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Vishay General Semiconductor - Diodes Division SMBJ24A/54
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- Part No.:
- SMBJ24A/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24A/54.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,362
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Product details
Overview
SMBJ24A/54 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. 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 15.4 A peak pulse current, and 600 W peak pulse power rating with a 10/1000 µs waveform - deployed on power rails and signal lines in industrial motor drives.
For engineers reviewing the SMBJ24A/54 datasheet, SMBJ24A/54 pinout, SMBJ24A/54 application, or SMBJ24A/54 equivalent, key selection criteria include clamping performance under 15.4 A surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, AEC-Q101 qualification eligibility, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds VBR, it avalanches rapidly to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at 24 V), while the low incremental surge resistance enables consistent clamping across repetitive transients.
The device is rated for 100 A non-repetitive forward surge (IFSM) and supports continuous operation from –55 °C to +150 °C junction temperature. Its MSL Level 1 moisture sensitivity and matte tin-plated leads comply with J-STD-002 solderability standards - critical for high-reliability reflow profiles in automotive and industrial PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum DC or RMS voltage the device blocks during normal operation without clamping |
| VBR (min/max) | 26.7 V / 29.5 V at IT = 1 mA - defines reliable avalanche initiation threshold for overvoltage detection |
| VC @ IPPM | 38.9 V at 15.4 A - maximum voltage seen by protected circuit during 600 W transient event |
| PPPM | 600 W - peak pulse power handling capability with 10/1000 µs waveform, 0.01% duty cycle |
| IPPM | 15.4 A - peak surge current the device safely clamps without degradation |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads |
| TJ max | +150 °C - maximum allowable junction temperature for sustained reliability in enclosed enclosures |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile plastic case with matte tin-plated leads. Cathode indicated by a band on the body; anode is unmarked end. Compliant with UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lower-potential rail; completes shunt path for surge diversion |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V DC systems |
| 38.9 V clamping voltage @ 15.4 A | Limits stress on 3.3 V/5 V logic interfaces and MOSFET gate drivers during transient events |
| Glass-passivated junction | Ensures stable VBR tolerance (±5%) and <1.0 µA leakage at VWM after 1000 hrs life test |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow without popcorn cracking or parametric shift |
| AEC-Q101 qualification option | Available with HE3/HM3 suffixes for automotive powertrain and body control modules |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 24 V DC input rails against load-dump and inductive switching transients in PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional TVS shunt element placed between VIN and GND, clamping spikes within 1 ns response time. Use Value: Prevents latch-up or permanent damage to upstream DC/DC converters and microcontrollers during 100 V/50 ms load dump events. |
Use Scenario: Surge suppression on LIN bus power supply lines in door module ECUs exposed to battery disconnect transients. IC Role / Device Role / Timing Role: Standoff-rated TVS connected directly to 12 V rail, absorbing >600 W pulses without derating at +105 °C ambient. Use Value: Maintains functional safety integrity per ISO 16750-2 by limiting rail voltage to ≤38.9 V during 100 V/50 ms transients. |
| Telecom Power Supplies | Consumer Appliance Control Boards |
|
Use Scenario: Input-stage protection for 48 V PoE-powered base stations subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary clamping device ahead of DC/DC front-end, coordinated with MOVs for multi-stage protection. Use Value: Delivers precise 38.9 V clamping with minimal capacitance (≈200 pF), preserving signal integrity on high-frequency power monitoring paths. |
Use Scenario: Overvoltage safeguard on microcontroller VDD rails in washing machine main control boards exposed to relay coil flyback. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) unidirectional suppressor mounted adjacent to MCU power pins. Use Value: Eliminates need for external series resistance by maintaining <1 µA leakage at 24 V, avoiding standby current penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA | Bidirectional variant; symmetric VBR = 26.7–29.5 V; no polarity marking; higher ID (≤2.0 µA) | Required for AC-coupled signal lines or dual-rail protection where reverse polarity transients occur | Select SMBJ24CA only when bidirectional clamping is mandated - not a drop-in replacement for SMBJ24A/54 |
| SMCJ24A | Same VWM/VBR but in larger SMC (DO-214AB) package; 1500 W PPPM; RθJA = 50 °C/W | Suitable for higher-energy transients (e.g., IEC 61000-4-5 Level 5) requiring >600 W dissipation | Choose SMCJ24A when board space allows and surge energy exceeds SMBJ24A/54's 600 W rating |
Compared with SMBJ24CA and SMCJ24A, the SMBJ24A/54 offers optimal balance of compact SMB footprint, 600 W surge capacity, and unidirectional precision for 24 V DC rail protection - making it preferred for space-constrained industrial and automotive control units where polarity is fixed and energy levels are moderate.
