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Taiwan Semiconductor Corporation SMCJ24
- Part No.:
- SMCJ24
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ24.pdf
- Description:
- 1500W, 29.7V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
SMCJ24 from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 24V working stand-off voltage (VWM), 26.7–32.6V breakdown voltage (VBR), and 43.0V maximum clamping voltage (VC) at 36A peak impulse current - designed for automotive load-dump and inductive switching protection in power supply rails.
For engineers reviewing the SMCJ24 datasheet, SMCJ24 pinout, SMCJ24 application, or SMCJ24 equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature limits up to +150°C, moisture sensitivity level 1 compliance, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMCJ24 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (26.7–32.6V @ 1mA), clamping transients to ≤43.0V at 36A (10/1000μs waveform). Its glass-passivated junction ensures stable breakdown and low leakage (<1μA @ 24V).
Thermal design relies on RθJA = 55°C/W and RθJC = 10°C/W, supporting continuous operation from –55°C to +150°C. It meets JESD201 Class 2 whisker resistance and UL 94V-0 molding compound requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum DC or continuous reverse operating voltage before conduction begins |
| VBR min/max | 26.7 V / 32.6 V @ 1 mA - Confirmed avalanche onset range defining turn-on threshold tolerance |
| VC @ IPPM | 43.0 V @ 36 A - Clamped voltage during 10/1000μs surge, limiting downstream IC stress |
| PPK | 1500 W - Peak pulse power handling per single non-repetitive 1ms event |
| IR @ VWM | <1 μA - Negligible leakage current at rated stand-off, preserving low-power circuit integrity |
| TJ max | +150 °C - Maximum junction temperature enabling use in under-hood automotive environments |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with cathode band marking and 0.210g mass |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, cathode band indicating terminal polarity; compliant with J-STD-002 solderability and J-STD-020 moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to system ground or lower-potential rail in unidirectional configuration |
| Cathode | Reverse-biased clamping node | Connected to protected line (e.g., 24V supply rail); cathode band marks this terminal on package |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Fast response time | <1.0 ps from 0 V to VBR min - enables suppression before sensitive logic or analog circuits are damaged |
| Glass passivated junction | Stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained designs |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 24V battery-fed control modules exposed to load-dump events (up to 40V, 100ms) and alternator ripple in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24V rail and chassis ground to clamp surges before they reach PMICs and microcontrollers. Use Value: Limits transient voltage to ≤43.0V during 36A 10/1000μs pulses, preventing latch-up or gate oxide damage in downstream 3.3V/5V logic. | Use Scenario: Digital input channels of programmable logic controllers receiving 24V dry-contact signals in factory automation. IC Role / Device Role / Timing Role: Front-end protection device absorbing EFT bursts (IEC 61000-4-4) and inductive kickback from relay coils. Use Value: Withstands ≥1000 surges at rated PPK without parameter shift, ensuring field reliability over 10+ year deployments. |
| LED Driver Overvoltage Clamp | Telecom Power Interface |
Use Scenario: Constant-current LED drivers powered from 24V DC supplies subject to hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Parallel-connected TVS across input terminals to shunt fast-rising transients (<1ns rise time) before driver ICs. Use Value: Sub-1ps response ensures clamping initiates prior to internal FET avalanche, avoiding destructive failure modes. | Use Scenario: 24V auxiliary power interface in telecom base station remote radio units exposed to lightning-induced surges. IC Role / Device Role / Timing Role: First-stage protection device upstream of DC-DC converters and monitoring ICs. Use Value: 1500W peak power rating supports multi-event surge immunity per GR-1089-CORE Section 4.5.2.2.1 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | 600W PPK rating, SMB package (smaller footprint), 38.9V VC @ 22A | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 or sustained load-dump events | Select SMCJ24 when 1500W surge capability and DO-214AB thermal mass are required |
| 1.5KE24A | Through-hole TO-204AA (DO-41), 1500W, 38.7V VC @ 38.8A, slower thermal response | Requires wave soldering or hand assembly; incompatible with high-density SMT lines | Choose SMCJ24 for automated placement, moisture sensitivity level 1, and surface-mount scalability |
Compared with SMBJ24A and 1.5KE24A, the SMCJ24 delivers identical clamping voltage performance at higher surge current capacity in a moisture-insensitive, auto-placed package - making it optimal for automotive and industrial SMT production where reliability, repeatability, and thermal robustness are critical.
Availability
SMCJ24 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input stages, LED driver overvoltage clamp, and telecom power interface applications requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMCJ24 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 industrial and automotive markets.
The SMCJ series was developed specifically for high-energy transient suppression in 12V/24V vehicle electrical systems and ruggedized industrial controls, emphasizing ISO 7637-2 compliance and SMT manufacturability.
FAQ
What is the maximum clamping voltage of the SMCJ24 under standard test conditions?
The SMCJ24 has a maximum clamping voltage (VC) of 43.0 V when subjected to a 10/1000 μs waveform peak impulse current (IPPM) of 36 A. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ24 maintains this clamping performance consistently across its qualified operating temperature range.
Is the SMCJ24 suitable for bidirectional transient protection?
No, the SMCJ24 is a unidirectional TVS diode intended for DC line protection with defined polarity. For bidirectional applications, Taiwan Semiconductor specifies the SMCJ24CA variant (with CA suffix), which provides symmetrical clamping in both directions. Using the unidirectional SMCJ24 in AC or bipolar signal paths may result in forward conduction and failure.
What is the marking code for the SMCJ24 according to the datasheet?
The official marking code for the SMCJ24 is GEY, as specified in the Electrical Specifications table. This two-character code appears on the device body adjacent to the cathode band and is used for visual identification and traceability during assembly and inspection. The "G" prefix indicates green compound, and "EY" uniquely identifies the 24V stand-off variant within the SMCJ family.
Does the SMCJ24 meet automotive qualification standards beyond ISO 7637-2?
The SMCJ24 is explicitly validated for ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms but is not AEC-Q200 qualified. It meets JESD201 Class 2 whisker resistance and J-STD-020 moisture sensitivity level 1, supporting reflow compatibility. For AEC-Q200-compliant designs, engineers should verify additional qualification testing with Taiwan Semiconductor or select an AEC-Q200-certified variant.
What is the thermal resistance from junction to ambient (RθJA) for the SMCJ24 in standard mounting conditions?
The junction-to-ambient thermal resistance (RθJA) for the SMCJ24 is 55°C/W under standard JEDEC High-K board conditions (two-layer board, 1 in² copper pad per terminal). This value assumes proper PCB layout per the recommended pad dimensions in the datasheet and is critical for calculating worst-case junction temperature during repetitive surge events or elevated ambient conditions.
SMCJ24 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 43V
- Current - Peak Pulse (10/1000µs):
- 36A
- 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)
SMCJ24 FAQ
1.How can I place an order for SMCJ24 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ24 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 SMCJ24 reliable?
The price and inventory of SMCJ24 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ24 is usually 5 days.
3.What payment methods are accepted for SMCJ24?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ24 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ24?
SMCJ24 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ24 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 SMCJ24?
For technical support, including SMCJ24 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ24 requirements.
6.How does Aetrix verify that SMCJ24 is sourced from the original manufacturer or authorized distributors?
All SMCJ24 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 SMCJ24 meets industry standards.
7.What is the process for return or replacement of SMCJ24?
All SMCJ24 units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ24, 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 SMCJ24 part is unused and in its original packaging.
Return procedure for SMCJ24:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ24 Tags
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