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Taiwan Semiconductor Corporation SMDJ24CA
- Part No.:
- SMDJ24CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ24CA.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,777
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Product details
Overview
SMDJ24CA from Taiwan Semiconductor is a bidirectional 3000W 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 77.1A peak pulse current - used to protect power rails and I/O lines in industrial power supplies and telecom interfaces against ESD and lightning-induced transients.
For engineers reviewing the SMDJ24CA datasheet, SMDJ24CA pinout, SMDJ24CA application, or SMDJ24CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, 175°C junction rating, and DO-214AB thermal performance (RθJA = 75°C/W).
Technical Context
The SMDJ24CA implements a glass-passivated silicon avalanche junction optimized for high-energy transient suppression in bidirectional configurations. It delivers symmetrical clamping in both polarities, with guaranteed VBR min/max spread (26.7–29.5V) and tightly specified VC (38.9V @ 77.1A), enabling predictable overvoltage protection without polarity-sensitive layout constraints.
Its thermal design supports continuous operation up to TJ = 175°C and features RθJL = 15°C/W for efficient heat transfer to PCB copper. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - confirming suitability for lead-free reflow assembly without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin. |
| VBR @ IT=1mA | 26.7–29.5 V - Breakdown onset range; ensures reliable turn-on within 10% tolerance of nominal rating. |
| VC @ IPPM=77.1A | 38.9 V - Clamped voltage during 10/1000µs surge; limits downstream IC stress below 40V threshold. |
| PPK | 3000 W - Peak pulse power handling per 1ms waveform; supports automotive load-dump and lightning surge immunity. |
| TJ max | 175 °C - Maximum junction temperature; enables operation in enclosed industrial enclosures without derating. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.11 × 6.22 mm footprint and 2.3 mm height; compatible with automated pick-and-place. |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not functional in bidirectional SMDJ24CA); weight ≈ 0.290 g; UL 94V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | No polarity marking required; terminals interchangeable; clamps equally on positive and negative surges. |
| Case / Body | Thermal and mechanical reference | Non-conductive; provides mounting interface and primary heat dissipation path to PCB copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - essential for automotive and heavy-industrial equipment. |
| Sub-1 ps response time | Clamps transients before sensitive logic or analog circuitry responds - critical for protecting USB, RS-485, and Ethernet PHYs. |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS directives - supports green manufacturing and export compliance. |
| J-STD-020 Level 1 MSL | Zero floor life limitation; can be stored indefinitely at ambient conditions and placed directly into reflow without baking. |
Applications
| Industrial Power Supply Protection | Telecom Line Interface |
|---|---|
Use Scenario: 24V DC input rail in programmable logic controllers (PLCs) exposed to relay coil flyback and nearby motor switching noise. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed across input terminals to clamp ±30V transients before they reach DC-DC converter ICs. Use Value: Limits voltage excursion to ≤38.9V during 77.1A surges, preventing latch-up or gate oxide damage in upstream regulators. | Use Scenario: RS-485 data lines in outdoor base stations subjected to induced lightning surges on long cable runs. IC Role / Device Role / Timing Role: Primary line-side transient protector mounted differential across A/B bus lines, referenced to local ground. Use Value: Symmetrical clamping ensures equal protection for both signal polarities without requiring external bias or direction logic. |
| Automotive Body Control Module | Consumer Audio Power Input |
Use Scenario: 24V battery-supplied lighting control module enduring load-dump pulses per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Front-end TVS on main power entry, coordinated with fuse and LC filter to meet OEM surge immunity requirements. Use Value: 3000W peak power rating sustains multiple 10/1000µs pulses without degradation, supporting 15-year vehicle service life. | Use Scenario: AC-DC adapter input stage in premium home audio amplifiers, where EMI filters alone cannot suppress fast-rising ESD events. IC Role / Device Role / Timing Role: Secondary-level TVS after bulk rectification, guarding bridge rectifier and PFC controller inputs. Use Value: 24V VWM aligns with 28V peak rectified voltage, allowing normal operation while blocking >38.9V spikes from reaching sensitive analog stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC24 | Lower PPK (1500W), higher VC (43V @ 35A), same DO-214AB package | Not suitable for ISO 7637-2 Pulse 5a or repeated surge testing; limited to consumer-grade ESD-only use | Select only when cost sensitivity outweighs surge energy requirements and clamping voltage margin is ≥43V. |
| SMCJ24CA | Identical electrical specs (VWM=24V, VC=38.9V, PPK=3000W), same DO-214AB package, but manufactured by Littelfuse | Same functional role and board-level integration; validated in identical automotive and industrial designs | Drop-in alternative with identical footprint and performance; preferred where dual-sourcing or supply chain diversification is required. |
Compared with SAC24, SMDJ24CA delivers double the surge energy handling and tighter clamping; versus SMCJ24CA, it offers identical protection performance with Taiwan Semiconductor's qualification profile and traceability - making it optimal for long-lifecycle industrial deployments where second-source validation is not mandated.
