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Vishay General Semiconductor - Diodes Division SMBJ45CAHE3/52
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- Part No.:
- SMBJ45CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CAHE3/52.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,846
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Product details
Overview
SMBJ45CAHE3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power 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 (IPPM), and 600 W peak pulse power (10/1000 μs waveform), commonly deployed to protect MOSFETs, sensor interfaces, and communication lines in industrial power supplies.
For engineers reviewing the SMBJ45CAHE3/52 datasheet, SMBJ45CAHE3/52 pinout, SMBJ45CAHE3/52 application, or SMBJ45CAHE3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (–55 to +150 °C), and compliance with UL 497B surge protector classification.
Technical Context
This device operates as a voltage-clamped avalanche diode, responding within <1 ps to transient overvoltages and limiting reverse voltage across protected circuitry to ≤72.7 V under 8.3 A 10/1000 μs surge conditions. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating need for polarity-aware placement in AC-coupled or differential signal paths.
Designed for surface-mount assembly on PCBs with minimum 5.0 mm × 5.0 mm copper pads per terminal, it delivers 600 W peak pulse power dissipation while maintaining low incremental surge resistance and stable clamping performance across –55 °C to +150 °C operating junction temperature. The glass-passivated junction and matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit of normal signal swing in protected line. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Breakdown onset range; ensures reliable conduction onset above system operating voltage with margin. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs or MOSFETs. |
| PPPM | 600 W - Peak pulse power handling capacity; enables protection against IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source). |
| ID @ VWM | 1.0 μA - Reverse leakage at stand-off voltage; negligible loading on high-impedance sensor or bias networks. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in enclosed industrial enclosures or near heat-generating components. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard pad layout; informs derating needed for sustained power dissipation. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking; case outline conforms to JEDEC DO-214AA standard (5.59 mm × 4.06 mm × 2.44 mm), UL 94 V-0 rated molding compound, matte tin-plated terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Transient conduction path (bidirectional) | Both terminals function identically; avalanche conduction occurs symmetrically regardless of voltage polarity applied. |
| Anode (Cathode) | Transient conduction path (bidirectional) | No functional distinction between terminals; device mounts without orientation constraint in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for under-hood and ADAS sensor protection. |
| 600 W peak pulse power (10/1000 μs) | Withstands repeated lightning-induced surges per IEC 61000-4-5 up to 4 kV open-circuit voltage with 2 Ω source impedance. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients, reducing risk of gate oxide damage in protected MOSFETs or logic inputs. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT reflow profiles without preconditioning or special handling. |
| Glass-passivated junction | Ensures long-term stability of breakdown characteristics and low parameter drift over temperature and lifetime. |
Applications
| Industrial Motor Drives | Automotive Sensor Interfaces |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback signal lines in variable-frequency drives exposed to inductive switching noise and load dump events. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry or IC input pins to shunt surge energy before reaching control logic. Use Value: Limits transient voltage to ≤72.7 V during 8.3 A surges, preventing latch-up or permanent damage to isolated gate drivers and analog front-ends. |
Use Scenario: ESD and load-dump protection for CAN/LIN bus transceivers and MEMS pressure/temperature sensors in engine control units. IC Role / Device Role / Timing Role: Primary surge suppression device mounted adjacent to connector or transceiver IC, leveraging bidirectional symmetry for differential bus protection. Use Value: Maintains signal integrity during ISO 16750-2 load dump (12 V systems) and IEC 61000-4-2 ESD (±15 kV air) without polarity-sensitive routing. |
| Telecom Power Feeds | Consumer USB-C PD Ports |
|
Use Scenario: Overvoltage protection on 48 V DC power distribution lines feeding remote radio units or PoE-powered equipment. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of DC-DC converters to clamp induced surges from nearby lightning strikes or cable coupling. Use Value: Withstands 600 W pulses without degradation, enabling compliance with ITU-T K.20/21 immunity requirements for outdoor telecom infrastructure. |
Use Scenario: Secondary-level surge protection on VBUS and CC lines of USB-C ports supporting Power Delivery up to 100 W. IC Role / Device Role / Timing Role: Fast-response clamping device supplementing primary protection (e.g., polymer PTC + GDT), placed near port connector. Use Value: Sub-1 ps response time and 72.7 V clamping prevent overvoltage damage to USB PD controllers and port multiplexers during hot-plug transients. |
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-M3/52 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification; same SMB package and thermal performance. | No functional difference in circuit protection; selected when halogen-free material compliance is mandated by OEM environmental policy. | Choose SMBJ45CA-M3/52 if halogen-free construction is required; otherwise SMBJ45CAHE3/52 offers identical protection with standard RoHS compliance. |
| SMCJ45CAHE3/52 | Higher-power 1500 W version in larger SMC (DO-214AB) package; same VWM (45 V), VBR (50–55.3 V), and VC (72.7 V), but higher IPPM (22.5 A). | Used where higher surge repetition rate or longer-duration transients exceed SMBJ45CAHE3/52's 600 W rating; requires larger PCB footprint and thermal management. | Select SMCJ45CAHE3/52 only when 600 W is insufficient; SMBJ45CAHE3/52 remains optimal for space-constrained designs with typical IEC 61000-4-5 Level 3–4 requirements. |
Compared with SMBJ45CA-M3/52, SMBJ45CAHE3/52 provides identical surge protection performance with standard RoHS compliance, while SMCJ45CAHE3/52 trades compact SMB packaging for 2.5× higher pulse power - making SMBJ45CAHE3/52 the preferred choice for cost-sensitive, space-limited industrial and automotive PCBs requiring AEC-Q101 validation.
