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Vishay General Semiconductor - Diodes Division SMBJ45CAHM3/H
- Part No.:
- SMBJ45CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CAHM3/H.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,809
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Product details
Overview
SMBJ45CAHM3/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), 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and telecom line cards.
For engineers reviewing the SMBJ45CAHM3/H datasheet, SMBJ45CAHM3/H pinout, SMBJ45CAHM3/H application, or SMBJ45CAHM3/H equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification status, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This device operates as a bidirectional avalanche diode, symmetrically clamping positive and negative transients above its reverse stand-off voltage (VWM = 45 V) without polarity dependence. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the 10/1000 µs surge rating reflects standardized lightning and inductive-switching transient immunity.
The SMBJ45CAHM3/H is rated for TJ = –55 °C to +150 °C operation, with thermal resistance RθJL = 20 °C/W enabling effective heat transfer to PCB copper pads. Its M3 suffix confirms halogen-free, RoHS-compliant construction and JESD201 Class 2 whisker resistance - critical for automotive and long-life industrial deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 50.0 V / 55.3 V at IT = 1 mA - guaranteed avalanche onset range under standardized test conditions |
| VC @ IPPM | 72.7 V at 8.3 A - clamped voltage during 10/1000 µs transient, defining protected circuit's worst-case overvoltage |
| PPPM | 600 W - peak transient power handling capability with 0.01% duty cycle, enabling robust surge margin |
| ID @ VWM | <1.0 µA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss |
| TJ max. | +150 °C - extended junction temperature rating supports high-ambient environments like motor drives and base stations |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads, guiding PCB thermal design |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads solderable per J-STD-002 and JESD22-B102. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode side) | Transient conduction path (bidirectional) | Acts as cathode during positive surges and anode during negative surges - symmetrical clamping node |
| Anode (Cathode side) | Transient conduction path (bidirectional) | Acts as anode during positive surges and cathode during negative surges - symmetrical clamping node |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surge events (4 kV line-earth) when properly mounted |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics requiring zero-defect reliability and stress-test compliance |
| Halogen-free & RoHS-compliant (M3) | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements for green manufacturing |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity precautions or baking |
Applications
| Industrial Motor Drives | Telecom Line Interface Cards |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensing circuits against inductive kickback from 24–48 V DC motors. IC Role / Device Role / Timing Role: Bidirectional TVS placed across MOSFET gate-source or op-amp inputs to clamp ESD and switching spikes. Use Value: Limits transient overvoltage to ≤72.7 V, preventing gate oxide rupture and analog front-end saturation in real-time control loops. |
Use Scenario: Surge suppression on RS-485/RS-422 differential data lines exposed to lightning-induced surges in outdoor base station cabinets. IC Role / Device Role / Timing Role: Parallel-connected TVS across differential pair to shunt common-mode transients while preserving signal integrity. Use Value: Maintains <1.0 µA leakage at 45 V stand-off, avoiding bias current errors in precision termination networks. |
| Automotive Body Control Modules | Consumer Power Adapters |
Use Scenario: Input-stage protection of 12 V supply rails feeding microcontrollers and CAN transceivers in door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on battery-fed input, upstream of LDOs and PMICs. Use Value: AEC-Q101 qualification ensures survival under load-dump (ISO 7637-2 Pulse 5a) and cold-crank (–40 °C to +150 °C cycling). |
Use Scenario: Secondary-side transient suppression on 5–24 V DC output rails of universal-input AC/DC adapters for USB-C PD and smart home hubs. IC Role / Device Role / Timing Role: Final-stage clamping device after secondary rectification, guarding downstream USB ports and charging ICs. Use Value: 72.7 V clamping voltage prevents latch-up in 5 V logic rails even during 600 W surge events, meeting UL 62368-1 transient immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CAHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Acceptable where halogen content is unrestricted (e.g., commercial-grade power supplies) | Select when cost optimization is prioritized over halogen-free compliance without sacrificing automotive qualification |
| SMAJ45CAHM3 | Lower 400 W PPPM rating; SMA package (smaller footprint, higher RθJA = 140 °C/W) | Limited to lower-energy transients and space-constrained consumer PCBs with adequate thermal relief | Choose only if board area is critical and surge exposure is below IEC 61000-4-5 Level 3 (2 kV) |
Compared with SMBJ45CAHE3/H, the SMBJ45CAHM3/H adds halogen-free compliance without altering clamping performance or automotive qualification; versus SMAJ45CAHM3, it delivers 50% higher surge power handling and superior thermal dissipation in the larger SMB package - essential for industrial and automotive deployment.
