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Vishay General Semiconductor - Diodes Division SMAJ24AHM3/I
- Part No.:
- SMAJ24AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24AHM3/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,090
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Product details
Overview
SMAJ24AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 24 V stand-off 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, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive ECUs, industrial sensor interfaces, and 24 V PLC I/O modules.
For engineers reviewing the SMAJ24AHM3/I datasheet, SMAJ24AHM3/I pinout, SMAJ24AHM3/I application, or SMAJ24AHM3/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance data (RθJA = 120 °C/W), and precise mounting pad layout guidance per JEDEC DO-214AC standard - critical for surge immunity validation and board-level ESD/transient design.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: under normal bias it presents <1 μA reverse leakage at 24 V, then rapidly avalanches when transient voltage exceeds VBR (min 26.7 V), limiting downstream voltage to ≤38.9 V at 10.3 A. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
Rated for -55 °C to +150 °C operating junction temperature, it meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), uses matte tin-plated leads compliant with J-STD-002, and is halogen-free and RoHS-compliant per Vishay HM3 suffix designation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating rail for 24 V systems. |
| VBR (min/max) | 26.7 V / 29.5 V at 1 mA - Confirmed avalanche initiation range; ensures reliable turn-on above nominal rail. |
| VC @ IPPM | 38.9 V at 10.3 A - Clamped voltage during 400 W 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 μs waveform; validates immunity to IEC 61000-4-5 Level 4 surges. |
| IFSM | 40 A - Non-repetitive forward surge current (8.3 ms half-sine); supports inrush or fault-current events in power rails. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on 0.2" × 0.2" copper pads; informs derating above 25 °C ambient. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with cathode band marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); conforms to JEDEC outline DO-214AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential node; conducts during positive transients when used in reverse-biased protection configuration. |
| Cathode | Reverse-bias input terminal | Connected to protected line (e.g., 24 V rail); avalanche conduction initiates here when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental compliance mandates without compromising surge performance or thermal stability. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Combination Wave (1.2/50 μs voltage + 8/20 μs current) surges up to Level 4 (4 kV/2 kA) on properly laid out PCBs. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot during clamping - critical for protecting 3.3 V or 5 V logic behind level-shifting interfaces powered from 24 V rails. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with high-volume automated assembly lines using peak 260 °C profiles. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs of engine control units (ECUs) against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between 24 V rail and chassis ground, clamping surges within nanoseconds. Use Value: Limits voltage to ≤38.9 V during 10.3 A transients, preventing damage to downstream DC-DC converters and microcontrollers rated for 40 V absolute max. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) of pressure/temperature sensors in factory automation panels. IC Role / Device Role / Timing Role: Bidirectional-capable but used unidirectionally across signal and return paths to absorb ESD and inductive kickback from solenoid drivers. Use Value: Sub-100 ns response time and <1 μA leakage at 24 V ensure no signal distortion during normal operation while blocking ±30 kV contact ESD per IEC 61000-4-2. |
| PLC Digital I/O Protection | Telecom Power Interface Protection |
|
Use Scenario: Shielding dry-contact digital inputs on programmable logic controllers from field-wiring induced surges and ground loop transients. IC Role / Device Role / Timing Role: Mounted directly at connector entry point, referenced to common-mode ground, absorbing common-mode surges before they reach optocoupler inputs. Use Value: 400 W rating and 120 °C/W RθJA allow sustained operation in 70 °C cabinet environments without thermal runaway during repeated surge events. |
Use Scenario: Front-end protection of 24 V DC power inputs in remote radio head (RRH) base station equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: First-stage clamping device upstream of DC-DC regulators and PMICs, reducing stress on secondary protection stages. Use Value: AEC-Q101 qualification and -55 °C to +150 °C TJ range ensure reliability in outdoor telecom cabinets subject to wide thermal cycling and humidity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24AHE3/I | Same electrical specs (VWM, VBR, VC, PPPM), but RoHS-compliant commercial grade (E3) without halogen-free certification. | Lacks halogen-free material declaration; acceptable for non-automotive industrial use where halogen restrictions do not apply. | Select SMAJ24AHM3/I when compliance with IPC-1752A halogen-free reporting or automotive Tier 1 sourcing requirements is mandatory. |
| SMAJ24A-M3/61 | Identical HM3 specification and packaging; differs only in tape-and-reel delivery format (61 = 7" reel, 1800 pcs vs. I = 13" reel, 7500 pcs). | No functional or electrical difference; purely logistics-driven variant for high-volume SMT line feed optimization. | Choose SMAJ24AHM3/I for large-batch production requiring extended reel length and reduced changeover frequency. |
Compared with SMAJ24AHE3/I, SMAJ24AHM3/I adds halogen-free assurance without sacrificing surge capability; versus SMAJ24A-M3/61, it specifies the same HM3 material grade but with distinct reel packaging code (I), enabling traceability and volume procurement alignment for OEM programs.
