My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMB8J40C-E3/5B
- Part No.:
- SMB8J40C-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40C-E3/5B.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,711
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMB8J40C-E3/5B 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 signal and power 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 in automotive sensor interfaces and industrial I/O protection where fast response and AEC-Q101 qualification are required.
For engineers reviewing the SMB8J40C-E3/5B datasheet, SMB8J40C-E3/5B pinout, SMB8J40C-E3/5B application, or SMB8J40C-E3/5B equivalent, key selection criteria include bi-directional clamping capability, 12.4 A surge current rating at 64.5 V clamping, AEC-Q101 qualification, RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bi-directional TVS diode operates symmetrically across both polarities, enabling robust protection against voltage transients from either direction without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while the low incremental surge resistance supports consistent clamping performance under repetitive surges.
The device meets J-STD-020 MSL Level 1 (peak reflow 260 °C) and is qualified to AEC-Q101 for automotive-grade reliability. Thermal resistance is specified at RθJA = 72 °C/W (typ.) and RθJL = 20 °C/W (typ.), indicating effective heat dissipation through leads when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min / max | 44.4 V / 49.1 V - Breakdown voltage range at 1.0 mA test current; ensures reliable turn-on within defined tolerance band. |
| VC @ IPPM | 64.5 V at 12.4 A - Clamping voltage during 10/1000 μs surge; limits downstream voltage stress to safe levels. |
| PPPM | 800 W - Peak pulse power handling capability; determines survivability against standardized lightning/surge events. |
| ID @ VWM | ≤1.0 μA - Reverse leakage current at stand-off voltage; minimizes standby power loss and signal interference. |
| TJ max | 150 °C - Maximum junction temperature; sets thermal design margin for sustained operation in hot environments. |
| Package | DO-214AA (SMB) - Surface-mount outline with 5.59 mm × 4.57 mm footprint; compatible with standard SMT pick-and-place and reflow profiles. |
Pinout & Package
DO-214AA (SMB) package: surface-mount, bi-directional device with no polarity marking; cathode band absent per bi-directional configuration. Two-terminal construction with symmetrical terminal geometry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Bi-directional terminals conduct equally in both directions during overvoltage events; no fixed anode/cathode assignment. |
| Case (body) | Thermal and mechanical interface | Plastic body provides electrical isolation; copper pad mounting enhances thermal dissipation per JEDEC layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, ADAS sensors, and infotainment I/O protection. |
| Glass-passivated junction | Ensures stable VBR over time and temperature, with reduced parameter drift versus epoxy-passivated alternatives. |
| MSL Level 1 rating | Enables single-pass reflow without moisture-related defects; eliminates pre-bake requirement for high-volume manufacturing. |
| RoHS-compliant matte tin plating | Meets J-STD-002 solderability and JESD22-B102 intermetallic formation requirements for long-term reliability. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Delivers tight voltage limiting relative to breakdown threshold, reducing risk of downstream component overstress. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed directly at connector or IC input pins to shunt surge energy before it reaches sensitive circuitry. Use Value: Withstands 800 W surges and clamps to ≤64.5 V, preserving signal integrity and preventing latch-up in 5 V–12 V automotive systems. | Use Scenario: Safeguarding digital and analog I/O channels on programmable logic controller modules exposed to field wiring transients. IC Role / Device Role / Timing Role: Primary surge suppression element on backplane or terminal block inputs, coordinated with upstream fusing. Use Value: 12.4 A IPPM rating and 72 °C/W thermal resistance enable reliable operation in 70 °C ambient industrial enclosures without derating. |
| Telecom Line Interface | Consumer Appliance Control Board |
Use Scenario: Protecting Ethernet PHY interfaces and RS-485 transceivers in network edge devices subjected to induced lightning surges. IC Role / Device Role / Timing Role: First-line defense on differential data lines, absorbing common-mode transients before signal conditioning stages. Use Value: Symmetrical bi-directional clamping ensures equal protection on both line polarities, critical for full-duplex communication links. | Use Scenario: Shielding microcontroller GPIOs and relay drivers on washing machine or HVAC control boards from motor commutation spikes. IC Role / Device Role / Timing Role: Localized TVS adjacent to switching elements and connectors to contain energy near source. Use Value: Fast response time and low leakage (<1.0 μA) prevent false triggering and standby current increase in battery-backed subsystems. |
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-E3/5B | Same DO-214AA package and 40 V VWM, but rated for 1000 W PPPM (uni-directional only); bi-directional variant not offered in SMBJ series. | Not suitable for bi-directional signal lines; requires polarity-aware layout and may misfire on negative transients. | Select SMB8J40C-E3/5B when protecting AC-coupled or differential buses where polarity is undefined. |
| SMCJ40CA | Larger DO-214AB (SMC) package; same 40 V VWM and 64.5 V VC, but higher 1500 W PPPM rating and lower RθJA (50 °C/W). | Better thermal performance and surge margin, but occupies ~2.5× PCB area; incompatible with dense layouts. | Choose SMCJ40CA only when system-level surge testing exceeds 800 W or ambient exceeds 105 °C. |
Compared with SMBJ40CA-E3/5B and SMCJ40CA, SMB8J40C-E3/5B uniquely balances bi-directional operation, AEC-Q101 qualification, and compact SMB footprint-making it optimal for space-constrained automotive and industrial signal protection where polarity independence is mandatory.
