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Vishay General Semiconductor - Diodes Division SMAJ24CAHM3/H
- Part No.:
- SMAJ24CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24CAHM3/H.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,749
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Product details
Overview
SMAJ24CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal 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 (10/1000 μs waveform), making it suitable for protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ24CAHM3/H datasheet, SMAJ24CAHM3/H pinout, SMAJ24CAHM3/H application, or SMAJ24CAHM3/H equivalent, key selection criteria include bidirectional surge capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with 0.2" × 0.2" copper pad layouts per JEDEC DO-214AC thermal guidelines.
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 ps) to ESD and lightning-induced transients, while low incremental surge resistance ensures stable clamping under repetitive 0.01% duty cycle pulses.
The SMAJ24CAHM3/H is rated for -55 °C to +150 °C operating junction temperature, exhibits 0.096 %/°C temperature coefficient of VBR, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak, supporting high-reliability automated SMT assembly in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 24 V - Maximum continuous reverse voltage before clamping begins; defines safe operating margin below circuit rail voltage. |
| VBR (Breakdown Voltage) | 26.7–29.5 V at 1 mA - Confirmed minimum/maximum threshold where avalanche conduction initiates reliably. |
| VC (Clamping Voltage) | 38.9 V at 10.3 A IPPM - Peak voltage seen by protected circuit during 10/1000 μs surge; critical for IC-level overvoltage margining. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capacity with standard 10/1000 μs waveform; determines survivability against load-switching spikes. |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms); validates robustness against inrush or fault currents in power rails. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" pads; informs PCB copper area requirements for thermal management. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H), matte tin-plated leads, compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Either terminal accepts surge current; symmetric structure eliminates orientation dependency during layout. |
| Cathode | Transient current entry (bidirectional) | Functionally identical to Anode; no cathode band marking distinguishes bidirectional variants like SMAJ24CAHM3/H. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, and ESD; supports under-hood and ADAS applications. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-20; eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating. |
| 400 W peak pulse power | Handles 10/1000 μs surges up to 400 W on circuits ≤78 V; exceeds IEC 61000-4-5 Level 4 immunity requirements. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage stress on downstream components; improves margin for 24 V nominal systems with ±10% tolerance. |
| MSL Level 1 moisture sensitivity | Unlimited floor life at ≤30 °C/60% RH; eliminates bake-out prior to reflow, reducing manufacturing cost and risk of PCB warpage. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppresses load-dump transients (up to 120 V, 400 ms) and alternator ripple on 24 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed across VBAT and GND, upstream of DC-DC converters and microcontrollers. Use Value: Limits voltage excursion to ≤38.9 V during 10.3 A surge, preventing latch-up or gate oxide damage in 3.3 V/5 V logic and CAN transceivers. | Use Scenario: Shields analog and digital signal lines (e.g., RS-485, LIN, thermistor inputs) from ESD and inductive kickback in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF at 0 V) bidirectional clamp mounted directly at connector entry points. Use Value: Maintains signal integrity with <1 ns response time while surviving ±15 kV contact ESD (IEC 61000-4-2) without degradation. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive Protection |
Use Scenario: Protects AC-DC adapter primary-side rectifiers and secondary-side 24 V distribution rails from lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Front-end TVS on 24 V output rail, coordinated with MOVs and fuses for staged protection architecture. Use Value: Delivers 400 W pulse handling with 30 Ω typical dynamic impedance, enabling predictable let-through energy to downstream TVS arrays. | Use Scenario: Guards H-bridge gate drivers and current-sense amplifiers against back-EMF spikes generated by brushed DC motors in HVAC and white goods. IC Role / Device Role / Timing Role: Localized clamp across motor winding terminals and driver supply pins, minimizing trace inductance path. Use Value: Clamps 24 V rail transients to 38.9 V within nanoseconds, preventing false triggering of overvoltage protection and MOSFET avalanche failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CAHE3/H | Same electrical specs, RoHS-compliant but not halogen-free; uses standard SnPb-free matte tin plating without brominated FR additives. | Lacks halogen-free certification; acceptable for commercial/industrial use but excluded from automotive Tier 1 BOMs requiring full material declarations. | Select when halogen-free compliance is not mandated and cost sensitivity outweighs material traceability requirements. |
| SMBJ24CAHM3 | Higher PPPM (600 W), larger SMB (DO-214AA) package; same VWM/VC but 15.4 A IPPM; RθJA = 80 °C/W. | Requires larger PCB footprint and higher copper mass; better suited for high-energy industrial mains protection than space-constrained automotive modules. | Choose when surge energy exceeds 400 W or thermal budget demands lower junction rise per watt. |
Compared with SMAJ24CAHE3/H, the SMAJ24CAHM3/H adds halogen-free compliance for automotive supply chains, while SMBJ24CAHM3 trades compact size for higher surge capacity and improved thermal performance-enabling design flexibility across cost, space, and energy-handling priorities.
