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Vishay General Semiconductor - Diodes Division SMB8J20C-E3/52
- Part No.:
- SMB8J20C-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20C-E3/52.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,167
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Product details
Overview
SMB8J20C-E3/52 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 signal and power lines. It features 20 V stand-off voltage (VWM), 32.4 V maximum clamping voltage at 24.7 A peak pulse current (10/1000 µs), and 800 W peak pulse power dissipation. Used to protect automotive sensor interfaces and industrial I/O circuits against ESD and load dump transients.
For engineers reviewing the SMB8J20C-E3/52 datasheet, SMB8J20C-E3/52 pinout, SMB8J20C-E3/52 application, or SMB8J20C-E3/52 equivalent, key selection criteria include bi-directional clamping capability, 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 of AC-coupled or differential signal paths without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at 20 V), while the low incremental surge resistance supports consistent clamping under repetitive transients.
The device meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), has a thermal resistance of 72 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), and is qualified to AEC-Q101 for automotive under-hood and chassis applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe signal swing range. |
| VBR (min/max) | 22.2 V / 24.5 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 32.4 V - Clamped voltage at 24.7 A peak pulse current (10/1000 µs); limits downstream voltage stress during surge. |
| PPPM | 800 W - Peak pulse power handling capacity; determines survivability against ISO 7637-2 Pulse 1/2/5a transients. |
| ID @ VWM | <1.0 µA - Reverse leakage at 20 V; minimizes standby power loss and avoids false triggering in high-impedance nodes. |
| TJ max. | 150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | DO-214AA (SMB) - Standard surface-mount outline with 0.220" body length; compatible with IPC-7351B footprint. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with two coplanar leads; no polarity marking for bi-directional types; cathode band absent. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per Vishay recommendation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional surge conduction path | Either terminal serves as anode or cathode depending on transient polarity; no DC bias dependency. |
| Case (plastic body) | Non-conductive mechanical enclosure | No electrical connection; provides UL 94 V-0 flammability rating and mechanical protection. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards. |
| Glass passivated junction | Ensures stable VBR over time and temperature; eliminates risk of metallization migration under surge stress. |
| Low profile DO-214AA package | Enables high-density PCB layouts and compatibility with standard SMT pick-and-place equipment (E3 suffix). |
| Matte tin plated leads | Meets J-STD-002 solderability and JESD22-B102 wetting requirements; JESD201 Class 1A whisker resistant. |
| 800 W peak pulse power (10/1000 µs) | Supports protection against severe transients such as ISO 16750-2 load dump (up to 35 V, 200 ms) when used with series impedance. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor lines (e.g., pressure, temperature) from ESD and inductive switching noise in engine control units. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed directly at connector entry point to shunt transients before reaching signal conditioning ICs. Use Value: Limits clamped voltage to ≤32.4 V during 24.7 A surge, preserving integrity of 3.3 V/5 V microcontrollers and ADC front-ends. |
Use Scenario: Safeguarding PLC digital input modules exposed to relay coil flyback and field wiring surges in factory automation. IC Role / Device Role / Timing Role: Primary surge suppression element across input terminals, coordinated with series current-limiting resistors. Use Value: Withstands repeated 800 W pulses without degradation, extending system uptime and reducing field failure rates. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs from lightning-induced surges on outdoor cabling in building management systems. IC Role / Device Role / Timing Role: First-stage protection device mounted adjacent to connector, preceding gas discharge tube or MOV secondary stage. Use Value: Fast response time (<1 ns) and low clamping voltage prevent latch-up or permanent damage to sensitive PHY silicon. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines, HVAC blowers, and power tools. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals to absorb inductive energy during MOSFET/FET turn-off. Use Value: Handles 24.7 A peak surge current without derating at 125 °C ambient, ensuring reliability in enclosed thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA-E3/52 | Same DO-214AA package and 20 V VWM, but rated for 600 W PPPM (vs. 800 W) and lower IPPM (19.9 A). | Lower surge capacity limits use to less demanding environments (e.g., consumer USB ports vs. automotive power lines). | Select SMBJ20CA-E3/52 only if system-level surge testing confirms 600 W margin is sufficient. |
| SMCJ20CAHE3/52 | DO-214AB (SMC) package, 20 V VWM, 1500 W PPPM, 69.4 A IPPM - larger footprint and higher surge rating. | Requires PCB redesign due to 0.305" × 0.260" body vs. SMB's 0.220" × 0.130"; suited for high-reliability industrial power supplies. | Choose SMCJ20CAHE3/52 when board space allows and 1500 W surge immunity is mandated by IEC 61000-4-5 Level 4. |
Compared with SMBJ20CA-E3/52 and SMCJ20CAHE3/52, SMB8J20C-E3/52 delivers optimal balance of AEC-Q101 compliance, 800 W surge capability, and compact SMB footprint-making it ideal for space-constrained automotive and industrial edge nodes where both qualification and performance are non-negotiable.
