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Vishay General Semiconductor - Diodes Division SMAJ24HE3/5A
- Part No.:
- SMAJ24HE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24HE3/5A.pdf
- Description:
- TVS DIODE 24VWM 43VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,601
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Product details
Overview
SMAJ24HE3/5A from Vishay General Semiconductor is a high-reliability, AEC-Q101-qualified unidirectional transient voltage suppressor (TVS) in DO-214AC (SMA) package, designed for automotive and industrial overvoltage protection. It features 24 V stand-off voltage (VWM), 43.0 V maximum clamping voltage (VC) at 9.3 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 µs waveform), protecting MOSFETs and ICs against inductive switching transients.
For engineers reviewing the SMAJ24HE3/5A datasheet, SMAJ24HE3/5A pinout, SMAJ24HE3/5A application, or SMAJ24HE3/5A equivalent, key selection criteria include its AEC-Q101 qualification, 150 °C max junction temperature, 1.0 µA reverse leakage at VWM, DO-214AC mechanical compatibility, and automotive-grade whisker resistance (JESD 201 Class 2).
Technical Context
This TVS diode operates as a unidirectional clamping device with a glass-passivated junction and fast response time (<1 ps), enabling suppression of ESD and lightning-induced surges before sensitive downstream circuitry is damaged. Its low incremental surge resistance ensures minimal voltage overshoot during transient events.
The device is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine), supports solder reflow up to 260 °C (MSL Level 1), and maintains stable clamping performance across -55 °C to +150 °C operating junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 24 V rail protection. |
| VBR min/max | 26.7 V / 32.6 V at 1.0 mA - Breakdown voltage range ensures reliable turn-on within specification tolerance under test conditions. |
| VC @ IPPM | 43.0 V at 9.3 A - Clamped voltage during 10/1000 µs surge; limits stress on protected 24 V logic or power stages. |
| PPPM | 400 W - Peak pulse power handling capability; sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 transients. |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms); supports robust protection against load dump in automotive 12 V systems. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and high-ambient industrial settings. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; informs heatsinking requirements when mounted on 5.0 × 5.0 mm copper pads. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, molded plastic case with matte tin-plated leads, RoHS-compliant, AEC-Q101 qualified, MSL Level 1 (260 °C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential node in unidirectional configuration; conducts surge current to reference plane. |
| Cathode (banded end) | Clamping terminal | Connected to protected line (e.g., 24 V supply); initiates avalanche breakdown when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensors requiring high reliability. |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth under thermal cycling and humidity, critical for long-life automotive deployments. |
| Glass-passivated junction | Enhances stability and longevity versus epoxy-passivated alternatives, reducing parameter drift over temperature and life. |
| Low clamping ratio (VC/VWM = 1.79) | Minimizes overvoltage exposure during transients-critical for safeguarding 3.3 V or 5 V logic powered from protected 24 V rails. |
| 10/1000 µs waveform compliance | Meets industry-standard surge immunity testing per IEC 61000-4-5 and ISO 7637-2, ensuring design validation readiness. |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24 V CAN bus power lines and sensor supply rails in vehicle body control modules against load dump and jump-start transients. IC Role / Device Role: Unidirectional TVS clamp placed between 24 V input and chassis ground to shunt surge energy away from DC-DC converters and microcontrollers. Use Value: Withstands 40 A 8.3 ms surges and clamps to 43.0 V, preventing damage to downstream 24 V tolerant ICs while meeting OEM EMC requirements. |
Use Scenario: Safeguarding analog input channels (4–20 mA, 0–10 V) on programmable logic controller (PLC) modules exposed to field wiring transients. IC Role / Device Role: Primary overvoltage clamp on signal conditioning front-end, positioned before precision op-amps and ADCs. Use Value: 1.0 µA leakage at 24 V ensures no measurable error in high-impedance measurement circuits; fast response prevents latch-up in instrumentation amplifiers. |
| Telecom Power Feeds | Motor Drive Gate Driver Protection |
Use Scenario: Shielding 24 V auxiliary power inputs in remote radio head (RRH) enclosures from lightning-induced surges on outdoor cabling. IC Role / Device Role: First-line transient suppressor on DC input stage, upstream of bulk capacitors and PMICs. Use Value: 400 W peak power rating handles multiple IEC 61000-4-5 Level 3 surges without degradation; DO-214AC footprint allows dense board layout. |
Use Scenario: Protecting high-side gate driver ICs in 24 V BLDC motor controllers from inductive kickback during MOSFET switching. IC Role / Device Role: Clamp across gate driver supply (VDD) and ground to suppress ringing and overshoot exceeding 24 V rail rating. Use Value: 43.0 V clamping voltage stays well below typical 32 V absolute maximum ratings of gate drivers, avoiding permanent failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24AHE3/5A | Lower VBR range (26.7–29.5 V), tighter tolerance; clamps at 38.9 V @ 10.3 A. | Better suited for designs requiring lower clamping voltage and higher surge current margin on 24 V rails. | Select SMAJ24AHE3/5A when tighter VBR control and reduced VC are prioritized over absolute peak power rating. |
| SMBJ24HE3/5A | Same VWM/VC specs but in DO-214AA (SMB) package; 600 W PPPM rating. | Higher power handling and larger thermal mass; requires more PCB area and different pad layout. | Choose SMBJ24HE3/5A only if system-level surge testing demands >400 W capability and board space permits SMB footprint. |
Compared with SMAJ24HE3/5A, SMAJ24AHE3/5A offers lower clamping voltage for enhanced 24 V rail safety margins, while SMBJ24HE3/5A provides higher surge power capacity at the cost of larger footprint and altered thermal design-neither is pin-compatible due to differing DO-214AC vs. DO-214AA packages.
