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Vishay General Semiconductor - Diodes Division SMBJ45CAHM3_A/I
- Part No.:
- SMBJ45CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CAHM3_A/I.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,742
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Product details
Overview
SMBJ45CAHM3_A/I 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 45 V stand-off voltage (VWM), 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), protecting sensitive ICs and MOSFETs in industrial sensor interfaces.
For engineers reviewing the SMBJ45CAHM3_A/I datasheet, SMBJ45CAHM3_A/I pinout, SMBJ45CAHM3_A/I application, or SMBJ45CAHM3_A/I equivalent, key selection criteria include bidirectional surge protection capability, low clamping ratio (VC/VWM ≈ 1.62), AEC-Q101 qualification status, halogen-free RoHS compliance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism. Its bidirectional symmetry enables suppression of both positive and negative transients without polarity sensitivity, making it suitable for AC-coupled or floating signal lines. The glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM).
Thermal performance is defined by RθJA = 100 °C/W and RθJL = 20 °C/W, supporting operation up to TJ = +150 °C. It meets MSL level 1 per J-STD-020 with peak reflow temperature of 260 °C, and its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min / max | 50.0 V / 55.3 V - Breakdown voltage range at 1 mA test current; ensures reliable turn-on within specified tolerance. |
| VC @ IPPM | 72.7 V - Clamped voltage at 8.3 A peak pulse current (10/1000 μs); determines worst-case overvoltage seen by downstream components. |
| PPPM | 600 W - Peak pulse power handling capability; supports robust protection against lightning-induced surges and inductive switching spikes. |
| ID @ VWM | ≤1.0 μA - Reverse leakage current at stand-off voltage; minimizes standby power loss and avoids false triggering. |
| TJ max | +150 °C - Maximum junction temperature; enables use in high-ambient environments such as automotive engine bays or industrial enclosures. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 0.220" × 0.155" footprint; compatible with industry-standard pick-and-place equipment. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Cathode/anode terminals are symmetrical; both ends function identically under reverse or forward transient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve as interchangeable surge current entry/exit points; no directional bias required for bidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or floating buses without external polarity management. |
| 600 W peak pulse power (10/1000 μs) | Withstands high-energy transients common in industrial motor drives and telecom line surges. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global electronics manufacturing and end-of-life disposal. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life before reflow; eliminates baking requirement and simplifies SMT production flow. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors exposed to relay coil flyback and ESD events in factory automation systems. IC Role / Device Role / Timing Role: Voltage clamping element placed directly at connector entry point to shunt transient energy before reaching ADC input or microcontroller GPIO. Use Value: Limits induced overvoltage to ≤72.7 V during 8.3 A surges, preserving signal integrity and preventing latch-up in 3.3 V or 5 V interface ICs. |
Use Scenario: Safeguarding LIN bus communication lines in door modules subjected to load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across LIN differential pair to clamp ±100 V transients while maintaining DC bias integrity. Use Value: Maintains <1.0 μA leakage at 45 V VWM to avoid disturbing 12 V nominal bus voltage, ensuring reliable low-speed communication. |
| Telecom Power Input Stage | Consumer Appliance Motor Driver |
|
Use Scenario: Surge suppression on 48 V DC input rails of PoE-powered network switches exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end protector located upstream of DC-DC converter input capacitors and EMI filter. Use Value: Delivers 600 W pulse power handling with 72.7 V clamping to prevent overvoltage failure of downstream silicon-based regulators. |
Use Scenario: Protecting gate drive signals of half-bridge MOSFETs controlling BLDC motors in washing machines and HVAC fans. IC Role / Device Role / Timing Role: Localized TVS mounted adjacent to gate driver IC outputs to absorb Miller-induced voltage spikes during fast switching. Use Value: Fast response time and low incremental surge resistance minimize voltage overshoot beyond MOSFET VGS(max), reducing risk of gate oxide damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CAHE3_A/I | Same electrical specs but RoHS-compliant commercial grade (non-AEC-Q101); uses standard tin plating instead of whisker-tested matte tin. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost-sensitive non-automotive applications require identical clamping performance without automotive reliability validation. |
| SMAJ45CAHM3_A/I | Lower PPPM rating (400 W vs. 600 W); same VWM (45 V), slightly higher VC (73.5 V at 5.9 A); smaller SMA package (DO-214AC). | Reduced surge margin; limited to lower-energy transients; tighter PCB space requirement. | Choose only if board area constraints prohibit SMB footprint and system-level surge testing confirms 400 W sufficiency. |
Compared with SMBJ45CAHM3_A/I, SMBJ45CAHE3_A/I offers identical protection performance without automotive qualification, while SMAJ45CAHM3_A/I trades 33 % lower pulse power and reduced thermal mass for smaller size-neither is pin-compatible due to differing package outlines (SMB vs. SMA).
