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Taiwan Semiconductor Corporation SMDJ24CAH
- Part No.:
- SMDJ24CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ24CAH.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
SMDJ24CAH from Taiwan Semiconductor is a bidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with a working stand-off voltage of 24 V, breakdown voltage range of 26.7–29.5 V at 1 mA, and maximum clamping voltage of 38.9 V at 77.1 A peak pulse current. It is AEC-Q101 qualified and designed for ESD and surge protection in automotive power-line and industrial control interfaces.
For engineers reviewing the SMDJ24CAH datasheet, SMDJ24CAH pinout, SMDJ24CAH application, or SMDJ24CAH equivalent, key selection criteria include bidirectional clamping performance, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, 1.0 ps response time, TJ = −55°C to +175°C operating range, and DO-214AB mechanical compatibility with automated SMT assembly.
Technical Context
The SMDJ24CAH implements a glass-passivated silicon junction optimized for fast transient suppression in bidirectional signal and power lines. Its design supports unidirectional and bidirectional configurations-CAH suffix denotes symmetrical bipolar operation with identical electrical characteristics in both polarities.
It delivers 3000 W peak pulse power (tp = 1 ms, 10/1000 µs waveform), clamps transients within 38.9 V at 77.1 A, and maintains low leakage (<1 µA at 24 V) while meeting JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 26.7 V / 29.5 V @ IT = 1 mA - Ensures reliable breakdown onset across process variation |
| VC @ IPPM | 38.9 V @ 77.1 A - Clamping voltage under 10/1000 µs surge defines protected circuit stress limit |
| PPK | 3000 W - Peak pulse power handling capability per single non-repetitive event |
| TJ max | +175 °C - Enables use in under-hood automotive and high-ambient industrial environments |
| RθJA | 75 °C/W - Thermal resistance informs PCB copper area and heatsinking requirements |
| Response time | <1.0 ps - Sub-picosecond junction response ensures protection before IC damage occurs |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional, cathode band not applicable (symmetrical construction). Weight: 0.290 g. Matte tin-plated leads, RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Either terminal serves as input/output; no polarity marking required for bidirectional operation |
| Case (body) | Thermal and mechanical interface | DO-214AB outline provides standardized SMT footprint and thermal mass for PCB heat dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive power electronics including engine control units and body modules |
| ISO 7637-2 compliance | Withstands load-dump, jump-start, and inductive switching transients per Pulse 1/2a/2b/3a/3b test profiles |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal cycling and humidity stress |
| J-STD-020 Level 1 rating | Enables standard reflow without pre-baking, reducing manufacturing cost and complexity |
| 1.0 ps response time | Protects high-speed interfaces (e.g., CAN FD, LIN) before transient energy couples into sensitive logic |
Applications
| Automotive Power Line Protection | Industrial I/O Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails in vehicle ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between power rail and ground to shunt surge energy away from downstream regulators and microcontrollers. Use Value: Withstands 3000 W surges per ISO 7637-2 Pulse 5a while maintaining clamping below 39 V, preserving 3.3 V/5 V logic integrity. | Use Scenario: Shielding analog and digital I/O ports on PLC modules from field-induced lightning surges and relay coil kickback. IC Role / Device Role / Timing Role: Primary overvoltage clamp on signal lines interfacing with sensors, actuators, and HMI panels. Use Value: Fast 1.0 ps response and symmetrical clamping ensure equal protection for positive/negative transients without polarity concerns. |
| Telecom DC Power Input Protection | Consumer Equipment Surge Immunity |
Use Scenario: Safeguarding PoE-powered devices (e.g., IP cameras, access points) connected to 24–48 V DC distribution lines. IC Role / Device Role / Timing Role: Front-end transient suppressor on DC input before DC-DC conversion stage. Use Value: 24 V VWM aligns with common telecom DC bus voltages; 38.9 V VC prevents overvoltage stress on primary-side FETs and controllers. | Use Scenario: Hardening USB-C PD adapters and smart home hubs against ESD and AC line-coupled surges. IC Role / Device Role / Timing Role: Secondary-level TVS on internal 24 V auxiliary rails feeding MCU, memory, and communication ICs. Use Value: AEC-Q101 qualification and halogen-free construction support global safety certifications (UL, IEC 62368-1) and environmental compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC24CA | Lower PPK (1500 W), higher VC (42.5 V @ 35.3 A), same DO-214AB package | Not suitable for ISO 7637-2 Pulse 5a; limited to lower-energy transients | Select when cost sensitivity outweighs peak surge requirement and clamping margin allows ≥42.5 V |
| SMLJ24CA | Same VWM/VC specs, but rated for 3000 W with tighter VBR tolerance (26.7–28.4 V) and lower RθJA (60 °C/W) | Better thermal performance enables higher sustained surge duty cycles in compact layouts | Prefer when board space is constrained and thermal management is critical; requires verification of marking and reel packaging compatibility |
Compared with SAC24CA and SMLJ24CA, the SMDJ24CAH offers balanced surge robustness, automotive qualification, and broad industry acceptance-making it optimal for first-tier automotive suppliers and industrial OEMs requiring proven field reliability and full ISO 7637-2 coverage.
