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Vishay General Semiconductor - Diodes Division SMBJ45CAHE3_A/I
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- Part No.:
- SMBJ45CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CAHE3_A/I.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,751
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Product details
Overview
SMBJ45CAHE3_A/I from Vishay General Semiconductor is a bidirectional 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 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 (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in industrial sensor interfaces and telecom infrastructure.
For engineers reviewing the SMBJ45CAHE3_A/I datasheet, SMBJ45CAHE3_A/I pinout, SMBJ45CAHE3_A/I application, or SMBJ45CAHE3_A/I equivalent, this device is evaluated for ESD/surge immunity in bidirectional AC-coupled circuits, automotive-grade transient suppression per AEC-Q101, PCB layout compatibility with 0.2" × 0.2" copper pads, and thermal derating above 25 °C ambient.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping behavior during positive and negative transients. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling consistent response to repetitive 10/1000 µs surges at 0.01% duty cycle.
The device is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101, supporting automotive and industrial applications requiring high-reliability transient suppression without polarity sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below breakdown. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown threshold range ensuring predictable turn-on under surge conditions. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamped voltage during 10/1000 µs transient; determines maximum stress imposed on protected downstream circuitry. |
| PPPM | 600 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 surge immunity when properly mounted. |
| ID @ VWM | 1.0 µA - Reverse leakage at stand-off voltage; negligible power loss and minimal impact on high-impedance signal integrity. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures. |
| Package | SMB (DO-214AA) - Surface-mount outline with 0.205" × 0.130" footprint; compatible with automated placement and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Provides low-impedance conduction path during negative-going surges; electrically identical to cathode in CA devices. |
| Cathode | Transient return path (bidirectional) | Provides low-impedance conduction path during positive-going surges; functionally interchangeable with anode in SMBJ45CAHE3_A/I. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR (50.0–55.3 V) and VC (72.7 V) in both directions - eliminates need for polarity-aware layout in AC or floating signal lines. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - suitable for ADAS sensor modules and body control units. |
| 600 W 10/1000 µs pulse rating | Withstands IEC 61000-4-5 combined wave surges up to 4 A (line-to-ground) or 2 A (line-to-line) without degradation when mounted per recommended pad layout. |
| MSL Level 1 moisture sensitivity | Unlimited floor life at ≤30 °C/60% RH - allows direct use from reel without baking, reducing manufacturing overhead. |
| Glass passivated junction | Stable leakage (<1 µA) and VBR drift (<0.102 %/°C) over time and temperature - critical for long-life industrial deployments. |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting RS-485 transceivers and analog sensor outputs (e.g., 4–20 mA loops) against EFT and lightning-induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential pair or supply rail to limit transient excursions within IC absolute maximum ratings. Use Value: Maintains signal integrity by clamping transients to ≤72.7 V while drawing <1 µA at 45 V - avoids loading precision analog paths. |
Use Scenario: Shielding Ethernet PHYs and DSL line drivers from induced surges on twisted-pair telecom lines exposed to outdoor environments. IC Role / Device Role / Timing Role: Primary-level surge suppressor located at board edge, shunting energy before it reaches isolation transformers or PHY ICs. Use Value: 600 W pulse rating handles repeated 10/1000 µs surges per IEC 61000-4-5; SMB footprint enables dense placement near connectors. |
| Automotive Body Control Module | Consumer Power Adapter Input Stage |
|
Use Scenario: Safeguarding microcontroller I/O and LIN bus transceivers against load dump and ISO 7637-2 pulses in vehicle interior modules. IC Role / Device Role / Timing Role: Secondary protection element downstream of fuse and primary TVS, absorbing residual energy after bulk clamping. Use Value: AEC-Q101 qualification ensures compliance with automotive reliability standards; +150 °C TJ rating supports under-dash mounting. |
Use Scenario: Suppressing switching noise and line surges on AC-DC adapter input rectifier outputs feeding SMPS controllers. IC Role / Device Role / Timing Role: Fast-response clamp limiting voltage spikes across bulk capacitor and controller VDD rail during MOSFET turn-off events. Use Value: 72.7 V clamping prevents overvoltage shutdown of PWM controllers; low leakage avoids standby power penalty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CA-M3/5B | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification; differs only in plating composition (HM3 vs HE3). | No functional difference in surge performance or thermal behavior; selected where halogen-free compliance is mandated by OEM spec. | Choose SMBJ45CA-M3/5B if halogen-free materials are required; otherwise SMBJ45CAHE3_A/I offers same reliability with standard matte tin plating. |
| SMCJ45CAHE3_A/I | Same VWM/VBR/VC specs but in larger SMC (DO-214AB) package; higher thermal mass yields lower RθJA (50 °C/W vs 100 °C/W) and higher IPPM (13.9 A vs 8.3 A). | Better suited for high-energy surge environments (e.g., outdoor telecom cabinets); requires larger PCB area and different pad layout. | Select SMBJ45CAHE3_A/I for space-constrained designs needing 600 W protection in minimal footprint; choose SMCJ45CAHE3_A/I when higher single-pulse energy handling is critical. |
Compared with SMBJ45CA-M3/5B, SMBJ45CAHE3_A/I provides identical surge performance with standard RoHS plating; versus SMCJ45CAHE3_A/I, it trades 47% lower peak surge current capacity for 44% smaller PCB area - optimizing for density over energy headroom.
