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Vishay General Semiconductor - Diodes Division SMBJ75CAHM3_B/I
- Part No.:
- SMBJ75CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ75CAHM3_B/I.pdf
- Description:
- 600W,75V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,401
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Product details
Overview
SMBJ75CAHM3_B/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 power and signal lines. It features a 75 V stand-off voltage (VWM), 83.3–92.1 V breakdown voltage (VBR) at 1 mA, 121 V maximum clamping voltage (VC) at 5.0 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 SMBJ75CAHM3_B/I datasheet, SMBJ75CAHM3_B/I pinout, SMBJ75CAHM3_B/I application, or SMBJ75CAHM3_B/I equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, AEC-Q101-qualified halogen-free construction, thermal resistance (RθJA = 100 °C/W), and real-world protection use cases - all confirmed from Vishay's official SMBJ5.0A–SMBJ188A specification document (Rev. 09-Jan-2024, Doc. #88392).
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (83.3–92.1 V), VC = 121 V at IPPM = 5.0 A, and ID ≤ 1.0 µA at VWM = 75 V. Its glass-passivated junction ensures stable leakage and fast response (<1 ns), while the SMB package supports automated placement and meets MSL Level 1 (260 °C reflow peak).
The device is halogen-free and RoHS-compliant (HM3 suffix), qualified to AEC-Q101 for automotive-grade reliability, and rated for TJ = –55 to +150 °C operation. Thermal resistance values (RθJA = 100 °C/W, RθJL = 20 °C/W) are measured on 0.2" × 0.2" copper pads - critical for transient energy dissipation in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working range for protected circuitry. |
| VBR (min/max) | 83.3 V / 92.1 V at IT = 1 mA - Confirmed bidirectional breakdown threshold; ensures consistent clamping onset across polarity. |
| VC @ IPPM | 121 V at 5.0 A (10/1000 µs) - Clamped voltage seen by downstream components during surge; determines minimum IC withstand margin. |
| PPPM | 600 W - Peak transient power it can absorb without failure; enables robust protection against IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | ≤ 1.0 µA - Ultra-low reverse leakage at rated stand-off; avoids DC loading or battery drain in always-on systems. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in high-ambient environments like engine control units. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" pads; informs derating above 25 °C ambient. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated terminals, MSL Level 1 compliant. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); cathode band not marked (bidirectional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical junction; accepts surge current from either direction during overvoltage events. |
| Anode | Transient current entry (positive polarity) | Same physical terminal serves as cathode under opposite polarity - bidirectional conduction eliminates orientation dependency. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions - simplifies layout and eliminates polarity marking errors in AC-coupled or floating lines. |
| 600 W peak pulse power | Withstands 10/1000 µs surges up to 5.0 A - meets IEC 61000-4-5 surge immunity requirements for industrial and telecom equipment. |
| AEC-Q101 qualified (HM3) | Validated for automotive electronics including body control modules and infotainment power rails - ensures long-term reliability under thermal cycling. |
| Low clamping ratio (VC/VBR ≈ 1.31) | 121 V clamping vs. 92.1 V max VBR - tight voltage control minimizes stress on protected 75 V-rated components. |
| MSL Level 1, 260 °C peak | Compatible with standard lead-free reflow profiles - no special handling or baking required prior to assembly. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting 75 V DC input rails in programmable logic controller (PLC) power stages from inductive switching spikes and load dump transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across input terminals to limit surge voltage to ≤121 V during 600 W transients. Use Value: Prevents damage to upstream DC-DC controllers and downstream microcontrollers by holding rail voltage within safe operating limits during 10/1000 µs surges. |
Use Scenario: Safeguarding LIN bus transceivers and power management ICs in BCMs exposed to ISO 7637-2 pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Fast-response TVS connected between VBAT and GND to clamp negative-going spikes and positive load-dump events. Use Value: Enables AEC-Q101-compliant protection without external polarity selection - reduces BOM count and layout complexity. |
| Telecom Line Card Surge Protection | Consumer Sensor Interface Protection |
|
Use Scenario: Shielding Ethernet PHY power pins and auxiliary bias rails in outdoor telecom base station line cards from lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on 75 V bias supply, absorbing repetitive 600 W pulses with <1 ns response time. Use Value: Maintains system uptime by preventing latch-up or gate oxide rupture in sensitive analog front-end ICs during field-deployed operation. |
Use Scenario: Guarding I²C and analog output lines of MEMS pressure sensors in smart home hubs against ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) bidirectional clamp placed at connector interface to shunt transients before reaching sensor ASIC. Use Value: Preserves signal integrity and prevents false triggers by limiting transient overshoot to ≤121 V while adding negligible DC loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75CAHE3_B/I | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification; same VWM/VBR/VC/PPPM specs. | Approved for commercial-grade industrial and computing applications; not certified for automotive use. | Select when halogen-free content or automotive qualification is not required - lower cost alternative with identical electrical performance. |
| SAC75CA | Same VWM (75 V) and bidirectional function, but in SMC (DO-214AB) package; higher PPPM (1500 W); larger footprint (7.11 mm × 6.22 mm). | Used where higher surge energy absorption is needed and board space permits larger package. | Choose when system-level surge testing exceeds 600 W - e.g., outdoor power equipment requiring IEC 61000-4-5 Level 4 compliance. |
Compared with SMBJ75CAHM3_B/I, the HE3 variant trades halogen-free and automotive qualification for cost savings in non-automotive designs, while the SAC75CA offers 2.5× higher surge capacity in a physically larger package - enabling tiered protection strategies based on application severity and layout constraints.
