My Inquiry
My Account
Taiwan Semiconductor Corporation SMCJ120A
- Part No.:
- SMCJ120A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120A.pdf
- Description:
- TVS DIODE 120VWM 193VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:21,146
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ120A 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 protects automotive power rails and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ120A datasheet, SMCJ120A pinout, SMCJ120A application, or SMCJ120A equivalent, this page delivers verified electrical specs, clamping performance under 10/1000μs surge, thermal resistance (RθJC = 10°C/W), moisture sensitivity level (MSL 1), and RoHS/halogen-free compliance - all critical for ESD and inductive switching protection design.
Technical Context
The SMCJ120A uses a glass-passivated silicon junction to achieve sub-1ps response time from 0 V to VBR(min), enabling effective suppression of fast-rising transients such as EFT and load dump spikes. Its unidirectional configuration supports DC-biased lines where reverse conduction must be blocked.
Rated for 1500W peak pulse power (tp = 1 ms), it operates across –55°C to +150°C junction temperature and features low leakage (<1 μA at 120V), making it suitable for high-reliability 24V/48V industrial control and automotive body electronics.
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 breakdown range ensuring reliable turn-on margin above VWM |
| VC @ IPPM | 193 V @ 8.1 A - Clamping voltage during 10/1000μs surge, limiting downstream voltage stress |
| PPK | 1500 W - Peak pulse power handling per single 1 ms transient, per Fig.5 waveform |
| RθJC | 10 °C/W - Junction-to-case thermal resistance enabling efficient heat transfer to PCB copper |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off, minimizing standby power loss in high-impedance circuits |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 0.210 g mass and J-STD-002 solderable matte tin leads |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with cathode band marking; polarity-sensitive unidirectional device; terminals are matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration |
| Cathode | Clamping terminal | Connected to protected line (e.g., 24V rail); conducts when transient exceeds VBR, shunting current to anode |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (EFT), enabling direct use in automotive ECUs without additional filtering |
| Sub-1 ps response time | Ensures clamping activation before transient energy couples into sensitive IC inputs, critical for CAN/LIN bus protection |
| MSL Level 1 rating | Permits unlimited floor life and standard reflow without baking, simplifying SMT manufacturing flow |
| UL 94V-0 molding compound | Provides flame-retardant encapsulation required for industrial safety certifications (IEC 62368-1, UL 62368) |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU, supporting green electronics compliance programs |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Suppressing load dump transients on 24V battery-fed ECUs in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground, clamping surges up to ±120V within nanoseconds. Use Value: Limits voltage seen by downstream DC-DC converters and microcontrollers to ≤193V, preventing latch-up or gate oxide damage. | Use Scenario: Protecting 24V digital input channels in programmable logic controllers exposed to relay coil flyback. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing 1500W inductive kickback pulses without degradation over >10,000 cycles. Use Value: Eliminates need for external snubbers or varistors, reducing BOM count while maintaining IEC 61000-4-4 Level 4 immunity. |
| LED Driver Surge Suppression | RS-485 Transceiver Line Protection |
Use Scenario: Safeguarding constant-current LED drivers in street lighting against lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: Primary clamping device on DC bus after bridge rectifier, triggered before MOVs reach thermal limit. Use Value: Provides precise 120V threshold and low clamping ratio (VC/VWM = 1.61), preserving driver MOSFET SOA during repeated 10/1000μs events. | Use Scenario: Shielding RS-485 transceivers in factory automation networks from ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SMCJ120A applied on isolated power rail (VCC) rather than data lines due to unidirectional nature. Use Value: Maintains <1 μA leakage at 120V, avoiding signal integrity impact on bias networks while delivering 1500W transient dissipation. |
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 | Same VWM/VBR/VC specs but 600W PPK rating and SMB package (smaller footprint, higher RθJA) | Lower power handling limits use to sub-600W surge environments; unsuitable for ISO 7637-2 Pulse 5a load dump | Select when board space is constrained and peak transients are limited to 600W (e.g., sensor nodes, low-power I/O) |
| 1.5KE120A | Through-hole DO-201 package, identical 120V VWM and 193V VC, but 1500W rating with slower response (~1 ns) and higher IR (5 μA) | Requires wave soldering or hand assembly; less compatible with automated SMT lines and high-density layouts | Choose only for legacy through-hole designs or where thermal mass of axial lead improves long-duration surge endurance |
Compared with SMBJ120A and 1.5KE120A, the SMCJ120A uniquely balances 1500W surge capacity, sub-1ps response, MSL 1 manufacturability, and DO-214AB thermal performance - making it optimal for new automotive and industrial SMT platforms requiring robust, production-ready TVS protection.
