My Inquiry
My Account
Taiwan Semiconductor Corporation SMCJ120C
- Part No.:
- SMCJ120C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120C.pdf
- Description:
- 1500W, 148V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:4,891
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ120C from Taiwan Semiconductor is a bidirectional 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 SMCJ120C datasheet, SMCJ120C pinout, SMCJ120C application, or SMCJ120C equivalent, key selection criteria include clamping performance under 10/1000μs surge, unidirectional vs. bidirectional configuration (C suffix = bidirectional), thermal derating above 25°C, and compliance with JESD201 Class 2 whisker resistance and UL 94V-0 molding compound.
Technical Context
The SMCJ120C implements a glass-passivated silicon junction optimized for fast response (<1.0 ps rise time from 0 V to VBR min) and low leakage (<1 μA at 120 V). Its bidirectional architecture enables symmetrical clamping in AC-coupled or floating signal lines without polarity constraints.
Designed for 1500 W peak pulse power (1 ms, 10/1000 μs waveform), it sustains 5 W steady-state dissipation at 25°C with RθJA = 55°C/W and RθJC = 10°C/W, supporting operation from –55°C to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 133 V / 163 V @ 1 mA - Confirmed breakdown range ensuring reliable turn-on margin above VWM |
| VC @ IPPM | 214 V @ 7.3 A - Clamped voltage during 10/1000 μs surge, limiting downstream stress |
| PPK | 1500 W - Peak pulse power handling per single 1 ms transient, per Fig.5 waveform |
| IR @ VWM | <1 μA - Negligible leakage at rated stand-off, preserving signal integrity in high-impedance circuits |
| Package | DO-214AB (SMC) - Surface-mount outline with 0.210 g mass, UL 94V-0 compliant molding |
| Polarity | Bidirectional - Cathode band omitted; symmetric clamping in both directions |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, polarity marked only for unidirectional variants; SMCJ120C has no cathode band due to bidirectional construction. Leads are solderable per J-STD-002, moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; voltage clamping occurs when |VAC| exceeds VBR in either direction |
| Case / Body | Thermal and mechanical interface | Non-electrical; provides heat sinking via PCB copper area per suggested pad layout |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated protection against automotive load-dump and inductive-switching transients (Pulse 1/2a/2b/3a/3b) |
| Fast response time | <1.0 ps from 0 V to VBR min ensures clamping before sensitive ICs experience overvoltage |
| Halogen-free construction | Meets IEC 61249-2-21, supporting RoHS-compliant and environmentally restricted designs |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth under thermal cycling, critical for long-life automotive modules |
| UL 94V-0 flammability rating | Molding compound self-extinguishes within 10 seconds after flame removal, enhancing system safety |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12 V/24 V battery rail in engine control units exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp absorbing >1500 W surges while maintaining <214 V across protected DC-DC converters and microcontrollers. Use Value: Prevents latch-up or gate oxide rupture in downstream MOSFET drivers and CAN transceivers during ISO 7637-2 Pulse 5a events. | Use Scenario: Analog input channels on programmable logic controllers interfacing with 4–20 mA sensors in factory-floor environments. IC Role / Device Role / Timing Role: Fast-clamping protection against EFT bursts (IEC 61000-4-4) and inductive kickback from solenoid actuation. Use Value: Maintains signal fidelity by limiting transient-induced offset errors and preventing ADC saturation or op-amp rail-to-rail clipping. |
| LED Driver Power Stage | Telecom Power Supply Input |
Use Scenario: High-brightness LED arrays in street lighting powered by switched-mode drivers with inductive energy storage. IC Role / Device Role / Timing Role: Bidirectional suppression of flyback spikes and lightning-induced surges on 48 V bus inputs. Use Value: Eliminates need for separate forward/reverse protection diodes, reducing BOM count and PCB footprint in space-constrained outdoor enclosures. | Use Scenario: -48 V DC input stage of telecom rectifier modules subjected to repeated lightning-induced surges per ITU-T K.20. IC Role / Device Role / Timing Role: Primary-level clamping device limiting surge energy entering bulk capacitors and PFC controllers. Use Value: Enables 1500 W single-pulse handling without thermal runaway, verified across –40°C to +85°C ambient per JEDEC JESD22-A108 thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CA | 600 W peak power rating, same VWM/VBR/VC but lower IPPM (3.6 A vs. 7.3 A), SMB package (smaller thermal mass) | Lower energy handling limits use in high-energy automotive load-dump scenarios; suitable for consumer-grade ESD protection | Select SMCJ120C when 1500 W surge immunity is required; SMBJ120CA fits tighter board spaces where 600 W suffices |
| 1.5KE120CA | Through-hole DO-201 package, identical 1500 W rating and 120 V VWM, but slower response (>1 ns) and higher IR (5 μA) | Not suitable for automated SMT assembly; requires wave-solder or hand-solder; less effective against sub-nanosecond EFT | Choose SMCJ120C for reflow-compatible, high-speed, surface-mount designs; 1.5KE120CA only where through-hole mounting is mandated |
Compared with SMBJ120CA and 1.5KE120CA, the SMCJ120C delivers superior surge robustness in SMT form factor with faster response and lower leakage-critical for automotive and industrial systems requiring repeatable 1500 W transient immunity without layout redesign.
