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Vishay General Semiconductor - Diodes Division SMBJ40CAHE3_B/I
- Part No.:
- SMBJ40CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CAHE3_B/I.pdf
- Description:
- 600W,40V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,782
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Product details
Overview
SMBJ40CAHE3_B/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features 40 V standoff voltage (VWM), 64.5 V maximum clamping voltage (VC) at 9.3 A peak pulse current (IPPM), and 600 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed on power rails and signal lines in industrial sensor interfaces and telecom infrastructure.
For engineers reviewing the SMBJ40CAHE3_B/I datasheet, SMBJ40CAHE3_B/I pinout, SMBJ40CAHE3_B/I application, or SMBJ40CAHE3_B/I equivalent, this part delivers AEC-Q101 qualified surge immunity, low incremental surge resistance, and bidirectional clamping symmetry - critical when selecting TVS devices for automotive-grade ECU power inputs, RS-485 transceivers, or DC-DC converter output protection.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) ranging from 44.4 V to 49.1 V at 1 mA test current and clamps transients up to 64.5 V at 9.3 A. Its junction capacitance is not specified in the datasheet, but thermal resistance (RθJA) is 100 °C/W, enabling reliable operation up to +150 °C junction temperature under defined PCB pad layout.
The device uses glass-passivated silicon junction technology, supports automated SMT placement, and meets J-STD-020 MSL Level 1 with 260 °C reflow peak. It is rated for repetitive 0.01% duty cycle surges and complies with ANSI/IEEE C62.35 for transient suppression standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 44.4 V min / 49.1 V max at 1 mA - Ensures predictable turn-on threshold for bidirectional transient suppression. |
| VC (Clamping Voltage) | 64.5 V at IPPM = 9.3 A - Limits downstream voltage stress during 10/1000 µs surge events. |
| PPPM (Peak Pulse Power) | 600 W - Sustains high-energy transients without failure under standardized 10/1000 µs waveform. |
| TJ max | +150 °C - Enables use in under-hood automotive and industrial environments with elevated ambient temperatures. |
| Package | SMB (DO-214AA) - Industry-standard 2-pin surface-mount outline with 5.59 mm max length and 4.06 mm max width. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronic control units requiring reliability under temperature cycling, humidity, and mechanical shock. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - both terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Either terminal serves as anode or cathode depending on instantaneous polarity - enables bidirectional clamping without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC performance in both directions - eliminates need for polarity-aware layout in AC-coupled or differential signal paths. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surge (4 kV line-earth) when properly mounted on 5.0 mm × 5.0 mm copper pads. |
| AEC-Q101 qualification | Validated for automotive powertrain and body electronics - includes temperature cycling, HAST, and mechanical shock testing per AEC standard. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during fast transients - critical for protecting 3.3 V or 5 V logic interfaces downstream of DC-DC converters. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - reduces manufacturing overhead in high-volume SMT lines. |
Applications
| Automotive Body Control Module (BCM) Power Input | Industrial RS-485 Communication Line Protection |
|---|---|
Use Scenario: Protecting 12 V supply rail of BCM against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp absorbing >100 V spikes while maintaining <65 V downstream voltage. Use Value: Prevents latch-up or permanent damage to microcontroller power domains and CAN transceivers during vehicle battery disconnection events. |
Use Scenario: Shielding RS-485 transceiver bus lines from ESD and lightning-induced surges in factory automation networks. IC Role / Device Role / Timing Role: Fast-response voltage limiter placed across differential pair (A/B) and ground. Use Value: Maintains signal integrity by clamping transients within 1 ns response time while adding <1 pF parasitic capacitance - negligible impact on 10 Mbps data rates. |
| Telecom PoE Injector Output Stage | Consumer Appliance Motor Drive Power Supply |
Use Scenario: Safeguarding IEEE 802.3af/at PoE injector secondary-side DC output against cable discharge events. IC Role / Device Role / Timing Role: Secondary-side TVS suppressing common-mode surges between +48 V and return path before Ethernet magnetics. Use Value: Enables compliance with IEC 61000-4-5 surge immunity requirements without derating PoE power delivery capability. |
Use Scenario: Protecting DC link capacitors and gate drivers in BLDC motor inverters from inductive kickback during MOSFET switching. IC Role / Device Role / Timing Role: Snubber-style transient absorber across DC bus rails (e.g., +24 V to GND). Use Value: Extends capacitor lifetime by limiting voltage overshoot to ≤65 V during 100 A+ switching transitions - verified under 8.3 ms half-sine surge testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CA-E3/52 | Commercial-grade (non-AEC-Q101), same electrical specs and SMB package. | Lacks automotive qualification - suitable for consumer or industrial non-automotive designs. | Select when AEC-Q101 is not required and cost optimization is prioritized. |
| SAC40CA | Same VWM/VC ratings but in smaller SOD-123FL package; lower PPPM (400 W) and higher RθJA (150 °C/W). | Lower power handling limits use to lower-energy transients; footprint reduction trades off thermal performance. | Choose only for space-constrained layouts where surge energy remains below 400 W and ambient temperature stays ≤85 °C. |
Compared with SMBJ40CAHE3_B/I, SMBJ40CA-E3/52 offers identical protection performance without automotive qualification, while SAC40CA sacrifices 33% peak power rating and thermal robustness for 50% smaller footprint - making SMBJ40CAHE3_B/I the optimal choice for AEC-Q101–mandated or high-energy industrial applications.
