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Vishay General Semiconductor - Diodes Division SMAJ24CAHM3_A/H
- Part No.:
- SMAJ24CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24CAHM3_A/H.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,263
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Product details
Overview
SMAJ24CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 24 V standoff voltage (VWM), 26.7–29.5 V breakdown voltage (VBR) at 1 mA, 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), commonly deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ24CAHM3_A/H datasheet, SMAJ24CAHM3_A/H pinout, SMAJ24CAHM3_A/H application, or SMAJ24CAHM3_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 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector: under normal conditions it presents high impedance (>1 MΩ leakage at VWM), but switches to low-impedance conduction within <1 ns when transients exceed VBR, diverting surge current away from downstream ICs. Its bidirectional architecture ensures symmetric clamping in both polarities without polarity marking.
Rated for 400 W peak pulse power (10/1000 μs) up to 78 V and 300 W above that threshold, it sustains repetitive surges at 0.01 % duty cycle. Thermal performance is defined by RθJA = 120 °C/W and RθJL = 30 °C/W, with maximum junction temperature of +150 °C and storage range from –55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 24 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 26.7–29.5 V at 1 mA - Confirmed minimum/maximum voltage at which device enters avalanche conduction; ensures predictable turn-on threshold. |
| VC (Clamping Voltage) | 38.9 V at IPPM = 10.3 A - Peak voltage seen across protected circuit during worst-case 10/1000 μs surge; critical for IC-level voltage tolerance compliance. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capability per 10/1000 μs waveform; determines survivability against lightning or inductive switch-off transients. |
| ID (Reverse Leakage) | 1.0 μA max at VWM - Low leakage preserves signal integrity and minimizes standby power loss in battery-powered systems. |
| TJ max. | +150 °C - Enables operation in under-hood automotive environments and high-temperature industrial enclosures. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 standards. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C reflow peak), matte tin-plated leads solderable per J-STD-002/JESD22-B102. No polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; symmetrical with cathode in bidirectional mode | Enables clamping during positive- and negative-going transients without external polarity orientation. |
| Cathode | Current exit terminal in forward bias; symmetrical with anode in bidirectional mode | Provides identical clamping behavior for both voltage polarities-no circuit layout dependency on marking. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions eliminates need for polarity-aware PCB layout or discrete dual-diode solutions. |
| 400 W peak pulse power (≤78 V) | Withstands high-energy transients from load dump or relay coil de-energization in 12 V/24 V automotive systems. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive electronics per stress test requirements, enabling use in engine control, ADAS, and body modules. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response), improving protection margin for sub-5 V logic ICs. |
| MSL Level 1 rating | Supports standard SMT reflow profiles without moisture sensitivity concerns-no baking required prior to assembly. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs in engine control units against ISO 7637-2 pulse 1 (inductive switch-off) and pulse 3a/b (load dump). IC Role / Device Role / Timing Role: Voltage-clamping TVS diode placed directly at connector entry point to shunt surge energy before reaching DC-DC converters and microcontrollers. Use Value: Clamps transients to ≤38.9 V, ensuring downstream 40 V-rated regulators and 3.3 V/5 V logic remain within absolute maximum ratings. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation equipment from ESD and cable-induced surges. IC Role / Device Role / Timing Role: Bidirectional transient suppressor mounted adjacent to connector to absorb ±8 kV contact ESD (IEC 61000-4-2) and 1 kV ring wave (IEC 61000-4-12). Use Value: Sub-1 ns response and symmetric clamping preserve signal fidelity while preventing latch-up or gate oxide damage in op-amps and ADC drivers. |
| Telecom Interface Protection | Consumer Device USB Port Protection |
Use Scenario: Safeguarding RS-485 transceivers in base station backhaul links exposed to induced lightning surges on long outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on differential bus lines (A/B), coordinated with secondary GDT or polymer PTC for staged protection. Use Value: 400 W pulse rating handles multi-kA induced currents; 24 V VWM aligns with common RS-485 common-mode range limits. |
Use Scenario: Adding robustness to USB 2.0 data lines (D+/D−) in portable medical monitors subjected to frequent ESD events in clinical environments. IC Role / Device Role / Timing Role: Bidirectional TVS placed inline with data traces to clamp ±15 kV air discharge transients before reaching USB PHY ICs. Use Value: 1.0 μA leakage at 24 V VWM avoids signal attenuation; low capacitance (<100 pF typical) maintains USB 2.0 eye diagram integrity. |
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/H | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant with lead-free (non-halogen-free) terminations. | Preferred for commercial/industrial designs where halogen-free requirement is not mandated. | Select SMAJ24CAHE3_A/H if halogen-free material categorization is not required and cost optimization is prioritized. |
| SMBJ24CAHM3_A/H | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - larger footprint (4.58 mm × 3.94 mm vs. 4.50 mm × 2.79 mm) and higher PPPM (600 W). | Better suited for higher-energy surge environments where board space allows and thermal mass improves derating. | Choose SMBJ24CAHM3_A/H when 600 W surge handling is needed and PCB real estate permits larger package. |
Compared with SMAJ24CAHE3_A/H, the SMAJ24CAHM3_A/H offers halogen-free construction for stricter environmental compliance; versus SMBJ24CAHM3_A/H, it trades 200 W lower peak power for 30 % smaller PCB area and compatible reflow profile.
