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Alpha & Omega Semiconductor Inc. SMDJ24A
- Part No.:
- SMDJ24A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ24A.pdf
- Description:
- 1CH 24V UNIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:6,074
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Product details
Overview
SMDJ24A from Alpha & Omega Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power lines and signal interfaces. It features a 24.0 V reverse standoff voltage (VRWM), 26.7–29.5 V breakdown voltage (VBR @ 1 mA), 38.9 V maximum clamping voltage at 77.2 A peak pulse current, and 3000 W peak pulse power rating on 10/1000 µs waveform - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMDJ24A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under IEC 61000-4-5 surge conditions, thermal resistance (RθJL = 15 °C/W), unidirectional polarity with cathode band marking, and DO-214AB package compatibility with automated SMT assembly.
Technical Context
The SMDJ24A operates as a silicon avalanche diode optimized for fast transient suppression. Its glass-passivated junction enables sub-1 ps response time from 0 V to breakdown, while its low-profile DO-214AB package supports high-density PCB layouts and meets J-STD-020 MSL Level 1 reflow requirements (260 °C peak).
Designed for single-polarity DC line protection, it delivers stable clamping across -55 °C to +150 °C junction temperature range. Thermal performance is defined by RθJA = 75 °C/W (on 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W, enabling reliable power derating in thermally constrained environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 24.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1 mA | 26.7–29.5 V - Confirmed avalanche breakdown range ensuring predictable turn-on threshold |
| Vc @ IPPM | 38.9 V - Clamping voltage at 77.2 A peak pulse current, limiting downstream voltage stress |
| PPPM (10/1000 µs) | 3000 W - Peak surge energy handling capability compliant with IEC 61000-4-5 Level 4 |
| TJ max / TSTG | -55 °C to +150 °C - Full industrial temperature range support without derating loss |
| RθJL | 15 °C/W - Low junction-to-lead thermal resistance enabling efficient heat transfer to PCB copper |
| Polarity | Unidirectional - Cathode-band marked device for DC rail protection with defined conduction direction |
Pinout & Package
DO-214AB (SMC J-Bend) surface-mount package with molded plastic case, matte tin lead-free plating, and JEDEC-standard mechanical dimensions. Cathode indicated by color band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side of protected line (e.g., GND or return path) |
| Cathode | Current exit terminal during reverse clamping | Marked with band; connected to protected line (e.g., +24 V rail) to shunt transients to ground |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables clamping before sensitive ICs experience overvoltage damage |
| Glass passivated junction | Improved long-term reliability and leakage stability under thermal cycling |
| Built-in strain relief | Reduces mechanical stress at lead-to-package interface during board flexure or thermal expansion |
| MSL Level 1 compliance | Supports standard Pb-free reflow without pre-baking (260 °C peak, J-STD-020) |
| UL 94V-0 flammability rating | Self-extinguishing plastic housing meets safety standards for enclosed industrial equipment |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 24 V DC input rails in programmable logic controllers (PLCs) against load dump and inductive switching surges. IC Role / Device Role: Primary TVS clamp placed upstream of DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤38.9 V at 77.2 A, preventing latch-up or gate oxide rupture in downstream SiC MOSFET drivers. | Use Scenario: Safeguarding LIN bus power inputs and sensor supply lines in BCMs exposed to ISO 7637-2 Pulse 5a (load dump). IC Role / Device Role: Unidirectional surge suppressor on +24 V battery feed to MCU power domain. Use Value: Withstands 3000 W surges while maintaining VRWM = 24.0 V - matches nominal vehicle system voltage without false triggering. |
| Telecom Remote Radio Unit (RRU) | Renewable Energy Inverter DC Link |
Use Scenario: Shielding auxiliary 24 V management circuitry in outdoor RRUs from lightning-induced surges on power-over-ethernet (PoE) derived supplies. IC Role / Device Role: Secondary-level TVS on regulated 24 V bias rail feeding FPGAs and ADCs. Use Value: Sub-1 ps response ensures clamping occurs before 100 ns transients propagate into timing-critical RF subsystems. | Use Scenario: Protecting gate driver ICs and current sense amplifiers on the 24 V auxiliary supply of solar string inverters subject to grid-switching transients. IC Role / Device Role: High-power unidirectional TVS on isolated DC link monitoring circuitry. Use Value: 3000 W rating handles repetitive 10/1000 µs surges per IEC 61000-4-5, supporting 20-year field life in harsh outdoor environments. |
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 PPPM (1500 W), higher Vc (43.0 V @ 35 A), same DO-214AB package | Rated for lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 | Select only where surge threat level is limited to IEC 61000-4-2 ESD or low-duty-cycle spikes |
| 1.5KE24A | Through-hole DO-201 package, identical electrical specs but incompatible with SMT production | Requires manual or wave soldering; not suitable for high-volume automated assembly | Use only for prototyping or legacy through-hole designs where rework is acceptable |
Compared with SAC24 and 1.5KE24A, the SMDJ24A delivers 2× higher surge power handling in an SMT-optimized package with tighter VBR tolerance and superior thermal resistance - making it the preferred choice for production-grade 24 V DC systems requiring IEC-compliant robustness and automated manufacturability.