Availability
SMBJ45CAHM3_A/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and telecom power input stages requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for SMBJ45CAHM3_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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was developed to deliver high-power transient suppression in compact surface-mount packages for automotive, industrial, and telecom applications demanding AEC-Q101 qualification and halogen-free compliance.
FAQ
What does the "CA" suffix indicate in SMBJ45CAHM3_A/I?
The "CA" suffix denotes a bidirectional configuration, meaning SMBJ45CAHM3_A/I provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMBJ45AHM3_A/I), it has no cathode marking and functions identically regardless of polarity applied across its terminals-ideal for AC signal lines or floating buses where directionality cannot be assumed.
Is SMBJ45CAHM3_A/I qualified for automotive use?
Yes, SMBJ45CAHM3_A/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix indicating halogen-free, RoHS-compliant construction with automotive-grade reliability validation. This includes testing for temperature cycling, humidity resistance, mechanical shock, and solder heat resistance-making SMBJ45CAHM3_A/I suitable for under-hood and body electronics in passenger vehicles and commercial fleets.
What is the maximum clamping voltage of SMBJ45CAHM3_A/I under surge conditions?
The maximum clamping voltage (VC) of SMBJ45CAHM3_A/I is 72.7 V at 8.3 A peak pulse current with a 10/1000 μs waveform. This value represents the upper limit of voltage imposed on protected circuitry during worst-case transient events and is measured under standardized test conditions per ANSI/IEEE C62.35, ensuring repeatable design margin calculation for downstream components.
How does the SMB package of SMBJ45CAHM3_A/I compare to SMA in layout terms?
The SMB (DO-214AA) package of SMBJ45CAHM3_A/I measures 0.220" × 0.155" with 0.086" lead spacing, whereas the smaller SMA (DO-214AC) occupies 0.195" × 0.135". SMB provides greater thermal mass and higher surge capability (600 W vs. 400 W for SMAJ variants), but requires more PCB area. SMBJ45CAHM3_A/I is not physically interchangeable with SMAJ45CAHM3_A/I due to dimensional and pad-layout incompatibility.
Does SMBJ45CAHM3_A/I require derating at elevated ambient temperatures?
Yes, SMBJ45CAHM3_A/I must be derated above TA = 25 °C per Figure 2 in the Vishay datasheet (Document Number: 88392). Its peak pulse power decreases linearly with rising ambient temperature, reaching ~50 % of rated 600 W at TA = 100 °C. Designers must apply this derating curve when sizing SMBJ45CAHM3_A/I for high-temperature enclosures or densely packed boards to ensure sustained surge protection capability.
SMBJ45CAHM3_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:
- 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_A/I FAQ
1.How can I place an order for SMBJ45CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CAHM3_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 SMBJ45CAHM3_A/I reliable?
The price and inventory of SMBJ45CAHM3_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 SMBJ45CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ45CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CAHM3_A/I?
SMBJ45CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CAHM3_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 SMBJ45CAHM3_A/I?
For technical support, including SMBJ45CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CAHM3_A/I requirements.
6.How does Aetrix verify that SMBJ45CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ45CAHM3_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 SMBJ45CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ45CAHM3_A/I?
All SMBJ45CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CAHM3_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 SMBJ45CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ45CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45CAHM3_A/I Tags
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