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Vishay General Semiconductor - Diodes Division SMB8J40CHE3/52
- Part No.:
- SMB8J40CHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40CHE3/52.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,115
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Product details
Overview
SMB8J40CHE3/52 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. It is AEC-Q101 qualified and used to protect automotive sensor interfaces against ISO 7637-2 load dump and ESD transients.
For engineers reviewing the SMB8J40CHE3/52 datasheet, SMB8J40CHE3/52 pinout, SMB8J40CHE3/52 application, or SMB8J40CHE3/52 equivalent, key selection criteria include clamping performance under 10/1000 μs surge, bi-directional symmetry for AC-coupled lines, AEC-Q101 qualification status, thermal resistance (RθJA = 72 °C/W), and RoHS-compliant matte tin plating per J-STD-002.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling protection of differential or AC signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 μA at VWM), while the DO-214AA package supports automated SMT placement and meets MSL level 1 (260 °C peak reflow).
The device complies with ANSI/IEEE C62.35 for surge testing and delivers consistent clamping up to 12.4 A IPPM with VC ≤ 64.5 V - critical for safeguarding 3.3 V/5 V/12 V interface ICs in automotive ECUs and industrial I/O modules where voltage margin below system rail is tightly constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before conduction begins; defines safe operating window for 42 V automotive systems. |
| VBR min/max | 44.4 V / 49.1 V at 1 mA - guaranteed breakdown threshold range ensures reliable triggering above VWM with margin against false trips. |
| VC @ IPPM | 64.5 V at 12.4 A (10/1000 μs) - clamping voltage limits transient energy delivered to downstream circuitry during surge events. |
| PPPM | 800 W - peak pulse power handling capacity determines survivability against standardized lightning or load-dump surges. |
| RθJA | 72 °C/W - thermal resistance from junction to ambient dictates derating requirements in enclosed or high-TA environments. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per stress test conditions. |
| RoHS & Whisker | HE3 suffix: RoHS-compliant + JESD 201 Class 2 whisker resistance - suitable for long-life automotive and industrial deployments. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band omitted (bi-directional type). Two-terminal device: anode and cathode are functionally interchangeable due to symmetrical construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current entry (positive polarity) | Accepts transient current during positive half-cycle; forms one side of symmetrical clamping path. |
| Cathode | Surge current entry (negative polarity) | Accepts transient current during negative half-cycle; identical electrical behavior to anode due to bi-directional design. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping symmetry | Identical VBR, VC, and IPPM performance for both polarities - eliminates need for polarity-aware layout in AC or differential lines. |
| Glass-passivated junction | Stable, repeatable breakdown characteristics over lifetime and temperature - reduces parameter drift in harsh environments. |
| Low incremental surge resistance | Enables tighter VC control under high-current transients - improves protection margin for sensitive 3.3 V logic and CAN transceivers. |
| MSL Level 1 rating | Compatible with standard 260 °C lead-free reflow profiles without preconditioning - simplifies manufacturing integration. |
| AEC-Q101 qualification | Validated for automotive underhood and body-control applications requiring extended temperature (-55 °C to +150 °C) and reliability compliance. |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) in engine control units exposed to ISO 7637-2 Pulse 5a (load dump) and ESD. IC Role / Device Role: Primary surge clamp placed directly at connector entry point before signal conditioning circuitry. Use Value: Limits induced transients to ≤64.5 V, preserving integrity of 5 V supply rails and preventing latch-up in downstream op-amps and ADCs. | Use Scenario: Shielding RS-485 transceivers (e.g., SN65HVD230) on factory-floor communication lines subject to ground bounce and lightning-induced surges. IC Role / Device Role: Bi-directional TVS across differential pair (A–B) and common-mode line to earth/chassis. Use Value: Maintains signal integrity by clamping common-mode surges without distorting differential swing, thanks to matched VBR symmetry. |
| Consumer Power Adapter Input | Smart Meter AC Mains Interface |
Use Scenario: Secondary-side DC input protection in USB-C PD adapters and wireless charging bases subjected to conducted EFT (IEC 61000-4-4). IC Role / Device Role: Standoff-rated TVS on 12–20 V DC bus feeding buck controllers and USB port regulators. Use Value: Absorbs 800 W pulses without degradation, ensuring no secondary failure mode propagates to isolated feedback circuitry. | Use Scenario: Surge suppression on AC voltage sensing inputs of smart electricity meters compliant with IEC 61000-4-5 (1.2/50 μs + 8/20 μs combo wave). IC Role / Device Role: First-stage clamp ahead of precision resistive divider and isolation amplifier. Use Value: Prevents meter calibration drift by limiting transient overvoltage to <65 V, well below ADC input absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CA-E3/52 | Same DO-214AA package and 40 V VWM, but rated for 600 W PPPM (vs. 800 W) and higher VC (69.4 V at 10.5 A). | Limited to lower-energy surge environments; not recommended for automotive load dump where 800 W capability is required. | Select SMB8J40CHE3/52 when full 800 W surge immunity and AEC-Q101 qualification are mandatory. |
| SMCJ40CAHE3/A | DO-214AB (SMC) package, same VWM and AEC-Q101 rating, but higher PPPM (1500 W) and lower RθJA (30 °C/W). | Better thermal performance and surge headroom, but larger footprint (7.11 × 6.22 mm vs. 4.57 × 3.94 mm) may constrain PCB space. | Choose SMCJ40CAHE3/A only if board layout allows larger SMC package and higher surge margin is needed beyond 800 W. |
Compared with SMBJ40CA-E3/52 and SMCJ40CAHE3/A, SMB8J40CHE3/52 uniquely balances AEC-Q101 compliance, 800 W surge rating, and compact DO-214AA footprint - making it optimal for space-constrained automotive and industrial modules requiring certified reliability without thermal derating penalties.
