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Vishay General Semiconductor - Diodes Division SMBJ45CAHE3_A/H
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- Part No.:
- SMBJ45CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CAHE3_A/H.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,767
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Product details
Overview
SMBJ45CAHE3_A/H 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 power and signal lines. It features a 45 V stand-off voltage (VWM), 72.7 V maximum clamping voltage (VC) at 8.3 A peak pulse current (IPPM), 600 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for automotive use - deployed in DC power rail protection for engine control units and infotainment systems.
For engineers reviewing the SMBJ45CAHE3_A/H datasheet, SMBJ45CAHE3_A/H pinout, SMBJ45CAHE3_A/H application, or SMBJ45CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.62), MSL Level 1 moisture sensitivity, matte tin-plated leads per J-STD-002, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with breakdown voltage (VBR) specified at 50.0–55.3 V (min/max) under 1 mA test current, enabling robust overvoltage protection without polarity constraints. Its glass-passivated junction ensures stable leakage performance (<1.0 µA at VWM) and fast response time (<1.0 ns), critical for suppressing ESD and lightning-induced surges on bidirectional interfaces like CAN FD and LIN bus lines.
The device delivers 600 W peak pulse power handling with a 10/1000 µs waveform and supports repetitive surge duty cycles up to 0.01 %. Thermal resistance is rated at RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), allowing reliable operation up to TJ = +150 °C in compact PCB layouts with minimal copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 45 V - Maximum continuous reverse voltage before significant conduction begins; defines operating margin below clamping threshold. |
| VC (Clamping Voltage) | 72.7 V at IPPM = 8.3 A - Peak voltage seen by protected circuit during 600 W transient; determines downstream component voltage stress. |
| VBR (Breakdown Voltage) | 50.0–55.3 V at IT = 1 mA - Symmetrical avalanche onset range confirming bidirectional behavior and design tolerance. |
| IPPM (Peak Pulse Current) | 8.3 A (10/1000 µs) - Surge current capacity defining protection level against IEC 61000-4-5 Level 3/4 transients. |
| PPPM (Peak Pulse Power) | 600 W - Transient energy absorption capability; enables single-device protection of 12 V/24 V automotive power rails. |
| TJ max. | +150 °C - Maximum junction temperature supporting under-hood automotive deployment without derating. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. No polarity marking on bidirectional variants; terminals are symmetrical anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Surge current path terminal | Both terminals function identically; connects across protected line and ground (or between differential lines) to clamp bidirectionally. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN) without polarity concerns. |
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 4th edition surge immunity up to 1 kV open-circuit / 0.5 kV short-circuit on 50 Ω source impedance. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive electronics including powertrain, body control, and ADAS modules requiring long-term field reliability. |
| MSL Level 1, 260 °C reflow compatible | Allows standard lead-free reflow assembly without pre-baking; eliminates moisture-related popcorning risk. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving system-level EMI resilience. |
Applications
| Automotive Power Rail Protection | CAN FD Bus Line Protection |
|---|---|
|
Use Scenario: Suppressing load dump and alternator ripple transients on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Bidirectional TVS placed between VBAT and GND to clamp spikes up to ±100 V while maintaining 45 V operating margin. Use Value: Prevents latch-up or gate oxide damage in MCU power supplies and PMICs during cold-crank and jump-start events. |
Use Scenario: Protecting high-speed CAN FD transceivers (5 Mbps) from ESD and coupled noise on vehicle chassis grounds. IC Role / Device Role / Timing Role: Differential TVS across CANH–CANL lines to limit common-mode surge without distorting signal integrity. Use Value: Maintains <15 pF junction capacitance at zero bias, ensuring <1% signal rise-time degradation at 5 Mbps data rate. |
| Industrial Sensor Signal Conditioning | Telecom DC Power Input Stage |
|
Use Scenario: Shielding 4–20 mA analog sensor outputs from induced surges in factory floor wiring harnesses. IC Role / Device Role / Timing Role: Bidirectional clamping device installed at sensor module input to shunt transients before op-amp front-end. Use Value: Limits voltage excursion to ≤72.7 V during 1 kV/500 A surge, preserving 16-bit ADC reference stability and linearity. |
