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Taiwan Semiconductor Corporation SMAJ24C
- Part No.:
- SMAJ24C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24C.pdf
- Description:
- 400W, 29.7V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,303
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Product details
Overview
SMAJ24C from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 24V working stand-off voltage (VWM), 26.7–32.6V breakdown voltage (VBR) at 1mA test current, and 43.0V maximum clamping voltage (VC) at 9.3A peak pulse current. It protects DC/DC converters and SMPS inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ24C datasheet, SMAJ24C pinout, SMAJ24C application, or SMAJ24C equivalent, key selection criteria include clamping performance under 10/1000μs waveform, junction temperature range (−55°C to +150°C), moisture sensitivity level (J-STD-020 Level 1), and RoHS/halogen-free compliance for automotive and industrial power systems.
Technical Context
The SMAJ24C operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown and low leakage (<1μA at VWM). Its fast response time (<1.0ps from 0V to VBR min) enables suppression of ESD and load-dump transients before sensitive downstream circuitry is damaged.
Designed for surface-mount automation, it meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements. The DO-214AC package supports 40A peak forward surge current (IFSM) and dissipates 1W steady-state power, with thermal derating above 25°C per published curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 26.7 V / 32.6 V @ 1 mA - Ensures reliable avalanche initiation within defined tolerance band |
| VC @ IPPM | 43.0 V @ 9.3 A - Clamping voltage during 10/1000μs transient limits stress on protected ICs |
| PPPM | 400 W - Peak pulse power handling capability for automotive load-dump immunity |
| TJ operating range | −55°C to +150°C - Enables deployment in under-hood and industrial ambient environments |
| IR @ VWM | <1 μA - Negligible leakage ensures minimal standby power loss in battery-backed systems |
| Package | DO-214AC (SMA) - Standardized SMT footprint compatible with automated placement and reflow |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability; polarity indicated by molded cathode band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage rail; defines clamping path for positive transients |
| Cathode | High-side transient input | Connected to protected line (e.g., 24V rail); conducts during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Stable VBR tolerance and long-term reliability under thermal cycling and humidity |
| Fast response time <1.0 ps | Clamps transients before propagation into downstream regulators or controllers |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated protection for 12V/24V automotive power networks |
| J-STD-020 Level 1 moisture sensitivity | Zero bake requirement prior to reflow; simplifies manufacturing flow |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU directives for green electronics manufacturing |
Applications
| Automotive Power Distribution | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protection of 24V supply lines in vehicle body control modules against load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input rails to clamp transients to ≤43.0V. Use Value: Prevents damage to upstream PMICs and microcontrollers during ISO 7637-2 Pulse 5a (load dump) events up to 400W. | Use Scenario: Input surge protection for isolated 24V-to-5V DC/DC converters in factory automation PLCs. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive switching noise and lightning-induced spikes. Use Value: Maintains system uptime by limiting rail collapse during 10/1000μs transients without degrading efficiency. |
| Switching Mode Power Supply (SMPS) | LED Driver Power Input |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters powering IoT gateways. IC Role / Device Role / Timing Role: Fast-clamping device shunting energy away from output rectifiers and feedback optocouplers. Use Value: Reduces failure rate in field-deployed units exposed to mains-borne surges per IEC 61000-4-5. | Use Scenario: Input protection for constant-current LED drivers in street lighting systems. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SMAJ24C provides unidirectional clamping on 24V bus. Use Value: Extends driver lifetime by preventing MOSFET gate oxide rupture during inductive turn-off spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Narrower VBR range (26.7–29.5V); lower VC = 38.9V @ 10.3A | Better clamping margin for low-voltage tolerant loads; same DO-214AC package | Select SMAJ24A when tighter VBR tolerance and lower clamping voltage are required for sensitive 3.3V/5V logic rails downstream |
| P6SMB24C | Same VWM (24V), but higher VC = 38.9V @ 10.3A; 600W rating (10/1000μs) | Higher peak power handling; different package (DO-214AA/SMB) with larger thermal mass | Choose P6SMB24C only if board layout allows SMB footprint and higher 600W surge margin is needed |
Compared with SMAJ24A and P6SMB24C, the SMAJ24C offers balanced clamping performance (43.0V) and industry-standard DO-214AC compatibility, making it optimal for space-constrained 24V automotive and industrial PCBs where consistent manufacturability and J-STD-020 Level 1 handling are critical.
Availability
SMAJ24C is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC/DC converter input protection, and switching mode power supply (SMPS) applications requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMAJ24C 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 SMAJ series is part of TSC's transient voltage suppression portfolio, engineered specifically for robust, high-reliability protection of 12V/24V/48V power rails against ISO 7637-2 and IEC 61000-4-5 threats in harsh environments.
FAQ
What is the clamping voltage of SMAJ24C under standard 10/1000μs surge conditions?
The SMAJ24C has a maximum clamping voltage (VC) of 43.0 V at 9.3 A peak pulse current under the standardized 10/1000μs waveform. This value is measured per Figure 5 in the official Taiwan Semiconductor datasheet (U2102) and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMAJ24C unidirectional or bidirectional, and how is polarity identified?
SMAJ24C is a unidirectional TVS diode. Polarity is marked by a cathode band on the DO-214AC package body - the banded end connects to the protected line (e.g., 24V rail), while the anode connects to ground. Bidirectional variants use the "CA" suffix (e.g., SMAJ24CA), which SMAJ24C does not carry.
What is the maximum operating junction temperature for SMAJ24C, and how does it affect derating?
The SMAJ24C has a maximum junction temperature (TJ) of +150°C and a minimum of −55°C. Its peak pulse power must be derated linearly above TA = 25°C per Figure 2 in the datasheet - for example, at 85°C ambient, usable PPPM drops to approximately 260W, ensuring safe operation without thermal runaway.
Does SMAJ24C meet automotive qualification standards such as AEC-Q200?
SMAJ24C is not AEC-Q200 qualified. While it complies with ISO 7637-2 Pulse 1/2a/2b/3a/3b for transient immunity, Taiwan Semiconductor does not list AEC-Q200 stress testing (e.g., temperature cycling, humidity bias) in its official documentation for this part. For AEC-Q200–compliant alternatives, consult TSC's AEC-qualified TVS portfolio.
What packaging and reel quantity is offered for SMAJ24C?
SMAJ24C is supplied in DO-214AC (SMA) package on tape-and-reel format, with 7,500 units per reel. This configuration supports high-speed pick-and-place assembly and conforms to EIA-481 standards for automated manufacturing.
SMAJ24C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 43V
- Current - Peak Pulse (10/1000µs):
- 9.3A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ24C FAQ
1.How can I place an order for SMAJ24C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24C 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 SMAJ24C reliable?
The price and inventory of SMAJ24C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24C is usually 5 days.
3.What payment methods are accepted for SMAJ24C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24C?
SMAJ24C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24C 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 SMAJ24C?
For technical support, including SMAJ24C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24C requirements.
6.How does Aetrix verify that SMAJ24C is sourced from the original manufacturer or authorized distributors?
All SMAJ24C 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 SMAJ24C meets industry standards.
7.What is the process for return or replacement of SMAJ24C?
All SMAJ24C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24C, 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 SMAJ24C part is unused and in its original packaging.
Return procedure for SMAJ24C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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