Availability
SMCJ120C is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, LED driver power stages, and telecom power supply input circuits requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMCJ120C 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, and power devices since 1979.
The SMCJ series was engineered specifically for high-energy transient suppression in automotive and industrial environments, emphasizing rugged packaging, ISO-standard validation, and consistent parametric performance across temperature and lifetime.
FAQ
What does the "C" suffix indicate in SMCJ120C?
The "C" suffix in SMCJ120C denotes a bidirectional configuration, meaning the device clamps symmetrically for voltage excursions in either polarity. Unlike unidirectional SMCJ120A (which has a cathode band), SMCJ120C lacks polarity marking and functions identically across both terminals-ideal for AC lines, differential buses, or floating grounds where polarity reversal may occur. This is confirmed in the datasheet's "Devices for bipolar applications" section.
What is the maximum clamping voltage of SMCJ120C under standard test conditions?
The maximum clamping voltage (VC) of SMCJ120C is 214 V, measured at a peak pulse current (IPPM) of 7.3 A using the 10/1000 μs waveform defined in Fig.5. This value is guaranteed across the full operating temperature range (–55°C to +150°C) and represents the upper limit of voltage imposed on protected circuitry during a standardized surge event, directly enabling safe design margins for 150 V-rated components.
Does SMCJ120C meet automotive transient immunity standards?
Yes, SMCJ120C meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), as explicitly stated in the FEATURES section. Its 1500 W peak power rating, fast <1.0 ps response, and validated clamping behavior under these waveforms make it suitable for ECUs, body control modules, and infotainment power supplies where compliance with OEM-level EMC specifications is mandatory.
How does the DO-214AB (SMC) package of SMCJ120C compare thermally to smaller packages like SMB?
The DO-214AB (SMC) package of SMCJ120C provides significantly better thermal performance than SMB: its RθJA is 55°C/W versus ~80°C/W for SMB, and RθJC is 10°C/W versus ~15°C/W. This allows SMCJ120C to sustain full 1500 W surge capability with less junction temperature rise, critical for repeated transient events in enclosed automotive or industrial enclosures where airflow is limited.
Is SMCJ120C halogen-free and RoHS compliant?
Yes, SMCJ120C is both RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the FEATURES list. The molding compound contains no brominated flame retardants or chlorine-based additives, and all plating (matte tin) and substrate materials meet EU Directive 2011/65/EU requirements-ensuring compatibility with lead-free reflow profiles and environmental compliance for global market deployment.
SMCJ120C 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:
- -
- Bidirectional Channels:
- 1
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ120C FAQ
1.How can I place an order for SMCJ120C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120C 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 SMCJ120C reliable?
The price and inventory of SMCJ120C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120C is usually 5 days.
3.What payment methods are accepted for SMCJ120C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120C?
SMCJ120C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120C 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 SMCJ120C?
For technical support, including SMCJ120C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120C requirements.
6.How does Aetrix verify that SMCJ120C is sourced from the original manufacturer or authorized distributors?
All SMCJ120C 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 SMCJ120C meets industry standards.
7.What is the process for return or replacement of SMCJ120C?
All SMCJ120C units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120C, 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 SMCJ120C part is unused and in its original packaging.
Return procedure for SMCJ120C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120C Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
