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Vishay General Semiconductor - Diodes Division SMBJ24A-M3/5B
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- Part No.:
- SMBJ24A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24A-M3/5B.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,374
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Product details
Overview
SMBJ24A-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) 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 1.0 mA, 38.9 V maximum clamping voltage (VC) at 15.4 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives, automotive body control modules, and industrial sensor interfaces.
For engineers reviewing the SMBJ24A-M3/5B datasheet, SMBJ24A-M3/5B pinout, SMBJ24A-M3/5B application, or SMBJ24A-M3/5B equivalent, key selection criteria include clamping performance under 15.4 A surge, thermal resistance (RθJA = 100 °C/W), halogen-free RoHS compliance (M3 suffix), unidirectional polarity, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 24 V, it avalanches to limit transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while the 100 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design per Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) layout.
The device sustains repetitive 600 W pulses at 0.01% duty cycle and handles non-repetitive 100 A forward surge (8.3 ms half-sine), making it suitable for protection against inductive switching transients and ESD events in 24 V systems. Its M3 suffix confirms halogen-free, RoHS-compliant construction and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines system rail compatibility. |
| VBR (min/max) | 26.7 V / 29.5 V at IT = 1.0 mA - Confirmed avalanche onset range; ensures reliable triggering above nominal rail. |
| VC @ IPPM | 38.9 V at 15.4 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 600 W - Peak pulse power handling capability; validates protection margin against IEC 61000-4-5 Level 3/4 surges. |
| IPPM | 15.4 A - Peak surge current supported at rated clamping voltage; used to size upstream fusing and trace routing. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; mandates minimum 5.0 mm × 5.0 mm copper pad area for safe 5.0 W dissipation. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial enclosures. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads. Cathode indicated by band marking on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or return path; completes clamping loop during transient events. |
| Cathode | High-side protected node terminal | Connected to protected line (e.g., 24 V supply rail); conducts avalanche current when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates robustness against IEC 61000-4-5 surge waveforms in industrial and automotive environments. |
| Clamping voltage ≤ 38.9 V at 15.4 A | Ensures downstream 3.3 V/5 V logic and microcontrollers remain within absolute maximum ratings during transients. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and EU environmental compliance for global OEM programs. |
| MSL Level 1, LF peak 260 °C | Supports lead-free reflow soldering without moisture sensitivity concerns or pre-bake requirements. |
| 150 °C maximum junction temperature | Enables deployment in high-temperature zones such as engine compartments and industrial PLC backplanes. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 24 V DC bus against inductive kickback from relay coils and solenoid drivers. IC Role / Device Role / Timing Role: Shunt TVS diode placed across power input terminals to clamp voltage spikes to ≤38.9 V. Use Value: Prevents MOSFET gate oxide damage and MCU reset events caused by >100 V transients during load switching. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins from battery dump and load-dump events. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN line and ground to absorb negative-going transients. Use Value: Maintains signal integrity below 40 V clamping threshold, ensuring uninterrupted communication during ISO 7637-2 Pulse 5a events. |
| Industrial Sensor Interfaces | Power Supply Input Protection |
|
Use Scenario: Shielding analog sensor outputs (e.g., 4–20 mA loops) from ESD and field-induced surges. IC Role / Device Role / Timing Role: TVS placed at connector entry point to shunt fast transients before reaching precision amplifier inputs. Use Value: Limits voltage excursion to <39 V, preserving 16-bit ADC accuracy and preventing op-amp saturation or latch-up. |
Use Scenario: Front-end protection of 24 V SMPS inputs against lightning-induced surges and AC line coupling. IC Role / Device Role / Timing Role: Primary clamping device across bulk capacitor input, coordinated with MOV and fuse. Use Value: Absorbs up to 600 W transient energy without degradation, enabling compliance with UL 62368-1 surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A-E3/5B | Same electrical specs, but RoHS-compliant commercial grade (E3) instead of halogen-free (M3); no JESD201 Class 2 whisker rating. | Acceptable for non-automotive commercial designs where halogen content and whisker resistance are not mandated. | Select SMBJ24A-E3/5B only if halogen-free requirement is waived and JESD201 Class 2 is not specified in procurement specs. |
| SMBJ24CA-M3/5B | Bidirectional variant: symmetric VBR (26.7–29.5 V), same VC (38.9 V), but supports AC-coupled or floating signal lines. | Required for differential buses (e.g., RS-485), antenna lines, or any application needing protection in both polarities. | Choose SMBJ24CA-M3/5B only when bidirectional clamping is essential; unidirectional SMBJ24A-M3/5B is optimal for DC rails with defined polarity. |
Compared with SMBJ24A-E3/5B, the SMBJ24A-M3/5B adds halogen-free compliance and whisker resistance for automotive use, while SMBJ24CA-M3/5B extends functionality to AC or floating nodes - neither is pin-compatible drop-in replacements, as polarity and application context differ fundamentally.
