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Taiwan Semiconductor Corporation SMCJ24A
- Part No.:
- SMCJ24A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ24A.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:8,253
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Product details
Overview
SMCJ24A 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), 26.7–29.5V breakdown voltage (VBR), and 38.9V maximum clamping voltage (VC) at 40A peak pulse current - designed for automotive load-dump and inductive switching protection in power supply rails.
For engineers reviewing the SMCJ24A datasheet, SMCJ24A pinout, SMCJ24A application, or SMCJ24A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature derating above 25°C, moisture sensitivity level (MSL 1), and compatibility with automated SMT placement on 12V/24V vehicle subsystems.
Technical Context
The SMCJ24A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (26.7–29.5V @ 1mA), clamping transients to ≤38.9V at 40A (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 up to TJ = 150°C. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for high-reliability PCB mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum DC or RMS voltage the device blocks continuously without conduction |
| VBR min/max | 26.7 V / 29.5 V @ 1 mA - Ensures reliable turn-on before system overvoltage damage occurs |
| VC @ IPPM | 38.9 V @ 40 A - Clamped voltage during 10/1000μs surge; defines worst-case stress on downstream ICs |
| PPK | 1500 W - Peak pulse power handling per single non-repetitive transient (per Fig.5) |
| IR @ VWM | <1 μA - Negligible leakage current preserves standby power integrity in battery-backed systems |
| TJ max | +150 °C - Enables use in under-hood automotive environments with minimal thermal margin loss |
| Package | DO-214AB (SMC) - Standardized SMT footprint compatible with IPC-7351B land pattern |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads; cathode indicated by band; polarity-critical for unidirectional operation; MSL Level 1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path; defines clamping reference point |
| Cathode | Protected line input | Connected to 24V rail or signal line; conducts avalanche current during overvoltage events |
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 (ESD/coupled noise) |
| Fast response time | <1.0 ps - Sub-picosecond junction response ensures clamping before sensitive logic thresholds are exceeded |
| 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 green manufacturing |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 24V battery-fed ECU power input subjected to load-dump spikes up to 40V per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC-DC converter input. Use Value: Limits transient voltage to 38.9V, protecting 40V-rated input capacitors and controller ICs without derating. | Use Scenario: Digital output module driving 24V solenoids with inductive kickback exceeding 100V. IC Role / Device Role / Timing Role: Snubber element across relay coil or MOSFET drain-source. Use Value: Absorbs 1500W peak energy within 1ms, preventing latch-up or gate oxide rupture in driver ICs. |
| LED Driver Overvoltage Clamp | Telecom Line Card Surge Suppression |
Use Scenario: Constant-current LED string powered from 24V supply exposed to EFT bursts per IEC 61000-4-4. IC Role / Device Role / Timing Role: Parallel-connected TVS at driver IC output stage. Use Value: Clamps fast transients to 38.9V, preserving LED forward voltage margin and avoiding current-sense amplifier saturation. | Use Scenario: 24V auxiliary power rail in telecom shelf management unit experiencing lightning-induced surges. IC Role / Device Role / Timing Role: First-stage protection before LDO regulator and monitoring circuitry. Use Value: Withstands 40A peak impulse (10/1000μs), reducing downstream filter component stress and enabling smaller PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | 600W rating, same VWM/VBR/VC but lower IPPM (22A vs 40A), SMB package (smaller footprint, higher RθJA) | Lower energy handling limits use to sub-600W surge environments; unsuitable for full ISO 7637-2 Pulse 5a | Select only if board space is constrained and peak surge energy remains below 600W |
| 1.5KE24A | Through-hole DO-201 package, identical electrical specs but slower thermal recovery and no MSL rating | Not suitable for automated SMT lines; requires wave soldering and lacks moisture sensitivity control | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMBJ24A and 1.5KE24A, the SMCJ24A delivers higher surge robustness (1500W vs 600W/1500W), SMT manufacturability, and MSL-1 reliability - making it optimal for volume automotive and industrial PCBs requiring zero rework risk and full ISO 7637-2 compliance.
Availability
SMCJ24A is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, LED driver power stages, and telecom line card protection requiring stable component supply across multi-year production cycles.
Supply support for SMCJ24A 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, serving global automotive, industrial, and consumer markets since 1979.
The SMCJ series is part of TSC's high-power TVS portfolio engineered specifically for ISO 7637-2-compliant transient suppression in 12V/24V vehicle networks and ruggedized industrial power interfaces.
FAQ
What is the clamping voltage of the SMCJ24A under standard test conditions?
The SMCJ24A has a maximum clamping voltage (VC) of 38.9 V at 40 A peak pulse current (IPPM), tested with a 10/1000 μs waveform per IEC 61000-4-5 and ANSI/IEEE C62.35. This value defines the upper voltage limit imposed on protected circuits during surge events and is measured after the device enters avalanche conduction.
Is the SMCJ24A suitable for bidirectional transient protection?
No, the SMCJ24A is a unidirectional TVS diode intended for DC power line protection with defined polarity. For bidirectional applications such as AC signal lines or data buses, the SMCJ24CA variant must be used - it features symmetrical breakdown in both directions and carries a 'CA' suffix per TSC's ordering nomenclature.
What is the maximum operating junction temperature for the SMCJ24A?
The SMCJ24A supports a maximum junction temperature (TJ) of +150°C, validated per absolute maximum ratings in the official TSC datasheet (Version S2104). Derating of peak power begins above TA = 25°C per Figure 2, with RθJA = 55°C/W defining thermal resistance to ambient under standard JEDEC test conditions.
Does the SMCJ24A meet automotive qualification standards?
Yes, the SMCJ24A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for electrical disturbances in road vehicles. While not AEC-Q101 qualified as a standalone component, its electrical behavior, thermal performance, and construction (glass-passivated junction, MSL 1, JESD201 Class 2) align with automotive-grade design practices for non-safety-critical power rail protection.
What is the marking code for the SMCJ24A on the device body?
The SMCJ24A is marked with the code 'GEZ' on its DO-214AB (SMC) package body, followed by green compound (G), date code (YW), and factory code (F). The cathode band identifies the cathode terminal and must be oriented toward the protected line during PCB layout.
SMCJ24A 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:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 38.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ24A FAQ
1.How can I place an order for SMCJ24A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ24A 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 SMCJ24A reliable?
The price and inventory of SMCJ24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ24A is usually 5 days.
3.What payment methods are accepted for SMCJ24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ24A?
SMCJ24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ24A 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 SMCJ24A?
For technical support, including SMCJ24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ24A requirements.
6.How does Aetrix verify that SMCJ24A is sourced from the original manufacturer or authorized distributors?
All SMCJ24A 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 SMCJ24A meets industry standards.
7.What is the process for return or replacement of SMCJ24A?
All SMCJ24A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ24A, 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 SMCJ24A part is unused and in its original packaging.
Return procedure for SMCJ24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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