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Vishay General Semiconductor - Diodes Division SMBJ40CHE3/5B
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- Part No.:
- SMBJ40CHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CHE3/5B.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,754
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Product details
Overview
SMBJ40CHE3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 64.5 V maximum clamping voltage (VC) at 9.3 A peak pulse current, and 600 W peak pulse power rating with a 10/1000 µs waveform.
For engineers reviewing the SMBJ40CHE3/5B datasheet, SMBJ40CHE3/5B pinout, SMBJ40CHE3/5B application, or SMBJ40CHE3/5B equivalent, this device is selected for robust overvoltage protection on DC power rails and low-speed signal lines in automotive, industrial, and telecom systems where AEC-Q101 qualification, low clamping ratio, and fast response time (<1 ns) are critical.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, conducting only in reverse bias above VBR while maintaining high impedance below VWM. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at 40 V), and its thermal resistance (RθJA = 100 °C/W) supports operation up to +150 °C junction temperature.
The SMBJ40CHE3/5B is AEC-Q101 qualified and RoHS-compliant, with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Its MSL Level 1 rating (peak reflow ≤260 °C) enables compatibility with standard SMT assembly processes without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 48 V nominal systems. |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - Confirmed breakdown range ensures reliable triggering across process and temperature variation. |
| VC @ IPPM | 64.5 V at 9.3 A - Clamping voltage under 10/1000 µs surge; limits downstream IC stress to <65 V during 600 W transient events. |
| PPPM | 600 W - Peak pulse power handling capability with 0.01% duty cycle; suitable for infrequent but high-energy surges. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports fault-current withstand in power-line protection. |
| TJ max | +150 °C - Maximum junction temperature; enables deployment in under-hood automotive and industrial environments. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), 2-terminal surface-mount case with cathode band marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. Polarity: band denotes cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or return path; completes conduction loop during reverse-bias clamping event. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 48 V rail or sensor output); absorbs transient energy into ground via avalanche breakdown. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics requiring reliability under thermal cycling and vibration. |
| 600 W peak pulse power (10/1000 µs) | Provides robust protection against ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surge events in industrial and vehicle subsystems. |
| Clamping ratio VC/VBR ≈ 1.37 | Low ratio ensures minimal overvoltage overshoot during clamping-critical for safeguarding 3.3 V/5 V logic interfaces downstream of protection stage. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass reflow assembly without baking or special handling; reduces manufacturing cost and risk of moisture-related defects. |
| Glass passivated junction | Delivers stable VBR tolerance and low leakage (<1 µA) over lifetime, supporting long-term reliability in harsh ambient conditions. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-supplied ECUs from load dump and alternator transients in passenger vehicles and commercial trucks. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp surges up to ±100 V. Use Value: Limits voltage seen by downstream regulators to ≤64.5 V, preventing latch-up or permanent damage during ISO 16750-2 load-dump events. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in PLC modules from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between sensor output line and ground to suppress sub-100 ns ESD pulses. Use Value: Sub-1 ns response time and <1 µA leakage preserve signal integrity and measurement accuracy in 12-bit ADC front-ends. |
| Telecom DC Feeder Line Protection | Consumer Power Adapter Input Stage |
|
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras) against induced surges on 48 V DC feeder lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on the DC input side of the PD controller, upstream of isolation barrier. Use Value: 600 W rating handles repeated lightning-induced surges per IEC 61000-4-5 Level 3 (2 kV/1 kA), ensuring field reliability. |
Use Scenario: Secondary-side transient suppression on 5 V/12 V outputs of wall adapters used in smart home hubs and audio devices. IC Role / Device Role / Timing Role: Final-stage TVS on regulated output rail to absorb coupling noise from internal switching or external ESD. Use Value: Tight VWM = 40 V allows use on 48 V intermediate rails while maintaining margin for ripple and tolerance drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ40A | Same VWM (40 V), slightly higher VC (69.4 V @ 8.6 A), identical SMB package and 600 W rating. | Not AEC-Q101 qualified; rated for commercial/industrial use only. | Select when automotive qualification is not required and supply chain diversification is prioritized. |
| ON Semiconductor SMCJ40A | Identical electrical specs (VWM, VBR, VC, PPPM) and SMB package; AEC-Q101 qualified variant available (SMCJ40AHM3). | SMCJ series uses larger SMC (DO-214AB) package (7.11 mm × 6.22 mm); requires PCB layout change. | Choose only if board redesign accommodates larger footprint; otherwise SMBJ40CHE3/5B offers direct drop-in replacement in SMB-constrained layouts. |
Compared with SMBJ40CHE3/5B, SMAJ40A lacks automotive qualification but offers equivalent surge handling in commercial designs, while SMCJ40A delivers identical performance in a physically larger package-making SMBJ40CHE3/5B the optimal choice for space-constrained AEC-Q101-compliant applications.