Availability
SMAJ24CAHM3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom infrastructure equipment, and consumer USB peripheral protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ24CAHM3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMAJ series targets high-reliability transient suppression in automotive, industrial, and communications systems, engineered for rapid response, repeatable clamping, and seamless integration into automated SMT manufacturing flows.
FAQ
What is the clamping voltage of the SMAJ24CAHM3_A/H under a 10/1000 μs surge?
The SMAJ24CAHM3_A/H exhibits a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current of 10.3 A under the standardized 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees the protected circuit sees no more than 38.9 V during such transients. The SMAJ24CAHM3_A/H achieves this with low incremental surge resistance, minimizing overshoot beyond VC.
Is the SMAJ24CAHM3_A/H suitable for automotive applications?
Yes, the SMAJ24CAHM3_A/H is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control, body electronics, and ADAS subsystems. Its halogen-free, RoHS-compliant construction (HM3 suffix), MSL Level 1 rating, and guaranteed operation from –55 °C to +150 °C meet stringent automotive reliability and manufacturability requirements. The SMAJ24CAHM3_A/H is explicitly listed in Vishay's AEC-Q101 qualified product matrix.
How does the bidirectional design of the SMAJ24CAHM3_A/H affect PCB layout?
The SMAJ24CAHM3_A/H has no polarity marking and delivers identical clamping characteristics in both directions, eliminating the need to orient the device during placement. This simplifies PCB layout, reduces assembly errors, and avoids the need for dual unidirectional diodes or external bridging. Engineers can route the SMAJ24CAHM3_A/H symmetrically across any two-node interface-power rail, data line, or sensor output-without concern for anode/cathode alignment.
What is the thermal resistance of the SMAJ24CAHM3_A/H, and how does it impact power dissipation?
The SMAJ24CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W. At ambient temperatures above 25 °C, its 3.3 W steady-state power dissipation (PD) must be derated linearly per the datasheet curve. These values inform heatsinking decisions and define safe operating area limits during repetitive surge events-critical for sustained reliability in enclosed industrial enclosures.
Does the SMAJ24CAHM3_A/H meet industry-standard ESD and surge immunity requirements?
Yes, the SMAJ24CAHM3_A/H is designed to meet IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) immunity requirements when properly implemented with appropriate PCB layout (e.g., short traces, ground plane coupling). Its 400 W peak pulse power rating corresponds to robust surge handling, and its <1 ns response time ensures effective clamping before system-level protection thresholds are exceeded. The SMAJ24CAHM3_A/H is widely used in designs certified to these standards.
SMAJ24CAHM3_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:
- 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/H FAQ
1.How can I place an order for SMAJ24CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24CAHM3_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 SMAJ24CAHM3_A/H reliable?
The price and inventory of SMAJ24CAHM3_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 SMAJ24CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ24CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24CAHM3_A/H?
SMAJ24CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24CAHM3_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 SMAJ24CAHM3_A/H?
For technical support, including SMAJ24CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ24CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ24CAHM3_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 SMAJ24CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ24CAHM3_A/H?
All SMAJ24CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24CAHM3_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 SMAJ24CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ24CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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