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Vishay General Semiconductor - Diodes Division SMB8J40CHE3/5B
- Part No.:
- SMB8J40CHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40CHE3/5B.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,238
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Product details
Overview
SMB8J40CHE3/5B from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection on power and signal lines. It features 40 V stand-off voltage (VWM), 64.5 V maximum clamping voltage (VC) at 12.4 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 μs waveform. Used to protect automotive sensor interfaces, industrial I/O ports, and telecom line drivers against ESD and lightning-induced transients.
For engineers reviewing the SMB8J40CHE3/5B datasheet, SMB8J40CHE3/5B pinout, SMB8J40CHE3/5B application, or SMB8J40CHE3/5B equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, RoHS-compliant HE3 suffix, 13" tape-and-reel packaging (5B), and thermal resistance (RθJA = 72 °C/W) for PCB-level thermal design validation.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 40 V), but switches to low-impedance conduction within <1 ns when reverse voltage exceeds its 44.4–49.1 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable avalanche behavior across -55 °C to +150 °C operating junction temperature.
The SMB8J40CHE3/5B is rated for 800 W peak pulse power (10/1000 μs), with clamping voltage tightly controlled at ≤64.5 V up to 12.4 A IPPM - enabling reliable protection of 3.3 V/5 V/12 V logic interfaces and analog front-ends without overvoltage stress. Its DO-214AA package supports automated SMT placement and meets UL 94 V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin for 36 V nominal systems. |
| VBR (min/max) | 44.4 V / 49.1 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold across production lot. |
| VC @ IPPM | 64.5 V - Clamped voltage at 12.4 A peak pulse current; guarantees protected circuit sees ≤64.5 V during worst-case 800 W surge. |
| PPPM | 800 W - Peak pulse power handling with 10/1000 μs waveform; validates suitability for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges. |
| ID @ VWM | 1.0 μA - Reverse leakage at 40 V; negligible loading on high-impedance sensor bias networks or reference lines. |
| TJ max. | 150 °C - Maximum junction temperature; supports operation in under-hood automotive or enclosed industrial enclosures. |
| RθJA | 72 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; enables thermal derating calculations for sustained surge duty cycles. |
Pinout & Package
DO-214AA (SMB) surface-mount package: molded epoxy case with matte tin-plated leads, polarity-indifferent for bi-directional operation (no cathode band marking), compliant with J-STD-002 solderability and JESD 22-B102 mechanical shock standards. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional surge path | No polarity marking required; terminals interchangeable - enables flexible PCB layout and eliminates orientation errors during assembly. |
| Case (body) | Thermal and mechanical interface | Exposed copper pad area (0.2" × 0.2") required per terminal for thermal dissipation and mechanical anchoring per JEDEC MO-136. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - suitable for engine control, ADAS sensor, and infotainment power rails. |
| Glass-passivated junction | Stable avalanche characteristics over lifetime and temperature; eliminates parameter drift due to moisture ingress or metallization migration. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking; reduces manufacturing complexity and cost. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulant prevents flame propagation in safety-critical enclosures per IEC 60950-1 and ISO 26262 system requirements. |
| HE3 suffix | RoHS-compliant + AEC-Q101 qualified + JESD 201 Class 2 whisker resistance - ensures long-term solder joint integrity in vibration-prone environments. |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional shunt clamp absorbing ±200 V transients while maintaining signal integrity below 64.5 V. Use Value: Prevents latch-up or permanent damage to 5 V/12 V interface ICs without adding series impedance or propagation delay. |
Use Scenario: Safeguarding PLC digital input modules and analog acquisition channels against field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Fast-response (<1 ns) voltage limiter placed directly at connector entry point to divert surge energy to ground before reaching ASICs. Use Value: Enables compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) immunity requirements without external filtering components. |
| Telecom Line Driver Protection | Consumer Power Adapter Output Protection |
Use Scenario: Shielding Ethernet PHY magnetics and RS-485 transceivers from lightning-induced common-mode surges on outdoor cabling. IC Role / Device Role / Timing Role: Symmetrical bi-directional clamp referenced to local ground, suppressing differential and common-mode transients simultaneously. Use Value: Maintains signal eye diagram integrity at 100 Mbps+ data rates by limiting overshoot/undershoot to <65 V without distorting edge timing. |
Use Scenario: Securing USB-C PD and 12 V adapter outputs against accidental short-to-VBUS or hot-plug induced spikes. IC Role / Device Role / Timing Role: Secondary-stage overvoltage clamp downstream of primary DC/DC converter, acting as last-line defense before connected devices. Use Value: Limits output excursion to ≤64.5 V during fault conditions, preventing damage to downstream USB controllers, PMICs, or battery management ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CA-E3/5B | Same DO-214AA package and 40 V VWM, but rated for 600 W PPPM (vs. 800 W) and higher VC (69.4 V @ 10.3 A). | Limited to lower-energy surge environments (e.g., consumer USB ports); insufficient for IEC 61000-4-5 Level 4. | Select when cost sensitivity outweighs peak power headroom and AEC-Q101 is not required. |
| SMCJ40CAHE3/5B | DO-214AB (SMC) package with identical 40 V VWM and 800 W PPPM, but larger footprint (7.11 mm × 6.22 mm) and lower RθJA (35 °C/W). | Better thermal performance for high-duty-cycle surges; requires PCB layout revision due to larger pad area. | Choose when sustained surge repetition or ambient >85 °C demands enhanced thermal margin and board space permits. |
Compared with SMBJ40CA-E3/5B, SMB8J40CHE3/5B delivers 33% higher peak power and tighter clamping; versus SMCJ40CAHE3/5B, it trades thermal efficiency for compactness - making SMB8J40CHE3/5B optimal for space-constrained AEC-Q101 automotive modules where 800 W burst protection is mandatory.