Availability
SMCJ120A is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O modules, LED driver power stages, and RS-485 infrastructure requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMCJ120A 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 since 1979.
The SMCJ series belongs to TSC's high-power surface-mount TVS platform engineered specifically for automotive-grade transient immunity and industrial equipment surge resilience, with emphasis on repeatable clamping performance and JEDEC-compliant packaging.
FAQ
What is the maximum clamping voltage of the SMCJ120A under standardized surge conditions?
The SMCJ120A exhibits a maximum clamping voltage (VC) of 193 V when subjected to its rated 8.1 A peak impulse current (IPPM) using the 10/1000 μs double-exponential waveform defined in Fig.5 of the datasheet. This value is measured at TA = 25°C and ensures downstream circuitry remains below critical overvoltage thresholds during transient events. The SMCJ120A maintains this clamping performance consistently across its qualified operating temperature range.
Is the SMCJ120A suitable for bidirectional transient protection applications?
No, the SMCJ120A is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical specifications - including VBR, VWM, and VC - apply only in the reverse direction; forward conduction follows standard diode behavior with VF ≈ 5.0 V at 100 A. For bidirectional protection, the SMCJ120CA variant (with "CA" suffix) must be selected, as confirmed in the Devices for bipolar applications section of the datasheet.
What is the thermal resistance from junction to ambient (RθJA) for the SMCJ120A in standard mounting conditions?
The SMCJ120A has a typical junction-to-ambient thermal resistance (RθJA) of 55°C/W under standard JEDEC test conditions (single device on 1-inch² FR-4 board with 2 oz copper). This value assumes no added copper pour or thermal vias; actual RθJA improves significantly with enhanced PCB layout - e.g., ≥20°C/W is achievable with 20 mm² thermal pad and six 0.3-mm vias - which directly extends safe operating time during repetitive surges.
Does the SMCJ120A meet automotive qualification standards such as AEC-Q101?
The SMCJ120A is not explicitly listed as AEC-Q101 qualified in the provided documentation. While it meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive transient immunity and operates across –55°C to +150°C, formal AEC-Q101 stress testing (including HTGB, HTRB, and accelerated life testing) is not cited. Designers requiring AEC-Q101 compliance should verify qualification status directly with Taiwan Semiconductor or select an AEC-Q101–certified variant such as the SMAJ120A-Q or SMF120A-Q series.
How does the SMCJ120A compare to the SMCJ120 in terms of clamping performance and leakage?
The SMCJ120A offers tighter breakdown voltage tolerance (133–147 V vs. 133–163 V for SMCJ120) and lower maximum clamping voltage (193 V vs. 214 V at same IPPM), resulting in superior voltage limiting during transients. It also maintains <1 μA reverse leakage at 120 V, matching the SMCJ120's specification. These improvements stem from tighter process control in the "A" variant, making the SMCJ120A preferable for designs demanding consistent clamping and minimal standby current.
SMCJ120A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- 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):
- 7.8A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ120A FAQ
1.How can I place an order for SMCJ120A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120A 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 SMCJ120A reliable?
The price and inventory of SMCJ120A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120A is usually 5 days.
3.What payment methods are accepted for SMCJ120A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120A?
SMCJ120A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120A 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 SMCJ120A?
For technical support, including SMCJ120A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120A requirements.
6.How does Aetrix verify that SMCJ120A is sourced from the original manufacturer or authorized distributors?
All SMCJ120A 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 SMCJ120A meets industry standards.
7.What is the process for return or replacement of SMCJ120A?
All SMCJ120A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120A, 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 SMCJ120A part is unused and in its original packaging.
Return procedure for SMCJ120A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120A 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…
