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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Taiwan Semiconductor Corporation SMCJ150

Name: SMCJ150
Brand: Taiwan Semiconductor Corporation
SKU: SMCJ150
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMCJ150

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-214AB, SMC

Datasheet:: SMCJ150.pdf

Description:: 1500W, 185.5V, 10%, UNIDIRECTION

Quantity:: RFQ Add To RFQ list

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Inventory:3,000

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Product details

Overview

SMCJ150 from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 150V working stand-off voltage (VWM), 167–204V breakdown voltage (VBR), and 266V maximum clamping voltage (VC) at 5.8A peak impulse current - designed for automotive load-dump and inductive switching protection in power supply rails.

For engineers reviewing the SMCJ150 datasheet, SMCJ150 pinout, SMCJ150 application, or SMCJ150 equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 2b/5a, thermal resistance (R_θJA = 55°C/W), junction temperature range (–55°C to +150°C), and unidirectional polarity marking for correct PCB orientation.

Technical Context

The SMCJ150 operates as a silicon avalanche diode optimized for fast transient suppression: it achieves sub-1ps response from 0V to V_BR(min), delivers 1500W peak pulse power (t_p = 1ms), and maintains <1μA reverse leakage at 150V - meeting ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity requirements for automotive electronics.

Its unidirectional configuration uses a cathode band for polarity identification, supports 200A non-repetitive forward surge (8.3ms half-sine), and features glass-passivated junctions with UL 94V-0 molding compound - enabling automated placement and JESD201 Class 2 whisker resistance in harsh environments.

Key Specifications

Parameter	Value and Actual Design Meaning
VWM	150 V - maximum continuous reverse operating voltage before clamping begins
VBR min/max	167 V / 204 V @ IT = 1 mA - guaranteed avalanche initiation window for predictable turn-on
VC @ IPPM	266 V @ 5.8 A - clamped voltage during 10/1000μs surge, limiting downstream stress
PPK	1500 W - peak pulse power handling per single 1ms transient per Fig.5 waveform
R_θJA	55 °C/W - junction-to-ambient thermal resistance, defining derating above 25°C ambient
TJ max	+150 °C - maximum allowable junction temperature for reliable long-term operation
IR @ VWM	≤1 μA - negligible leakage at rated stand-off, minimizing standby power loss

Pinout & Package

Package: DO-214AB (SMC), surface-mount, molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Low-side connection	Connected to ground or low-voltage rail; forms current path during reverse-biased clamping
Cathode	High-side connection	Connected to protected line (e.g., 12V/24V rail); marked with band for orientation verification

Key Features

Feature	Design Value
ISO 7637-2 compliance	Validated for Pulse 1 (inductive flyback), Pulse 2a/2b (load dump), and Pulse 3a/3b (switching transients) in automotive ECUs
Glass-passivated junction	Enhances reliability under humidity and thermal cycling vs. epoxy-passivated alternatives
Fast response time	Typically <1.0 ps from 0 V to V_BR(min), ensuring clamping activation before IC damage thresholds are exceeded
Moisture sensitivity level	MSL Level 1 (per J-STD-020), allowing unlimited floor life without dry-pack requirements
Halogen-free construction	Complies with IEC 61249-2-21, supporting RoHS-compliant and environmentally regulated end products

Applications

Automotive Power Rail Protection	Industrial Motor Drive Inputs
Use Scenario: Protecting 24V CAN bus power lines against load-dump transients up to 35V for >400ms duration in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input, clamping surges before they reach regulator ICs. Use Value: Limits peak voltage to ≤266V during ISO 7637-2 Pulse 5a, preventing overvoltage failure of 36V-rated input stages.	Use Scenario: Safeguarding PLC analog input modules from inductive kickback when solenoid valves de-energize. IC Role / Device Role / Timing Role: Mounted across 24V supply pins of signal conditioning ASICs to absorb energy from L·di/dt events. Use Value: Clamps transients within 1ps, holding voltage below 266V at 5.8A - well under absolute maximum ratings of precision op-amps and ADCs.
LED Driver Supply Protection	Telecom Power Interface
Use Scenario: Shielding constant-current LED drivers in streetlight systems from lightning-induced surges on AC/DC front-end rails. IC Role / Device Role / Timing Role: Placed after bridge rectifier but before bulk capacitor to clamp differential-mode transients on 350V DC bus. Use Value: Withstands 1500W pulses and maintains <1μA leakage at 150V, preserving efficiency while enabling Class III surge rating.	Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras) from EFT bursts on 48V DC input derived from midspan injectors. IC Role / Device Role / Timing Role: Used as secondary-level TVS on powered device side, coordinated with primary-side GDTs for staged suppression. Use Value: Delivers 266V clamping at 5.8A with R_θJA = 55°C/W, enabling compact layout without forced airflow in sealed enclosures.

Automotive Power Rail Protection

Industrial Motor Drive Inputs

Use Scenario: Protecting 24V CAN bus power lines against load-dump transients up to 35V for >400ms duration in commercial vehicles.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input, clamping surges before they reach regulator ICs.

Use Value: Limits peak voltage to ≤266V during ISO 7637-2 Pulse 5a, preventing overvoltage failure of 36V-rated input stages.

Use Scenario: Safeguarding PLC analog input modules from inductive kickback when solenoid valves de-energize.

IC Role / Device Role / Timing Role: Mounted across 24V supply pins of signal conditioning ASICs to absorb energy from L·di/dt events.

