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Vishay General Semiconductor - Diodes Division SMAJ24HE3/61
- Part No.:
- SMAJ24HE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24HE3/61.pdf
- Description:
- TVS DIODE 24VWM 43VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,536
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Product details
Overview
SMAJ24HE3/61 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 a 24 V stand-off voltage (VWM), 26.7–32.6 V breakdown voltage (VBR at 1 mA), 43.0 V maximum clamping voltage (VC) at 9.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - deployed to safeguard MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD.
For engineers reviewing the SMAJ24HE3/61 datasheet, SMAJ24HE3/61 pinout, SMAJ24HE3/61 application, or SMAJ24HE3/61 equivalent, this device is selected for robust surge immunity in automotive powertrain control units, industrial PLC I/O modules, and telecom DC power rails where AEC-Q101 qualification, low leakage (<1 µA at VWM), and stable clamping under repetitive surges are critical design requirements.
Technical Context
The SMAJ24HE3/61 employs a glass-passivated silicon avalanche junction optimized for fast response (<1 ps) and low incremental surge resistance. Its unidirectional polarity uses a cathode band marking and supports only reverse-biased transient suppression - forward conduction is limited to 3.5 V at 25 A per specification.
Thermal performance is defined by RθJA = 120 °C/W (on 0.2 × 0.2" copper pads) and RθJL = 30 °C/W, enabling reliable operation up to TJ = +150 °C. It meets MSL Level 1 (260 °C reflow), JESD201 Class 2 whisker resistance, and RoHS/WEEE compliance - confirming suitability for high-volume SMT assembly in harsh-environment applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; sets system DC rail compatibility. |
| VBR (min/max) | 26.7 V / 32.6 V at 1 mA - Confirmed breakdown range ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 43.0 V at 9.3 A - Clamping voltage limits protected circuit stress during 10/1000 µs surge events. |
| PPPM | 400 W - Peak pulse power handling capacity on standard PCB pad layout; derates above 78 V to 300 W. |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms) confirms robustness against motor-switching transients. |
| ID @ VWM | <1 µA - Ultra-low reverse leakage preserves battery-backed or low-power sensor node integrity. |
| TJ Range | −55 °C to +150 °C - Full automotive temperature range support without derating. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, matte tin-plated leads, RoHS-compliant, AEC-Q101 qualified high-reliability grade (HE3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input terminal | Connected to lower-potential side of protected line; enables unidirectional clamping when cathode is biased higher. |
| Cathode (marked with band) | Reverse-biased clamping node | Connected to higher-potential rail (e.g., VCC); avalanche conduction occurs here during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive powertrain and chassis systems requiring zero-failure reliability under thermal cycling and humidity exposure. |
| 400 W 10/1000 µs pulse rating | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV) on 50 Ω source impedance when properly laid out. |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term parameter stability across 1000+ thermal cycles. |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking; compatible with standard 260 °C lead-free reflow profiles. |
| Low clamping ratio (VC/VBR ≈ 1.6) | Minimizes voltage overshoot during transient events, reducing risk of downstream logic upset or latch-up. |
Applications
| Automotive Powertrain Control | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protecting microcontroller GPIOs and CAN transceiver power pins from load-dump and alternator ripple in engine control units. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12 V supply rail and ground, clamping transients within 1 ns to limit voltage excursion below 43 V. Use Value: Prevents permanent damage to 3.3 V/5 V logic interfaces during ISO 7637-2 Pulse 5a (load dump) events up to 60 V/100 ms. |
Use Scenario: Shielding 24 V digital input circuits in programmable logic controllers from inductive kickback of solenoid valves and contactors. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input terminals to absorb 400 W surges without degrading signal integrity during field wiring faults. Use Value: Eliminates need for external series resistors or RC snubbers while maintaining <1 µA leakage for accurate 24 V high/low detection. |
| Telecom DC Power Feeds | Automotive Body Electronics |
Use Scenario: Safeguarding PoE-powered Ethernet switch ports and base station RF front-end bias rails against lightning-induced surges on -48 V DC feeds. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to negative rail, activated only during positive-going transients exceeding 24 V. Use Value: Maintains <100 pF junction capacitance at 0 V bias (per Fig. 4), avoiding signal distortion on high-speed data lines sharing same PCB layer. |
Use Scenario: Securing LIN bus transceivers and LED driver ICs in door module ECUs exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage TVS mounted directly at connector entry point, providing first-line defense before protection diodes inside transceiver ICs. Use Value: Achieves >15 kV air-gap ESD immunity (IEC 61000-4-2) without compromising sleep-mode current budget due to sub-µA VWM leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24AHE3/61 | Lower VBR range (26.7–29.5 V), tighter 10% VWM tolerance, 38.9 V clamping at 10.3 A. | Better suited for precision 24 V systems where tighter clamping margin is required and lower surge current suffices. | Select SMAJ24AHE3/61 when clamping voltage headroom is constrained and peak surge energy is ≤350 W. |
| SMCJ24HE3/61 | Same VWM/VBR, but DO-214AB (SMC) package; 1500 W PPPM, 128 A IPPM, 39.4 V VC. | Higher power handling enables use in main DC input protection where surge currents exceed 9.3 A. | Choose SMCJ24HE3/61 for primary board-level protection; SMAJ24HE3/61 remains optimal for point-of-load secondary protection. |
Compared with SMAJ24AHE3/61, the SMAJ24HE3/61 offers higher clamping voltage but greater surge current margin; versus SMCJ24HE3/61, it trades power capacity for smaller footprint and lower parasitic inductance - making SMAJ24HE3/61 ideal for space-constrained, high-frequency transient suppression near sensitive ICs.
