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Alpha & Omega Semiconductor Inc. SMDJ24CA
- Part No.:
- SMDJ24CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ24CA.pdf
- Description:
- 1CH 24V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:5,867
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Product details
Overview
SMDJ24CA from Alpha & Omega Semiconductor is a bi-directional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 24.0 V reverse stand-off voltage (VRWM), 26.7–29.5 V breakdown voltage (VBR) at 1 mA, 38.9 V maximum clamping voltage (VC) at 77.2 A peak pulse current, and 3000 W peak pulse power dissipation on a 10/1000 µs waveform - deployed in industrial motor drives, telecom power supplies, and automotive body control modules.
For engineers reviewing the SMDJ24CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, DO-214AB package compatibility with high-power surface-mount layouts, thermal resistance (RθJA = 75 °C/W), and compliance with IEC 61000-4-2/4-4/4-5 surge immunity requirements.
Technical Context
The SMDJ24CA operates as a silicon avalanche diode with glass-passivated junction, enabling fast response time (<1.0 ps from 0 V to VBR) and stable clamping under repetitive transients at 0.01% duty cycle. Its bi-directional polarity supports symmetrical surge suppression on AC-coupled or floating lines without external series components.
Thermal design relies on low thermal resistance: RθJL = 15 °C/W (junction-to-lead) and RθJA = 75 °C/W (junction-to-ambient) when mounted on 8.0 mm × 8.0 mm copper pads per terminal. Maximum operating junction temperature is rated at 150 °C, with storage range from –55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 24.0 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin. |
| VBR @ IT=1mA | 26.7–29.5 V - Measured breakdown threshold; ensures reliable turn-on during ESD or lightning-induced surges. |
| VC @ IPPM | 38.9 V at 77.2 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 3000 W - Peak pulse power handling capacity; enables survival of high-energy transients per IEC 61000-4-5. |
| Polarity | Bi-directional - Provides symmetrical clamping for AC signals, differential buses, or ungrounded systems without polarity concerns. |
| Package | DO-214AB (SMC J-Bend) - Surface-mount outline with J-bent leads; supports automated placement and high-current solder joints. |
| IR @ VRWM | 2.0 µA - Reverse leakage at rated stand-off voltage; ensures minimal quiescent power loss in always-on protection circuits. |
Pinout & Package
DO-214AB (SMC J-Bend) package: molded plastic case with matte tin lead-free plating, JEDEC-compliant outline, and cathode band marking for polarity identification. Bidirectional operation eliminates functional polarity dependence, but physical marking aligns with standard diode orientation conventions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Bidirectional) | Surge current path | Both terminals conduct equally during positive or negative transients; no dedicated anode/cathode function in operation. |
| Case / Body | Thermal conduction path | Plastic case transfers heat to PCB copper pads; requires 8.0 mm × 8.0 mm copper area per terminal for rated RθJA. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables clamping before sensitive downstream ICs experience voltage overshoot beyond absolute maximum ratings. |
| Glass passivated junction | Stable VBR tolerance and long-term reliability - Resists moisture ingress and electrochemical degradation in humid or contaminated environments. |
| MSL1 rating | Reflow-compatible up to 260 °C peak - Supports single-pass lead-free reflow without popcorn or delamination failure modes. |
| UL 94V-0 flammability | Self-extinguishing plastic housing - Meets safety standards for enclosed power electronics in industrial and transportation equipment. |
| Built-in strain relief | Mechanically robust lead termination - Reduces solder joint fatigue under thermal cycling or board flexure in automotive and rail applications. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensing circuits against IGBT switching transients and load dump events. IC Role / Device Role: Primary overvoltage clamp on 24 V auxiliary supply rails and isolated gate drive outputs. Use Value: Limits transient voltage to ≤38.9 V, preventing latch-up or permanent damage to 36 V-rated op-amps and logic-level MOSFETs. | Use Scenario: Surge suppression on -48 V DC input and intermediate 12 V distribution rails in base station power systems. IC Role / Device Role: Bi-directional TVS placed across input terminals and between primary/secondary grounds to meet IEC 61000-4-5 Level 4. Use Value: Absorbs 3000 W pulses without degradation, maintaining system uptime during lightning-induced surges on outdoor feeder lines. |