Use Value: Clamps transients within 1ps, holding voltage below 266V at 5.8A - well under absolute maximum ratings of precision op-amps and ADCs.

LED Driver Supply Protection

Telecom Power Interface

Use Scenario: Shielding constant-current LED drivers in streetlight systems from lightning-induced surges on AC/DC front-end rails.

IC Role / Device Role / Timing Role: Placed after bridge rectifier but before bulk capacitor to clamp differential-mode transients on 350V DC bus.

Use Value: Withstands 1500W pulses and maintains <1μA leakage at 150V, preserving efficiency while enabling Class III surge rating.

Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras) from EFT bursts on 48V DC input derived from midspan injectors.

IC Role / Device Role / Timing Role: Used as secondary-level TVS on powered device side, coordinated with primary-side GDTs for staged suppression.

Use Value: Delivers 266V clamping at 5.8A with R_θJA = 55°C/W, enabling compact layout without forced airflow in sealed enclosures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ150A	600W rating, SMB package (smaller footprint), lower IPPM (3.2A), higher VC (274V)	Lower power handling limits use to sub-100W systems; not suitable for ISO 7637-2 Pulse 5a	Select only if space-constrained and peak surge energy is ≤600W
1.5KE150A	Through-hole TO-204AA (DO-41), same 150V VWM, but slower response (>1ns), higher R_θJA (~65°C/W)	Requires manual assembly; unsuitable for high-density automotive PCBs requiring automated placement	Choose only for legacy through-hole designs where rework tolerance outweighs performance trade-offs

Compared with SMBJ150A and 1.5KE150A, the SMCJ150 provides 2.5× higher peak power (1500W), DO-214AB surface-mount compatibility for automotive-grade reflow, and verified ISO 7637-2 Pulse 2b/5a compliance - making it the preferred choice for new 24V/48V embedded power rail designs requiring robust, automated, and standards-aligned transient protection.

Availability

SMCJ150 is available at Aetrix Electronics and suitable for automotive ECU power rails, industrial motor drive inputs, LED driver supplies, and telecom PoE interfaces requiring stable component supply across extended temperature and surge conditions.

Supply support for SMCJ150 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 consumer markets.

The SMCJ series was developed specifically for high-energy transient suppression in automotive and industrial power systems, emphasizing ISO 7637-2 compliance, automated assembly readiness, and extended junction temperature capability.

FAQ

What is the maximum clamping voltage of the SMCJ150 under standard test conditions?

The SMCJ150 has a maximum clamping voltage (V_C) of 266 V at 5.8 A peak impulse current (I_PPM) using the 10/1000 μs double-exponential surge waveform defined in Fig.5 of the datasheet. This value ensures downstream components see limited overvoltage during standardized transients such as ISO 7637-2 Pulse 2b, and is measured with T_A = 25°C and proper PCB thermal relief.

Is the SMCJ150 unidirectional or bidirectional, and how is polarity identified?

The SMCJ150 is a unidirectional TVS diode, intended for DC rail protection where polarity is fixed. Polarity is identified by a cathode band printed on the DO-214AB (SMC) package body - the banded end connects to the protected line (e.g., 24V rail), while the unbanded end connects to ground. Bidirectional variants use "C" or "CA" suffixes (e.g., SMCJ150C).

Does the SMCJ150 meet automotive transient immunity standards?

Yes, the SMCJ150 meets ISO 7637-2 requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection/load dump), and Pulse 3a/3b (capacitive coupling/switching noise). Its 1500W peak power rating, fast <1ps response, and specified clamping behavior under defined waveforms make it suitable for AEC-Q101-informed automotive subsystem designs.

What is the thermal resistance and maximum junction temperature of the SMCJ150?

The SMCJ150 has a junction-to-ambient thermal resistance (R_θJA) of 55°C/W and a maximum junction temperature (T_J(max)) of +150°C. These values assume standard JEDEC 2-layer PCB mounting with recommended pad layout per datasheet Fig.7; derating is required above 25°C ambient per Fig.2, and R_θJC = 10°C/W enables heatsink evaluation if needed.

Can the SMCJ150 be used in place of the SMCJ150A?

No - the SMCJ150 and SMCJ150A are distinct variants: SMCJ150 has V_BR = 167–204 V and V_C = 266 V, while SMCJ150A has tighter V_BR = 167–185 V and lower V_C = 243 V. The "A" suffix denotes enhanced breakdown voltage tolerance and improved clamping consistency; substituting SMCJ150 for SMCJ150A may result in higher clamping voltage and reduced system margin under worst-case transients.

SMCJ150 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):: 150V

Voltage - Breakdown (Min):: 167V

Voltage - Clamping (Max) @ Ipp:: 266V

Current - Peak Pulse (10/1000µs):: 5.8A

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)

SMCJ150 FAQ

1.How can I place an order for SMCJ150 through Aetrix?

Please submit a Request for Quotation (RFQ) for SMCJ150 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 SMCJ150 reliable?

The price and inventory of SMCJ150 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ150 is usually 5 days.

3.What payment methods are accepted for SMCJ150?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ150 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMCJ150?

SMCJ150 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMCJ150 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 SMCJ150?

For technical support, including SMCJ150 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ150 requirements.

6.How does Aetrix verify that SMCJ150 is sourced from the original manufacturer or authorized distributors?

All SMCJ150 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 SMCJ150 meets industry standards.

7.What is the process for return or replacement of SMCJ150?

All SMCJ150 units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ150, 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 SMCJ150 part is unused and in its original packaging.

Return procedure for SMCJ150:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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