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Vishay General Semiconductor - Diodes Division SMAJ24CAHE3_A/I
- Part No.:
- SMAJ24CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24CAHE3_A/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:17,081
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Product details
Overview
SMAJ24CAHE3_A/I 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 (VC) at 10.3 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ24CAHE3_A/I datasheet, SMAJ24CAHE3_A/I pinout, SMAJ24CAHE3_A/I application, or SMAJ24CAHE3_A/I equivalent, key selection criteria include bidirectional surge protection capability, AEC-Q101 qualification, low clamping ratio (VC/VWM = 1.62), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both directions due to its bidirectional construction. Its glass-passivated junction enables fast response time (<1 ns) and stable leakage performance (ID ≤ 1.0 μA at VWM), while the SMA package supports high thermal dissipation (RθJA = 120 °C/W) under transient stress.
The SMAJ24CAHE3_A/I meets AEC-Q101 requirements for automotive-grade reliability and is rated for -55 °C to +150 °C operating junction temperature. Its 300–400 W peak pulse power rating is derated above 78 V, but remains at full 400 W for this 24 V variant, enabling robust protection against ISO 7637-2 load dump and EFT bursts without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 24 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 26.7–29.5 V at 1.0 mA - Confirmed minimum/maximum breakdown threshold ensuring consistent turn-on across production lots. |
| VC (Clamping Voltage) | 38.9 V at IPPM = 10.3 A - Peak voltage seen by protected circuit during worst-case 10/1000 μs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 400 W - Surge energy handling capacity with standard 10/1000 μs waveform; validated on 5.0 mm × 5.0 mm copper pads. |
| ID (Reverse Leakage) | ≤1.0 μA at 24 V - Minimal standby current draw; critical for low-power sensor and battery-backed circuits. |
| TJ max. | +150 °C - Maximum junction temperature rating enabling operation in under-hood automotive environments. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test requirements including HTOL, TC, HTRB, and UHAST. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical PN junction; accepts surge current from either direction during overvoltage events. |
| Cathode | Transient current exit (bidirectional) | Second terminal of symmetrical PN junction; completes low-impedance path to ground or rail during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| AEC-Q101 qualification | Validates reliability for automotive powertrain, body control, and ADAS modules requiring long-term field stability. |
| 400 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out with adequate PCB copper area. |
| MSL Level 1 (260 °C peak) | Permits standard lead-free reflow without baking or special handling; reduces manufacturing overhead. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes voltage overshoot during transients, protecting 3.3 V/5 V/24 V logic and analog front-ends. |
Applications
| Automotive Sensor Interface | Industrial PLC Input Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across signal line and ground to limit transient excursions below IC absolute maximum ratings. Use Value: Prevents latch-up or permanent damage to 24 V-rated interface ICs during ISO 16750-2 pulses up to 100 V/100 ms. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to inductive switching noise from solenoids and contactors. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing repetitive 400 W surges induced by 24 V DC coil de-energization. Use Value: Extends mean time between failures (MTBF) of input optocouplers and Schmitt triggers in harsh factory environments. |
| Consumer Appliance Motor Control | Telecom Power Rail Protection |
|
Use Scenario: Clamping flyback spikes on half-bridge gate drivers and microcontroller I/O pins in smart home appliance motor inverters. IC Role / Device Role / Timing Role: Fast-response shunt device limiting voltage overshoot during MOSFET turn-off to <40 V, preserving gate oxide integrity. Use Value: Eliminates need for snubbers or RC networks, reducing BOM count and board space in compact BLDC controller designs. |
Use Scenario: Guarding 24 V/48 V telecom power distribution rails against lightning-induced surges entering via Ethernet or external power feeds. IC Role / Device Role / Timing Role: Primary-stage TVS suppressing common-mode transients before they reach DC/DC converters and PMICs. Use Value: Maintains system uptime by preventing brownouts or resets caused by >1 kV surges compliant with ITU-T K.20/21 standards. |
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 | Halogen-free, RoHS-compliant, same electrical specs and AEC-Q101 qualification; differs only in material composition and packaging format (13" reel). | Identical functional use; selected where halogen-free compliance is mandated by end-equipment environmental policy. | Choose SMAJ24CAHE3_A/I for standard RoHS compliance; select SMAJ24CA-M3/5A if halogen-free materials are required. |
| SMBJ24CAHE3_A/I | Same VWM/VC/IPPM specs but in larger SMB (DO-214AA) package; higher thermal mass (RθJA = 80 °C/W) and 600 W PPPM rating. | Better suited for higher-energy surge environments (e.g., outdoor telecom cabinets), but requires larger PCB footprint. | Use SMAJ24CAHE3_A/I where space-constrained layouts dominate; upgrade to SMBJ24CAHE3_A/I only when >400 W surge margin is needed. |
Compared with SMAJ24CA-M3/5A, the SMAJ24CAHE3_A/I offers identical protection performance with standard RoHS compliance, while SMBJ24CAHE3_A/I provides higher surge headroom at the cost of increased board area - making SMAJ24CAHE3_A/I optimal for cost- and space-sensitive automotive and industrial SMT designs.
