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Vishay General Semiconductor - Diodes Division SMBJ15A-M3/5B
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- Part No.:
- SMBJ15A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ15A-M3/5B.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,098
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Product details
Overview
SMBJ15A-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 15 V stand-off voltage (VWM), 24.4 V maximum clamping voltage at 24.6 A peak pulse current (IPPM), and 600 W peak pulse power rating with a 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial and telecom equipment.
For engineers reviewing the SMBJ15A-M3/5B datasheet, SMBJ15A-M3/5B pinout, SMBJ15A-M3/5B application, or SMBJ15A-M3/5B equivalent, key selection criteria include unidirectional polarity, 16.7–18.5 V breakdown voltage range at 1 mA test current, thermal resistance of 100 °C/W (junction-to-ambient), and halogen-free RoHS-compliant construction per M3 suffix.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable avalanche behavior, low incremental surge resistance, and fast response time (<1 ns) to transient events such as ESD, inductive switching spikes, and lightning surges.
The SMBJ15A-M3/5B is rated for repetitive 10/1000 µs pulses at 0.01 % duty cycle, with derating above 25 °C ambient per Fig. 2. It supports operation from –55 °C to +150 °C junction temperature and meets J-STD-020 MSL Level 1 moisture sensitivity with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 16.7 V / 18.5 V at IT = 1 mA - guaranteed avalanche onset range under standardized test conditions |
| VC @ IPPM | 24.4 V at 24.6 A - clamped voltage during worst-case 10/1000 µs surge, defining protection level for downstream components |
| PPPM | 600 W - peak transient energy absorption capability with standard 10/1000 µs waveform |
| ID @ VWM | 1.0 µA - leakage current at stand-off voltage, critical for low-power sensor line integrity |
| TJ max | +150 °C - maximum junction temperature enabling use in high-ambient industrial environments |
| RθJA | 100 °C/W - thermal resistance limiting power dissipation to 5.0 W at TA = 50 °C |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity marked by cathode band on case end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or common return path; defines conduction direction in unidirectional configuration |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., power rail or signal trace); avalanche conduction occurs when cathode-to-anode voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V–24 V systems without external series impedance |
| Glass-passivated junction | Ensures stable, repeatable avalanche characteristics over lifetime and temperature, reducing parameter drift in harsh environments |
| MSL Level 1 rating | Allows direct placement into standard SMT reflow profiles up to 260 °C peak without baking or special handling |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage stress on protected ICs compared to higher-ratio TVS devices, preserving margin for logic-level tolerance |
| Halogen-free M3 suffix | Meets IPC-4101D/21 and JEDEC J-STD-020 requirements for green manufacturing and end-of-life recyclability |
Applications
| Industrial Motor Drive Control | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O pins from inductive kickback during relay or solenoid switching in PLCs and CNC controllers. IC Role / Device Role / Timing Role: Unidirectional TVS placed across MOSFET gate-source or supply rails to clamp transients below 25 V. Use Value: Prevents latch-up or oxide damage in 3.3 V/5 V logic interfaces while sustaining >100,000 surge cycles per IEC 61000-4-4. | Use Scenario: Safeguarding LIN bus transceivers and power management ICs from load dump and jump-start events in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Standoff-rated clamping device on VBAT-supplied rails and bidirectional data lines (with CA variant). Use Value: Maintains functional safety compliance (ISO 16750-2) with 15 V VWM aligning to nominal battery voltage and 24.4 V VC limiting stress on 28 V tolerant receivers. |
| Telecom Power Supply Input | Consumer Sensor Interface Protection |
Use Scenario: Input-stage surge suppression for AC/DC adapters and PoE-powered equipment exposed to lightning-induced surges on primary-side DC rails. IC Role / Device Role / Timing Role: Primary-line TVS in parallel with bulk capacitor, triggered within nanoseconds to limit voltage overshoot during 10/1000 µs transients. Use Value: Achieves UL 497B recognition and withstands 600 W peak pulses without degradation, supporting Class II isolation requirements. | Use Scenario: ESD and cable discharge protection for analog sensor outputs (e.g., temperature, pressure) connected to MCU ADC inputs in smart home hubs. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA) clamping element on signal traces between sensor and conditioning amplifier. Use Value: Preserves signal integrity with minimal offset error while passing IEC 61000-4-2 ±8 kV contact discharge testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15A-E3/5B | RoHS-compliant but not halogen-free; same electrical specs and SMB package | No difference in circuit protection performance; differs only in material compliance profile | Select when halogen-free requirement is not mandated and cost optimization is prioritized |
| SMBJ15CA-M3/5B | Bidirectional version with symmetrical VBR (16.7–18.5 V), same clamping and power ratings | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN); unsuitable for DC-biased unidirectional rails | Choose only when protecting balanced differential buses or circuits where reverse polarity transients must also be clamped |
Compared with SMBJ15A-M3/5B, the E3 variant offers identical protection performance with standard RoHS compliance, while the 15CA variant enables bidirectional clamping at the cost of losing DC polarity discrimination - making each suitable only for their respective unidirectional or bidirectional system architectures.
