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Taiwan Semiconductor Corporation SMBJ120C
- Part No.:
- SMBJ120C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120C.pdf
- Description:
- 600W, 148V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:4,377
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Product details
Overview
SMBJ120C from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in DC power rails and signal lines. It features a 120V working stand-off voltage (VWM), 133–163V breakdown voltage (VBR @ 1mA), 214V maximum clamping voltage (VC @ 2.9A), <1μA leakage at rated VWM, and sub-1ps response time.
For engineers reviewing the SMBJ120C datasheet, SMBJ120C pinout, SMBJ120C application, or SMBJ120C equivalent, key selection criteria include clamping performance under 10/1000µs surges, unidirectional polarity marking, compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and thermal derating above 25°C ambient.
Technical Context
The SMBJ120C operates as a unidirectional avalanche diode, activated when reverse voltage exceeds its VBR range (133–163V). Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1µA at 120V), while the DO-214AA package provides robust thermal dissipation (RθJA = 55°C/W).
It delivers 600W non-repetitive peak pulse power (10/1000µs waveform), clamps transients to ≤214V at 2.9A peak current, and maintains operation across –55°C to +150°C junction temperature. Polarity is marked by a cathode band on the case per JEDEC standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin. |
| VBR min/max | 133 / 163 V @ 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on during overvoltage events. |
| VC @ IPP | 214 V @ 2.9 A - Clamped voltage under 10/1000µs surge; determines protected circuit's maximum stress level. |
| PPK | 600 W - Peak pulse power handling (10/1000µs); defines single-event surge energy absorption capability. |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off; minimizes standby power loss and avoids false triggering. |
| Response time | <1 ps - Avalanche turn-on speed; ensures protection before sensitive ICs experience damaging voltage overshoot. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in high-ambient industrial environments. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-indicated by molded band. Case meets UL 94V-0 flammability rating; matte tin-plated leads comply with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to lower-potential side of protected line (e.g., GND or return rail); completes clamping loop during transient. |
| Cathode | Reverse-biased terminal / Surge shunt node | Connected to higher-potential side (e.g., 120V rail); avalanche conduction occurs here during overvoltage to clamp voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive load-dump and switching transient immunity-no additional external filtering required. |
| Moisture sensitivity level 1 (J-STD-020) | Zero bake requirement before reflow; compatible with standard SMT assembly processes without moisture-related popcorning. |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental regulations and enables use in green electronics manufacturing and end-of-life recycling. |
Applications
| Automotive Power Rail Protection | Industrial DC Power Input Stage |
|---|---|
|
Use Scenario: Protecting 120V DC battery-fed control modules against load dump and alternator transients in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and downstream DC-DC converter input. Use Value: Clamps 120V system surges to ≤214V within <1ps, preventing damage to 200V-rated MOSFETs and gate drivers. |
Use Scenario: Safeguarding programmable logic controllers (PLCs) powered from 120V DC industrial supplies exposed to inductive switching noise. IC Role / Device Role / Timing Role: Primary surge suppression device at main power entry point before EMI filter and bulk capacitor. Use Value: Absorbs 600W pulses without degradation, maintaining <1µA leakage to avoid false resets in low-power sleep modes. |
| LED Driver Overvoltage Clamp | Telecom Line Interface Protection |
|
Use Scenario: Preventing catastrophic failure of constant-current LED drivers during AC/DC adapter output surges or hot-swap events. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output terminals to limit forward-voltage overshoot. Use Value: Sub-1ps response ensures clamping occurs before LED string or driver IC sustains irreversible junction damage. |
Use Scenario: Shielding RS-485 transceivers and isolated power supplies in outdoor telecom cabinets from lightning-induced surges on 120V auxiliary rails. IC Role / Device Role / Timing Role: Secondary-level protection after gas discharge tube (GDT), providing precise low-clamp voltage. Use Value: 214V VC limits stress on 250V-rated isolation barriers and prevents latch-up in ±10V common-mode tolerant receivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120A | Lower VBR range (133–147V vs. 133–163V); tighter 10% tolerance; same VWM, VC, and PPK. | Better suited for designs requiring tighter breakdown consistency across temperature and production lots. | Select SMBJ120A when statistical process control demands reduced VBR spread; SMBJ120C offers broader margin for variable surge thresholds. |
| SMCJ120C | Same VWM/VBR/VC specs but in larger DO-214AB (SMC) package; 1500W PPK rating; RθJA = 35°C/W. | Required where higher single-pulse energy (e.g., ISO 7637-2 Pulse 5a) or improved thermal management is needed. | Choose SMCJ120C only if board layout allows larger footprint and thermal design requires >600W capability; SMBJ120C optimizes space-constrained SMB layouts. |
Compared with SMBJ120A, SMBJ120C provides wider VBR tolerance for cost-sensitive applications where exact breakdown matching is less critical; versus SMCJ120C, it trades peak power headroom for compact DO-214AA mounting and higher component density.