Availability
SMAJ24CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC input hardening, and consumer appliance motor control requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ24CAHE3_A/I 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 was developed for high-reliability transient suppression in automotive, industrial, and telecom systems - prioritizing fast response, low clamping, and AEC-Q101 qualification in compact surface-mount packages.
FAQ
What is the clamping voltage of the SMAJ24CAHE3_A/I under a 10/1000 μs surge?
The SMAJ24CAHE3_A/I has a maximum clamping voltage (VC) of 38.9 V at 10.3 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per JEDEC standards on specified 5.0 mm × 5.0 mm copper pads and ensures protected circuits remain within safe voltage limits during standardized surge events. The SMAJ24CAHE3_A/I maintains this clamping performance across its qualified temperature range (-55 °C to +150 °C).
Is the SMAJ24CAHE3_A/I suitable for automotive applications?
Yes, the SMAJ24CAHE3_A/I is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, body electronics, and ADAS sensors. Its bidirectional architecture, 150 °C junction rating, and validation across HTOL, temperature cycling, and humidity testing confirm suitability for under-hood and cabin environments. The SMAJ24CAHE3_A/I appears in Vishay's automotive ordering code list with HE3 suffix denoting this qualification.
How does the SMAJ24CAHE3_A/I differ from unidirectional SMAJ24A variants?
The SMAJ24CAHE3_A/I is bidirectional, meaning it clamps voltage transients equally in both directions with no cathode marking, whereas unidirectional SMAJ24A types have a defined cathode band and conduct only in reverse bias. This makes the SMAJ24CAHE3_A/I ideal for AC-coupled or floating lines like differential buses or transformer-isolated interfaces, while SMAJ24A suits DC rails where polarity is fixed and forward conduction must be blocked.
What is the maximum reverse leakage current for the SMAJ24CAHE3_A/I at its stand-off voltage?
The SMAJ24CAHE3_A/I exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 24 V stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor paths and minimizes standby power loss in battery-operated systems. The SMAJ24CAHE3_A/I maintains ID ≤ 5.0 μA across its full operating temperature range per specification table notes.
Does the SMAJ24CAHE3_A/I require special PCB layout considerations?
Yes - optimal performance of the SMAJ24CAHE3_A/I requires mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W peak pulse power. Short, wide traces to ground or return planes reduce inductance and preserve clamping speed. The SMAJ24CAHE3_A/I should be placed as close as possible to the protected port, with no series resistance or ferrite beads between it and the vulnerable node.
SMAJ24CAHE3_A/I 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/I FAQ
1.How can I place an order for SMAJ24CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24CAHE3_A/I 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/I reliable?
The price and inventory of SMAJ24CAHE3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SMAJ24CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24CAHE3_A/I?
SMAJ24CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24CAHE3_A/I 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/I?
For technical support, including SMAJ24CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ24CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ24CAHE3_A/I 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/I meets industry standards.
7.What is the process for return or replacement of SMAJ24CAHE3_A/I?
All SMAJ24CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24CAHE3_A/I, 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/I part is unused and in its original packaging.
Return procedure for SMAJ24CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ24CAHE3_A/I Tags
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