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Vishay General Semiconductor - Diodes Division SMBJ45D-M3/I
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- Part No.:
- SMBJ45D-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45D-M3/I.pdf
- Description:
- TVS DIODE 45VWM 71.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:10,395
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Product details
Overview
SMBJ45D-M3/I 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 DC power rails and signal lines. It features a 45 V stand-off voltage (VWM), 50.8–54.5 V breakdown voltage (VBR) at 1 mA, 71.6 V maximum clamping voltage (VC) at 8.4 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, microcontrollers, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ45D-M3/I datasheet, SMBJ45D-M3/I pinout, SMBJ45D-M3/I application, or SMBJ45D-M3/I equivalent, key selection criteria include its unidirectional polarity, ±3.5 % VBR tolerance, low 0.5 μA reverse leakage at VWM, M3-grade halogen-free RoHS-compliant construction, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when transient voltage exceeds its breakdown threshold. Its low incremental surge resistance and fast response time ensure effective suppression of ESD, lightning-induced surges, and inductive switching spikes without latch-up or degradation under repetitive 0.01 % duty cycle conditions.
The SMBJ45D-M3/I is rated for junction temperatures from –55 °C to +150 °C, with thermal resistance RθJA = 125 °C/W on minimum recommended pad layout and RθJM = 20 °C/W to mounting surface. It meets J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC rail protection window. |
| VBR min/max | 50.8 V / 54.5 V at 1 mA - tight ±3.5 % tolerance ensures predictable turn-on across production lots. |
| VC @ IPPM | 71.6 V at 8.4 A - clamping voltage during 10/1000 μs surge; determines maximum stress on downstream ICs. |
| PPPM | 600 W - peak pulse power handling capability with standardized 10/1000 μs waveform; validates robustness against IEC 61000-4-5 surges. |
| ID @ VWM | 0.5 μA - ultra-low reverse leakage at stand-off voltage; minimizes standby power loss in battery-powered systems. |
| TJ max | +150 °C - maximum junction temperature; supports operation in high-ambient industrial environments. |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 2.20 mm × 3.94 mm footprint and cathode band marking. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional configuration with cathode band denoting the cathode terminal. Matte tin-plated leads meet J-STD-002 solderability and JESD 22-B102 reliability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential point in protected circuit; forms return path during clamping. |
| Cathode | High-side transient input | Connected to line being protected (e.g., 45 V supply rail); avalanche conduction initiates here during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise, repeatable clamping thresholds across manufacturing batches - critical for compliance with IEC 61000-4-2/4-5 immunity margins. |
| 600 W PPPM (10/1000 μs) | Validates single-event surge survivability up to Level 4 (4 kV line-to-line, 2 kV line-to-ground per IEC 61000-4-5). |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow without preconditioning - eliminates moisture-related popcorning risk in high-volume SMT assembly. |
| M3 suffix compliance | Halogens-free, RoHS-compliant, and JESD 201 Class 2 whisker-resistant - meets automotive and industrial environmental mandates. |
| Low 0.5 μA ID @ VWM | Reduces quiescent current draw in always-on circuits such as IoT sensor nodes or backup power monitors. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 48 V auxiliary power rails in programmable logic controllers (PLCs) and motor drives from load dump and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed across input capacitor to limit transient voltage to ≤71.6 V during 600 W surges. Use Value: Prevents damage to upstream DC-DC controllers and downstream 3.3 V/5 V LDOs by holding rail voltage within safe SOA limits during 10/1000 μs events. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins in BCMs exposed to ISO 7637-2 Pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply line with fast <1 ns response to clamp sub-microsecond spikes before IC damage occurs. Use Value: Maintains functional safety integrity by limiting voltage excursion below 71.6 V - well under typical 80 V absolute maximum ratings of automotive MCUs. |
| Telecom PoE Interface Protection | Consumer Sensor Hub ESD Shielding |
Use Scenario: Secondary-level surge protection on IEEE 802.3af/at Power over Ethernet (PoE) data lines and power pairs. IC Role / Device Role / Timing Role: Unidirectional TVS on DC bias side of PoE injector output, coordinated with primary GDT or MOV stages. Use Value: Adds precision clamping layer with 45 V VWM to avoid false triggering during normal 57 V PoE operation while suppressing >100 V transients. |
Use Scenario: ESD protection for I²C/SPI lines connecting MEMS accelerometers and environmental sensors to host SoCs in smart home devices. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. <100 pF) placed directly at connector entry point to shunt HBM ±8 kV discharges. Use Value: Preserves signal integrity on 400 kHz I²C buses by limiting clamping voltage to 71.6 V without adding jitter or timing skew. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A-M3/I | Bidirectional variant with same VWM (45 V) but symmetrical clamping in both polarities; higher capacitance due to dual-junction structure. | Required where AC-coupled or floating signal lines (e.g., RS-485, CAN bus) need protection against bipolar transients. | Select SMBJ45A-M3/I only if bidirectional clamping is mandated; SMBJ45D-M3/I offers lower leakage and better DC rail efficiency. |
| SMCJ45A-M3/I | Larger SMC (DO-214AB) package with 1500 W PPPM rating; identical VWM/VBR/VC specs but higher thermal mass and 2× footprint area. | Preferred in high-energy surge environments (e.g., outdoor telecom cabinets) where 600 W is insufficient and board space allows larger device. | Choose SMBJ45D-M3/I for space-constrained designs needing 600 W protection; upgrade to SMCJ45A-M3/I only when validated surge energy exceeds SMBJ rating. |
Compared with SMBJ45A-M3/I and SMCJ45A-M3/I, the SMBJ45D-M3/I delivers optimal balance of compact SMB footprint, precise unidirectional clamping, and verified 600 W surge handling - making it the preferred choice for cost-sensitive, space-limited DC rail protection where polarity is fixed and energy levels remain within specification.
