-4-5 Level 3 (1kV/2kA) |
| 1.5KE120A | Through-hole TO-218 package, same 1500W rating, but slower response (>1ns), higher IR (5μA), no AEC-Q101 qualification | Lacks automotive qualification and MSL 1 rating; unsuitable for automated SMT assembly or under-hood deployment | Choose only for legacy through-hole designs where rework tolerance and manual assembly are acceptable |
Compared with SMBJ120A and 1.5KE120A, the SMCJ120H provides superior automotive readiness (AEC-Q101 + ISO 7637-2), tighter thermal management (RθJA = 55°C/W vs. ~65°C/W for SMBJ), and lower leakage (<1μA), making it optimal for high-reliability 24V/48V embedded power rails requiring zero-field failures.
Availability
SMCJ120H is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom power feeds, and renewable energy charge controllers requiring stable component supply across extended temperature ranges and high-surge environments.
Supply support for SMCJ120H 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and computing markets.
The SMCJ series targets high-energy transient suppression in harsh environments, with design focus on AEC-Q101 compliance, ISO 7637-2 immunity, and SMT manufacturability for next-generation vehicle electronics and ruggedized industrial controls.
FAQ
What is the clamping voltage of SMCJ120H at its rated peak pulse current?
The SMCJ120H has a maximum clamping voltage (VC) of 214 V at 7.3 A peak pulse current (IPPM) under the standard 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry sees no more than 214 V during worst-case transient events, provided layout minimizes parasitic inductance. The SMCJ120H maintains this clamping performance across its full operating temperature range.
Is SMCJ120H suitable for bidirectional transient protection?
No, the SMCJ120H is a unidirectional TVS diode, designed for DC-biased applications where polarity is fixed (e.g., VBAT to ground). For bidirectional protection, Taiwan Semiconductor offers the SMCJ120AH variant (marked GHG), which provides symmetrical clamping in both directions. Using SMCJ120H in AC or floating systems risks forward conduction and potential failure; always verify polarity alignment before placement.
Does SMCJ120H meet automotive qualification standards?
Yes, the SMCJ120H is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its construction - glass-passivated junction, MSL 1 rating, and −55°C to +150°C operating range - satisfies automotive environmental stress screening. Documentation confirms qualification per revision A2102, making SMCJ120H appropriate for engine bay, chassis, and ADAS module deployments.
What is the thermal resistance of SMCJ120H, and how does it affect PCB layout?
The SMCJ120H has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case (RθJC) of 10°C/W. To maintain TJ ≤ 150°C during repetitive surges, PCB copper area must be optimized: minimum 100 mm² per pad with 2 oz copper and thermal vias to inner ground planes. Layouts ignoring thermal relief may exceed TJmax after just a few 1500W pulses, degrading VBR stability and shortening SMCJ120H service life.
How does the marking code "GHF" correspond to SMCJ120H?
The marking code "GHF" is the laser-etched identifier on the SMCJ120H package body, per Taiwan Semiconductor's ordering specification. It uniquely identifies the 120V unidirectional variant within the SMCJxH family and distinguishes it from SMCJ120AH (marked GHG) and other voltage grades. This code appears alongside green compound (G), date code (YW), and factory code (F); the cathode band indicates polarity. Always cross-check GHF marking against reel labels and certificates of conformance for SMCJ120H traceability.
SMCJ120H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 214V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ120H FAQ
1.How can I place an order for SMCJ120H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120H 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 SMCJ120H reliable?
The price and inventory of SMCJ120H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120H is usually 5 days.
3.What payment methods are accepted for SMCJ120H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120H?
SMCJ120H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120H 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 SMCJ120H?
For technical support, including SMCJ120H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120H requirements.
6.How does Aetrix verify that SMCJ120H is sourced from the original manufacturer or authorized distributors?
All SMCJ120H 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 SMCJ120H meets industry standards.
7.What is the process for return or replacement of SMCJ120H?
All SMCJ120H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120H, 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 SMCJ120H part is unused and in its original packaging.
Return procedure for SMCJ120H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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