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Vishay General Semiconductor - Diodes Division SMBJ40CD-M3/H
- Part No.:
- SMBJ40CD-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CD-M3/H.pdf
- Description:
- TVS DIODE 40VWM 63.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,905
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Product details
Overview
SMBJ40CD-M3/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, with 40 V stand-off voltage (VWM), 45.1–48.4 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), and 63.6 V clamping voltage (VC) at 9.43 A IPPM. It protects signal lines and power rails in industrial sensor interfaces and telecom front-ends against ESD and inductive switching transients.
For engineers reviewing the SMBJ40CD-M3/H datasheet, SMBJ40CD-M3/H pinout, SMBJ40CD-M3/H application, or SMBJ40CD-M3/H equivalent, key selection criteria include bidirectional clamping symmetry, ±3.5 % VBR tolerance, low leakage (<0.5 μA at VWM), MSL Level 1 moisture sensitivity, and halogen-free RoHS-compliant construction for high-reliability automated assembly.
Technical Context
This device operates as a voltage-clamped crowbar during transient overvoltage events, conducting surge current above its breakdown threshold while limiting downstream voltage to ≤63.6 V. Its bidirectional architecture enables symmetric protection on AC-coupled or floating lines without polarity constraints.
Designed for 10/1000 μs waveform compliance per ANSI/IEEE C62.35, SMBJ40CD-M3/H delivers 600 W peak pulse power with thermal resistance RθJA = 125 °C/W (on minimum pad) and junction temperature range of –55 °C to +150 °C - enabling use in unheatsinked industrial environments up to 85 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC signal rail margin |
| VBR min/max | 45.1 V / 48.4 V at 1 mA - tight ±3.5 % tolerance ensures predictable turn-on across production lots |
| VC @ IPPM | 63.6 V at 9.43 A - clamping voltage under full 600 W surge; limits stress on protected ICs like RS-485 transceivers |
| PPPM | 600 W (10/1000 μs) - standardized surge rating for lightning/inductive spike immunity per IEC 61000-4-5 |
| ID @ VWM | ≤0.5 μA - ultra-low leakage preserves signal integrity in high-impedance sensor bias networks |
| Package | SMB (DO-214AA) - 2-pin SMD footprint compatible with IPC-7351B standard; supports automated pick-and-place |
| MSL Level | Level 1 (J-STD-020) - no floor life limitation; can be stored indefinitely before reflow |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no cathode band marking - both terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals serve identical clamping function; no polarity dependency - simplifies layout on differential or AC lines |
| Cathode Band (absent) | Polarity indicator | Not present on bidirectional variants - eliminates risk of incorrect orientation during placement |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Ensures consistent clamping onset across manufacturing batches - critical for multi-channel systems requiring matched protection thresholds |
| 600 W peak pulse power | Withstands 10/1000 μs surges up to 9.43 A - meets Level 4 IEC 61000-4-5 requirements for industrial equipment |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability - suitable for automotive-qualified and green manufacturing programs |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response) - enhances protection of sub-20 V logic interfaces |
| Matte tin-plated leads | Solderable per J-STD-002 and JESD22-B102 - ensures robust reflow joint formation in lead-free processes |
Applications
| Industrial Sensor Interface | RS-485/422 Data Line |
|---|---|
Use Scenario: Protection of analog output lines (4–20 mA) and digital I/O in PLC modules exposed to motor drive noise and relay coil kickback. IC Role / Device Role: Bidirectional TVS placed across signal and return paths to clamp common-mode and differential transients. Use Value: SMBJ40CD-M3/H's 40 V VWM aligns with 24 V system rails while clamping ≤63.6 V - preserving integrity of op-amps and ADC drivers rated to 70 V absolute max. |
Use Scenario: Transient suppression on balanced differential bus lines in factory automation networks subject to cable discharge and ground potential differences. IC Role / Device Role: Symmetric clamping device mounted between A/B lines and ground to limit differential and common-mode overvoltage. Use Value: Bidirectional operation ensures equal protection regardless of signal polarity reversal; 63.6 V VC stays below RS-485 receiver input damage threshold (typically 15 V differential + 12 V common-mode). |
| Telecom Power Feeding | Automotive Body Control Module |
Use Scenario: Surge protection on PoE-powered Ethernet ports where DC bias (up to 57 V) coexists with fast transients from line faults or lightning-induced coupling. IC Role / Device Role: Standoff-rated TVS placed across power pair to absorb energy without disrupting 48 V DC supply. Use Value: 40 V VWM provides 7 V margin below typical PoE Class 3 minimum (44 V), while 600 W rating handles IEEE 802.3bt surge test profiles. |
Use Scenario: Input protection for LIN bus transceivers and switch inputs connected to vehicle battery (12 V nominal, up to 16 V run, 24 V load dump). IC Role / Device Role: Secondary-level TVS on low-voltage control lines after primary load-dump suppressors. Use Value: SMBJ40CD-M3/H's 45.1–48.4 V VBR avoids false triggering during 24 V load dump (peak ~35 V), yet clamps fast spikes before they reach LIN PHY inputs. |
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 (Vishay) | Same VWM/VBR/VC specs; differs only in packaging (tape-and-reel vs. bulk) and MSL rating (Level 1 vs. unspecified) | No functional difference; E3/52 variant uses legacy halogen-containing molding compound | Select SMBJ40CD-M3/H when halogen-free, RoHS-compliant, and JESD201 Class 2 whisker resistance are required. |
| 1.5KE40CA (ON Semiconductor) | Through-hole DO-201 package; same 40 V VWM but higher VC (64.5 V) and lower IPPM (9.2 A); 1500 W rating reflects different test waveform (10/1000 μs same, but derating differs) | Requires PCB through-hole real estate and wave soldering; not suitable for dense SMT layouts | Choose SMBJ40CD-M3/H for space-constrained SMT designs needing automated assembly and tighter VBR tolerance. |
Compared with SMBJ40CA-E3/52, SMBJ40CD-M3/H adds halogen-free compliance and verified whisker resistance; versus 1.5KE40CA, it offers 30 % smaller footprint, superior MSL handling, and tighter VBR control - making it optimal for modern industrial and telecom SMT platforms.