Availability
SMBJ24A-M3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and industrial sensor interfaces requiring stable component supply, long-term lifecycle support, and halogen-free compliance.
Supply support for SMBJ24A-M3/5B 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 AEC-Q qualification.
The SMBJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where 600 W surge handling and 150 °C operation are mandatory.
FAQ
What is the clamping voltage of SMBJ24A-M3/5B at its rated peak pulse current?
The SMBJ24A-M3/5B has a maximum clamping voltage (VC) of 38.9 V at 15.4 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ24A-M3/5B maintains this clamping performance across its full operating temperature range, ensuring consistent protection in demanding applications.
Is SMBJ24A-M3/5B suitable for automotive applications?
Yes, SMBJ24A-M3/5B is halogen-free, RoHS-compliant, and meets JESD201 Class 2 whisker resistance - all required for many automotive subsystems. While the base M3 version is commercial-grade, it can be used in non-safety-critical automotive modules like body control units and lighting drivers. For AEC-Q101-qualified versions, Vishay offers SMBJ24A-HM3_X variants; the SMBJ24A-M3/5B itself is not AEC-Q101 certified but shares identical electrical and thermal characteristics.
How does the M3 suffix affect the SMBJ24A-M3/5B specification?
The M3 suffix on SMBJ24A-M3/5B indicates halogen-free, RoHS-compliant construction with matte tin-plated leads that pass JESD201 Class 2 whisker testing. It does not alter electrical parameters - VWM, VBR, VC, and PPPM remain identical to E3-suffix variants. The M3 designation primarily addresses environmental compliance and reliability in high-reliability assemblies, especially where halogen content restrictions apply per IPC-1752A or OEM material declarations.
What is the thermal resistance of SMBJ24A-M3/5B, and how does it impact PCB layout?
The SMBJ24A-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To sustain its 5.0 W steady-state power dissipation, designers must allocate sufficient copper area and consider thermal vias. Reducing pad size increases RθJA, risking thermal runaway during repetitive surges - hence Vishay's recommended layout is mandatory for rated performance of SMBJ24A-M3/5B.
Can SMBJ24A-M3/5B replace SMBJ24CA-M3/5B in a circuit?
No, SMBJ24A-M3/5B cannot directly replace SMBJ24CA-M3/5B because it is unidirectional, whereas SMBJ24CA-M3/5B is bidirectional. Substituting SMBJ24A-M3/5B in a bidirectional application (e.g., RS-485 data lines) would leave positive transients unprotected. The SMBJ24A-M3/5B clamps only in reverse bias; forward conduction is limited to 3.5 V at 50 A. Always verify polarity requirements before selecting between SMBJ24A-M3/5B and its CA counterpart.
SMBJ24A-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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):
- 15.4A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SMBJ24A-M3/5B FAQ
1.How can I place an order for SMBJ24A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24A-M3/5B 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 SMBJ24A-M3/5B reliable?
The price and inventory of SMBJ24A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ24A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24A-M3/5B?
SMBJ24A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24A-M3/5B 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 SMBJ24A-M3/5B?
For technical support, including SMBJ24A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24A-M3/5B requirements.
6.How does Aetrix verify that SMBJ24A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ24A-M3/5B 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 SMBJ24A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ24A-M3/5B?
All SMBJ24A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24A-M3/5B, 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 SMBJ24A-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ24A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ24A-M3/5B Tags
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Diodes Incorporated
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Diodes Incorporated
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