| Automotive Body Control Modules | Industrial PLC I/O Terminals |
Use Scenario: Protection of LIN bus transceivers and microcontroller GPIOs against battery reverse connection and jump-start transients. IC Role / Device Role: Bidirectional clamping element on 12 V supply inputs and LIN signal lines (e.g., LIN PHY VCC and TX/RX pins). Use Value: Withstands ±3000 W pulses while holding clamped voltage below 40 V, ensuring ISO 16750-2 compliance for 12 V vehicle systems. | Use Scenario: Input/output protection on analog current loop (4–20 mA) and digital dry-contact interfaces exposed to field wiring surges. IC Role / Device Role: First-line transient suppressor on terminal blocks and isolation barrier inputs in modular I/O cards. Use Value: Delivers 77.2 A peak pulse current handling with <2 µA leakage, preserving signal integrity and minimizing offset errors in precision measurement circuits. |
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 | Same DO-214AB package; 24 V VRWM; lower PPPM (1500 W); higher VC (43 V @ 35 A) | Limited to lower-energy transients; not suitable for IEC 61000-4-5 Level 4 testing | Select only where surge energy is constrained to ≤1500 W and layout space limits use of larger packages. |
| SMCJ24CA | Same electrical specs (24 V VRWM, 3000 W PPPM) but in DO-214AB variant with tighter VBR tolerance (±5% vs ±10% for SMDJ24CA) | Preferred for high-reliability designs requiring tighter clamping consistency across temperature and lot variance | Choose when production yield and long-term parametric stability outweigh cost sensitivity. |
Compared with SAC24 and SMCJ24CA, the SMDJ24CA offers balanced performance: higher surge capacity than SAC24 for demanding environments, and broader VBR tolerance than SMCJ24CA for relaxed binning and cost-effective volume procurement - making it optimal for industrial-grade power rail protection where robustness and supply chain flexibility are prioritized.
Availability
SMDJ24CA is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply across multi-year production cycles and global manufacturing sites.
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
Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, TVS diodes, and power ICs for computing, consumer, industrial, and automotive markets.
The SMDJ series is engineered for high-power transient suppression in harsh environments, targeting applications needing 3000 W surge handling, bi-directional symmetry, and extended temperature operation up to 150 °C junction.
FAQ
What is the clamping voltage of the SMDJ24CA under a 10/1000 µs surge?
The SMDJ24CA has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current of 77.2 A on a 10/1000 µs waveform. This value is measured per industry-standard test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components remain within their absolute maximum voltage ratings.
Is the SMDJ24CA unidirectional or bidirectional?
The SMDJ24CA is a bidirectional TVS diode, indicated by the "CA" suffix. It provides symmetrical clamping for both positive and negative transients, making it suitable for AC-coupled lines, differential data buses, or floating power domains where polarity cannot be assumed - unlike unidirectional variants (e.g., SMDJ24A) that require correct orientation relative to ground.
What package does the SMDJ24CA use, and what are its mounting requirements?
The SMDJ24CA uses the DO-214AB (SMC J-Bend) surface-mount package. For full thermal and electrical performance, it must be mounted on 8.0 mm × 8.0 mm copper pads per terminal, per the datasheet's RθJA specification. The matte tin lead-free finish supports lead-free reflow up to 260 °C peak temperature (MSL1).
Does the SMDJ24CA meet RoHS and halogen-free standards?
Yes, the SMDJ24CA is an AOS Green Product: fully RoHS compliant, lead-free, and halogen-free per AOS' published Green Policy. It meets JEDEC J-STD-020 MSL1 reflow requirements and carries UL 94V-0 flammability certification - confirming suitability for environmentally regulated industrial and automotive end equipment.
How does the SMDJ24CA compare to the SMDJ24A in terms of functionality?
The SMDJ24CA is bidirectional, while the SMDJ24A is unidirectional. Both share identical VRWM (24.0 V), VBR (26.7–29.5 V), and PPPM (3000 W) ratings, but the SMDJ24CA clamps symmetrically on both polarities - eliminating need for polarity-aware layout. The SMDJ24A requires correct cathode-to-ground orientation and is used where only one polarity of surge is expected.
SMDJ24CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- 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):
- 77.2A
- Power - Peak Pulse:
- 3000W (3kW)
- 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
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.
SMDJ24CA Tags
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