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Vishay General Semiconductor - Diodes Division SMAJ24AHM3_A/H
- Part No.:
- SMAJ24AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24AHM3_A/H.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,080
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Product details
Overview
SMAJ24AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount 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), 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 - suitable for protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ24AHM3_A/H datasheet, SMAJ24AHM3_A/H pinout, SMAJ24AHM3_A/H application, or SMAJ24AHM3_A/H equivalent, this device delivers verified AEC-Q101 qualification, halogen-free RoHS compliance, MSL Level 1 moisture sensitivity, and low incremental surge resistance - critical for high-reliability transient suppression in constrained PCB layouts.
Technical Context
The SMAJ24AHM3_A/H operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response time and stable clamping under repetitive surge conditions. Its thermal design relies on RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, enabling reliable operation up to TJ = +150 °C.
It complies with ANSI/IEEE C62.35 for transient suppressor definitions and supports automated SMT placement with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. The cathode band marking identifies polarity, and its 1.0 μA max reverse leakage at VWM ensures minimal standby power loss in protected circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for 24 V nominal systems. |
| VBR (min/max) | 26.7 V / 29.5 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 38.9 V at 10.3 A - Clamped voltage during 10/1000 μs surge; limits downstream stress to ≤39 V under worst-case 400 W transient. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; rated for 0.01% duty cycle. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports inrush and fault-current robustness in DC power paths. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial ambient environments. |
| Package | SMA (DO-214AC) - Standardized 2-pin surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with JEDEC MS-013. |
Pinout & Package
Package: SMA (DO-214AC), molded epoxy case with matte tin-plated leads; cathode identified by a visible band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to system ground or low-side return path. | Provides low-impedance path for surge current to ground when VAK exceeds VBR; must be routed with minimal inductance to preserve clamping speed. |
| Cathode | Current exit terminal in forward bias; marked with band; connects to protected line (e.g., 24 V rail). | Defines polarity-sensitive protection direction; reverse connection would disable clamping function and risk device failure. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, body electronics, and ADAS power rails. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-020 MSL Level 1 - eliminates brominated flame retardants and supports lead-free reflow profiles up to 260 °C peak. |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VWM ≈ 1.62) | Minimizes overvoltage exposure to downstream ICs - e.g., keeps 24 V microcontroller I/O within safe absolute maximum ratings during load dump. |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term parameter stability across temperature and lifetime; reduces parameter drift vs. epoxy-passivated alternatives. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (up to 60 V, 100 ms) on 24 V battery-fed ECUs in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V supply and ground, clamping surges before they reach PMIC input stages. Use Value: Limits peak voltage to ≤38.9 V during 10.3 A surge, preventing latch-up or gate oxide damage in buck converters and CAN transceivers. |
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) from ESD and inductive switching noise in factory automation PLC modules. IC Role / Device Role / Timing Role: Mounted at connector entry point to shunt fast transients (<1 ns rise time) directly to chassis ground. Use Value: Sub-ns response and 1.0 μA leakage preserve signal integrity and measurement accuracy while surviving ±8 kV contact ESD per IEC 61000-4-2. |
| DC Motor Drive Gate Protection | Telecom Power Input Stage |
|
Use Scenario: Shielding N-channel MOSFET gates from flyback spikes generated by brushed DC motor commutation in power tools. IC Role / Device Role / Timing Role: Connected between gate and source (with series resistor), clamping negative-going spikes below -20 V. Use Value: 24 V VWM allows normal 0–15 V gate drive swing while blocking destructive negative transients exceeding VBR = 26.7 V. |
Use Scenario: Safeguarding primary-side rectifier and controller ICs in 48 V telecom power supplies exposed to lightning-induced surges on AC input lines. IC Role / Device Role / Timing Role: Used in secondary-side DC bus (e.g., +48 V output) as backup clamp alongside MOVs and fuses. Use Value: 400 W rating and 38.9 V clamping enable coordination with upstream overvoltage protection to hold downstream DC-DC converters within safe operating area. |
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_A/H | Same electrical specs and package, but RoHS-compliant (non-halogen-free) and commercial-grade (not AEC-Q101 qualified). | Lacks automotive qualification; unsuitable for under-hood or safety-critical vehicle subsystems. | Select SMAJ24AHE3_A/H only for cost-sensitive industrial or consumer applications where AEC-Q101 is not mandated. |
| SMBJ24A-H | Higher 600 W PPPM, same VWM/VC, but larger SMB (DO-214AA) package (5.28 mm × 4.57 mm vs. SMA's 4.50 mm × 2.29 mm). | Requires larger PCB footprint and higher thermal mass; better suited for higher-energy surge environments. | Choose SMBJ24A-H when system-level surge tests exceed IEC 61000-4-5 Level 4 or when board layout permits larger package. |
Compared with SMAJ24AHE3_A/H, the SMAJ24AHM3_A/H adds halogen-free construction and AEC-Q101 validation without altering clamping performance; versus SMBJ24A-H, it trades 50% lower surge capacity for 40% smaller footprint and tighter layout integration.