Availability
SMBJ45CAHE3_A/I is available at Aetrix Electronics and suitable for industrial sensor interface, telecom line protection, automotive body control module, and consumer power adapter input stage applications requiring stable component supply and AEC-Q101 traceability.
Supply support for SMBJ45CAHE3_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 was engineered for high-power, surface-mount transient suppression in space-constrained industrial and automotive systems - balancing clamping precision, surge endurance, and manufacturability in the SMB package.
FAQ
What does the "CA" suffix indicate in SMBJ45CAHE3_A/I?
The "CA" suffix denotes a bidirectional configuration: SMBJ45CAHE3_A/I clamps voltage transients equally in both polarities, unlike unidirectional variants (e.g., SMBJ45A). This makes it ideal for AC-coupled signal lines, transformer-isolated interfaces, and floating power domains where polarity cannot be assumed. The device has no cathode band marking, confirming its symmetrical construction.
Is SMBJ45CAHE3_A/I qualified for automotive applications?
Yes, SMBJ45CAHE3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation (Document Number 88392, Revision 09-Jan-2024). It undergoes stress testing for temperature cycling, high-temperature reverse bias, and surge endurance - meeting requirements for use in body control modules, infotainment systems, and ADAS sensor nodes.
What is the maximum clamping voltage of SMBJ45CAHE3_A/I and how is it measured?
The maximum clamping voltage (VC) of SMBJ45CAHE3_A/I is 72.7 V, measured at a peak pulse current (IPPM) of 8.3 A using the standardized 10/1000 µs double-exponential waveform. This value represents the highest voltage that appears across the device during worst-case surge conditions - a critical parameter for ensuring protected ICs remain within their absolute maximum voltage ratings.
How does the SMB (DO-214AA) package of SMBJ45CAHE3_A/I affect thermal performance?
The SMB package delivers RθJA = 100 °C/W and RθJL = 20 °C/W when mounted on 0.2" × 0.2" copper pads per Vishay's recommended layout. This thermal profile supports continuous power dissipation up to 5.0 W at 50 °C ambient, but requires derating above that temperature - for example, to ~3.5 W at 75 °C ambient - making board-level copper area and airflow key design considerations for sustained surge duty cycles.
Can SMBJ45CAHE3_A/I replace unidirectional TVS diodes like SMBJ45A in existing designs?
No - SMBJ45CAHE3_A/I is bidirectional and lacks polarity marking, whereas SMBJ45A is unidirectional with a cathode band. Substituting them requires verifying circuit topology: SMBJ45CAHE3_A/I is appropriate for AC or floating nodes, but will not provide correct forward conduction in DC-biased unidirectional paths (e.g., supply rail to ground). Layout and schematic review is mandatory before replacement.
SMBJ45CAHE3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ45CAHE3_A/I FAQ
1.How can I place an order for SMBJ45CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CAHE3_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 SMBJ45CAHE3_A/I reliable?
The price and inventory of SMBJ45CAHE3_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 SMBJ45CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ45CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CAHE3_A/I?
SMBJ45CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CAHE3_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 SMBJ45CAHE3_A/I?
For technical support, including SMBJ45CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CAHE3_A/I requirements.
6.How does Aetrix verify that SMBJ45CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ45CAHE3_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 SMBJ45CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ45CAHE3_A/I?
All SMBJ45CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CAHE3_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 SMBJ45CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMBJ45CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45CAHE3_A/I Tags
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