Availability
SMB8J40CHE3/52 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial RS-485 interface hardening, and smart meter AC sensing applications requiring stable component supply and long-term lifecycle support.
Supply support for SMB8J40CHE3/52 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 automotive, industrial, and computing applications.
The SMB8J series belongs to Vishay's TRANSZORB® family of high-power-density TVS diodes, engineered specifically for AEC-Q101-compliant surge protection in harsh-environment electronics where reliability and repeatable clamping performance are non-negotiable.
FAQ
What is the peak pulse power rating of SMB8J40CHE3/52?
The SMB8J40CHE3/52 has a peak pulse power rating (PPPM) of 800 W under the standard 10/1000 μs waveform. This value is measured with the device mounted on 0.2" × 0.2" copper pads per terminal and reflects its ability to absorb high-energy transients without failure. The 800 W rating distinguishes SMB8J40CHE3/52 from lower-rated variants like SMBJ40CA-E3/52 (600 W), making it suitable for demanding automotive load-dump protection scenarios where SMB8J40CHE3/52 must sustain repeated surges.
Is SMB8J40CHE3/52 unidirectional or bidirectional?
SMB8J40CHE3/52 is a bi-directional transient voltage suppressor, meaning it provides symmetrical clamping for both positive and negative voltage transients. Its datasheet specifies identical breakdown voltage (VBR), clamping voltage (VC), and peak pulse current (IPPM) values for either polarity. This bi-directional behavior makes SMB8J40CHE3/52 ideal for protecting AC-coupled lines, differential buses like RS-485, and any application where polarity cannot be assumed - unlike unidirectional variants such as SMB10J40A.
Does SMB8J40CHE3/52 meet automotive qualification standards?
Yes, SMB8J40CHE3/52 is AEC-Q101 qualified, as confirmed by its HE3 suffix and explicit listing in Vishay's AEC-Q101-certified product documentation. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD robustness, validating SMB8J40CHE3/52 for use in automotive powertrain, chassis, and body electronics. The HE3 marking also denotes RoHS compliance and JESD 201 Class 2 whisker resistance - essential for long-life automotive deployments.
What is the clamping voltage of SMB8J40CHE3/52 at its rated peak pulse current?
The maximum clamping voltage (VC) of SMB8J40CHE3/52 is 64.5 V at 12.4 A peak pulse current (IPPM), tested with the standard 10/1000 μs waveform. This VC value defines the upper voltage limit imposed on protected circuitry during a surge event. Because SMB8J40CHE3/52 maintains this clamping performance across its full operating temperature range and after multiple surges, it ensures predictable protection margins for 42 V automotive systems and 36 V industrial rails where overvoltage must stay below IC absolute maximum ratings.
What package type does SMB8J40CHE3/52 use, and what are its mounting requirements?
SMB8J40CHE3/52 uses the DO-214AA (SMB) surface-mount package, measuring 4.57 mm × 3.94 mm with a maximum height of 2.20 mm. Per Vishay's thermal characterization, it requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads on each terminal for rated power dissipation. The device is MSL Level 1 and compatible with standard lead-free reflow profiles peaking at 260 °C. No polarity marking is present on SMB8J40CHE3/52 due to its bi-directional construction - simplifying placement and reducing assembly errors.
SMB8J40CHE3/52 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)
SMB8J40CHE3/52 FAQ
1.How can I place an order for SMB8J40CHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40CHE3/52 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 SMB8J40CHE3/52 reliable?
The price and inventory of SMB8J40CHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J40CHE3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J40CHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40CHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40CHE3/52?
SMB8J40CHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40CHE3/52 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 SMB8J40CHE3/52?
For technical support, including SMB8J40CHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40CHE3/52 requirements.
6.How does Aetrix verify that SMB8J40CHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J40CHE3/52 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 SMB8J40CHE3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J40CHE3/52?
All SMB8J40CHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40CHE3/52, 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 SMB8J40CHE3/52 part is unused and in its original packaging.
Return procedure for SMB8J40CHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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