Availability
SMBJ45CAHM3/H is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interface cards, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ45CAHM3/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, efficiency, and application-specific performance.
The SMBJ series targets high-reliability transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems where surge immunity, thermal stability, and long-term parametric consistency are non-negotiable.
FAQ
What does the "CA" suffix indicate in SMBJ45CAHM3/H?
The "CA" suffix denotes a bidirectional configuration: SMBJ45CAHM3/H clamps voltage transients equally in both polarities, making it suitable for AC-coupled lines, differential buses, or floating nodes where polarity reversal may occur. Unlike unidirectional variants (e.g., SMBJ45AHM3/H), it has no cathode band marking and exhibits identical VBR and VC in positive and negative directions - confirmed in Vishay Document 88392, Section "DEVICES FOR BIDIRECTION APPLICATIONS".
Is SMBJ45CAHM3/H qualified for automotive use?
Yes, SMBJ45CAHM3/H carries the HM3 suffix, indicating halogen-free, RoHS-compliant construction and full AEC-Q101 qualification per Vishay's ordering information table (Document 88392, Page 3). This certification covers stress tests including high-temperature operating life, temperature cycling, and ESD - validating its use in automotive body electronics, infotainment power supplies, and ADAS sensor interfaces.
What is the maximum clamping voltage of SMBJ45CAHM3/H under surge conditions?
The maximum clamping voltage (VC) of SMBJ45CAHM3/H is 72.7 V at 8.3 A peak pulse current (IPPM), measured using the standardized 10/1000 µs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is specified in the Electrical Characteristics table (Document 88392, Page 2) for the SMBJ45CA variant.
How does the SMB package of SMBJ45CAHM3/H affect thermal performance?
The SMB (DO-214AA) package of SMBJ45CAHM3/H provides a thermal resistance of RθJA = 100 °C/W when mounted on 0.2" × 0.2" copper pads - significantly lower than the SMA package's 140 °C/W. This enables higher sustained power dissipation and improved reliability in thermally demanding applications such as 48 V industrial power rails and automotive under-hood modules.
Can SMBJ45CAHM3/H replace SMBJ45AHE3/H in existing designs?
No direct replacement is assured: SMBJ45CAHM3/H is bidirectional with 45 V VWM and CA suffix, whereas SMBJ45AHE3/H is unidirectional (A suffix) with cathode marking and forward conduction capability. Substitution requires verifying circuit polarity, clamping symmetry needs, and layout compatibility - especially absence of cathode orientation constraints. Always validate with transient simulation and surge testing.
SMBJ45CAHM3/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:
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ45CAHM3/H FAQ
1.How can I place an order for SMBJ45CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CAHM3/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 SMBJ45CAHM3/H reliable?
The price and inventory of SMBJ45CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ45CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CAHM3/H?
SMBJ45CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CAHM3/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 SMBJ45CAHM3/H?
For technical support, including SMBJ45CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CAHM3/H requirements.
6.How does Aetrix verify that SMBJ45CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ45CAHM3/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 SMBJ45CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ45CAHM3/H?
All SMBJ45CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CAHM3/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 SMBJ45CAHM3/H part is unused and in its original packaging.
Return procedure for SMBJ45CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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