Availability
SMAJ24AHM3/I is available at Aetrix Electronics and suitable for automotive ECU designs, industrial PLC I/O modules, and telecom power interface protection requiring stable component supply, AEC-Q101 qualification, and halogen-free compliance.
Supply support for SMAJ24AHM3/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, efficiency, and application-specific performance.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated.
FAQ
What is the clamping voltage of SMAJ24AHM3/I at its rated peak pulse current?
The SMAJ24AHM3/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 standard test conditions in the Vishay datasheet (Document Number: 88390) and defines the upper voltage limit imposed on protected circuits during surge events. The SMAJ24AHM3/I maintains this clamping performance across its full operating temperature range.
Is SMAJ24AHM3/I qualified for automotive applications?
Yes, SMAJ24AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in the SMAJ5.0A–SMAJ188CA datasheet. This qualification covers stress tests including temperature cycling, high-temperature operating life, and mechanical shock - making SMAJ24AHM3/I suitable for under-hood and chassis-mounted automotive electronics such as body control modules and ADAS power supplies.
What does the "HM3" suffix mean in SMAJ24AHM3/I?
The "HM3" suffix in SMAJ24AHM3/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering nomenclature, "H" denotes AEC-Q101 qualification, "M3" specifies halogen-free and RoHS-compliant materials, and "I" identifies the 13-inch tape-and-reel packaging format (7500 pieces per reel). This distinguishes SMAJ24AHM3/I from commercial-grade E3 variants and non-halogen-free alternatives.
Can SMAJ24AHM3/I be used in bidirectional configurations?
No - SMAJ24AHM3/I is a unidirectional TVS diode, identified by the "A" (not "CA") suffix and cathode band marking. Bidirectional operation requires the "CA" variant (e.g., SMAJ24CA). Using SMAJ24AHM3/I in reverse-biased AC signal paths would result in forward conduction during negative half-cycles, causing failure. Always match device polarity to circuit topology: SMAJ24AHM3/I protects DC rails with defined ground reference.
What is the thermal resistance of SMAJ24AHM3/I, and how does it affect layout?
SMAJ24AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per DO-214AC standards. To maintain reliability under repetitive surges, PCB layout must provide adequate copper area and avoid thermal bottlenecks - insufficient copper increases junction temperature, derating peak power and accelerating degradation.
SMAJ24AHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ24AHM3/I FAQ
1.How can I place an order for SMAJ24AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24AHM3/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 SMAJ24AHM3/I reliable?
The price and inventory of SMAJ24AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24AHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ24AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24AHM3/I?
SMAJ24AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24AHM3/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 SMAJ24AHM3/I?
For technical support, including SMAJ24AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24AHM3/I requirements.
6.How does Aetrix verify that SMAJ24AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ24AHM3/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 SMAJ24AHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ24AHM3/I?
All SMAJ24AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24AHM3/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 SMAJ24AHM3/I part is unused and in its original packaging.
Return procedure for SMAJ24AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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