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Vishay General Semiconductor - Diodes Division SMBJ45AHE3_B/H
- Part No.:
- SMBJ45AHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45AHE3_B/H.pdf
- Description:
- 600W,45V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,213
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Product details
Overview
SMBJ45AHE3_B/H 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 stand-off 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ45AHE3_B/H datasheet, SMBJ45AHE3_B/H pinout, SMBJ45AHE3_B/H application, or SMBJ45AHE3_B/H equivalent, this part is selected for robust overvoltage protection where fast response (<1 ps), low clamping ratio (VC/VBR ≈ 1.45), AEC-Q101 qualification, and RoHS-compliant matte tin terminations are required in automotive and industrial designs.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response and stable breakdown under repetitive surge conditions. Its thermal resistance (RθJA = 100 °C/W) and junction temperature range (–55 °C to +150 °C) support operation in high-ambient environments when mounted on 5.0 mm × 5.0 mm copper pads.
The device complies with ANSI/IEEE C62.35 for surge protection and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. The cathode band marking identifies polarity, and its 1.0 µA max reverse leakage at VWM ensures minimal standby power loss in always-on circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 36–42 V nominal systems. |
| VBR min/max | 50.0 V / 55.3 V at IT = 1 mA - Confirmed breakdown window ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamping voltage during 10/1000 µs surge; limits downstream voltage stress to <73 V under worst-case 600 W transient. |
| PPPM | 600 W - Peak pulse power handling capability with 0.01% duty cycle; supports repeated lightning/surge events per IEC 61000-4-5. |
| IFSM | 100 A - Non-repetitive forward surge rating (8.3 ms half-sine); enables protection against inductive switch-off spikes in DC motor drives. |
| Junction Temp | –55 °C to +150 °C - Full operational range allows deployment in under-hood automotive or industrial control cabinets without derating. |
| Leakage @ VWM | 1.0 µA max - Ultra-low reverse current preserves battery life and avoids false triggering in low-power sensor nodes. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by molded band.
| 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 / Clamp reference | Connected to line being protected (e.g., 48 V rail); voltage referenced to anode during avalanche conduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics requiring reliability under thermal cycling and vibration. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-to-line) without degradation when properly mounted on recommended copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients, reducing risk of gate oxide damage in protected MOSFETs and ICs. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with high-volume automated assembly lines using 260 °C peak profile. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage performance across humidity, temperature, and lifetime stress tests. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between supply rail and chassis ground to shunt >100 V spikes within nanoseconds. Use Value: Limits voltage seen by downstream PMICs and microcontrollers to ≤72.7 V, preventing latch-up or permanent damage during ISO 16750-2 pulses. |
Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across differential signal pair (e.g., RS-485 bus) to absorb ESD and EFT bursts. Use Value: Maintains signal integrity with <1.0 µA leakage at 45 V, avoiding DC offset errors while clamping ±15 kV contact ESD per IEC 61000-4-2. |
| DC Motor Drive Output Stage | Telecom Power Supply Input |
|
Use Scenario: Suppressing inductive kickback from brushed DC motors in robotic actuators. IC Role / Device Role / Timing Role: Mounted across H-bridge output terminals to clamp flyback voltage during PWM switching transitions. Use Value: Handles 100 A single-half-sine surge (IFSM) without failure, enabling reliable operation in 24–48 V motor control systems. |
Use Scenario: Front-end protection for AC/DC converters in telecom base station power modules. IC Role / Device Role / Timing Role: Primary surge suppression stage before input rectifier and bulk capacitor, rated for repeated 600 W transients. Use Value: Provides 600 W peak pulse power handling with 100 °C/W thermal resistance, enabling compact layout without heatsinking in 19" rack power supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45AHM3_B/H | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free compliance is mandated by OEM environmental policy. | Direct material substitution when halogen-free bill-of-materials is required; same footprint and thermal behavior. |
| SMCJ45AHE3_A/H | Same VWM, VBR, and VC, but in larger SMC (DO-214AB) package with 1500 W PPPM rating. | Used where higher surge energy absorption is needed (e.g., outdoor telecom equipment), accepting larger PCB area. | Choose when system-level surge testing exceeds 600 W; requires PCB layout change due to larger 7.11 mm × 6.22 mm footprint. |
Compared with SMBJ45AHE3_B/H, the HM3 variant offers identical protection performance with halogen-free construction, while the SMCJ45AHE3_A/H delivers 2.5× higher surge energy capacity at the cost of increased board space and thermal mass - enabling trade-offs between density and ruggedness in final design.
