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Vishay General Semiconductor - Diodes Division SMBJ45AHM3/I
- Part No.:
- SMBJ45AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45AHM3/I.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,135
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Product details
Overview
SMBJ45AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1.0 mA test current, 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ45AHM3/I datasheet, SMBJ45AHM3/I pinout, SMBJ45AHM3/I application, or SMBJ45AHM3/I equivalent, this part delivers verified transient suppression for 45 V DC rails with halogen-free, RoHS-compliant construction, AEC-Q101 qualification readiness, and MSL Level 1 moisture sensitivity - critical for automotive-grade board-level ESD and surge protection design.
Technical Context
This unidirectional TVS operates as a voltage-clamping device that remains high-impedance below 45 V and rapidly avalanches above its 50.0–55.3 V breakdown threshold to limit transient energy. Its low incremental surge resistance and sub-nanosecond response time ensure effective suppression of inductive switching spikes and lightning-induced surges.
The SMBJ45AHM3/I uses a glass-passivated silicon junction housed in an SMB (DO-214AA) package with matte tin-plated leads, rated for 150 °C maximum junction temperature and compliant with JESD201 Class 2 whisker resistance. It supports repetitive 0.01% duty cycle pulses and meets UL 94 V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 48 V systems. |
| VBR (min/max) | 50.0 V / 55.3 V at 1.0 mA - Confirmed breakdown range ensures reliable triggering without premature leakage or delayed clamping. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamping voltage under 10/1000 µs surge defines worst-case overvoltage seen by protected downstream circuitry. |
| PPPM | 600 W - Peak pulse power handling capacity determines survivability against standardized lightning/surge waveforms (IEC 61000-4-5). |
| IFSM | 100 A - Non-repetitive forward surge current rating validates robustness during accidental polarity reversal events. |
| TJ max. | +150 °C - Maximum junction temperature enables operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated placement. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional configuration with cathode band marking. Dimensions: 5.59 mm × 4.06 mm × 2.20 mm (L × W × H); terminals are matte tin-plated, solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side reference | Connected to ground or lower-potential node; establishes reference for clamping action when cathode is at higher potential. |
| Cathode | Reverse-biased terminal / clamping output | Connected to protected line (e.g., 45 V rail); avalanche conduction occurs here during overvoltage to shunt surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validated surge handling for IEC 61000-4-5 Level 3/4 compliance in industrial and automotive power inputs. |
| Halogen-free, RoHS-compliant (HM3 suffix) | Meets global environmental regulations and enables use in green manufacturing without compromising thermal or electrical performance. |
| AEC-Q101 qualified option available | Supports automotive-grade reliability validation path; HM3 variant is halogen-free and qualified per AEC-Q101 when ordered with HE3/HM3 suffixes. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without moisture-related popcorn failure or delamination risk. |
| Low incremental surge resistance | Minimizes VC rise under high-current transients, preserving tighter voltage margins for sensitive 3.3 V or 5 V logic downstream. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Suppresses load-dump and alternator ripple transients on 45 V auxiliary power rails feeding microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between input rail and ground, triggered within <1 ns upon overvoltage detection. Use Value: Limits peak voltage to ≤72.7 V during 8.3 A surge, preventing latch-up or gate oxide damage in downstream 48 V-rated FET drivers and PMICs. |
Use Scenario: Protects LIN bus interface and sensor supply lines in door modules exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Standby-mode voltage clamp on 12 V–45 V distributed supply nodes, activated only during transient excursions beyond VWM. Use Value: Maintains system uptime by absorbing >600 W surge energy without degradation, meeting ISO 16750-2 pulse 5a requirements. |
| Telecom DC Power Input Stage | Motor Drive Gate Driver Protection |
|
Use Scenario: Shields PoE-powered equipment front-end regulators from induced surges on 48 V DC input derived from midspan injectors. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input prior to DC/DC converter; coordinates with upstream fuse for coordinated protection. Use Value: Clamps to 72.7 V within nanoseconds, ensuring input capacitors and controller ICs remain within absolute maximum ratings during lightning-induced surges. |
Use Scenario: Safeguards high-side and low-side gate driver ICs from Miller-induced voltage spikes during IGBT/MOSFET switching in BLDC inverters. IC Role / Device Role / Timing Role: Localized rail clamp on isolated 15–20 V gate supply, placed adjacent to driver IC VDD pin. Use Value: Prevents gate oxide breakdown by limiting transient overshoot to <73 V, enabling reliable 100 kHz+ switching in industrial motor drives. |
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-M3/5B | Same electrical specs, but uses standard RoHS-compliant (non-halogen-free) molding compound; no AEC-Q101 qualification path. | Preferred for commercial-grade telecom or computing applications where halogen content is unrestricted. | Select when cost sensitivity outweighs halogen-free requirement and automotive qualification is unnecessary. |
| SMCJ45A-HM3 | Same VWM/VC, but in larger SMC (DO-214AB) package with 1500 W PPPM; higher thermal mass and lower RθJA (50 °C/W vs. 100 °C/W). | Better suited for high-energy surge environments (e.g., outdoor AC/DC converters) requiring extended pulse handling. | Choose when system-level surge testing exceeds 600 W or board layout allows larger footprint for improved thermal derating. |
Compared with SMBJ45AHM3/I, SMBJ45A-M3/5B offers identical clamping performance at lower cost but lacks halogen-free certification, while SMCJ45A-HM3 provides 2.5× higher surge power handling in a larger package - making SMBJ45AHM3/I the optimal balance of compact size, environmental compliance, and validated 600 W protection for space-constrained 45 V rail designs.