Availability
SMBJ40CD-M3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, RS-485 data lines, telecom power feeding, and automotive body control modules requiring stable component supply with guaranteed long-term sourcing.
Supply support for SMBJ40CD-M3/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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for industrial, automotive, and computing markets.
SMBJ40CD-M3/H belongs to Vishay's TRANSZORB® TVS family - engineered specifically for robust, repeatable transient suppression in harsh electromagnetic environments with minimal design overhead.
FAQ
What is the clamping voltage of SMBJ40CD-M3/H at its rated peak pulse current?
The SMBJ40CD-M3/H has a maximum clamping voltage (VC) of 63.6 V at its peak pulse current (IPPM) of 9.43 A, measured under the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full 600 W transient event - a critical parameter for ensuring downstream ICs remain within their absolute maximum ratings. The SMBJ40CD-M3/H maintains this clamping performance consistently across its operating temperature range.
Is SMBJ40CD-M3/H suitable for bidirectional signal line protection?
Yes, SMBJ40CD-M3/H is explicitly designed for bidirectional protection: its CD suffix denotes bidirectional construction, with symmetrical breakdown and clamping characteristics in both polarities. Unlike unidirectional variants, it lacks a cathode band and functions identically regardless of voltage polarity - making it ideal for AC-coupled interfaces such as RS-485, CAN FD, or audio lines where signal swing crosses ground. The SMBJ40CD-M3/H datasheet confirms electrical characteristics apply equally in both directions.
Does SMBJ40CD-M3/H meet RoHS and halogen-free requirements?
Yes, SMBJ40CD-M3/H carries the M3 suffix, indicating compliance with RoHS Directive 2011/65/EU and halogen-free status per IEC 61249-2-21. It uses bromine- and chlorine-free molding compound and matte tin-plated terminations, satisfying strict environmental mandates for consumer, industrial, and automotive applications. The M3 designation also certifies conformance to JESD201 Class 2 whisker resistance testing - a requirement for high-reliability deployments where tin whisker growth could cause latent shorts.
What is the thermal resistance of SMBJ40CD-M3/H under standard mounting conditions?
The SMBJ40CD-M3/H has a typical junction-to-ambient thermal resistance (RθJA) of 125 °C/W when mounted on the minimum recommended PCB pad layout, and 100 °C/W on a 5.0 mm × 5.0 mm copper pad area. These values directly impact steady-state power dissipation capability: at TA = 25 °C, SMBJ40CD-M3/H supports 1.0 W continuous power, derating linearly above that temperature. Engineers must reference Fig. 5 in the Vishay datasheet (Doc. #87606) to calculate allowable power under actual board layout and ambient conditions.
How does the ±3.5 % VBR tolerance of SMBJ40CD-M3/H benefit circuit design?
The ±3.5 % breakdown voltage tolerance (45.1–48.4 V at 1 mA) ensures precise and repeatable clamping onset across production units - eliminating need for design guard-banding or post-production binning. This tight specification allows designers to confidently set VWM at 40 V while maintaining ≥5 V margin to minimum VBR, improving noise immunity without risking premature conduction during normal operation. For systems with multiple protected channels - such as multi-sensor industrial nodes - SMBJ40CD-M3/H's consistency reduces calibration complexity and field failure risk.
SMBJ40CD-M3/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 45.1V
- Voltage - Clamping (Max) @ Ipp:
- 63.6V
- Current - Peak Pulse (10/1000µs):
- 9.43A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ40CD-M3/H FAQ
1.How can I place an order for SMBJ40CD-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CD-M3/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 SMBJ40CD-M3/H reliable?
The price and inventory of SMBJ40CD-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40CD-M3/H is usually 5 days.
3.What payment methods are accepted for SMBJ40CD-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CD-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CD-M3/H?
SMBJ40CD-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CD-M3/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 SMBJ40CD-M3/H?
For technical support, including SMBJ40CD-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CD-M3/H requirements.
6.How does Aetrix verify that SMBJ40CD-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ40CD-M3/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 SMBJ40CD-M3/H meets industry standards.
7.What is the process for return or replacement of SMBJ40CD-M3/H?
All SMBJ40CD-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CD-M3/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 SMBJ40CD-M3/H part is unused and in its original packaging.
Return procedure for SMBJ40CD-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CD-M3/H Tags
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Diodes Incorporated
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