Availability
SMAJ24HE3/61 is available at Aetrix Electronics and suitable for automotive powertrain control units, industrial PLC I/O modules, and telecom DC power feeds requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMAJ24HE3/61 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 high-reliability diodes, rectifiers, and protection devices engineered for automotive, industrial, and computing applications.
The SMAJ series was developed specifically for surface-mount transient suppression in harsh environments, emphasizing AEC-Q101 qualification, tight parametric control, and compatibility with automated SMT assembly processes.
FAQ
What is the clamping voltage of SMAJ24HE3/61 under a 10/1000 µs surge?
The SMAJ24HE3/61 has a maximum clamping voltage (VC) of 43.0 V at 9.3 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured with the device mounted on 0.2 × 0.2" copper pads per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ24HE3/61 maintains this clamping performance across its full operating temperature range.
Is SMAJ24HE3/61 suitable for automotive applications?
Yes, SMAJ24HE3/61 is explicitly qualified to AEC-Q101 for high-reliability automotive use. Its HE3 suffix denotes high-reliability/automotive grade, including validation for thermal cycling, humidity resistance, and mechanical shock. The SMAJ24HE3/61 is deployed in engine control units, body control modules, and ADAS sensor interfaces where sustained operation from −55 °C to +150 °C and immunity to load-dump transients are mandatory. The SMAJ24HE3/61 meets all relevant automotive test requirements per the Vishay qualification report.
How does SMAJ24HE3/61 differ from SMAJ24AHE3/61?
The SMAJ24HE3/61 has a wider breakdown voltage range (26.7–32.6 V) and higher clamping voltage (43.0 V) than the SMAJ24AHE3/61 (26.7–29.5 V, 38.9 V). The "A" suffix indicates tighter VBR tolerance (5% vs. 10%) and lower clamping, making SMAJ24AHE3/61 preferable for precision 24 V rails. Both share identical package, AEC-Q101 qualification, and 400 W rating, but the SMAJ24HE3/61 delivers higher surge current margin (9.3 A vs. 10.3 A) at the cost of slightly elevated clamping. The SMAJ24HE3/61 remains the default choice unless tighter VBR control is required.
What is the maximum reverse leakage current for SMAJ24HE3/61 at rated VWM?
The SMAJ24HE3/61 exhibits a maximum reverse leakage current (ID) of 1.0 µA at its rated stand-off voltage (VWM) of 24 V and ambient temperature of 25 °C. This ultra-low leakage is confirmed in the Vishay datasheet Table "ELECTRICAL CHARACTERISTICS" and ensures minimal impact on battery-powered or high-impedance sensing circuits. Leakage remains below 5 µA up to +85 °C, supporting reliable operation in extended-temperature industrial deployments. The SMAJ24HE3/61 achieves this while maintaining full AEC-Q101 qualification.
Does SMAJ24HE3/61 have polarity marking, and how is it oriented in circuit?
Yes, SMAJ24HE3/61 is unidirectional and features a visible cathode band marking on the DO-214AC (SMA) package body. During circuit layout, the banded end must be connected to the higher-potential node (e.g., 24 V rail), and the unbanded (anode) end to ground or lower potential. This orientation ensures avalanche conduction only during reverse overvoltage events - forward conduction is limited to 3.5 V at 25 A and is not intended for regular operation. Correct polarity alignment is essential for effective transient suppression; reversing the SMAJ24HE3/61 renders it nonfunctional for its intended protection role.
SMAJ24HE3/61 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)
SMAJ24HE3/61 FAQ
1.How can I place an order for SMAJ24HE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24HE3/61 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 SMAJ24HE3/61 reliable?
The price and inventory of SMAJ24HE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24HE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ24HE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24HE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24HE3/61?
SMAJ24HE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24HE3/61 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 SMAJ24HE3/61?
For technical support, including SMAJ24HE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24HE3/61 requirements.
6.How does Aetrix verify that SMAJ24HE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ24HE3/61 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 SMAJ24HE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ24HE3/61?
All SMAJ24HE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24HE3/61, 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 SMAJ24HE3/61 part is unused and in its original packaging.
Return procedure for SMAJ24HE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ24HE3/61 Tags
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