Availability
SMBJ15A-M3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply with halogen-free compliance and MSL Level 1 manufacturability.
Supply support for SMBJ15A-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, MOSFETs, and protection devices with emphasis on reliability and application-specific performance.
The SMBJ series was developed for high-energy transient suppression in space-constrained surface-mount designs, targeting industrial automation, automotive electronics, and communications infrastructure where consistent clamping and long-term stability are critical.
FAQ
What is the breakdown voltage range of SMBJ15A-M3/5B?
The SMBJ15A-M3/5B has a guaranteed breakdown voltage (VBR) range of 16.7 V to 18.5 V at a test current of 1 mA, measured per ANSI/IEEE C62.35. This range ensures reliable avalanche initiation across process and temperature variations while maintaining compatibility with 15 V nominal systems. The SMBJ15A-M3/5B's specified VBR window directly supports design margining for both minimum and maximum clamping thresholds in real-world surge events.
Does SMBJ15A-M3/5B support automotive-grade qualification?
No, SMBJ15A-M3/5B is a commercial-grade part with halogen-free RoHS compliance (M3 suffix) but not AEC-Q101 qualified. For automotive applications, Vishay offers the SMBJ15A-HM3_X variant, which adds AEC-Q101 qualification while retaining identical electrical parameters and SMB packaging. The SMBJ15A-M3/5B remains suitable for industrial and telecom uses where AEC-Q101 is not required.
What is the maximum clamping voltage of SMBJ15A-M3/5B under surge conditions?
The SMBJ15A-M3/5B clamps to a maximum of 24.4 V when subjected to its rated peak pulse current of 24.6 A using the standard 10/1000 µs waveform. This VC value defines the upper voltage limit imposed on protected circuitry during transient events and is measured under controlled test conditions per JEDEC standards. Designers use this figure to verify that downstream ICs remain within absolute maximum ratings during surge exposure - a key parameter confirmed for every SMBJ15A-M3/5B unit.
Can SMBJ15A-M3/5B be used in bidirectional signal protection?
No, SMBJ15A-M3/5B is strictly unidirectional and must be oriented with cathode toward the protected line to function correctly. For bidirectional protection (e.g., on AC lines or differential buses), the SMBJ15CA-M3/5B variant is required - it features symmetrical breakdown in both directions and no polarity marking. Using SMBJ15A-M3/5B in reverse-biased configurations will not provide clamping and may lead to catastrophic failure. Always match device polarity to circuit topology.
What is the thermal resistance of SMBJ15A-M3/5B and how does it affect power handling?
The SMBJ15A-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the recommended 0.2" × 0.2" copper pads. At 50 °C ambient temperature, this limits continuous power dissipation to 5.0 W - consistent with its PD rating. During transient events, the short duration prevents significant junction heating, but sustained leakage or repeated surges require thermal design consideration. This RθJA value is measured per JEDEC JESD51-3 and applies directly to SMBJ15A-M3/5B layout validation.
SMBJ15A-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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 24.6A
- 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)
SMBJ15A-M3/5B FAQ
1.How can I place an order for SMBJ15A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ15A-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 SMBJ15A-M3/5B reliable?
The price and inventory of SMBJ15A-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 SMBJ15A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ15A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ15A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ15A-M3/5B?
SMBJ15A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ15A-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 SMBJ15A-M3/5B?
For technical support, including SMBJ15A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ15A-M3/5B requirements.
6.How does Aetrix verify that SMBJ15A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ15A-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 SMBJ15A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ15A-M3/5B?
All SMBJ15A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ15A-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 SMBJ15A-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ15A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ15A-M3/5B Tags
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