Use Scenario: Safeguarding PoE-powered equipment (IEEE 802.3af/at) against lightning-induced surges on 48 V DC input. IC Role / Device Role / Timing Role: Primary TVS on DC input rail upstream of DC/DC converter, rated for repeated 600 W pulses. Use Value: Absorbs >95 % of surge energy before downstream components, reducing need for secondary MOV-based staging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ45CA | Same VWM (45 V), slightly higher VC (73.5 V), lower PPPM (400 W), non-AEC-Q101 rated | Qualified for commercial/industrial use only; not validated for automotive temperature cycling or HTRB. | Select when cost sensitivity outweighs automotive qualification requirements and surge energy is ≤400 W. |
| ON Semiconductor SMCJ45CA | Identical VWM/VC, same PPPM (600 W), AEC-Q101 qualified, but SMB package replaced by larger SMC (DO-214AB) | Requires PCB layout change due to 7.11 mm × 6.22 mm footprint vs. SMB's 4.57 mm × 3.94 mm; higher thermal mass. | Choose when higher thermal dissipation is needed and board space permits larger package; otherwise prefer SMBJ45CAHE3_A/H for space-constrained designs. |
Compared with SMAJ45CA and SMCJ45CA, SMBJ45CAHE3_A/H offers optimal balance of automotive qualification, compact SMB footprint, and precise 72.7 V clamping - making it preferred for ECU, ADAS camera, and infotainment modules where board area and AEC compliance are co-constrained.
Availability
SMBJ45CAHE3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom DC power inputs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ45CAHE3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and communications systems where robustness against ESD, lightning, and load dump is mission-critical.
FAQ
What is the clamping voltage of SMBJ45CAHE3_A/H at its rated peak pulse current?
The SMBJ45CAHE3_A/H has a maximum clamping voltage (VC) of 72.7 V when subjected to its rated peak pulse current of 8.3 A using the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ45CAHE3_A/H maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C).
Is SMBJ45CAHE3_A/H suitable for automotive applications?
Yes, SMBJ45CAHE3_A/H is AEC-Q101 qualified, as confirmed by the "HE3" suffix and Vishay documentation. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias (HTRB), and ESD per AEC-Q101 Rev D. The SMBJ45CAHE3_A/H is explicitly recommended for engine control units, body electronics, and infotainment systems where sustained operation at +150 °C junction temperature and immunity to automotive transients (ISO 7637-2) are required.
How does the bidirectional configuration of SMBJ45CAHE3_A/H affect its circuit implementation?
The SMBJ45CAHE3_A/H has no polarity marking and functions identically in both directions, allowing direct placement across any two nodes needing symmetrical overvoltage protection - such as CANH/CANL differential pairs or AC-coupled sensor outputs. Unlike unidirectional TVS diodes, the SMBJ45CAHE3_A/H eliminates orientation errors during automated assembly and avoids forward-voltage drop concerns on bidirectional signal paths, simplifying layout and validation.
What is the thermal resistance of SMBJ45CAHE3_A/H, and how does it impact PCB layout?
The SMBJ45CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W, measured on 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under repetitive surges, PCB layout must provide at least this minimum pad area; reducing copper area increases thermal impedance and risks exceeding the +150 °C TJ limit. The SMBJ45CAHE3_A/H does not require external heatsinking in standard applications.
Does SMBJ45CAHE3_A/H meet moisture sensitivity and reflow requirements for lead-free assembly?
Yes, SMBJ45CAHE3_A/H is rated MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C, fully compliant with IPC/JEDEC J-STD-020D. Its matte tin-plated leads meet J-STD-002B solderability requirements, and the molding compound achieves UL 94 V-0 flammability rating. No pre-baking is required prior to reflow, streamlining high-volume SMT manufacturing for the SMBJ45CAHE3_A/H.
SMBJ45CAHE3_A/H 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/H FAQ
1.How can I place an order for SMBJ45CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CAHE3_A/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 SMBJ45CAHE3_A/H reliable?
The price and inventory of SMBJ45CAHE3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMBJ45CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CAHE3_A/H?
SMBJ45CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CAHE3_A/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 SMBJ45CAHE3_A/H?
For technical support, including SMBJ45CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CAHE3_A/H requirements.
6.How does Aetrix verify that SMBJ45CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ45CAHE3_A/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 SMBJ45CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ45CAHE3_A/H?
All SMBJ45CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CAHE3_A/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 SMBJ45CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMBJ45CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45CAHE3_A/H Tags
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