Availability
SMBJ40CHE3/5B is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power feeders, and consumer adapter designs requiring stable component supply, AEC-Q101 compliance, and consistent surge immunity performance.
Supply support for SMBJ40CHE3/5B 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, precision, and application-specific optimization.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and communications infrastructure where robustness, speed, and qualification rigor are mandatory.
FAQ
What is the clamping voltage of SMBJ40CHE3/5B at its rated peak pulse current?
The SMBJ40CHE3/5B has a maximum clamping voltage (VC) of 64.5 V at 9.3 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry will not experience voltages exceeding 64.5 V during standardized surge events, making SMBJ40CHE3/5B suitable for protecting 48 V systems with adequate safety margin.
Is SMBJ40CHE3/5B suitable for automotive applications?
Yes, SMBJ40CHE3/5B is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3", which denotes RoHS-compliant and automotive-grade qualification. It meets stress test requirements for temperature cycling, humidity, mechanical shock, and high-temperature operating life-enabling use in engine control units, body controllers, and ADAS power domains without derating.
What is the meaning of the "5B" in SMBJ40CHE3/5B?
The "5B" in SMBJ40CHE3/5B is Vishay's package code indicating 3200 units per 13-inch diameter plastic tape-and-reel delivery format. It does not affect electrical or thermal specifications-only packaging configuration-and is fully compatible with standard SMT pick-and-place equipment calibrated for SMB (DO-214AA) devices.
How does SMBJ40CHE3/5B compare to bidirectional TVS diodes like SMBJ40CA?
SMBJ40CHE3/5B is unidirectional and intended for DC line protection where polarity is fixed (e.g., +48 V rail to ground), offering lower leakage and tighter VBR tolerance. In contrast, SMBJ40CA is bidirectional and suited for AC or floating signal lines. They are not interchangeable without circuit review-using SMBJ40CHE3/5B in place of SMBJ40CA would fail to protect negative-going transients.
What is the thermal resistance and maximum power dissipation of SMBJ40CHE3/5B?
SMBJ40CHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W on standard 0.2" × 0.2" copper pads, and a steady-state power dissipation (PD) rating of 5.0 W at TA = 50 °C. These values define its continuous thermal limits-transient surge handling (600 W) is non-repetitive and governed by pulse duration and duty cycle, not steady-state dissipation.
SMBJ40CHE3/5B 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 8.4A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ40CHE3/5B FAQ
1.How can I place an order for SMBJ40CHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CHE3/5B 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 SMBJ40CHE3/5B reliable?
The price and inventory of SMBJ40CHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40CHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ40CHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CHE3/5B?
SMBJ40CHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CHE3/5B 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 SMBJ40CHE3/5B?
For technical support, including SMBJ40CHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CHE3/5B requirements.
6.How does Aetrix verify that SMBJ40CHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ40CHE3/5B 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 SMBJ40CHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ40CHE3/5B?
All SMBJ40CHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CHE3/5B, 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 SMBJ40CHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ40CHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CHE3/5B Tags
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