Availability
SMBJ45AHE3_B/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, DC motor drives, and telecom power supplies requiring stable component supply with AEC-Q101 assurance and RoHS compliance.
Supply support for SMBJ45AHE3_B/H 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, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-speed transient suppression in automotive, industrial, and communications systems - delivering consistent clamping performance, AEC-Q101 validation, and robust packaging for harsh-environment deployment.
FAQ
What is the breakdown voltage tolerance for SMBJ45AHE3_B/H?
The SMBJ45AHE3_B/H has a specified breakdown voltage (VBR) range of 50.0 V to 55.3 V at test current IT = 1 mA, per Vishay Document 88392 Rev. 09-Jan-2024. This ±5.5% tolerance ensures reliable turn-on across manufacturing lots and temperature extremes, critical for consistent overvoltage protection in safety-critical systems.
Is SMBJ45AHE3_B/H suitable for bidirectional signal line protection?
No - SMBJ45AHE3_B/H is a unidirectional TVS diode, marked with a cathode band and intended for DC rail or polarized signal protection. For bidirectional applications such as AC lines or differential buses, use the CA-suffix variant (e.g., SMBJ45CA) which provides symmetrical clamping in both directions.
Does SMBJ45AHE3_B/H require a heatsink in typical applications?
No external heatsink is required for SMBJ45AHE3_B/H under standard surge conditions. Its RθJA = 100 °C/W assumes mounting on 5.0 mm × 5.0 mm copper pads per datasheet Fig. 2. Continuous power dissipation is limited to 5.0 W; thermal design focuses on PCB copper area rather than added heatsinking.
What is the surge current rating of SMBJ45AHE3_B/H at 10/1000 µs waveform?
At the standardized 10/1000 µs double-exponential surge waveform, SMBJ45AHE3_B/H delivers 8.3 A peak pulse current (IPPM) corresponding to its 600 W peak pulse power rating. This value is confirmed in the Electrical Characteristics table of Vishay Document 88392 and applies at TA = 25 °C with proper PCB layout.
How does the AEC-Q101 qualification impact SMBJ45AHE3_B/H usage in automotive designs?
The AEC-Q101 qualification of SMBJ45AHE3_B/H validates its reliability for automotive applications including powertrain, chassis, and body electronics. It confirms passing stress tests for temperature cycling, humidity, mechanical shock, and surge endurance - enabling direct use in production ECUs without additional qualification effort by the system integrator.
SMBJ45AHE3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- 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)
SMBJ45AHE3_B/H FAQ
1.How can I place an order for SMBJ45AHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45AHE3_B/H 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 SMBJ45AHE3_B/H reliable?
The price and inventory of SMBJ45AHE3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45AHE3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ45AHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45AHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45AHE3_B/H?
SMBJ45AHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45AHE3_B/H 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 SMBJ45AHE3_B/H?
For technical support, including SMBJ45AHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45AHE3_B/H requirements.
6.How does Aetrix verify that SMBJ45AHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ45AHE3_B/H 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 SMBJ45AHE3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ45AHE3_B/H?
All SMBJ45AHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45AHE3_B/H, 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 SMBJ45AHE3_B/H part is unused and in its original packaging.
Return procedure for SMBJ45AHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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