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Vishay General Semiconductor - Diodes Division SMBJ45AHM3_A/I
- Part No.:
- SMBJ45AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45AHM3_A/I.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,757
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Product details
Overview
SMBJ45AHM3_A/I 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 sensitive electronics. It features a 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 8.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in industrial motor drives.
For engineers reviewing the SMBJ45AHM3_A/I datasheet, SMBJ45AHM3_A/I pinout, SMBJ45AHM3_A/I application, or SMBJ45AHM3_A/I equivalent, this page delivers verified electrical parameters, thermal derating behavior, AEC-Q101 qualification status, and real-world clamping performance data essential for surge immunity validation in automotive-grade power interfaces and I/O protection circuits.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its 100 °C/W junction-to-ambient thermal resistance (RθJA) and 20 °C/W junction-to-lead (RθJL) support reliable operation under repetitive surge conditions when mounted on 5.0 mm × 5.0 mm copper pads.
The SMBJ45AHM3_A/I is halogen-free and RoHS-compliant (HM3 suffix), qualified to AEC-Q101 for automotive applications, and rated for -55 °C to +150 °C operating junction temperature. It meets UL 497B recognition (QVGQ2) and J-STD-020 MSL Level 1 moisture sensitivity, enabling lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin above system nominal rail (e.g., 36 V automotive battery). |
| VBR @ IT = 1 mA | 50.0–55.3 V - Breakdown voltage range confirming tight process control; ensures predictable turn-on during transients without premature conduction. |
| VC @ IPPM = 8.3 A | 72.7 V - Clamped voltage under 10/1000 µs surge; limits downstream IC stress to ≤72.7 V during 600 W transient events. |
| PPPM | 600 W - Peak pulse power handling capability; sustains 600 W surges at 0.01% duty cycle without degradation. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports protection against load-dump and inductive kickback. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments and high-ambient industrial enclosures. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place and standard reflow profiles. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return plane; carries full surge current during clamping event. |
| Cathode | Protected line connection / Clamping node | Connected to protected circuit node (e.g., 45 V supply rail); voltage clamps to ≤72.7 V when transient exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges on 45 V systems without cascaded TVS stages. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics where reliability under thermal cycling and vibration is mandatory. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declarations; supports green manufacturing and end-of-life compliance. |
| MSL Level 1 (260 °C peak) | Eliminates pre-bake requirement prior to SMT assembly; reduces production cost and avoids moisture-induced popcorn failure. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients, preserving margin for 75 V-rated MOSFETs and gate drivers. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
|
Use Scenario: Protecting 45 V auxiliary power rails in ADAS ECUs against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery feed and DC-DC input stage. Use Value: Limits transient voltage to ≤72.7 V, preventing damage to 80 V-input buck controllers and ensuring ASIL-B functional safety compliance. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC modules from ESD and switching noise. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) TVS shunting transients on 0–10 V or 4–20 mA signal paths. Use Value: Maintains signal integrity with <1.0 µA leakage at 45 V, avoiding offset errors while clamping ±15 kV contact ESD per IEC 61000-4-2. |
| Telecom DC Power Interface | MOSFET Gate Driver Protection |
|
Use Scenario: Safeguarding -48 V telecom rectifier outputs from lightning-induced surges on central office equipment. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS used in back-to-back configuration across differential DC bus. Use Value: Delivers 600 W surge handling per device with 72.7 V clamping, meeting GR-1089-CORE Level 3 requirements for outdoor plant gear. |
Use Scenario: Preventing gate oxide rupture in high-side N-channel MOSFETs driven by microcontrollers in motor inverters. IC Role / Device Role / Timing Role: Cathode-connected to gate, anode to source; clamps Miller-induced voltage spikes during switching transitions. Use Value: Responds in <1 ns to limit gate-source voltage to ≤72.7 V, protecting 60 V-rated gate oxides without adding propagation delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45AHE3_A/I | Same electrical specs but RoHS-compliant (E3), non-halogen-free; not AEC-Q101 qualified. | Approved for commercial/industrial use only; excluded from automotive Tier-1 BOMs requiring AEC-Q101. | Select SMBJ45AHE3_A/I only for cost-sensitive non-automotive designs where halogen content is unrestricted. |
| SMAJ45A-M3 | Lower 400 W PPPM, SMA (DO-214AC) package (smaller footprint, higher RθJA = 140 °C/W). | Limited to lower-energy transients (IEC 61000-4-5 Level 2); unsuitable for load dump or high-current inductive switching. | Choose SMAJ45A-M3 only for space-constrained consumer electronics with ≤400 W surge exposure and ambient <85 °C. |
Compared with SMBJ45AHM3_A/I, SMBJ45AHE3_A/I lacks automotive qualification and halogen-free status, while SMAJ45A-M3 sacrifices 33% peak power handling and thermal robustness - making SMBJ45AHM3_A/I the sole choice for AEC-Q101-compliant 600 W surge protection in harsh environments.
