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Vishay General Semiconductor - Diodes Division SMBJ45AHE3/52
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- Part No.:
- SMBJ45AHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45AHE3/52.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,047
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Product details
Overview
SMBJ45AHE3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. 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 - deployed on power rails and signal lines of industrial sensor interfaces and automotive control modules.
For engineers reviewing the SMBJ45AHE3/52 datasheet, SMBJ45AHE3/52 pinout, SMBJ45AHE3/52 application, or SMBJ45AHE3/52 equivalent, key selection criteria include clamping performance under 8.3 A surge, unidirectional polarity for DC-biased protection, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
The SMBJ45AHE3/52 operates as a silicon avalanche diode with glass-passivated junction, delivering fast response time (<1 ns) and low incremental surge resistance to limit transient overvoltage before downstream ICs or MOSFETs are damaged. Its unidirectional configuration enables integration into DC power supply lines where reverse conduction must be blocked.
It meets MSL level 1 per J-STD-020 (peak reflow temperature 260 °C), supports 100 A non-repetitive forward surge current (IFSM), and maintains stable operation across -55 °C to +150 °C junction temperature range - validated for use in automotive ECUs and industrial PLC I/O modules requiring long-term reliability under thermal cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line's nominal DC voltage. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above system operating voltage with margin. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected circuitry. |
| PPPM | 600 W - Peak pulse power handling capability; determines survivability against standardized lightning/surge waveforms. |
| IFSM | 100 A - Single half-sine surge current rating (8.3 ms); validates robustness against motor-switching or relay-coil turn-off events. |
| TJ max | +150 °C - Maximum junction temperature; enables deployment in under-hood automotive or high-ambient industrial environments. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" pads; informs derating requirements for sustained power dissipation. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified (HE3 suffix). Cathode indicated by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to lower-potential side (e.g., ground or return path) in DC protection configurations. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line (e.g., 45 V rail); conducts only during overvoltage events above VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surge (4 kV) without degradation when properly mounted. |
| Glass passivated junction | Ensures stable VBR and low leakage (<1 µA at VWM) over temperature and lifetime. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture-related failure risk. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on protected ICs compared to higher-ratio TVS devices. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed microcontroller power inputs in vehicle body control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp surges exceeding 45 V while blocking reverse current. Use Value: Limits clamped voltage to 72.7 V during 8.3 A surge, preventing damage to 5 V LDO regulators and MCU power pins rated ≤ 75 V absolute maximum. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation systems from ESD and cable-coupled noise. IC Role / Device Role / Timing Role: TVS connected across signal and return paths to absorb sub-100 ns ESD pulses before reaching precision DAC or op-amp inputs. Use Value: Sub-1 ns response time and 72.7 V clamping ensure signal integrity remains intact during ±8 kV contact discharge per IEC 61000-4-2. |
| Telecom DC Power Input Protection | Consumer Device USB Port ESD Suppression |
|
Use Scenario: Safeguarding 48 V PoE-powered network switches against lightning-induced surges entering via Ethernet cables. IC Role / Device Role / Timing Role: Primary TVS on DC input rail upstream of DC/DC converter, configured unidirectionally to avoid interfering with normal bias. Use Value: 600 W pulse rating and 100 A IFSM enable compliance with Telcordia GR-1089-CORE Level 3 surge immunity requirements. |
Use Scenario: Adding secondary-level surge protection on 5 V USB VBUS lines in smart home hubs exposed to user-handled connectors. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 45 V) placed after primary fuse to avoid false triggering during hot-plug inrush. Use Value: 1 µA max leakage at 45 V prevents standby current drain; AEC-Q101 qualification ensures reliability despite non-automotive use case. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45AHM3/52 | Halogen-free, RoHS-compliant, AEC-Q101 qualified - identical electrical specs but different material composition. | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy. | Direct substitution if halogen-free requirement applies; same footprint, thermal, and electrical behavior. |
| SMBJ45A-E3/52 | RoHS-compliant commercial grade (non-AEC-Q101); otherwise identical VWM, VBR, VC, and PPPM. | Not qualified for automotive; suitable for industrial or consumer applications where AEC-Q101 is not required. | Lower-cost option for non-automotive designs; verify qualification requirements before substitution. |
Compared with SMBJ45AHE3/52, the HM3 variant adds halogen-free compliance without altering protection performance, while the E3 variant removes AEC-Q101 validation - making HE3 optimal for automotive-grade reliability, HM3 for eco-regulatory alignment, and E3 for cost-sensitive commercial deployments.
Availability
SMBJ45AHE3/52 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power input stages requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMBJ45AHE3/52 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 engineered for high-energy transient suppression in space-constrained surface-mount applications - targeting automotive, industrial, and communications systems where robustness and repeatability under surge stress are critical.
FAQ
What is the clamping voltage of SMBJ45AHE3/52 at its rated peak pulse current?
The SMBJ45AHE3/52 has a maximum clamping voltage (VC) of 72.7 V at 8.3 A peak pulse current (IPPM) under the standard 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 components remain within their absolute maximum ratings. The SMBJ45AHE3/52 achieves this with low incremental resistance and fast avalanche response.
Is SMBJ45AHE3/52 suitable for automotive applications?
Yes, SMBJ45AHE3/52 is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control units, body electronics, and ADAS sensor modules. The qualification covers stress testing for temperature cycling, humidity, mechanical shock, and surge endurance - all validated per the AEC-Q101 standard. Its SMB package, matte tin terminations, and MSL Level 1 rating further support automotive manufacturing processes.
What is the standoff voltage rating of SMBJ45AHE3/52, and how does it relate to system design?
The SMBJ45AHE3/52 has a reverse stand-off voltage (VWM) of 45 V, meaning it remains non-conductive up to this DC or RMS voltage level. In system design, VWM must exceed the maximum normal operating voltage of the protected line - e.g., used on a 36 V nominal automotive rail with 20 % tolerance (43.2 V), leaving 1.8 V margin before breakdown. This ensures no leakage or power loss during steady-state operation while preserving fast transient response.
Does SMBJ45AHE3/52 have bidirectional capability?
No, SMBJ45AHE3/52 is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only during positive transients on the cathode side relative to anode - appropriate for DC-biased lines like power supplies. For AC or dual-polarity signal lines, a bidirectional variant such as SMBJ45CA would be required; that part is not interchangeable with SMBJ45AHE3/52 due to fundamental polarity and circuit connection differences.
What package type and mounting specifications apply to SMBJ45AHE3/52?
SMBJ45AHE3/52 uses the SMB (DO-214AA) surface-mount package with dimensions 4.57 mm × 3.94 mm × 2.20 mm and matte tin-plated leads. It requires mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated thermal and surge performance. The device meets J-STD-002 and JESD 22-B102 solderability standards and is rated MSL Level 1 for lead-free reflow up to 260 °C peak temperature.
SMBJ45AHE3/52 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)
SMBJ45AHE3/52 FAQ
1.How can I place an order for SMBJ45AHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45AHE3/52 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 SMBJ45AHE3/52 reliable?
The price and inventory of SMBJ45AHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45AHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ45AHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45AHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45AHE3/52?
SMBJ45AHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45AHE3/52 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 SMBJ45AHE3/52?
For technical support, including SMBJ45AHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45AHE3/52 requirements.
6.How does Aetrix verify that SMBJ45AHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ45AHE3/52 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 SMBJ45AHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ45AHE3/52?
All SMBJ45AHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45AHE3/52, 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 SMBJ45AHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ45AHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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