Availability
SMAJ24CAHM3/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, telecom power supplies, and consumer appliance motor controls requiring stable component supply with AEC-Q101 validation and halogen-free material compliance.
Supply support for SMAJ24CAHM3/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, automotive qualification, and high-volume manufacturability.
The SMAJ series is engineered specifically for board-level transient suppression in automotive, industrial, and telecom systems where compact size, AEC-Q101 compliance, and repeatable clamping performance are mandatory.
FAQ
What does the 'HM3' suffix indicate in SMAJ24CAHM3/H?
The 'HM3' suffix in SMAJ24CAHM3/H denotes halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. It also signifies qualification to AEC-Q101 for automotive applications, distinguishing it from commercial-grade 'E3' or non-halogen-free 'HE3' variants. This makes SMAJ24CAHM3/H suitable for Tier 1 automotive BOMs requiring full material compliance documentation.
Is SMAJ24CAHM3/H unidirectional or bidirectional, and how is polarity identified?
SMAJ24CAHM3/H is a bidirectional TVS diode, indicated by the 'CA' suffix. Unlike unidirectional versions (e.g., SMAJ24A), it has no cathode band marking and conducts identically in both directions. This symmetry allows placement without orientation concerns on differential or AC-coupled lines, simplifying layout and reducing assembly errors compared to polarity-sensitive variants.
What is the maximum clamping voltage of SMAJ24CAHM3/H, and under what test condition is it specified?
The maximum clamping voltage of SMAJ24CAHM3/H is 38.9 V, measured at a peak pulse current (IPPM) of 10.3 A using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range (-55 °C to +150 °C) and defines the worst-case overvoltage imposed on protected circuitry during surge events.
Can SMAJ24CAHM3/H be used in place of SMAJ24A in an existing design?
No-SMAJ24CAHM3/H is bidirectional while SMAJ24A is unidirectional, meaning they differ fundamentally in conduction behavior. Substituting SMAJ24CAHM3/H for SMAJ24A may cause unintended forward conduction on DC-biased lines. The SMAJ24CAHM3/H requires verification of system-level polarity, grounding scheme, and transient directionality before replacement; it is not a drop-in functional substitute.
Does SMAJ24CAHM3/H meet any specific automotive qualification standards?
Yes, SMAJ24CAHM3/H is AEC-Q101 qualified, having passed stress tests including high-temperature operating life (HTOL), temperature cycling (TC), and electrostatic discharge (ESD) per JS-001. This qualification confirms suitability for automotive applications such as body electronics, infotainment power supplies, and ADAS sensor interfaces where long-term reliability under thermal and electrical stress is required.
SMAJ24CAHM3/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:
- 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:
- 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/H FAQ
1.How can I place an order for SMAJ24CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24CAHM3/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 SMAJ24CAHM3/H reliable?
The price and inventory of SMAJ24CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ24CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24CAHM3/H?
SMAJ24CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24CAHM3/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 SMAJ24CAHM3/H?
For technical support, including SMAJ24CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24CAHM3/H requirements.
6.How does Aetrix verify that SMAJ24CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ24CAHM3/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 SMAJ24CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ24CAHM3/H?
All SMAJ24CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24CAHM3/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 SMAJ24CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ24CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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