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Vishay General Semiconductor - Diodes Division SMAJ24A-M3/61
- Part No.:
- SMAJ24A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24A-M3/61.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,765
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Product details
Overview
SMAJ24A-M3/61 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 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, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMAJ24A-M3/61 datasheet, SMAJ24A-M3/61 pinout, SMAJ24A-M3/61 application, or SMAJ24A-M3/61 equivalent, key selection criteria include unidirectional polarity, 120 °C/W junction-to-ambient thermal resistance, 150 °C max operating junction temperature, 1.0 μA max reverse leakage at VWM, and halogen-free RoHS-compliant construction per M3 suffix.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal conditions it presents high impedance (>1 GΩ) up to 24 V, then avalanches sharply at ~27.5 V nominal breakdown to clamp transient energy into ground. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling sub-nanosecond response to ESD and lightning-induced surges.
Designed for PCB-level protection of DC power rails and low-speed signal lines, SMAJ24A-M3/61 complies with IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT) immunity standards when applied with proper layout - including short traces, low-inductance grounding, and adequate copper pour per Vishay's recommended 0.2" × 0.2" pad design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit of protected circuit's steady-state voltage. |
| VBR @ IT = 1 mA | 26.7–29.5 V - Breakdown threshold range; ensures reliable conduction onset during overvoltage events without premature triggering. |
| VC @ IPPM = 10.3 A | 38.9 V - Clamped voltage seen by downstream circuitry during 10/1000 μs surge; determines maximum stress on protected IC or MOSFET. |
| PPPM | 400 W - Peak pulse power handling capability; supports robust protection against 100 A surge currents when derated above 78 V (300 W applies here). |
| IPPM | 10.3 A - Maximum non-repetitive peak pulse current; defines surge current capacity under standardized 10/1000 μs waveform. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs thermal design margin for sustained power dissipation. |
| TJmax | +150 °C - Absolute maximum junction temperature; sets upper limit for ambient + self-heating in high-duty-cycle applications. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C reflow peak), matte tin-plated leads. Cathode indicated by band on body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or return path; forms current sink during transient clamping. |
| Cathode | High-side transient input terminal | Connected to line being protected (e.g., 24 V rail or sensor output); conducts avalanche current to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against high-energy transients like ISO 7637-2 Pulse 1/2a/5a in automotive 24 V systems without external series impedance. |
| 38.9 V clamping voltage at 10.3 A | Limits voltage stress on 30 V-rated MOSFETs or 3.3 V/5 V logic interfaces powered from regulated 24 V supplies. |
| 1.0 μA max reverse leakage at 24 V | Minimizes standby power loss and avoids false triggering in battery-powered or low-quiescent-current applications. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, simplifying SMT assembly for high-volume production. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for industrial and automotive OEMs without compromising surge performance. |
Applications
| Industrial Motor Control | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O pins from inductive kickback during solenoid or relay switching in PLCs and motor drives. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between 24 V supply rail and ground, clamping transients within 1 ns. Use Value: Prevents latch-up or permanent damage to 3.3 V MCU GPIOs and 60 V-rated N-channel MOSFETs by limiting voltage to ≤38.9 V during 100 V/100 ns spikes. |
Use Scenario: Safeguarding LIN bus transceivers and door module sensors against load dump and jump-start surges in 24 V vehicle architectures. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V power input to BCM, positioned upstream of LDO regulators. Use Value: Maintains system uptime by absorbing 400 W pulses without degradation, meeting ISO 16750-2 Load Dump Test (Test 4b) requirements. |
| Telecom Power Supply Input | Industrial Sensor Signal Conditioning |
|
Use Scenario: Front-end protection of AC/DC and DC/DC converters in base station power supplies exposed to lightning-induced surges on -48 V telecom rails. IC Role / Device Role / Timing Role: Primary clamping device on input bulk capacitor node, coordinated with MOV and fuse. Use Value: Provides precise 38.9 V clamping to prevent overvoltage failure of downstream SiC MOSFETs while avoiding nuisance tripping during normal 56 V float voltage operation. |
Use Scenario: Transient suppression on analog outputs (e.g., 4–20 mA loop drivers) and digital sensor interfaces (I²C, SPI) in factory automation equipment. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) unidirectional TVS placed directly at connector entry point. Use Value: Preserves signal integrity with <1.0 μA leakage at 24 V, ensuring accurate current-loop calibration and preventing false fault detection during ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/61 | Same electrical specs and package; RoHS-compliant but not halogen-free (E3 vs. M3). | Acceptable where halogen-free requirement is not mandated (e.g., commercial-grade telecom equipment). | Select SMAJ24A-E3/61 for cost-sensitive, non-automotive applications requiring only RoHS compliance. |
| SMAJ24CA-M3/61 | Bidirectional variant; symmetric VBR (26.7–29.5 V) in both polarities; same VC, PPPM, and package. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN) where polarity reversal may occur. | Choose SMAJ24CA-M3/61 only when protecting bidirectional data lines or ungrounded circuits - not a drop-in replacement for unidirectional use. |
Compared with SMAJ24A-M3/61, the E3 version offers identical surge performance with standard RoHS compliance, while the CA variant adds bidirectional symmetry at the cost of unnecessary complexity for DC rail protection - making SMAJ24A-M3/61 optimal for fixed-polarity 24 V system protection where halogen-free materials are required.