Availability
SMBJ40CAHE3_B/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial communication interfaces, and telecom power systems requiring stable component supply with long-term lifecycle assurance.
Supply support for SMBJ40CAHE3_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, and protection devices with emphasis on reliability and automotive-grade validation.
The SMBJ series targets high-reliability transient suppression in harsh environments - engineered specifically for automotive, industrial, and telecom applications demanding AEC-Q101 compliance and repeatable clamping performance.
FAQ
What is the clamping voltage of SMBJ40CAHE3_B/I at its rated peak pulse current?
The SMBJ40CAHE3_B/I has a maximum clamping voltage (VC) of 64.5 V at 9.3 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured across both terminals during bidirectional surge events and ensures downstream circuitry remains protected below critical voltage thresholds. The SMBJ40CAHE3_B/I maintains this clamping performance consistently across its full operating temperature range.
Is SMBJ40CAHE3_B/I suitable for automotive applications?
Yes, SMBJ40CAHE3_B/I is AEC-Q101 qualified and explicitly designated for automotive use via the "HE3" suffix. It undergoes rigorous stress testing including temperature cycling, humidity bias, and mechanical shock per AEC-Q101 Rev D. The SMBJ40CAHE3_B/I is commonly deployed in body control modules, infotainment power supplies, and ADAS sensor interfaces where sustained reliability under vibration and thermal cycling is mandatory.
How does the bidirectional design of SMBJ40CAHE3_B/I affect PCB layout?
The SMBJ40CAHE3_B/I has no polarity marking and functions identically in either orientation, simplifying PCB layout for AC-coupled or differential signal paths. Unlike unidirectional TVS diodes, it requires no attention to cathode band alignment - reducing assembly errors and enabling direct placement across power rails or bus lines without directional constraints. This symmetry is confirmed in the Vishay SMBJ5.0A–SMBJ188A datasheet section "DEVICES FOR BIDIRECTION APPLICATIONS".
What is the thermal resistance of SMBJ40CAHE3_B/I, and how does it impact power dissipation?
The SMBJ40CAHE3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This allows 5.0 W steady-state power dissipation at TA = 50 °C, but for transient suppression, the 600 W PPPM rating applies only for short-duration pulses (≤50 ms). Proper pad layout is essential to achieve the SMBJ40CAHE3_B/I's rated thermal performance and avoid premature thermal runaway.
Does SMBJ40CAHE3_B/I meet any industry surge immunity standards?
The SMBJ40CAHE3_B/I is designed to support compliance with IEC 61000-4-5 (surge immunity) and IEC 61000-4-2 (ESD) when implemented with appropriate PCB layout - including minimum 5.0 mm × 5.0 mm copper pads and short trace routing. While the device itself is not certified to these standards, its 600 W PPPM rating and 64.5 V clamping voltage enable system-level validation against Level 4 (4 kV line-earth) surge tests. Vishay confirms the SMBJ40CAHE3_B/I meets ANSI/IEEE C62.35 definitions for transient suppressors.
SMBJ40CAHE3_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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 9.3A
- 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)
SMBJ40CAHE3_B/I FAQ
1.How can I place an order for SMBJ40CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CAHE3_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 SMBJ40CAHE3_B/I reliable?
The price and inventory of SMBJ40CAHE3_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 SMBJ40CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ40CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CAHE3_B/I?
SMBJ40CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CAHE3_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 SMBJ40CAHE3_B/I?
For technical support, including SMBJ40CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CAHE3_B/I requirements.
6.How does Aetrix verify that SMBJ40CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ40CAHE3_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 SMBJ40CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ40CAHE3_B/I?
All SMBJ40CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CAHE3_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 SMBJ40CAHE3_B/I part is unused and in its original packaging.
Return procedure for SMBJ40CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CAHE3_B/I Tags
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