Availability
SMBJ45AHM3_A/I is available at Aetrix Electronics and suitable for automotive power distribution units, industrial sensor interface modules, telecom DC power supplies, and MOSFET gate driver circuits requiring stable component supply across extended product lifecycles.
Supply support for SMBJ45AHM3_A/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, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in automotive, industrial, and telecom infrastructure - delivering consistent clamping performance, AEC-Q101 validation, and robust thermal design for mission-critical overvoltage protection.
FAQ
What is the maximum clamping voltage of SMBJ45AHM3_A/I under a 10/1000 µs surge?
The SMBJ45AHM3_A/I has a maximum clamping voltage (VC) of 72.7 V at 8.3 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMBJ45AHM3_A/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) with minimal drift.
Is SMBJ45AHM3_A/I qualified for automotive applications?
Yes, SMBJ45AHM3_A/I is AEC-Q101 qualified, as confirmed by the HM3 suffix and footnote (1) in Vishay document 88392. This qualification covers stress testing for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life - validating its suitability for under-hood and chassis-mounted automotive electronics. The SMBJ45AHM3_A/I is explicitly approved for use in powertrain, body control, and ADAS modules requiring certified transient protection.
What does the "HM3" suffix indicate in SMBJ45AHM3_A/I?
The "HM3" suffix in SMBJ45AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information table, HM3 devices meet JESD 201 Class 2 whisker resistance, UL 94 V-0 flammability, and JEDEC moisture sensitivity level (MSL) 1 - allowing peak reflow temperatures up to 260 °C without preconditioning. This distinguishes SMBJ45AHM3_A/I from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS, non-halogen-free) variants.
Can SMBJ45AHM3_A/I be used in bidirectional protection configurations?
No, SMBJ45AHM3_A/I is a unidirectional TVS diode, as indicated by its "A" suffix and cathode-band marking. For bidirectional protection, Vishay specifies the "CA" suffix (e.g., SMBJ45CA). Using SMBJ45AHM3_A/I in reverse-biased mode risks permanent junction damage due to lack of symmetrical breakdown characteristics. The SMBJ45AHM3_A/I must be oriented with cathode toward the protected line and anode to ground or low-impedance return.
What is the thermal resistance of SMBJ45AHM3_A/I, and how does it affect layout?
SMBJ45AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under repetitive surges, PCB layout must provide minimum pad dimensions matching Vishay's recommended mounting footprint and avoid thermal isolation. Reducing copper area increases RθJA, risking thermal runaway during high-duty-cycle transients.
SMBJ45AHM3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ45AHM3_A/I FAQ
1.How can I place an order for SMBJ45AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45AHM3_A/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 SMBJ45AHM3_A/I reliable?
The price and inventory of SMBJ45AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ45AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45AHM3_A/I?
SMBJ45AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45AHM3_A/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 SMBJ45AHM3_A/I?
For technical support, including SMBJ45AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45AHM3_A/I requirements.
6.How does Aetrix verify that SMBJ45AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ45AHM3_A/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 SMBJ45AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ45AHM3_A/I?
All SMBJ45AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45AHM3_A/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 SMBJ45AHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ45AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45AHM3_A/I Tags
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