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Vishay General Semiconductor - Diodes Division SMBJ45AHE3/5B
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- Part No.:
- SMBJ45AHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45AHE3/5B.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,829
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Product details
Overview
SMBJ45AHE3/5B 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 DC power rails and signal lines. 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 in industrial motor drives to safeguard MOSFET gate drivers against inductive switching transients.
For engineers reviewing the SMBJ45AHE3/5B datasheet, SMBJ45AHE3/5B pinout, SMBJ45AHE3/5B application, or SMBJ45AHE3/5B equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (–55 to +150 °C), and RoHS-compliant packaging details - all critical for automotive-grade ESD/surge co-design and PCB layout validation.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: under normal bias it presents <1.0 µA reverse leakage at 45 V, then rapidly avalanches when transient voltage exceeds 50.0 V (min VBR), limiting downstream circuit voltage to ≤72.7 V at 8.3 A surge. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
The device is rated for 100 A non-repetitive forward surge (8.3 ms half-sine), supports automated SMT placement, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and is qualified to AEC-Q101 - confirming suitability for automotive power electronics where reliability under thermal cycling and mechanical stress is mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V systems. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Tight breakdown window ensures predictable turn-on without premature conduction during normal operation. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamping voltage limits protected IC's absolute maximum rating exposure during 10/1000 µs surges. |
| PPPM | 600 W - Peak pulse power handling capability with 0.01% duty cycle; sufficient for IEC 61000-4-5 Level 4 (4 kV) surges. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs derating above 25 °C ambient. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive applications including engine control units, body electronics, and ADAS power supplies. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, cathode indicated by band. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); compliant with UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; completes clamping loop during transient events. |
| Cathode | High-side input terminal | Connected to protected line (e.g., 48 V rail); avalanche conduction occurs from cathode to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity requirements up to Level 4 in compact SMB footprint. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot across protected devices, reducing risk of latch-up or oxide breakdown in downstream ICs. |
| AEC-Q101 qualification (HE3 suffix) | Confirms long-term reliability under automotive temperature cycling, humidity, and mechanical shock conditions. |
| MSL Level 1 moisture sensitivity | Allows direct placement without baking; compatible with standard lead-free reflow profiles up to 260 °C peak. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage drift over time and temperature, critical for safety-critical systems. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protecting 48 V supply inputs of BCM microcontrollers and CAN transceivers from load-dump transients and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between 48 V rail and chassis ground, responding within <1 ns to suppress >100 V spikes. Use Value: Prevents reset corruption and permanent damage to 5 V LDOs and 3.3 V MCU cores during vehicle ignition cycles. |
Use Scenario: Safeguarding 24 V digital input channels of programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input optocoupler terminals, clamping transients before they reach isolation barrier. Use Value: Eliminates false triggering and extends optocoupler lifetime in factory automation environments with frequent contactor switching. |
| Telecom Power Supply Front-End | Motor Drive Gate Driver Protection |
|
Use Scenario: Shielding primary-side DC-DC converter inputs in telecom rectifiers from lightning-induced surges on AC mains feeders. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of bulk capacitors and PFC controllers, absorbing energy before it propagates. Use Value: Reduces need for oversized input capacitors and avoids secondary overvoltage stress on MOSFETs and gate drivers. |
Use Scenario: Clamping gate-source voltage spikes on high-side N-channel MOSFETs in three-phase inverter bridges during fast switching transitions. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly across gate and source terminals to limit dV/dt-induced Miller turn-on. Use Value: Prevents shoot-through failures and improves inverter efficiency by maintaining precise gate control under high dv/dt conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45AHM3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free material compliance is required for end-product environmental certification. | Choose SMBJ45AHM3/5B for EU medical or green industrial equipment where halogen content must be zero. |
| SMAJ45AHE3/A | Same VWM/VBR/VC, but in smaller SMA (DO-214AC) package; lower PPPM (400 W) and higher RθJA (140 °C/W). | Limited to lower-energy transients and less thermally demanding layouts due to reduced power handling and worse thermal performance. | Select SMAJ45AHE3/A only when board space is constrained and surge threat level is below IEC 61000-4-5 Level 3. |
Compared with SMBJ45AHE3/5B, SMBJ45AHM3/5B offers identical protection performance with halogen-free construction, while SMAJ45AHE3/A trades 33 % lower surge capacity and inferior thermal management for 30 % smaller footprint - making SMBJ45AHE3/5B the optimal balance of ruggedness, thermal headroom, and automotive qualification for mid-to-high threat environments.
Availability
SMBJ45AHE3/5B is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, telecom power front-ends, and motor drive gate protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMBJ45AHE3/5B 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure modes must be mitigated without compromising size or thermal performance.
FAQ
What is the maximum clamping voltage of SMBJ45AHE3/5B at its rated peak pulse current?
The SMBJ45AHE3/5B 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 JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings. The SMBJ45AHE3/5B maintains this clamping performance across its full operating temperature range.
Is SMBJ45AHE3/5B qualified for automotive applications?
Yes, SMBJ45AHE3/5B is AEC-Q101 qualified, as confirmed by Vishay's official documentation and ordering code suffix "HE3". This qualification validates its reliability under automotive-grade temperature cycling, mechanical shock, humidity, and lifetime testing - making it suitable for use in engine control units, body control modules, and ADAS power supplies. The SMBJ45AHE3/5B meets all stress test requirements defined in AEC-Q101 Rev D.
What does the "5B" in SMBJ45AHE3/5B indicate?
The "5B" in SMBJ45AHE3/5B denotes the preferred package code specifying 13-inch diameter plastic tape-and-reel delivery with 3200 units per reel. This packaging format is optimized for high-volume SMT assembly lines and ensures consistent feeding accuracy and moisture protection per J-STD-033. The "HE3" portion confirms RoHS compliance and AEC-Q101 qualification, while "5B" governs physical logistics and handling - not electrical or thermal behavior.
How does SMBJ45AHE3/5B differ from bidirectional variants like SMBJ45CA?
SMBJ45AHE3/5B is unidirectional and intended for DC rail protection with polarity-sensitive placement (cathode to line), whereas SMBJ45CA is bidirectional and used in AC or floating signal paths. The SMBJ45AHE3/5B exhibits forward conduction behavior below ~0.7 V and blocks in reverse up to 45 V, while SMBJ45CA clamps symmetrically in both directions. Their VBR and VC values differ accordingly - SMBJ45AHE3/5B is not interchangeable with SMBJ45CA without circuit redesign.
What is the thermal resistance of SMBJ45AHE3/5B, and how does it affect layout?
The SMBJ45AHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB construction and dictates minimum copper area needed to maintain TJ ≤ 150 °C under sustained 5.0 W power dissipation. For high-reliability designs, increasing pad size or adding internal thermal vias reduces effective RθJA and extends surge endurance in repetitive event scenarios.
SMBJ45AHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ45AHE3/5B FAQ
1.How can I place an order for SMBJ45AHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45AHE3/5B 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 SMBJ45AHE3/5B reliable?
The price and inventory of SMBJ45AHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45AHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ45AHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45AHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45AHE3/5B?
SMBJ45AHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45AHE3/5B 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 SMBJ45AHE3/5B?
For technical support, including SMBJ45AHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45AHE3/5B requirements.
6.How does Aetrix verify that SMBJ45AHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ45AHE3/5B 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 SMBJ45AHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ45AHE3/5B?
All SMBJ45AHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45AHE3/5B, 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 SMBJ45AHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ45AHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45AHE3/5B Tags
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