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Vishay General Semiconductor - Diodes Division SMAJ24CAHM3_A/I
- Part No.:
- SMAJ24CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24CAHM3_A/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,070
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Product details
Overview
SMAJ24CAHM3_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 power and signal 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 (PPPM) with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ24CAHM3_A/I datasheet, SMAJ24CAHM3_A/I pinout, SMAJ24CAHM3_A/I application, or SMAJ24CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, and compatibility with automated SMT placement on 0.2" × 0.2" 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 (<1 ns) to ESD and lightning-induced surges, while low incremental surge resistance ensures stable clamping under repetitive transient events.
The SMAJ24CAHM3_A/I is rated for -55 °C to +150 °C operating junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its thermal resistance (RθJA = 120 °C/W) and 3.3 W steady-state power dissipation support reliable operation without heatsinking in standard PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 26.7 V / 29.5 V at 1 mA - verified breakdown threshold range ensuring consistent turn-on behavior |
| VC @ IPPM | 38.9 V at 10.3 A - clamping voltage under standardized 10/1000 μs surge, limiting downstream stress |
| PPPM | 400 W - peak pulse power handling capacity for transient suppression without failure |
| ID @ VWM | 1.0 μA - ultra-low leakage current preserving signal integrity and power efficiency |
| TJ max | +150 °C - extended junction temperature rating enabling use in under-hood automotive environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 0.208" x 0.157" footprint and matte tin leads |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with glass-passivated chip junction, matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bidirectional configuration has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry path (bidirectional) | Accepts surge current from either direction; connects to protected line |
| Cathode | Transient current return path (bidirectional) | Completes clamping loop to ground or reference rail; symmetric with anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with environmental regulations and end-of-life processing requirements |
| 400 W peak pulse power | Handles high-energy transients from inductive load switching without degradation over 0.01% duty cycle |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage exposure to downstream components during surge events |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking; supports standard reflow profiles up to 260 °C peak |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply rails in body control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Voltage clamping element placed between power input and DC-DC converter input stage. Use Value: Limits transient excursions to ≤38.9 V, preventing latch-up or damage to downstream regulators and microcontrollers. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in PLC I/O modules from EFT and surge coupling. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential or single-ended signal traces. Use Value: Maintains signal fidelity by clamping sub-100 ns ESD events below 40 V while adding <1 pF capacitance. |
| Telecom Equipment Surge Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Safeguarding Ethernet PHY power pins and bias rails in PoE-powered switches against lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on 3.3 V/5 V auxiliary rails feeding communication ICs. Use Value: Withstands 10/1000 μs surges up to 400 W without degradation, meeting IEC 61000-4-5 Level 3 requirements. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in washing machine control boards. IC Role / Device Role / Timing Role: Clamp device across motor terminals or H-bridge outputs. Use Value: Absorbs 40 A non-repetitive forward surge (IFSM) and limits flyback voltage to safe levels for MOSFET gate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CAHE3_A/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial-grade industrial equipment where automotive qualification is unnecessary | Select when halogen-free requirement or automotive qualification is not mandated |
| SMBJ24CAHM3_A/I | Same VWM/VC/PPPM but in larger SMB (DO-214AA) package; higher RθJA (90 °C/W vs. 120 °C/W) | Better surge energy handling margin due to larger thermal mass; requires more PCB area | Choose when higher reliability margin is needed and board space permits larger footprint |
Compared with SMAJ24CAHM3_A/I, SMAJ24CAHE3_A/I offers identical protection performance without halogen-free or automotive qualification, while SMBJ24CAHM3_A/I provides enhanced thermal robustness in a larger package - enabling trade-offs between board density, qualification needs, and long-term surge endurance.
Availability
SMAJ24CAHM3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and consumer appliance motor controls requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ24CAHM3_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, MOSFETs, and protection devices with emphasis on reliability and application-specific validation.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where AEC-Q101 qualification, low clamping voltage, and automated assembly compatibility are critical.
FAQ
What does the 'HM3' suffix indicate in SMAJ24CAHM3_A/I?
The HM3 suffix in SMAJ24CAHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with automotive reliability standards, absence of brominated flame retardants, and suitability for high-reliability applications such as engine control and ADAS subsystems - all verified per Vishay's qualification test reports.
Is SMAJ24CAHM3_A/I unidirectional or bidirectional?
SMAJ24CAHM3_A/I is a bidirectional TVS diode, as indicated by the 'CA' suffix. It provides symmetrical clamping in both polarities, making it ideal for AC-coupled signal lines, differential buses, or any application where voltage transients may occur with either polarity relative to ground - unlike unidirectional variants ending in 'A'.
What is the maximum clamping voltage of SMAJ24CAHM3_A/I under surge conditions?
The maximum clamping voltage (VC) of SMAJ24CAHM3_A/I is 38.9 V at 10.3 A peak pulse current (IPPM), measured with a 10/1000 μs waveform. This value is guaranteed across temperature and lifetime, ensuring downstream ICs and MOSFETs remain within safe operating voltage limits during transient events.
Can SMAJ24CAHM3_A/I be used in place of SMAJ24A?
No - SMAJ24CAHM3_A/I is bidirectional while SMAJ24A is unidirectional. Substituting them requires circuit review: SMAJ24A has cathode marking and conducts forward current, whereas SMAJ24CAHM3_A/I has no polarity marking and clamps equally in both directions. Using SMAJ24A in a bidirectional design risks failure during negative transients.
What PCB pad layout is recommended for optimal thermal performance of SMAJ24CAHM3_A/I?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad per terminal for SMAJ24CAHM3_A/I to achieve rated 400 W peak pulse power. Smaller pads reduce thermal dissipation, derating PPPM and increasing junction temperature - potentially triggering premature failure during repetitive surges.
SMAJ24CAHM3_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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ24CAHM3_A/I FAQ
1.How can I place an order for SMAJ24CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24CAHM3_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 SMAJ24CAHM3_A/I reliable?
The price and inventory of SMAJ24CAHM3_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 SMAJ24CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ24CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24CAHM3_A/I?
SMAJ24CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24CAHM3_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 SMAJ24CAHM3_A/I?
For technical support, including SMAJ24CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ24CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ24CAHM3_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 SMAJ24CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ24CAHM3_A/I?
All SMAJ24CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24CAHM3_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 SMAJ24CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ24CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ24CAHM3_A/I Tags
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