Availability
SMBJ45CAHE3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive sensor interfaces, telecom power feeds, and consumer USB-C PD ports requiring stable component supply, AEC-Q101 qualification, and consistent TVS performance across production batches.
Supply support for SMBJ45CAHE3/52 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is part of Vishay's TRANSZORB® TVS portfolio, engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated.
FAQ
What does the "CA" suffix indicate in SMBJ45CAHE3/52?
The "CA" suffix in SMBJ45CAHE3/52 denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression for both positive and negative polarity surges. Unlike unidirectional variants (e.g., SMBJ45A), SMBJ45CAHE3/52 has no cathode band marking and functions identically regardless of voltage polarity applied across its terminals - essential for protecting AC-coupled lines, differential buses like CAN, or circuits where polarity reversal is possible.
Is SMBJ45CAHE3/52 suitable for automotive applications?
Yes, SMBJ45CAHE3/52 is AEC-Q101 qualified, having passed rigorous stress tests including temperature cycling, highly accelerated life testing (HALT), and ESD verification per JESD22-A114. Its –55 °C to +150 °C operating junction temperature range, MSL Level 1 reflow compatibility, and UL 497B recognition make SMBJ45CAHE3/52 appropriate for under-hood engine control modules, body electronics, and ADAS sensor protection where reliability under thermal and electrical stress is mandatory.
How does SMBJ45CAHE3/52 compare to SMBJ45A in circuit design?
SMBJ45CAHE3/52 differs from SMBJ45A in polarity behavior: SMBJ45CAHE3/52 is bidirectional with symmetrical clamping, while SMBJ45A is unidirectional and requires correct cathode orientation. In practice, SMBJ45CAHE3/52 eliminates polarity-checking during automated placement and supports AC signal lines or differential pairs without redesign. Its VBR (50.0–55.3 V) and VC (72.7 V) match SMBJ45A's values, ensuring equivalent protection level - but SMBJ45CAHE3/52 adds layout flexibility and broader application coverage.
What is the maximum clamping voltage of SMBJ45CAHE3/52 under surge conditions?
The maximum clamping voltage (VC) of SMBJ45CAHE3/52 is 72.7 V, measured at 8.3 A peak pulse current (IPPM) using the standardized 10/1000 μs double-exponential waveform. This value represents the highest voltage that will appear across protected circuitry during a worst-case surge event, directly determining whether downstream components such as 75 V-rated MOSFETs or 3.3 V logic inputs remain within safe operating limits - confirming SMBJ45CAHE3/52's suitability for 48 V system protection.
Does SMBJ45CAHE3/52 require heatsinking for standard operation?
No, SMBJ45CAHE3/52 does not require external heatsinking for single-event transient suppression, as its 600 W peak pulse power is inherently short-duration (<1 ms). However, thermal design must follow Vishay's recommended 5.0 mm × 5.0 mm copper pad per terminal to achieve the specified RθJA of 100 °C/W. For repetitive surge conditions or elevated ambient temperatures (>70 °C), PCB copper area should be increased or adjacent thermal vias added - but SMBJ45CAHE3/52 itself remains self-contained with no mechanical heatsink interface.
SMBJ45CAHE3/52 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:
- -
- 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)
SMBJ45CAHE3/52 FAQ
1.How can I place an order for SMBJ45CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CAHE3/52 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 SMBJ45CAHE3/52 reliable?
The price and inventory of SMBJ45CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ45CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CAHE3/52?
SMBJ45CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CAHE3/52 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 SMBJ45CAHE3/52?
For technical support, including SMBJ45CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CAHE3/52 requirements.
6.How does Aetrix verify that SMBJ45CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ45CAHE3/52 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 SMBJ45CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ45CAHE3/52?
All SMBJ45CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CAHE3/52, 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 SMBJ45CAHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ45CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45CAHE3/52 Tags
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