Availability
SMBJ45AHM3/I is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom DC inputs, and motor drive gate driver protection requiring stable component supply across long-lifecycle programs.
Supply support for SMBJ45AHM3/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 was developed for robust, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where compact size, high surge capability, and process compatibility are essential.
FAQ
What is the maximum clamping voltage of SMBJ45AHM3/I under a 10/1000 µs surge?
The SMBJ45AHM3/I has a maximum clamping voltage (VC) of 72.7 V at 8.3 A peak pulse current with a 10/1000 µs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components like 75 V-rated MOSFETs remain within safe operating area. The SMBJ45AHM3/I maintains this clamping performance across its full operating temperature range.
Is SMBJ45AHM3/I suitable for automotive applications?
Yes - the SMBJ45AHM3/I is halogen-free and RoHS-compliant, and it belongs to the AEC-Q101-qualified SMBJ family; ordering with HM3 suffix confirms compliance with automotive reliability standards when paired with appropriate qualification codes (e.g., HM3_B/I). Its 150 °C junction rating, MSL Level 1 reflow compatibility, and robust surge handling make SMBJ45AHM3/I appropriate for body control modules, infotainment power rails, and ADAS sensor interfaces.
How does the HM3 suffix differ from E3 or M3 in SMBJ45AHM3/I?
The HM3 suffix in SMBJ45AHM3/I denotes halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance and AEC-Q101 qualification eligibility - distinguishing it from E3 (RoHS-compliant, commercial grade) and M3 (halogen-free, RoHS-compliant, commercial grade only). The "I" denotes 13-inch tape-and-reel packaging (3200 units/reel), confirming factory-standard logistics configuration for high-volume SMT assembly of SMBJ45AHM3/I.
What is the standoff voltage rating for SMBJ45AHM3/I?
The standoff voltage (VWM) for SMBJ45AHM3/I is 45 V - the maximum DC or continuous reverse voltage the device can withstand without entering avalanche conduction. This rating ensures compatibility with nominal 48 V systems where derating is applied, and guarantees minimal leakage (<1.0 µA) at operating temperature, preserving efficiency in always-on circuits. The SMBJ45AHM3/I's VWM is strictly defined and tested per ANSI/IEEE C62.35 standards.
Does SMBJ45AHM3/I have bidirectional capability?
No - SMBJ45AHM3/I is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only in reverse bias (cathode positive relative to anode) and must be oriented accordingly in-circuit. Bidirectional variants use the "CA" suffix (e.g., SMBJ45CA); selecting SMBJ45AHM3/I for AC-coupled or floating signal lines would require external design adaptation or substitution with a CA-series part.
SMBJ45AHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMBJ45AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45AHM3/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/I reliable?
The price and inventory of SMBJ45AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMBJ45AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45AHM3/I?
SMBJ45AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45AHM3/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/I?
For technical support, including SMBJ45AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45AHM3/I requirements.
6.How does Aetrix verify that SMBJ45AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ45AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMBJ45AHM3/I?
All SMBJ45AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45AHM3/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/I part is unused and in its original packaging.
Return procedure for SMBJ45AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45AHM3/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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