Availability
SMB8J40C-E3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, telecom line interfaces, and consumer appliance control boards requiring stable component supply and AEC-Q101 compliance.
Supply support for SMB8J40C-E3/5B 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMB8JxxCA series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, bi-directional transient suppression in automotive and industrial environments where AEC-Q101 validation and precise clamping are critical.
FAQ
What is the clamping voltage of SMB8J40C-E3/5B under a 10/1000 μs surge?
The SMB8J40C-E3/5B clamps to a maximum of 64.5 V when subjected to its rated peak pulse current of 12.4 A with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 standards and reflects worst-case voltage seen by downstream circuitry during surge events. The SMB8J40C-E3/5B maintains this clamping performance across its operational temperature range and after multiple surge cycles when mounted per recommended pad layout.
Is SMB8J40C-E3/5B suitable for automotive applications?
Yes, SMB8J40C-E3/5B is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, ADAS sensor interfaces, and infotainment systems. Its glass-passivated junction, MSL Level 1 reflow compatibility, and guaranteed performance from –55 °C to +150 °C junction temperature make it appropriate for under-hood and cabin-mounted electronics. The SMB8J40C-E3/5B meets stringent automotive reliability and qualification requirements without derating.
How does SMB8J40C-E3/5B differ from uni-directional SMBJ40A variants?
The SMB8J40C-E3/5B is bi-directional with symmetrical clamping in both polarities and no cathode band marking, whereas SMBJ40A is uni-directional with a cathode band and only clamps on reverse bias. SMB8J40C-E3/5B has lower PPPM (800 W vs. 1000 W) due to bi-directional architecture but enables polarity-agnostic placement on differential or AC-coupled lines. The SMB8J40C-E3/5B also carries AEC-Q101 qualification, unlike many SMBJ variants.
What is the maximum reverse leakage current for SMB8J40C-E3/5B at 40 V?
At 40 V stand-off voltage (VWM) and 25 °C, the SMB8J40C-E3/5B exhibits a maximum reverse leakage current (ID) of 1.0 μA. This low leakage preserves signal integrity in high-impedance sensor circuits and minimizes standby power loss in battery-operated systems. Leakage remains below 5.0 μA up to 125 °C ambient, as confirmed by Vishay's thermal derating curves in Document 88422.
Does SMB8J40C-E3/5B require special PCB layout considerations?
Yes - Vishay specifies mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 800 W PPPM and thermal performance. Smaller pads reduce surge capability and increase junction temperature. The SMB8J40C-E3/5B must be placed close to the protected interface (e.g., connector or IC pin) with short, low-inductance traces; ground paths should connect directly to solid ground plane to minimize clamping voltage overshoot during fast transients.
SMB8J40C-E3/5B 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J40C-E3/5B FAQ
1.How can I place an order for SMB8J40C-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40C-E3/5B 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 SMB8J40C-E3/5B reliable?
The price and inventory of SMB8J40C-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J40C-E3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J40C-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40C-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40C-E3/5B?
SMB8J40C-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40C-E3/5B 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 SMB8J40C-E3/5B?
For technical support, including SMB8J40C-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40C-E3/5B requirements.
6.How does Aetrix verify that SMB8J40C-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J40C-E3/5B 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 SMB8J40C-E3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J40C-E3/5B?
All SMB8J40C-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40C-E3/5B, 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 SMB8J40C-E3/5B part is unused and in its original packaging.
Return procedure for SMB8J40C-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J40C-E3/5B Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
