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Taiwan Semiconductor Corporation SMCJ120AH
- Part No.:
- SMCJ120AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120AH.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,394
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Product details
Overview
SMCJ120AH 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), 133–147V breakdown voltage (VBR), and 193V maximum clamping voltage (VC) at 8.1A peak impulse current. It delivers AEC-Q101 qualification and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and ESD protection in power rails.
For engineers reviewing the SMCJ120AH datasheet, SMCJ120AH pinout, SMCJ120AH application, or SMCJ120AH equivalent, this page provides verified electrical parameters, thermal performance data, polarity marking details, clamping behavior under 10/1000μs surge, and direct alternatives validated for industrial and automotive board-level surge immunity design.
Technical Context
The SMCJ120AH operates as a unidirectional avalanche diode, activated only during reverse overvoltage events above its VBR threshold. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1µA at 120V), while fast response time (<1.0ps) enables effective suppression of ESD and lightning-induced transients.
Thermally, it features RθJA = 55°C/W and RθJC = 10°C/W, supporting 5W steady-state dissipation at 25°C ambient. The device is rated for junction temperatures from –55°C to +150°C and complies with JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 133 V / 147 V @ 1 mA - Confirmed avalanche onset range under standardized test conditions |
| VC @ IPPM | 193 V @ 8.1 A - Clamped voltage during 10/1000μs surge, defining worst-case rail overshoot |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient, derated above 25°C |
| IR @ VWM | <1 µA - Reverse leakage ensuring minimal standby power loss and signal integrity |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 55 °C/W - Thermal resistance from junction to ambient, guiding PCB copper area requirements |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, cathode band marked on case for unidirectional polarity identification. Weight: 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail in unidirectional TVS configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V supply); conducts when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress |
| ISO 7637-2 compliance | Withstands defined load-dump (Pulse 2b), coupled transients (Pulse 1/3a/3b), and switching noise |
| Glass passivated junction | Ensures stable VBR tolerance and long-term parameter drift <±5% over lifetime |
| Fast response time | <1.0 ps - Limits voltage overshoot before protection engages, critical for IC input stage safety |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed ECUs against alternator load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between supply rail and chassis ground to clamp transients exceeding 120V. Use Value: Limits peak rail voltage to ≤193V during 1500W surges, preventing damage to downstream DC-DC converters and microcontrollers. | Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to field wiring transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24V sensor input lines to absorb induced surges from relay coil de-energization. Use Value: Maintains signal integrity by clamping transients within 10/1000μs without latch-up, preserving input logic thresholds. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Shielding PoE-powered equipment front-end circuits from Ethernet cable ESD and lightning coupling. IC Role / Device Role / Timing Role: Secondary-level TVS on 48V DC feed lines after primary surge arrestors. Use Value: Provides sub-200V clamping margin below 50V-rated interface ICs, meeting IEC 61000-4-2 Level 4. | Use Scenario: Protecting DC-link monitoring circuits in solar inverters from grid-switching transients. IC Role / Device Role / Timing Role: High-energy TVS on 600–1000V DC bus sensing nodes to prevent overvoltage damage to isolated amplifiers. Use Value: Withstands repetitive 1500W pulses without degradation, supporting 20-year field life in outdoor installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120A | 600W rating, SMB package (smaller footprint), higher VC (209V @ 5.8A) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 2b load dump | Select when space-constrained and surge energy ≤600W; verify clamping margin with downstream IC VDS(max) |
| 1.5KE120A | Through-hole TO-218 package, same 120V VWM, but 1500W rating and 200V VC @ 7.5A | Not AEC-Q101 qualified; lacks ISO 7637-2 validation and automotive process controls | Acceptable for industrial non-automotive use where manual assembly is preferred and qualification not required |
Compared with SMCJ120AH, SMBJ120A offers smaller size but reduced surge capacity and clamping performance, while 1.5KE120A matches power rating but lacks automotive qualification and surface-mount compatibility-making SMCJ120AH the only choice for AEC-Q101-compliant, high-reliability SMT designs.
Availability
SMCJ120AH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC I/O conditioning, and telecom power feed hardening requiring stable component supply across multi-year production cycles.
Supply support for SMCJ120AH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMCJ series was engineered specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and robust thermal performance in compact SMC packages.
FAQ
What is the clamping voltage of SMCJ120AH and how is it measured?
The SMCJ120AH has a maximum clamping voltage (VC) of 193 V, measured at 8.1 A peak impulse current (IPPM) using the standard 10/1000 μs double-exponential surge waveform per Fig.5 in the datasheet. This value defines the upper voltage limit imposed on the protected circuit during a full-rated 1500W transient event, and is guaranteed across the operating temperature range.
Is SMCJ120AH bidirectional or unidirectional?
SMCJ120AH is a unidirectional TVS diode, indicated by the absence of "C" or "CA" prefix/suffix (e.g., SMCJ120CH would be bidirectional). Its cathode band marking identifies polarity, and it conducts only during reverse overvoltage events-forward conduction is limited to VF ≈ 3.5 V at 100 A, per datasheet Note 2.
Does SMCJ120AH meet AEC-Q101 and ISO 7637-2 requirements?
Yes, SMCJ120AH is explicitly AEC-Q101 qualified and certified to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test profiles. These qualifications are documented in the product family datasheet (Version A2102) and confirmed via TSC's automotive reliability test reports for the SMCJx(A)H series.
What is the thermal resistance and maximum power dissipation of SMCJ120AH?
SMCJ120AH has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case resistance (RθJC) of 10°C/W. Its steady-state power dissipation (PD) is rated at 5 W at 25°C ambient, derating linearly above that temperature per Fig.2 in the datasheet-critical for thermal pad layout and airflow planning.
How does SMCJ120AH differ from SMCJ120H?
SMCJ120AH has tighter breakdown voltage tolerance: 133–147 V vs. SMCJ120H's 133–163 V. This results in more consistent clamping behavior and lower VC (193 V vs. 214 V), improving protection margin for sensitive 150V-rated components. Both share identical package, power rating, and qualification status.
SMCJ120AH 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:
- 193V
- Current - Peak Pulse (10/1000µs):
- 8.1A
- 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)
SMCJ120AH FAQ
1.How can I place an order for SMCJ120AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120AH 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 SMCJ120AH reliable?
The price and inventory of SMCJ120AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120AH is usually 5 days.
3.What payment methods are accepted for SMCJ120AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120AH?
SMCJ120AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120AH 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 SMCJ120AH?
For technical support, including SMCJ120AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120AH requirements.
6.How does Aetrix verify that SMCJ120AH is sourced from the original manufacturer or authorized distributors?
All SMCJ120AH 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 SMCJ120AH meets industry standards.
7.What is the process for return or replacement of SMCJ120AH?
All SMCJ120AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120AH, 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 SMCJ120AH part is unused and in its original packaging.
Return procedure for SMCJ120AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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