Availability
SMBJ24A/54 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power supplies, and consumer appliance control boards requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for SMBJ24A/54 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, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-volume surface-mount surge protection in harsh environments - targeting automotive, industrial, and telecom applications where compact size, repeatable clamping, and AEC-Q101 compliance are essential.
FAQ
What is the clamping voltage of SMBJ24A/54 at its rated peak pulse current?
The SMBJ24A/54 has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current of 15.4 A using a 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and guarantees the protected circuit will not experience more than 38.9 V during such a transient - critical for ensuring compatibility with 3.3 V or 5 V logic interfaces downstream of the SMBJ24A/54.
Is SMBJ24A/54 RoHS-compliant and halogen-free?
Yes, SMBJ24A/54 is available in both RoHS-compliant commercial-grade variants: the E3 suffix denotes standard RoHS compliance, while the M3 suffix indicates halogen-free, RoHS-compliant construction. Both meet JESD 201 Class 2 whisker resistance requirements and UL 94 V-0 flammability rating - confirmed in Vishay document 88392, revision 09-Jan-2024.
Does SMBJ24A/54 support automotive qualification?
SMBJ24A/54 itself is not AEC-Q101 qualified, but Vishay offers functionally identical automotive-grade versions under ordering codes SMBJ24AHE3_X (RoHS + AEC-Q101) and SMBJ24AHM3_X (halogen-free + RoHS + AEC-Q101), where "_X" denotes revision letter. These variants share identical electrical specs and SMB package dimensions, enabling seamless qualification upgrade without layout change.
What is the thermal resistance of SMBJ24A/54, and how does it affect PCB layout?
The SMBJ24A/54 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. This value assumes minimum recommended pad layout per Vishay's DO-214AA footprint - underscoring the need for adequate copper area to maintain TJ ≤ 150 °C during repetitive surge events. Reducing pad size increases RθJA and risks thermal runaway.
How does SMBJ24A/54 differ from SMBJ24CA in circuit implementation?
SMBJ24A/54 is unidirectional with cathode band marking and blocks reverse current above 24 V, whereas SMBJ24CA is bidirectional with no polarity marking and clamps symmetrically in both directions. In a 24 V DC system, SMBJ24A/54 must be oriented with cathode toward the protected rail; SMBJ24CA eliminates orientation concerns but exhibits higher leakage (≤2.0 µA vs. ≤1.0 µA) and cannot replace SMBJ24A/54 without verifying AC-coupled signal integrity.
SMBJ24A/54 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/54 FAQ
1.How can I place an order for SMBJ24A/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24A/54 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/54 reliable?
The price and inventory of SMBJ24A/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24A/54 is usually 5 days.
3.What payment methods are accepted for SMBJ24A/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24A/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24A/54?
SMBJ24A/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24A/54 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/54?
For technical support, including SMBJ24A/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24A/54 requirements.
6.How does Aetrix verify that SMBJ24A/54 is sourced from the original manufacturer or authorized distributors?
All SMBJ24A/54 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/54 meets industry standards.
7.What is the process for return or replacement of SMBJ24A/54?
All SMBJ24A/54 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24A/54, 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/54 part is unused and in its original packaging.
Return procedure for SMBJ24A/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ24A/54 Tags
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