Availability
SMBJ120C is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC input stages, LED driver overvoltage clamp, and telecom line interface protection requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for SMBJ120C 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 SMBJ series was developed specifically for high-reliability, surface-mount surge protection in automotive, industrial, and telecom systems where compact size, fast response, and ISO 7637-2 compliance are mandatory.
FAQ
What is the polarity configuration of SMBJ120C?
The SMBJ120C is a unidirectional TVS diode, with cathode indicated by a molded band on the DO-214AA package body. It conducts only in reverse bias during overvoltage events and blocks forward current up to 3.5V at 50A, per datasheet specification. This polarity must be observed during PCB layout to ensure correct clamping behavior in SMBJ120C applications.
Does SMBJ120C meet automotive transient immunity standards?
Yes, SMBJ120C meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), as confirmed in the official Taiwan Semiconductor datasheet revision R2104. Its 600W peak power rating and 214V clamping voltage enable direct compliance without supplemental components in SMBJ120C-based automotive designs.
What is the maximum clamping voltage of SMBJ120C under surge conditions?
The SMBJ120C has a maximum clamping voltage (VC) of 214V at 2.9A peak impulse current (IPP), tested with the standard 10/1000µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuits during transient events involving SMBJ120C.
Can SMBJ120C be used in bidirectional configurations?
No - SMBJ120C is unidirectional only. For bidirectional protection, Taiwan Semiconductor specifies the SMBJ120CA variant (with 'CA' suffix), which features symmetrical breakdown in both directions. Using SMBJ120C in reverse-biased AC applications will result in forward conduction and potential failure; always verify suffix and marking code before substitution in SMBJ120C designs.
What is the thermal resistance profile of SMBJ120C?
SMBJ120C has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case resistance (RθJC) of 10°C/W, measured in free-air conditions per JEDEC standards. These values inform thermal derating above 25°C ambient - for example, at 85°C TA, SMBJ120C's peak pulse power must be reduced to ~420W to maintain TJ ≤150°C.
SMBJ120C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 214V
- Current - Peak Pulse (10/1000µs):
- 2.9A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
SMBJ120C FAQ
1.How can I place an order for SMBJ120C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120C 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 SMBJ120C reliable?
The price and inventory of SMBJ120C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120C is usually 5 days.
3.What payment methods are accepted for SMBJ120C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120C?
SMBJ120C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120C 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 SMBJ120C?
For technical support, including SMBJ120C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120C requirements.
6.How does Aetrix verify that SMBJ120C is sourced from the original manufacturer or authorized distributors?
All SMBJ120C 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 SMBJ120C meets industry standards.
7.What is the process for return or replacement of SMBJ120C?
All SMBJ120C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120C, 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 SMBJ120C part is unused and in its original packaging.
Return procedure for SMBJ120C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120C Tags
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