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Vishay General Semiconductor - Diodes Division SMAJ24CAHE3_A/H
- Part No.:
- SMAJ24CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24CAHE3_A/H.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,429
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Product details
Overview
SMAJ24CAHE3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust ESD and surge protection on signal/power lines. It features 24 V standoff voltage (VWM), 38.9 V maximum clamping voltage (VC) at 10.3 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), making it suitable for protecting MOSFET gates, sensor interfaces, and automotive control modules against inductive switching transients.
For engineers reviewing the SMAJ24CAHE3_A/H datasheet, SMAJ24CAHE3_A/H pinout, SMAJ24CAHE3_A/H application, or SMAJ24CAHE3_A/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<1 μA leakage at 24 V), but triggers rapidly (<1 ns response) when transient voltage exceeds its 26.7–29.5 V breakdown range (VBR at 1 mA). Its bidirectional structure enables symmetric suppression of both positive and negative polarity surges without polarity-sensitive layout constraints.
Thermally, it relies on PCB copper pad conduction (0.2" × 0.2" recommended) to dissipate energy, with junction-to-ambient thermal resistance of 120 °C/W and junction-to-lead resistance of 30 °C/W. The device is rated for continuous operation from –55 °C to +150 °C and supports repetitive surge duty cycles up to 0.01 % (300 W derated above 78 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 26.7 V / 29.5 V at 1 mA - Confirmed breakdown window ensures reliable triggering across process variation and temperature. |
| VC @ IPPM | 38.9 V at 10.3 A - Clamping voltage during 10/1000 μs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 400 W - Peak pulse power handling capability per JEDEC standard waveform; validates protection level against IEC 61000-4-5 Level 4 surges. |
| IPPM | 10.3 A - Peak surge current supported at VC; used to size PCB trace width and verify system-level surge compliance. |
| TJ max | +150 °C - Maximum junction temperature rating; enables use in under-hood automotive environments and industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. No polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (negative polarity events) | Provides symmetrical conduction path during negative-going surges; connects to line being protected. |
| Cathode | Transient current entry point (positive polarity events) | Provides symmetrical conduction path during positive-going surges; connects to line being protected. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management. |
| AEC-Q101 qualification | Validates long-term reliability in automotive applications including engine control units and body electronics modules. |
| 400 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive equipment up to Level 4. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, reducing risk of latch-up or gate oxide damage in downstream ICs. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free reflow profiles without preconditioning or special handling requirements. |
Applications
| Automotive Body Control Module | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting LIN bus transceivers and door lock actuator drivers from load dump and inductive kickback in 12 V vehicle systems. IC Role / Device Role / Timing Role: Shunt TVS diode placed directly at connector entry point to clamp transients before reaching ASIC or microcontroller I/O pins. Use Value: Prevents permanent damage to LIN transceivers during battery disconnect events and relay coil de-energization, maintaining communication integrity. |
Use Scenario: Safeguarding 4–20 mA current loop inputs and RS-485 transceivers in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional clamping element on differential signal pairs to absorb common-mode surges induced by nearby motor drives or welding equipment. Use Value: Eliminates need for separate unidirectional devices per line, reducing BOM count while maintaining ±38.9 V clamping symmetry across both polarities. |
| Consumer Appliance Motor Drive | Automotive Camera Power Line |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers connected to MCU-based motor controllers. IC Role / Device Role / Timing Role: Low-capacitance TVS placed between motor supply rail and ground to divert sub-100 ns spikes generated during brush arcing. Use Value: Reduces electromagnetic interference (EMI) coupling into adjacent analog sensor circuits and prevents false resets of motor control firmware. |
Use Scenario: Protecting 12 V power input to ADAS camera modules mounted near engine compartments exposed to ISO 7637-2 pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail upstream of DC-DC converter, sized for 400 W surge absorption. Use Value: Ensures uninterrupted camera operation during cold-crank and load-dump events, meeting OEM functional safety requirements for vision systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CA-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No difference in circuit performance or layout; differs only in material composition and environmental compliance documentation. | Select when halogen-free bill-of-materials (BOM) is mandated by regional environmental regulations or OEM sustainability policies. |
| SMBJ24CAHE3_A/H | Same VWM/VC specs but in larger SMB (DO-214AA) package with higher PPPM (600 W) and lower RθJA (80 °C/W). | Requires larger PCB footprint; better suited for higher-energy surge environments where 400 W margin is insufficient. | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 or when thermal budget demands lower junction temperature rise. |
Compared with SMAJ24CAHE3_A/H, SMAJ24CA-M3/61 offers identical protection performance with halogen-free construction, while SMBJ24CAHE3_A/H provides higher surge capacity and improved thermal dissipation at the cost of increased board area-enabling trade-offs between space-constrained designs and higher-reliability surge margins.