Availability
SMDJ24CA is available at Aetrix Electronics and suitable for industrial power supply protection, telecom line interface hardening, automotive body control modules, and consumer audio power input circuits requiring stable component supply and full compliance with ISO 7637-2 and RoHS standards.
Supply support for SMDJ24CA 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 headquartered in Hsinchu, Taiwan, specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial and automotive markets.
The SMDJ series was engineered specifically for high-reliability transient suppression in harsh environments - emphasizing robust glass-passivated junctions, repeatable clamping, and AEC-Q200-aligned process controls for extended thermal cycling endurance.
FAQ
What is the maximum clamping voltage of the SMDJ24CA under a standard 10/1000µs surge?
The SMDJ24CA has a maximum clamping voltage (VC) of 38.9 V when subjected to a 77.1 A peak pulse current with a 10/1000 µs waveform. This value is measured at TA = 25°C and represents the upper limit of voltage seen by protected circuitry during worst-case transient events - critical for ensuring downstream components remain within absolute maximum ratings. The SMDJ24CA maintains this clamping performance across its full operating temperature range.
Is the SMDJ24CA unidirectional or bidirectional, and how does that affect PCB layout?
The SMDJ24CA is a bidirectional TVS diode, meaning it clamps symmetrically for both positive and negative transients without polarity dependence. Unlike unidirectional variants (e.g., SMDJ24A), it requires no cathode band orientation on the PCB - simplifying layout and eliminating risk of reverse installation. This makes the SMDJ24CA ideal for differential signal lines like RS-485 or AC-coupled power rails where polarity reversal is possible.
Does the SMDJ24CA meet automotive transient immunity standards?
Yes, the SMDJ24CA meets ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a/2b (supply interruption), and Pulse 3a/3b (capacitive coupling) requirements - all essential for automotive body electronics and infotainment systems. While not AEC-Q200 qualified itself, its construction (glass-passivated junction, 175°C TJ max, JESD201 Class 2 whisker resistance) aligns with automotive-grade reliability practices used in Tier-1 supplier designs.
What is the thermal resistance from junction to ambient for the SMDJ24CA in standard PCB mounting?
The SMDJ24CA has a typical junction-to-ambient thermal resistance (RθJA) of 75°C/W when mounted on a standard FR-4 PCB with minimum recommended copper pad area per the DO-214AB footprint. This value assumes no additional heatsinking; adding thermal vias or copper pours reduces RθJA significantly. Its low RθJL (15°C/W) further enables effective heat transfer to internal layers or chassis ground planes in thermally constrained industrial modules.
Can the SMDJ24CA be used in place of the SMDJ24A in an existing design?
No - the SMDJ24CA and SMDJ24A are not interchangeable without layout review. The SMDJ24A is unidirectional (cathode-marked) and clamps only in reverse bias, while the SMDJ24CA is bidirectional and clamps in both directions. Substituting one for the other may cause unintended conduction or failure to suppress positive-going transients. Always verify polarity requirements and clamping symmetry before replacement. The SMDJ24CA must be used only where bidirectional protection is explicitly needed.
SMDJ24CA 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ24CA FAQ
1.How can I place an order for SMDJ24CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ24CA 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 SMDJ24CA reliable?
The price and inventory of SMDJ24CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ24CA is usually 5 days.
3.What payment methods are accepted for SMDJ24CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ24CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ24CA?
SMDJ24CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ24CA 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 SMDJ24CA?
For technical support, including SMDJ24CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ24CA requirements.
6.How does Aetrix verify that SMDJ24CA is sourced from the original manufacturer or authorized distributors?
All SMDJ24CA 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 SMDJ24CA meets industry standards.
7.What is the process for return or replacement of SMDJ24CA?
All SMDJ24CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ24CA, 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 SMDJ24CA part is unused and in its original packaging.
Return procedure for SMDJ24CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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