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Vishay General Semiconductor - Diodes Division SMAJ24CAHE3/5A
- Part No.:
- SMAJ24CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24CAHE3/5A.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,898
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Product details
Overview
SMAJ24CAHE3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 24 V stand-off voltage (VWM), 38.9 V maximum clamping voltage at 10.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the SMAJ24CAHE3/5A datasheet, SMAJ24CAHE3/5A pinout, SMAJ24CAHE3/5A application, or SMAJ24CAHE3/5A equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, AEC-Q101 qualification, and low-profile SMT placement are required - especially in 24 V rail interfaces and CAN/LIN bus front-end circuits.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) ranging from 26.7 V to 29.5 V at 1 mA test current and clamps to ≤38.9 V at 10.3 A IPPM. Its low incremental surge resistance and sub-nanosecond response time enable effective suppression of fast-rising transients induced by inductive switching or lightning surges.
Thermally rated for TJ = –55 °C to +150 °C, it delivers 3.3 W steady-state power dissipation and exhibits a typical junction-to-ambient thermal resistance of 120 °C/W on standard 5.0 mm × 5.0 mm copper pads. The HE3 suffix confirms RoHS compliance and AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 24 V - Maximum continuous reverse voltage before clamping begins; sets operating margin for 24 V nominal systems. |
| VBR (Breakdown Voltage) | 26.7–29.5 V at 1 mA - Ensures reliable turn-on above normal operating voltage while avoiding false triggering. |
| VC (Clamping Voltage) | 38.9 V at IPPM = 10.3 A - Limits transient voltage seen by downstream components during 400 W surge events. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Withstands high-energy transients common in automotive load-dump and inductive kick scenarios. |
| ID (Max Reverse Leakage) | 1.0 μA at 24 V - Negligible standby current draw, critical for low-power sensor and battery-backed circuits. |
| TJ Max | +150 °C - Supports operation in under-hood automotive environments and industrial enclosures without derating. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress-test requirements including temperature cycling, HTRB, and ESD. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Bidirectional configuration has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts surge current in either direction when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients from relay coil de-energization or motor commutation in 24 V systems. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| Low profile SMA package | 0.208" × 0.157" footprint supports high-density PCB layouts and automated reflow assembly. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity handling. |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog and digital signal lines from ESD and load-switching transients in wheel speed, temperature, or pressure sensors. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed at connector entry point before signal conditioning circuitry. Use Value: Maintains signal integrity under ISO 10605 ESD (±30 kV air) and ISO 7637-2 pulse 1/2a/3a, preventing latch-up or damage to ADC inputs. |
Use Scenario: Safeguarding 24 V DC digital input modules against field-wiring transients and ground bounce in factory automation. IC Role / Device Role / Timing Role: Primary surge suppressor on each channel's input line, located adjacent to terminal block. Use Value: Clamps induced surges to <39 V, ensuring compatibility with 3.3 V/5 V logic-level optocouplers and microcontrollers downstream. |
| Automotive CAN Bus Front-End | Consumer Appliance Motor Control |
Use Scenario: Transient suppression on CAN_H/CAN_L lines in telematics modules and gateway ECUs exposed to vehicle battery transients. IC Role / Device Role / Timing Role: Secondary protection stage after common-mode choke, shunting differential-mode surges. Use Value: Withstands repetitive 400 W pulses per ISO 16750-2, preserving bus integrity during jump-start or alternator load dump events. |
Use Scenario: Protecting MCU GPIO and gate driver inputs from back-EMF spikes generated by brushed DC motors in washing machines or HVAC blowers. IC Role / Device Role / Timing Role: Fast-response clamp on motor driver enable/control lines routed near high-current traces. Use Value: Limits voltage overshoot to 38.9 V, preventing permanent damage to 5 V tolerant I/O pins and enabling reliable PWM control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CA-M3/5A | No AEC-Q101 qualification; halogen-free, RoHS-compliant commercial grade only. | Suitable for non-automotive industrial or consumer use where automotive reliability testing is not mandated. | Select when cost sensitivity outweighs automotive qualification requirements and thermal/environmental stress is moderate. |
| SMBJ24CAHE3/5A | Same electrical specs but SMB (DO-214AA) package - 27% larger footprint and 10% higher RθJA (133 °C/W). | Better surge energy handling due to higher thermal mass; preferred where board space permits and higher IPPM margin is needed. | Choose for enhanced long-pulse robustness in high-temperature enclosures where SMA's compact size isn't mandatory. |
Compared with SMAJ24CAHE3/5A, the M3 variant lacks automotive qualification but reduces cost for commercial designs, while the SMBJ24CAHE3/5A trades board area for improved thermal performance and surge endurance - making each suitable for distinct reliability and layout constraints.