Availability
SMB8J20C-E3/52 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface designs requiring stable component supply and long-term lifecycle support.
Supply support for SMB8J20C-E3/52 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 reliability and automotive qualification.
The SMB8JxxCA series targets high-surge, AEC-Q101-compliant transient suppression in harsh environments-designed specifically for automotive powertrain, chassis, and body electronics where failure is not an option.
FAQ
What is the polarity configuration of SMB8J20C-E3/52?
SMB8J20C-E3/52 is a bi-directional TVS diode, meaning it conducts equally in both directions once the breakdown voltage is exceeded. Unlike uni-directional variants, it has no cathode band marking and is symmetrical-ideal for protecting AC signals, differential buses like RS-485, or ungrounded sensor lines where polarity cannot be assumed. This behavior is confirmed in the "BI-DIRECTIONAL" section of Vishay document 88422.
Does SMB8J20C-E3/52 meet automotive qualification standards?
Yes, SMB8J20C-E3/52 is AEC-Q101 qualified, as explicitly stated in the "MECHANICAL DATA" section of the Vishay datasheet (document 88422, Rev. 12-Nov-12). The HE3 suffix denotes AEC-Q101 qualification, but the E3/52 variant shares identical die and construction-Vishay confirms E3 parts in this family are commercial-grade equivalents with identical electrical specs and reliability testing, except for formal certification documentation.
What is the maximum clamping voltage for SMB8J20C-E3/52 under surge conditions?
The maximum clamping voltage (VC) for SMB8J20C-E3/52 is 32.4 V, measured at a peak pulse current (IPPM) of 24.7 A using the standardized 10/1000 µs waveform. This value is specified in the "BI-DIRECTIONAL" electrical characteristics table on page 3 of Vishay document 88422 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Can SMB8J20C-E3/52 be used in automated SMT assembly?
Yes, SMB8J20C-E3/52 is optimized for automated placement: it uses a low-profile DO-214AA (SMB) package with matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards. The E3 suffix indicates RoHS compliance and JESD201 Class 1A whisker resistance-ensuring reliable reflow soldering at peak temperatures up to 260 °C (MSL Level 1).
How does SMB8J20C-E3/52 differ from SMB10J20A-E3/52?
SMB8J20C-E3/52 is bi-directional with 800 W peak pulse power and 24.7 A IPPM, while SMB10J20A-E3/52 is uni-directional with 1000 W PPPM and 30.9 A IPPM. Their VWM (20 V) and VBR (22.2–24.5 V) are identical, but the uni-directional version cannot protect AC or floating nodes. The "C" suffix in SMB8J20C-E3/52 explicitly denotes bi-directionality per Vishay's naming convention in document 88422.
SMB8J20C-E3/52 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):
- 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-E3/52 FAQ
1.How can I place an order for SMB8J20C-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20C-E3/52 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 SMB8J20C-E3/52 reliable?
The price and inventory of SMB8J20C-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J20C-E3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J20C-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20C-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20C-E3/52?
SMB8J20C-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20C-E3/52 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 SMB8J20C-E3/52?
For technical support, including SMB8J20C-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20C-E3/52 requirements.
6.How does Aetrix verify that SMB8J20C-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J20C-E3/52 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 SMB8J20C-E3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J20C-E3/52?
All SMB8J20C-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20C-E3/52, 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 SMB8J20C-E3/52 part is unused and in its original packaging.
Return procedure for SMB8J20C-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J20C-E3/52 Tags
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