Availability
SMDJ24CAH is available at Aetrix Electronics and suitable for automotive power-line protection, industrial I/O hardening, telecom DC input safeguarding, and consumer equipment surge immunity requiring stable component supply across production lifecycles.
Supply support for SMDJ24CAH 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, with global distribution and AEC-Q101 validation capabilities.
The SMDJ series was developed specifically for high-energy transient suppression in automotive and industrial environments where reliability under harsh electrical stress and thermal cycling is mandatory.
FAQ
What does the "CAH" suffix indicate in SMDJ24CAH?
The "CAH" suffix denotes a bidirectional configuration: the SMDJ24CAH features symmetrical breakdown and clamping characteristics in both forward and reverse directions, enabling use in AC-coupled or polarity-agnostic protection circuits without external diode pairing. This differs from the unidirectional "AH" variant, which requires correct orientation during placement.
Is SMDJ24CAH compatible with lead-free reflow processes?
Yes, the SMDJ24CAH is fully compatible with standard lead-free reflow profiles. It meets J-STD-020 Moisture Sensitivity Level 1, meaning it can be subjected to peak temperatures up to 260°C without preconditioning or baking-supporting high-yield, high-throughput SMT assembly in modern electronics manufacturing.
Does SMDJ24CAH meet ISO 7637-2 for automotive applications?
Yes, the SMDJ24CAH is explicitly validated to meet ISO 7637-2 test pulses 1, 2a, 2b, 3a, and 3b. Its 3000 W peak power rating, sub-39 V clamping, and fast response enable robust protection against typical automotive transients including load dump, battery reversal, and inductive switching events.
What is the maximum clamping voltage of SMDJ24CAH under surge conditions?
The maximum clamping voltage of SMDJ24CAH is 38.9 V, measured at 77.1 A peak pulse current (IPPM) using the standard 10/1000 µs waveform. This value represents the upper bound of voltage seen by downstream circuitry during worst-case transient events, ensuring safe operation of 24 V-rated components.
How does SMDJ24CAH differ from SMDJ24AH?
The SMDJ24AH is unidirectional with a cathode band marking and forward conduction path, while the SMDJ24CAH is bidirectional with symmetrical characteristics and no polarity marking. The SMDJ24CAH supports AC or floating-line protection without orientation constraints, whereas SMDJ24AH must be placed with correct anode/cathode alignment relative to system ground.
SMDJ24CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- 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:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 77.1A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ24CAH FAQ
1.How can I place an order for SMDJ24CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ24CAH 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 SMDJ24CAH reliable?
The price and inventory of SMDJ24CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ24CAH is usually 5 days.
3.What payment methods are accepted for SMDJ24CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ24CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ24CAH?
SMDJ24CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ24CAH 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 SMDJ24CAH?
For technical support, including SMDJ24CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ24CAH requirements.
6.How does Aetrix verify that SMDJ24CAH is sourced from the original manufacturer or authorized distributors?
All SMDJ24CAH 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 SMDJ24CAH meets industry standards.
7.What is the process for return or replacement of SMDJ24CAH?
All SMDJ24CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ24CAH, 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 SMDJ24CAH part is unused and in its original packaging.
Return procedure for SMDJ24CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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