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Vishay General Semiconductor - Diodes Division SMBJ24D-M3/I
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- Part No.:
- SMBJ24D-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24D-M3/I.pdf
- Description:
- TVS DIODE 24VWM 38.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:25,650
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Product details
Overview
SMBJ24D-M3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, with 24 V stand-off voltage (VWM), 27.1–29.1 V breakdown voltage (VBR) at 1 mA, 38.4 V clamping voltage (VC) at 15.6 A peak pulse current, and 600 W peak pulse power rating for 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD in industrial and telecom equipment.
For engineers reviewing the SMBJ24D-M3/I datasheet, SMBJ24D-M3/I pinout, SMBJ24D-M3/I application, or SMBJ24D-M3/I equivalent, this page delivers verified electrical parameters, exact package dimensions, real-world clamping behavior, thermal derating curves, and validated alternative parts for circuit protection design and BOM optimization.
Technical Context
The SMBJ24D-M3/I operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR range (27.1–29.1 V), clamping transient energy within 1 ns response time. Its low incremental surge resistance and tight ±3.5 % VBR tolerance ensure consistent overvoltage protection across production lots.
Designed for surface-mount assembly on standard PCB pad layouts, it meets J-STD-020 MSL Level 1 (260 °C peak reflow), features matte tin-plated leads, halogen-free RoHS-compliant construction, and supports repetitive surge duty cycles up to 0.01 % under defined thermal conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 27.1 V / 29.1 V at 1 mA - precise avalanche initiation threshold with ±3.5 % tolerance |
| VC @ IPPM | 38.4 V at 15.6 A - clamped voltage during 10/1000 μs surge, limiting stress on downstream components |
| PPPM | 600 W - peak transient power handling capability under standardized 10/1000 μs waveform |
| ID @ VWM | 0.5 μA - ultra-low leakage ensures minimal standby power loss and signal integrity |
| RθJA | 125 °C/W - junction-to-ambient thermal resistance on minimum recommended PCB pad layout |
| TJ max | +150 °C - maximum junction temperature enabling reliable operation in industrial ambient environments |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic case meeting UL 94 V-0 flammability rating; polarity indicated by cathode band at one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected circuit; conducts during forward bias or bidirectional operation |
| Cathode (banded end) | Avalanche clamping terminal | Connected to higher-potential rail; initiates reverse-biased clamping when VWM exceeded |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise, repeatable clamping thresholds across manufacturing batches without system-level calibration |
| 600 W PPPM (10/1000 μs) | Handles high-energy transients from relay coil decay or lightning-induced surges in industrial control systems |
| MSL Level 1 compliance | Supports single-reflow assembly without moisture-related popcorn failure or delamination |
| 0.5 μA ID @ VWM | Minimizes quiescent current draw and avoids false triggering in low-power sensor interfaces |
| Halogen-free, RoHS-compliant M3 suffix | Fulfills environmental compliance requirements for global industrial and telecom product certifications |
Applications
| Industrial Motor Drive Protection | Telecom Power Input Stage |
|---|---|
Use Scenario: Protecting gate drivers and logic ICs from flyback voltage spikes generated by IGBT/MOSFET switching in variable-frequency drives. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus or gate-source terminals to clamp inductive kickback within safe voltage margins. Use Value: Limits transient overshoot to ≤38.4 V, preventing gate oxide rupture and latch-up in 24 V control circuits. | Use Scenario: Safeguarding AC/DC converter inputs and PoE interface circuitry against lightning-induced surges on telecom line cards. IC Role / Device Role / Timing Role: Primary-level surge suppression device mounted at board edge, upstream of input filter and rectifier stage. Use Value: Absorbs 600 W peak energy per event while maintaining <0.5 μA leakage to preserve no-load efficiency. |
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
Use Scenario: Shielding LIN bus transceivers and microcontroller I/O pins from load dump and jump-start transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Unidirectional clamping diode connected between signal line and ground, referenced to battery rail. Use Value: Responds in <1 ns to clamp 24 V-rated lines to ≤38.4 V, compatible with automotive-grade 150 °C junction limit. | Use Scenario: Protecting analog front-end amplifiers and ADC inputs in pressure/temperature sensor modules exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage TVS placed directly at connector entry point to shunt fast transients before reaching precision signal path. Use Value: Delivers 27.1–29.1 V controlled breakdown with ±3.5 % tolerance, ensuring predictable clamping without affecting 24 V sensor supply regulation. |
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-M3/I | Bidirectional variant; symmetric VBR (27.1–29.1 V) and VC (38.4 V) in both polarities; no cathode band marking | Required where AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN) need protection without polarity constraints | Select SMBJ24A-M3/I only if bidirectional clamping is explicitly required; SMBJ24D-M3/I is optimal for DC rail or unidirectional signal protection. |
| SMCJ24A | Higher power rating (1500 W PPPM); larger SMC (DO-214AB) package; same VWM/VBR/VC specs but different thermal resistance (RθJA = 35 °C/W) | Suitable for higher-energy surge environments (e.g., outdoor telecom cabinets) where PCB space allows larger footprint | Choose SMCJ24A when surge energy exceeds 600 W or thermal management requires lower RθJA; SMBJ24D-M3/I fits tighter layouts with adequate 600 W margin. |
Compared with SMBJ24A-M3/I and SMCJ24A, the SMBJ24D-M3/I offers optimized cost, size, and thermal performance for standard 24 V DC protection - delivering precise unidirectional clamping in the smallest qualified SMB package without sacrificing reliability or leakage performance.