Availability
SMBJ45D-M3/I is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and PoE interface protection requiring stable component supply, full M3 compliance traceability, and consistent 45 V clamping performance across production lots.
Supply support for SMBJ45D-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, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting industrial automation, automotive electronics, and communications infrastructure where consistent clamping behavior and long-term stability are mission-critical.
FAQ
What is the breakdown voltage range of the SMBJ45D-M3/I?
The SMBJ45D-M3/I has a guaranteed breakdown voltage (VBR) range of 50.8 V to 54.5 V at 1 mA test current, reflecting its ±3.5 % tolerance. This tight specification ensures consistent clamping onset across units and simplifies margin analysis in safety-critical designs. The SMBJ45D-M3/I maintains this VBR stability over temperature and lifetime under specified surge conditions.
Does the SMBJ45D-M3/I support lead-free reflow soldering?
Yes, the SMBJ45D-M3/I is rated for MSL Level 1 per J-STD-020 with a maximum peak reflow temperature of 260 °C, fully compatible with standard lead-free soldering profiles. Its M3 suffix confirms halogen-free, RoHS-compliant materials and JESD 201 Class 2 whisker resistance - eliminating preconditioning requirements and ensuring process robustness in high-volume SMT lines.
How does the SMBJ45D-M3/I compare to the SMBJ45A-M3/I in terms of electrical behavior?
The SMBJ45D-M3/I is unidirectional with cathode-band marking and 0.5 μA reverse leakage at 45 V, while the SMBJ45A-M3/I is bidirectional with symmetrical clamping and higher leakage. Both share identical VWM (45 V) and VC (71.6 V), but the SMBJ45D-M3/I provides superior DC efficiency and lower parasitic capacitance - making it ideal for fixed-polarity power rail protection where the SMBJ45D-M3/I is deployed.
What is the maximum clamping voltage of the SMBJ45D-M3/I under surge conditions?
The SMBJ45D-M3/I exhibits a maximum clamping voltage (VC) of 71.6 V at 8.4 A peak pulse current (IPPM) using the 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transients and is validated per ANSI/IEEE C62.35 standards. Designers use this VC to verify that downstream components remain within their absolute maximum ratings when the SMBJ45D-M3/I is active.
Can the SMBJ45D-M3/I be used in automotive applications?
Yes, the SMBJ45D-M3/I is qualified for automotive body electronics including BCMs and lighting control units. Its –55 °C to +150 °C operating range, AEC-Q200 alignment via Vishay's qualification program, M3-grade reliability, and proven performance against ISO 7637-2 Pulse 5a make it suitable for 12 V/48 V system protection. The SMBJ45D-M3/I is widely deployed in production automotive modules requiring certified transient suppression.
SMBJ45D-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):
- 45V
- Voltage - Breakdown (Min):
- 50.8V
- Voltage - Clamping (Max) @ Ipp:
- 71.6V
- Current - Peak Pulse (10/1000µs):
- 8.4A
- 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)
SMBJ45D-M3/I FAQ
1.How can I place an order for SMBJ45D-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45D-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 SMBJ45D-M3/I reliable?
The price and inventory of SMBJ45D-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 SMBJ45D-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ45D-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45D-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45D-M3/I?
SMBJ45D-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45D-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 SMBJ45D-M3/I?
For technical support, including SMBJ45D-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45D-M3/I requirements.
6.How does Aetrix verify that SMBJ45D-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ45D-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 SMBJ45D-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ45D-M3/I?
All SMBJ45D-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45D-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 SMBJ45D-M3/I part is unused and in its original packaging.
Return procedure for SMBJ45D-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45D-M3/I Tags
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Diodes Incorporated
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