Availability
SMAJ24HE3/5A is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom power supplies, and motor drive systems requiring stable component supply with AEC-Q101 assurance and long-term lifecycle support.
Supply support for SMAJ24HE3/5A 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, combining AEC-Q101 qualification, robust surge handling, and surface-mount scalability for automated manufacturing.
FAQ
What is the maximum clamping voltage of SMAJ24HE3/5A under standard test conditions?
The SMAJ24HE3/5A has a maximum clamping voltage (VC) of 43.0 V when subjected to its rated peak pulse current of 9.3 A using the 10/1000 µs waveform. This value is measured at TA = 25 °C with specified mounting conditions (0.2 × 0.2 inch copper pads), and represents the upper limit of voltage seen by protected circuitry during a defined transient event. The SMAJ24HE3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ24HE3/5A suitable for automotive applications?
Yes, SMAJ24HE3/5A is explicitly qualified to AEC-Q101 standards and designated as high-reliability/automotive grade (HE3 suffix). It meets JESD 201 Class 2 whisker resistance requirements, operates from -55 °C to +150 °C, and is rated for 40 A 8.3 ms forward surge current-making it appropriate for engine control units, body electronics, and ADAS power domains. The SMAJ24HE3/5A is not a generic industrial part but a validated automotive-grade TVS.
What does the "HE3/5A" suffix indicate in SMAJ24HE3/5A?
The "HE3" suffix denotes RoHS-compliant, high-reliability/automotive grade construction with JESD 201 Class 2 whisker resistance, while "/5A" specifies packaging in 13-inch diameter plastic tape and reel with a base quantity of 7500 units. This distinguishes SMAJ24HE3/5A from commercial-grade "E3/5A" variants and confirms its suitability for automotive production environments where traceability and process control are mandatory. The SMAJ24HE3/5A ordering code reflects both qualification level and logistics format.
How does SMAJ24HE3/5A differ from SMAJ24AHE3/5A?
SMAJ24HE3/5A has a breakdown voltage range of 26.7–32.6 V and clamps at 43.0 V, whereas SMAJ24AHE3/5A features a tighter VBR range (26.7–29.5 V) and lower clamping voltage of 38.9 V at 10.3 A. Both share identical VWM (24 V), package (DO-214AC), and AEC-Q101 qualification. The SMAJ24AHE3/5A variant provides improved clamping consistency for designs where minimizing overvoltage stress is critical, but retains the same footprint and thermal characteristics as the SMAJ24HE3/5A.
What is the reverse leakage current specification for SMAJ24HE3/5A at rated VWM?
The SMAJ24HE3/5A exhibits a maximum reverse leakage current (ID) of 1.0 µA at its rated stand-off voltage of 24 V and TA = 25 °C. This low leakage ensures negligible power loss and no measurable impact on high-impedance circuits such as sensor bias networks or precision reference dividers. The SMAJ24HE3/5A maintains this specification across its full operating temperature range, supporting stable performance in battery-powered and low-power industrial systems.
SMAJ24HE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ24HE3/5A FAQ
1.How can I place an order for SMAJ24HE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24HE3/5A 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 SMAJ24HE3/5A reliable?
The price and inventory of SMAJ24HE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24HE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ24HE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24HE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24HE3/5A?
SMAJ24HE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24HE3/5A 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 SMAJ24HE3/5A?
For technical support, including SMAJ24HE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24HE3/5A requirements.
6.How does Aetrix verify that SMAJ24HE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ24HE3/5A 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 SMAJ24HE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ24HE3/5A?
All SMAJ24HE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24HE3/5A, 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 SMAJ24HE3/5A part is unused and in its original packaging.
Return procedure for SMAJ24HE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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