Availability
SMBJ24D-M3/I is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and sensor signal conditioning circuits requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ24D-M3/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, TVS devices, and optoelectronics with emphasis on reliability, precision, and industrial-grade qualification.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust, low-leakage transient suppression in harsh electromagnetic environments across automotive, industrial, and communications infrastructure.
FAQ
What is the clamping voltage of SMBJ24D-M3/I at its rated peak pulse current?
The SMBJ24D-M3/I has a maximum clamping voltage (VC) of 38.4 V at 15.6 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is critical for ensuring downstream components remain within their absolute maximum ratings. The SMBJ24D-M3/I maintains this clamping performance across its full operating temperature range.
Is SMBJ24D-M3/I unidirectional or bidirectional, and how is polarity identified?
SMBJ24D-M3/I is a unidirectional TVS diode, meaning it clamps only in reverse bias above VBR and conducts forward like a standard diode below ~0.7 V. Polarity is marked by a cathode band at one end of the SMB (DO-214AA) package - the banded terminal connects to the higher-potential side of the protected circuit. This distinguishes it from bidirectional variants (e.g., SMBJ24CD-M3/I), which lack the band and suppress transients in both directions.
What is the maximum steady-state power dissipation of SMBJ24D-M3/I at room temperature?
At TA = 25 °C, the SMBJ24D-M3/I has a maximum steady-state power dissipation (PD) of 1.0 W when mounted on standard PCB pads. This rating drops linearly with increasing ambient temperature, reaching 0 W at +150 °C, per the derating curve in the Vishay datasheet. For continuous power handling, thermal design must account for RθJA = 125 °C/W on minimum pad layout - making it unsuitable for sustained DC overvoltage but ideal for transient-only protection.
Does SMBJ24D-M3/I meet RoHS and halogen-free requirements?
Yes, the "M3" suffix in SMBJ24D-M3/I explicitly denotes halogen-free, RoHS-compliant construction per JEDEC standards, including JESD201 Class 2 whisker resistance. The molding compound meets UL 94 V-0 flammability rating, and matte tin-plated terminals comply with J-STD-002 and JESD22-B102 solderability requirements - confirming suitability for environmentally regulated industrial and telecom products.
What is the typical junction capacitance of SMBJ24D-M3/I, and does it affect high-speed signal lines?
The SMBJ24D-M3/I does not specify junction capacitance (CJ) in its primary datasheet tables; however, typical CJ for SMBJ-series unidirectional TVS diodes at zero bias is ~500–700 pF, and at VWM = 24 V it drops significantly (typically <100 pF). While not intended for RF or >10 Mbps data line protection, its capacitance is acceptable for 24 V sensor analog outputs, LIN bus, or low-speed digital I/O - but not for USB, HDMI, or high-speed serial interfaces where sub-10 pF devices are required.
SMBJ24D-M3/I 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):
- 27.1V
- Voltage - Clamping (Max) @ Ipp:
- 38.4V
- Current - Peak Pulse (10/1000µs):
- 15.6A
- 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)
SMBJ24D-M3/I FAQ
1.How can I place an order for SMBJ24D-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24D-M3/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 SMBJ24D-M3/I reliable?
The price and inventory of SMBJ24D-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24D-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ24D-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24D-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24D-M3/I?
SMBJ24D-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24D-M3/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 SMBJ24D-M3/I?
For technical support, including SMBJ24D-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24D-M3/I requirements.
6.How does Aetrix verify that SMBJ24D-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ24D-M3/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 SMBJ24D-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ24D-M3/I?
All SMBJ24D-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24D-M3/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 SMBJ24D-M3/I part is unused and in its original packaging.
Return procedure for SMBJ24D-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ24D-M3/I Tags
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