Availability
SMAJ24CAHE3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and CAN bus front-end circuits requiring stable component supply, AEC-Q101 traceability, and consistent surge performance across production batches.
Supply support for SMAJ24CAHE3/5A 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where fast, repeatable clamping and long-term stability are essential.
FAQ
What does the "CA" suffix indicate in SMAJ24CAHE3/5A?
The "CA" suffix denotes a bidirectional configuration: SMAJ24CAHE3/5A provides symmetrical clamping for both positive and negative transients, unlike unidirectional "A" variants. This makes SMAJ24CAHE3/5A ideal for AC-coupled lines, differential buses like CAN, or any application where polarity reversal cannot be guaranteed - eliminating need for external polarity management.
Is SMAJ24CAHE3/5A suitable for protecting a 24 V CAN FD interface?
Yes - SMAJ24CAHE3/5A is widely deployed for CAN FD front-end protection. Its 24 V VWM aligns with 24 V supply rails, 38.9 V VC ensures safe clamping below typical CAN transceiver absolute maximum ratings (e.g., 40 V), and AEC-Q101 qualification validates performance under automotive EMC stress conditions defined in ISO 11898-2 and ISO 16750-2.
How does the HE3 suffix affect the reliability of SMAJ24CAHE3/5A?
The HE3 suffix certifies that SMAJ24CAHE3/5A meets RoHS compliance and full AEC-Q101 qualification - including HTOL, TCT, UHAST, and ESD testing. This ensures validated lifetime reliability in automotive under-hood environments, with guaranteed performance over –40 °C to +125 °C ambient and proven resistance to mechanical shock, vibration, and humidity-induced failure modes.
What is the maximum recommended PCB pad size for optimal thermal performance of SMAJ24CAHE3/5A?
Vishay specifies 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated 400 W pulse power. Using smaller pads increases thermal resistance and reduces surge capability - e.g., halving pad area may lower IPPM by ~25%. For sustained reliability in high-duty-cycle applications, thermal vias under pads and internal ground planes are strongly recommended to maintain junction temperature below 150 °C.
Can SMAJ24CAHE3/5A replace SMAJ22CAHE3/5A in an existing design?
SMAJ24CAHE3/5A can substitute SMAJ22CAHE3/5A if the system's maximum operating voltage allows a 2 V increase in VWM (from 22 V to 24 V). However, its higher VBR (26.7–29.5 V vs. 24.4–26.9 V) delays clamping onset, potentially exposing downstream ICs to longer overvoltage exposure. Verify transient response timing and clamping margin with actual waveforms before replacement.
SMAJ24CAHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
SMAJ24CAHE3/5A FAQ
1.How can I place an order for SMAJ24CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24CAHE3/5A 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 SMAJ24CAHE3/5A reliable?
The price and inventory of SMAJ24CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ24CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24CAHE3/5A?
SMAJ24CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24CAHE3/5A 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 SMAJ24CAHE3/5A?
For technical support, including SMAJ24CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ24CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ24CAHE3/5A 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 SMAJ24CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ24CAHE3/5A?
All SMAJ24CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24CAHE3/5A, 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 SMAJ24CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ24CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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