Availability
SMBJ75CAHM3_B/I is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom line cards, and consumer sensor interfaces requiring stable component supply, halogen-free compliance, and AEC-Q101 reliability assurance.
Supply support for SMBJ75CAHM3_B/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in space-constrained surface-mount applications - targeting industrial automation, automotive electronics, and communications infrastructure where robustness and repeatability are critical.
FAQ
What does the "CA" suffix mean in SMBJ75CAHM3_B/I?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ75CAHM3_B/I provides symmetrical transient voltage clamping in both polarities. Unlike unidirectional variants (e.g., SMBJ75AHM3_B/I), it has no cathode marking and functions identically whether voltage stress is positive or negative relative to ground. This makes SMBJ75CAHM3_B/I ideal for AC lines, floating buses, or differential signal paths where polarity reversal may occur.
Is SMBJ75CAHM3_B/I suitable for automotive applications?
Yes - SMBJ75CAHM3_B/I is AEC-Q101 qualified (indicated by the HM3 suffix), making it suitable for automotive applications including body control modules, infotainment power rails, and ADAS sensor interfaces. Its halogen-free, RoHS-compliant construction and guaranteed operation from –55 °C to +150 °C junction temperature meet stringent automotive environmental and regulatory requirements. Always verify system-level surge test compliance per ISO 7637-2 or ISO 16750-2 when deploying SMBJ75CAHM3_B/I in vehicle platforms.
What is the maximum clamping voltage of SMBJ75CAHM3_B/I under surge conditions?
The maximum clamping voltage (VC) of SMBJ75CAHM3_B/I is 121 V at a peak pulse current (IPPM) of 5.0 A with a 10/1000 µs waveform. This value is measured under standardized test conditions and represents the highest voltage that will appear across the device during a defined transient event. Designers must ensure downstream components have sufficient voltage margin above 121 V to avoid overstress - for example, selecting 150 V-rated capacitors or 130 V-maximum-input DC-DC converters when using SMBJ75CAHM3_B/I.
How does the HM3 suffix differ from E3 or HE3 in Vishay SMBJ part numbers?
The HM3 suffix in SMBJ75CAHM3_B/I indicates halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. In contrast, E3 denotes RoHS-compliant commercial grade only (no halogen-free or automotive qualification), and HE3 adds AEC-Q101 qualification but retains standard RoHS compliance without halogen-free assurance. Thus, SMBJ75CAHM3_B/I uniquely satisfies all three criteria - making it appropriate for automotive Tier 1 suppliers and industrial OEMs with strict material declarations and reliability mandates.
Can SMBJ75CAHM3_B/I be used in place of a unidirectional TVS like SMBJ75AHM3_B/I?
No - SMBJ75CAHM3_B/I is electrically and physically incompatible as a direct replacement for unidirectional types such as SMBJ75AHM3_B/I. While both share the same VWM (75 V) and package (SMB), the bidirectional SMBJ75CAHM3_B/I lacks polarity marking and conducts in both directions, whereas the unidirectional version requires correct anode/cathode orientation and blocks reverse current until breakdown. Substituting SMBJ75CAHM3_B/I in a unidirectional design may cause unintended conduction or failed protection - always match device polarity to circuit topology and validate with transient simulation.
SMBJ75CAHM3_B/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 5A
- 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)
SMBJ75CAHM3_B/I FAQ
1.How can I place an order for SMBJ75CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ75CAHM3_B/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 SMBJ75CAHM3_B/I reliable?
The price and inventory of SMBJ75CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ75CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ75CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ75CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ75CAHM3_B/I?
SMBJ75CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ75CAHM3_B/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 SMBJ75CAHM3_B/I?
For technical support, including SMBJ75CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ75CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ75CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ75CAHM3_B/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 SMBJ75CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ75CAHM3_B/I?
All SMBJ75CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ75CAHM3_B/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 SMBJ75CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ75CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ75CAHM3_B/I Tags
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