Availability
SMAJ24CAHE3_A/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer appliance motor controls, and ADAS camera power protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ24CAHE3_A/H 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and consumer systems where compact size, fast response, and AEC-Q101 validation are critical design requirements.
FAQ
What is the clamping voltage of SMAJ24CAHE3_A/H at its rated peak pulse current?
The SMAJ24CAHE3_A/H has a maximum clamping voltage (VC) of 38.9 V at 10.3 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in Vishay's official datasheet revision 09-Jan-2024, Document Number 88390. Designers use this parameter to verify that downstream components remain within their absolute maximum ratings during transient conditions.
Is SMAJ24CAHE3_A/H qualified for automotive applications?
Yes, SMAJ24CAHE3_A/H is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet under "MECHANICAL DATA" and "ORDERING INFORMATION." The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified construction. This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing-making SMAJ24CAHE3_A/H suitable for under-hood and chassis-mounted automotive electronics where reliability is mission-critical.
What is the standoff voltage (VWM) and why does it matter for SMAJ24CAHE3_A/H?
The standoff voltage (VWM) of SMAJ24CAHE3_A/H is 24 V-the maximum continuous reverse voltage the device can withstand without entering breakdown. This parameter ensures minimal leakage current (<1 μA) during normal operation while providing sufficient margin below the 26.7–29.5 V breakdown range (VBR). Selecting a VWM correctly avoids false triggering during nominal supply fluctuations and guarantees reliable protection only during actual overvoltage events.
How does the bidirectional nature of SMAJ24CAHE3_A/H affect its circuit implementation?
Because SMAJ24CAHE3_A/H is bidirectional, it provides symmetrical clamping for both positive and negative polarity transients without requiring polarity-aware routing or additional components. Unlike unidirectional TVS diodes, it has no cathode marking and connects across the protected line and ground (or reference rail) with no orientation dependency. This simplifies layout in AC-coupled, differential, or floating signal paths-such as LIN bus, RS-485, or sensor excitation lines-where polarity reversal is possible or undefined.
What package type does SMAJ24CAHE3_A/H use and what are its mounting requirements?
SMAJ24CAHE3_A/H uses the SMA (DO-214AC) surface-mount package-a low-profile, two-terminal case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. Recommended mounting uses 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve specified thermal performance (RθJA = 120 °C/W) and 400 W pulse power rating. The device meets MSL Level 1 and supports standard lead-free reflow profiles up to 260 °C peak.
SMAJ24CAHE3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- 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):
- 10.3A
- 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)
SMAJ24CAHE3_A/H FAQ
1.How can I place an order for SMAJ24CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24CAHE3_A/H 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 SMAJ24CAHE3_A/H reliable?
The price and inventory of SMAJ24CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ24CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24CAHE3_A/H?
SMAJ24CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24CAHE3_A/H 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 SMAJ24CAHE3_A/H?
For technical support, including SMAJ24CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ24CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ24CAHE3_A/H 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 SMAJ24CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ24CAHE3_A/H?
All SMAJ24CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24CAHE3_A/H, 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 SMAJ24CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ24CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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