Availability
SMDJ24A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom remote radio units requiring stable component supply, full RoHS and halogen-free compliance, and traceable lot-level sourcing.
Supply support for SMDJ24A 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 industrial, computing, and automotive markets.
The SMDJ series is engineered specifically for high-reliability transient suppression in 5–250 V DC systems, emphasizing low clamping ratio, fast response, and ruggedized packaging for harsh-environment deployment.
FAQ
What is the clamping voltage of the SMDJ24A under maximum rated surge current?
The SMDJ24A exhibits a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current (IPPM) of 77.2 A on a 10/1000 µs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during worst-case surge events - critical for ensuring downstream components remain within absolute maximum ratings. The SMDJ24A maintains this clamping performance across its full operating temperature range.
Does the SMDJ24A support bidirectional transient suppression?
No, the SMDJ24A is a unidirectional TVS diode, intended exclusively for DC line protection where polarity is fixed. Bidirectional operation requires the SMDJ24CA variant, which features symmetrical breakdown in both directions and is marked with a "CA" suffix. Using the SMDJ24A in AC or bipolar signal paths will result in forward conduction during negative half-cycles and potential failure. Always verify polarity alignment before integrating the SMDJ24A into a design.
What is the thermal resistance specification for the SMDJ24A, and how does it impact layout?
The SMDJ24A has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads. This means effective heat dissipation relies heavily on adequate copper area and thermal vias beneath the leads. For sustained surge duty cycles or elevated ambient temperatures, designers must allocate sufficient copper pour and avoid narrow traces - otherwise, junction temperature may exceed the 150 °C maximum and degrade clamping consistency. The SMDJ24A's RθJL enables direct thermal coupling to internal ground planes.
Is the SMDJ24A compatible with lead-free reflow processes?
Yes, the SMDJ24A is fully compatible with standard lead-free reflow soldering per J-STD-020. It is rated MSL Level 1 with a maximum peak temperature of 260 °C and requires no pre-baking. Its matte tin lead-free plating and DO-214AB package construction ensure robust wetting and intermetallic formation during reflow. AOS confirms full compliance with RoHS and halogen-free requirements, and the SMDJ24A carries the AOS Green Product designation - verified in Rev. 1.2 (July 2021) datasheet.
How does the SMDJ24A's breakdown voltage tolerance affect circuit margining?
The SMDJ24A has a specified VBR range of 26.7–29.5 V at 1 mA test current, representing ±10% tolerance around the nominal 28.1 V midpoint. This directly impacts system-level margining: designers must ensure the protected circuit's absolute maximum input voltage exceeds 29.5 V to prevent premature clamping during normal operation, while also confirming that the clamping voltage (38.9 V) remains below the withstand rating of downstream components. The SMDJ24A's tight tolerance supports predictable, repeatable protection behavior across production lots.
SMDJ24A 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:
- 1
- Bidirectional Channels:
- -
- 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
SMDJ24A FAQ
1.How can I place an order for SMDJ24A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ24A 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 SMDJ24A reliable?
The price and inventory of SMDJ24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ24A is usually 5 days.
3.What payment methods are accepted for SMDJ24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ24A?
SMDJ24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ24A 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 SMDJ24A?
For technical support, including SMDJ24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ24A requirements.
6.How does Aetrix verify that SMDJ24A is sourced from the original manufacturer or authorized distributors?
All SMDJ24A 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 SMDJ24A meets industry standards.
7.What is the process for return or replacement of SMDJ24A?
All SMDJ24A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ24A, 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 SMDJ24A part is unused and in its original packaging.
Return procedure for SMDJ24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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