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Vishay General Semiconductor - Diodes Division SMB8J20C-E3/5B
- Part No.:
- SMB8J20C-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20C-E3/5B.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J20C-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 a 20 V stand-off voltage (VWM), 32.4 V maximum clamping voltage (VC) at 24.7 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 and industrial I/O circuits against ESD and load dump transients.
For engineers reviewing the SMB8J20C-E3/5B datasheet, SMB8J20C-E3/5B pinout, SMB8J20C-E3/5B application, or SMB8J20C-E3/5B equivalent, key selection criteria include bi-directional clamping capability, low thermal resistance (RθJL = 20 °C/W), RoHS-compliant matte tin plating, and MSL Level 1 moisture sensitivity rating for lead-free reflow compatibility.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transients exceeding its 22.2–24.5 V breakdown voltage (VBR) at 1 mA test current. Its glass-passivated junction ensures stable leakage (<1 µA at VWM = 20 V) and repeatable clamping performance under repetitive surges.
Designed per ANSI/IEEE C62.35, it delivers 800 W peak pulse power handling with low incremental surge resistance, enabling robust protection of 12 V and 24 V automotive and industrial bus lines without upstream current limiting. The bi-directional symmetry eliminates polarity concerns in AC-coupled or differential signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 12 V/24 V systems. |
| VBR (min/max) | 22.2 V / 24.5 V - Breakdown occurs within this range at 1 mA; ensures reliable triggering above system nominal voltage. |
| VC @ IPPM | 32.4 V - Clamped voltage seen by protected circuit during 24.7 A 10/1000 µs surge; limits stress on downstream ICs. |
| PPPM | 800 W - Peak transient power dissipation capability; supports ISO 7637-2 Pulse 1/2/5a compliance in automotive applications. |
| IPPM | 24.7 A - Maximum non-repetitive surge current it can safely divert without degradation. |
| TJ max | 150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| RθJL | 20 °C/W - Low junction-to-lead thermal resistance; improves power handling during repeated transients with minimal PCB copper. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional device with no polarity marking - symmetrical terminals suitable for AC or differential line protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Bi-directional conduction - either terminal serves as anode or cathode depending on transient polarity; no color band or marking required. |
| Case (body) | Thermal path | DO-214AA molded body provides mechanical stability and contributes to thermal dissipation via PCB pad coupling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and surge endurance - suitable for engine control, ADAS, and body electronics. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage over lifetime; prevents parameter drift due to environmental contamination or moisture ingress. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without baking; eliminates pre-conditioning requirements for high-volume SMT assembly. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation material meets flammability safety standards for enclosed industrial and automotive enclosures. |
| Matte tin plated leads | RoHS-compliant terminations with J-STD-002 solderability and JESD22-B102 durability - ensures consistent wetting and joint integrity. |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN transceivers and analog sensor front-ends (e.g., pressure, temperature) from ISO 16750-2 load dump and ESD events. IC Role / Device Role / Timing Role: Bi-directional shunt clamp placed directly at connector entry point to limit transient voltage before reaching signal conditioning ICs. Use Value: Clamps 24.7 A surges to ≤32.4 V, preserving signal integrity and preventing latch-up in 3.3 V/5 V microcontrollers and ADCs. | Use Scenario: Safeguarding 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers against field wiring transients and ground bounce. IC Role / Device Role / Timing Role: Primary overvoltage protector on input terminals, coordinated with series impedance and filtering to meet IEC 61000-4-5 Level 3 (2 kV/1 kA). Use Value: Withstands 800 W pulses without degradation, enabling long-term reliability in factory-floor environments with frequent motor switching noise. |
| USB Type-C Port Protection | DC Power Rail Surge Suppression |
Use Scenario: Guarding USB 2.0 differential data lines (D+/D−) and VBUS against ESD (IEC 61000-4-2 ±15 kV air) and hot-swap overshoot. IC Role / Device Role / Timing Role: Bi-directional TVS placed adjacent to connector to clamp both polarities of fast transients before USB PHY or controller. Use Value: Sub-nanosecond response and 32.4 V clamping prevent damage to 3.3 V USB transceivers while maintaining signal rise/fall time integrity. | Use Scenario: Suppressing load-dump spikes (up to 60 V, 400 ms) on 24 V DC power rails feeding motor drivers and solenoid controllers. IC Role / Device Role / Timing Role: Parallel-connected shunt device across rail, sized to absorb energy without thermal runaway during extended overvoltage events. Use Value: 150 °C max junction temperature and 20 °C/W RθJL allow sustained operation with minimal heatsinking in compact industrial power modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA | Same DO-214AA package, identical VWM/VC, but rated for 600 W PPPM (vs. 800 W for SMB8J20C-E3/5B); lower IPPM (20.7 A). | Less robust for high-energy automotive load dump; suitable for lower-tier consumer or telecom surge requirements. | Select SMBJ20CA only if system-level testing confirms 600 W is sufficient and cost is prioritized over margin. |