Availability
SMB8J40CHE3/5B is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply with AEC-Q101 qualification and RoHS/whisker-resistant compliance.
Supply support for SMB8J40CHE3/5B 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMB8J series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust transient suppression in harsh environments where AEC-Q101 qualification, fast response, and repeatable clamping are non-negotiable.
FAQ
What does the 'HE3' suffix indicate in SMB8J40CHE3/5B?
The 'HE3' suffix in SMB8J40CHE3/5B denotes RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. This distinguishes it from commercial-grade 'E3' variants and confirms its suitability for automotive under-hood applications where long-term solder joint reliability under thermal cycling is critical. The SMB8J40CHE3/5B meets all stress tests defined in AEC-Q101 Rev D.
How does SMB8J40CHE3/5B differ from uni-directional SMB10J40A variants?
SMB8J40CHE3/5B is bi-directional with symmetrical clamping for AC-coupled or floating lines, while SMB10J40A is uni-directional and requires correct polarity alignment. The SMB8J40CHE3/5B has lower peak pulse power (800 W vs. 1000 W) and higher clamping voltage (64.5 V vs. 64.5 V same value but tested at lower IPPM), reflecting its dual-path avalanche structure. Its lack of cathode marking simplifies layout but prohibits use in DC-biased rectifier paths.
Is SMB8J40CHE3/5B compatible with lead-free reflow processes?
Yes, SMB8J40CHE3/5B is rated MSL Level 1 with a maximum peak reflow temperature of 260 °C, fully compatible with standard Pb-free soldering profiles (e.g., IPC/JEDEC J-STD-020). The matte tin plating meets J-STD-002 for solderability, and the UL 94 V-0 molding compound withstands repeated thermal excursions without delamination or charring. No pre-bake is required prior to assembly.
What is the significance of the '5B' in SMB8J40CHE3/5B?
The '5B' in SMB8J40CHE3/5B specifies the packaging format: 13-inch diameter plastic tape-and-reel containing 3200 units, optimized for high-speed pick-and-place machines. This contrasts with '52' (7-inch reel, 750 units) and enables efficient large-volume SMT production. The '5B' designation also implies full traceability per Vishay's lot-control system and compliance with ESD-safe handling protocols throughout distribution.
Can SMB8J40CHE3/5B be used in parallel for higher surge current handling?
No - SMB8J40CHE3/5B should not be paralleled due to parametric mismatch in VBR (44.4–49.1 V range) causing uneven current sharing and potential thermal runaway. For higher IPPM requirements, select a single higher-rated device like SMCJ40CAHE3/5B or use a hybrid approach with upstream current-limiting resistors. The SMB8J40CHE3/5B datasheet explicitly warns against paralleling without active balancing circuitry.
SMB8J40CHE3/5B 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):
- 11.2A
- Power - Peak Pulse:
- 800W
- 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 (SMB)
SMB8J40CHE3/5B FAQ
1.How can I place an order for SMB8J40CHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40CHE3/5B 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 SMB8J40CHE3/5B reliable?
The price and inventory of SMB8J40CHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J40CHE3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J40CHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40CHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40CHE3/5B?
SMB8J40CHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40CHE3/5B 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 SMB8J40CHE3/5B?
For technical support, including SMB8J40CHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40CHE3/5B requirements.
6.How does Aetrix verify that SMB8J40CHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J40CHE3/5B 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 SMB8J40CHE3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J40CHE3/5B?
All SMB8J40CHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40CHE3/5B, 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 SMB8J40CHE3/5B part is unused and in its original packaging.
Return procedure for SMB8J40CHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J40CHE3/5B Tags
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