Availability
SMAJ24AHM3_A/H is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface protection, and telecom DC input stage designs requiring stable component supply, halogen-free compliance, and AEC-Q101 assurance.
Supply support for SMAJ24AHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series targets high-speed transient suppression in space-constrained, high-reliability applications - engineered for automotive, industrial, and telecom systems where consistent clamping, low leakage, and qualification-grade consistency are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ24AHM3_A/H under a 10/1000 μs surge?
The SMAJ24AHM3_A/H 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 Figure 1 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMAJ24AHM3_A/H maintains this clamping performance across its qualified temperature range and after repeated surges when mounted per recommended pad layout.
Is the SMAJ24AHM3_A/H suitable for automotive applications?
Yes, the SMAJ24AHM3_A/H is AEC-Q101 qualified, as confirmed in the Vishay ordering information table (page 3, footnote 1) and mechanical data section. It meets automotive reliability requirements including temperature cycling, high-temperature reverse bias, and ESD testing. The SMAJ24AHM3_A/H is explicitly designated for under-hood and body electronics use where 24 V system protection against load dump and ISO 7637-2 pulses is required.
What does the "HM3" suffix indicate in SMAJ24AHM3_A/H?
The "HM3" suffix in SMAJ24AHM3_A/H denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction. Per Vishay's ordering information (page 3), "HM3" parts use halogen-free molding compound and meet JESD201 Class 2 whisker resistance, distinguishing them from "HE3" (RoHS-compliant, AEC-Q101) and "E3/M3" (commercial-grade) variants. The "_A/H" indicates packaging in 7" tape-and-reel with 1800 units per reel.
How does the thermal resistance of the SMAJ24AHM3_A/H affect PCB layout?
The SMAJ24AHM3_A/H has RθJA = 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal, as specified in the Thermal Characteristics table (page 3). To maintain TJ ≤ 150 °C under 3.3 W steady-state dissipation, designers must ensure adequate copper area and avoid thermal bottlenecks. Reducing pad size or omitting thermal vias increases junction temperature and may derate surge capability - the SMAJ24AHM3_A/H's performance is validated only with the referenced layout.
Can the SMAJ24AHM3_A/H replace bidirectional TVS diodes in circuit designs?
No, the SMAJ24AHM3_A/H is unidirectional and must not replace bidirectional devices (e.g., SMAJ24CA) without circuit redesign. Its cathode-band polarity requires correct orientation: cathode to protected line, anode to ground. Applying reverse voltage beyond VWM will cause conduction only in one direction; using it in AC-coupled or floating signal paths risks failure. The SMAJ24AHM3_A/H is intended solely for DC rail protection with defined ground reference.
SMAJ24AHM3_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:
- 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_A/H FAQ
1.How can I place an order for SMAJ24AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24AHM3_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 SMAJ24AHM3_A/H reliable?
The price and inventory of SMAJ24AHM3_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 SMAJ24AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ24AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24AHM3_A/H?
SMAJ24AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24AHM3_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 SMAJ24AHM3_A/H?
For technical support, including SMAJ24AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ24AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ24AHM3_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 SMAJ24AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ24AHM3_A/H?
All SMAJ24AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24AHM3_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 SMAJ24AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ24AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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