| SMCJ20CA | Larger DO-214AB (SMC) package; same electrical specs but higher 1500 W PPPM rating and 34.4 A IPPM; RθJA = 19 °C/W vs. 72 °C/W for SMB8J20C-E3/5B. | Requires larger PCB footprint; better thermal performance under sustained surge duty cycles. | Choose SMCJ20CA when layout allows extra space and application demands higher single-pulse energy absorption. |
Compared with SMBJ20CA and SMCJ20CA, SMB8J20C-E3/5B delivers optimal balance of 800 W surge capacity, compact SMB footprint, and AEC-Q101 qualification - making it the preferred choice for space-constrained automotive and industrial designs requiring certified reliability without SMC-level board area.
Availability
SMB8J20C-E3/5B is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and USB interface surge suppression requiring stable component supply and full traceability.
Supply support for SMB8J20C-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 SMB8J series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in harsh automotive and industrial environments where compact size and repeatable clamping are critical.
FAQ
What is the clamping voltage of SMB8J20C-E3/5B at its rated peak pulse current?
The SMB8J20C-E3/5B has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated 24.7 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured at TA = 25 °C and ensures protected circuits experience limited overvoltage stress during surge events. The SMB8J20C-E3/5B maintains this clamping performance across its specified operating temperature range.
Is SMB8J20C-E3/5B suitable for automotive applications?
Yes, SMB8J20C-E3/5B is AEC-Q101 qualified and explicitly designed for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its glass-passivated junction, MSL Level 1 rating, and guaranteed performance from −55 °C to +150 °C make SMB8J20C-E3/5B compliant with automotive reliability and thermal requirements.
What does the "C" suffix in SMB8J20C-E3/5B indicate?
The "C" in SMB8J20C-E3/5B denotes bi-directional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike uni-directional variants (e.g., SMB8J20A), SMB8J20C-E3/5B has no polarity marking and is used where AC signals, differential pairs, or undefined transient polarity exist.
How does SMB8J20C-E3/5B differ from SMBJ20CA?
SMB8J20C-E3/5B offers higher peak pulse power (800 W vs. 600 W) and greater peak pulse current (24.7 A vs. 20.7 A) than SMBJ20CA, while sharing identical VWM (20 V), VC (32.4 V), and DO-214AA package. Both are bi-directional and AEC-Q101 qualified, but SMB8J20C-E3/5B provides enhanced surge margin for demanding automotive load-dump scenarios.
What is the thermal resistance from junction to lead for SMB8J20C-E3/5B?
The SMB8J20C-E3/5B has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, measured under standard mounting conditions. This low value enables efficient heat transfer from the silicon die to the PCB pads through the leads, supporting higher surge repetition rates and improved reliability in thermally constrained layouts. This specification is confirmed in Vishay document 88422.
SMB8J20C-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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 22.3A
- 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)
SMB8J20C-E3/5B FAQ
1.How can I place an order for SMB8J20C-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20C-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 SMB8J20C-E3/5B reliable?
The price and inventory of SMB8J20C-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 SMB8J20C-E3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J20C-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20C-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20C-E3/5B?
SMB8J20C-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20C-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 SMB8J20C-E3/5B?
For technical support, including SMB8J20C-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20C-E3/5B requirements.
6.How does Aetrix verify that SMB8J20C-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J20C-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 SMB8J20C-E3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J20C-E3/5B?
All SMB8J20C-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20C-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 SMB8J20C-E3/5B part is unused and in its original packaging.
Return procedure for SMB8J20C-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J20C-E3/5B Tags
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