Availability
SMAJ24A-M3/61 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and telecom power supply designs requiring stable component supply, halogen-free compliance, and AEC-Q101-optional qualification path.
Supply support for SMAJ24A-M3/61 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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and application-specific performance.
The SMAJ series was developed for high-reliability board-level transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and robust surge handling are critical.
FAQ
What is the maximum clamping voltage of SMAJ24A-M3/61 under a 10/1000 μs surge?
The SMAJ24A-M3/61 has a maximum clamping voltage (VC) of 38.9 V at 10.3 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and defines the highest voltage imposed on protected circuitry during standardized surge testing. The clamping performance remains stable across its full operating temperature range (-55 °C to +150 °C), making SMAJ24A-M3/61 suitable for under-hood automotive and industrial environments.
Is SMAJ24A-M3/61 suitable for protecting 24 V automotive power rails?
Yes, SMAJ24A-M3/61 is widely deployed for 24 V automotive power rail protection, particularly in body control modules and lighting drivers. Its 24 V standoff voltage aligns with nominal 24 V system ratings, and its 400 W peak pulse power handles ISO 7637-2 Pulse 5a (load dump) when combined with appropriate series impedance. While not AEC-Q101 qualified by default, the M3 suffix supports qualification via Vishay's HM3 variant - confirming SMAJ24A-M3/61's suitability for automotive-grade designs with proper validation.
How does the M3 suffix differ from E3 in SMAJ24A-M3/61?
The M3 suffix in SMAJ24A-M3/61 indicates halogen-free, RoHS-compliant construction, whereas E3 denotes RoHS-compliant but standard brominated flame-retardant molding compound. Both share identical electrical specifications, thermal performance, and mechanical dimensions. The M3 variant meets stricter environmental mandates (e.g., EU ELV, JIG-101) and is preferred for automotive and green industrial applications - confirming SMAJ24A-M3/61 as the compliant choice where halogen content must be minimized without sacrificing surge capability.
What is the thermal resistance of SMAJ24A-M3/61, and how does it affect layout?
SMAJ24A-M3/61 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 minimal PCB copper; increasing pad area or adding internal ground planes reduces RθJA and improves power handling. For continuous transient duty cycles, designers must ensure peak junction temperature stays below 150 °C - meaning SMAJ24A-M3/61 requires careful thermal layout in high-frequency surge environments to avoid thermal runaway.
Can SMAJ24A-M3/61 be used in place of SMAJ24CA-M3/61?
No - SMAJ24A-M3/61 is unidirectional and cannot replace SMAJ24CA-M3/61 in bidirectional applications such as AC signal lines or floating differential buses (e.g., RS-485). The CA variant clamps in both directions with symmetrical VBR, while SMAJ24A-M3/61 only conducts from cathode to anode. Substituting SMAJ24A-M3/61 in a bidirectional circuit leaves the reverse polarity unprotected, risking component failure. Always verify polarity requirements before selecting SMAJ24A-M3/61 or any TVS variant.
SMAJ24A-M3/61 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ24A-M3/61 FAQ
1.How can I place an order for SMAJ24A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24A-M3/61 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 SMAJ24A-M3/61 reliable?
The price and inventory of SMAJ24A-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ24A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24A-M3/61?
SMAJ24A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24A-M3/61 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 SMAJ24A-M3/61?
For technical support, including SMAJ24A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24A-M3/61 requirements.
6.How does Aetrix verify that SMAJ24A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ24A-M3/61 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 SMAJ24A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ24A-M3/61?
All SMAJ24A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24A-M3/61, 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 SMAJ24A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ24A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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