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Vishay General Semiconductor - Diodes Division SMB8J20CHE3/5B
- Part No.:
- SMB8J20CHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20CHE3/5B.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,395
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Product details
Overview
SMB8J20CHE3/5B 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 20 V stand-off voltage (VWM), 32.4 V clamping voltage (VC) at 24.7 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform. Used to protect automotive sensor interfaces and industrial I/O lines against ESD and load dump transients.
For engineers reviewing the SMB8J20CHE3/5B datasheet, SMB8J20CHE3/5B pinout, SMB8J20CHE3/5B application, or SMB8J20CHE3/5B equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, RoHS-compliant HE3 whisker-tested terminations, and thermal resistance (RθJA = 72 °C/W) for board-level thermal design validation.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal bias it presents high impedance (>1 µA leakage at 20 V), but triggers into low-impedance conduction when reverse voltage exceeds its 22.2–24.5 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable avalanche characteristics and fast response (<1 ns).
Designed for unidirectional or bi-directional configurations, SMB8J20CHE3/5B uses symmetrical junction architecture enabling equal clamping in both polarities - critical for AC-coupled data lines and differential bus protection where polarity reversal occurs. It meets MSL Level 1 per J-STD-020 and supports peak reflow up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe working margin below clamping threshold |
| VBR min/max | 22.2 V / 24.5 V - guaranteed avalanche onset range at 1 mA test current; ensures consistent turn-on across production lots |
| VC @ IPPM | 32.4 V at 24.7 A - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient overvoltage exposure |
| PPPM | 800 W - peak pulse power handling with 10/1000 µs waveform; defines single-event surge energy absorption capacity |
| RθJA | 72 °C/W - junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; enables thermal derating calculations above 25 °C ambient |
| TJ max | 150 °C - maximum junction temperature; sets upper limit for sustained power dissipation and pulse repetition rate |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per AEC stress test plan |
Pinout & Package
DO-214AA (SMB) surface-mount package: molded epoxy case with matte tin-plated leads, 0.205"–0.220" body length, cathode band marking absent (bi-directional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche junction terminals | No polarity marking; either terminal serves as anode or cathode depending on applied voltage polarity - enables AC line protection without orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables protection of AC-coupled or differential signals (e.g., CAN, RS-485) without external polarity management circuitry |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, chassis, and ADAS modules requiring extended temperature operation and long-term reliability |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage drift over time and temperature - critical for precision sensor interface protection |
| MSL Level 1 rating | Supports lead-free reflow assembly at 260 °C peak without moisture-induced popcorn failure - eliminates bake preconditioning |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a), improving system-level immunity margin |
Applications
| Automotive Sensor Interface | Industrial I/O Protection |
|---|---|
Use Scenario: Protecting analog outputs of pressure/temperature sensors in engine control units exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt TVS placed between signal line and ground to clamp transients before reaching ADC input or op-amp buffer. Use Value: Limits voltage excursion to ≤32.4 V during 24.7 A surges, preserving signal integrity and preventing latch-up in downstream ASICs. |
Use Scenario: Safeguarding 24 V DC digital input channels on PLC modules subjected to inductive switching noise from solenoid valves. IC Role / Device Role / Timing Role: Standoff protector on field-side input traces, absorbing repetitive 800 W pulses without degradation. Use Value: Maintains <1 µA leakage at 20 V operating voltage while surviving >1000 surges per JEDEC JESD22-A114, ensuring long-term channel stability. |
| Telecom Line Interface | Consumer USB Port Protection |
Use Scenario: Bi-directional surge suppression on RS-485 bus lines in base station remote units facing lightning-induced common-mode transients. IC Role / Device Role / Timing Role: Differential pair protector with symmetrical clamping to prevent data corruption during ±32.4 V overvoltage events. Use Value: Matches differential signaling requirements with no polarity dependency - simplifies PCB layout and reduces BOM count vs. dual unidirectional devices. |
Use Scenario: ESD and surge protection on VBUS and D+/D− lines of USB 2.0 ports in smart home hubs exposed to human-body-model discharges. IC Role / Device Role / Timing Role: Low-capacitance shunt element (typ. <100 pF at 0 V) minimizing signal distortion on high-speed data lines. Use Value: Clamps 8 kV contact ESD per IEC 61000-4-2 to <32.4 V within <1 ns, preventing PHY layer damage without degrading eye diagram. |
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-E3/5B | Same DO-214AA package and 20 V VWM, but rated for 600 W PPPM (vs. 800 W) and 19.0 A IPPM (vs. 24.7 A); non-AEC-Q101 | Lacks automotive qualification and lower surge margin; suitable for commercial-grade industrial controls only | Select when cost sensitivity outweighs automotive compliance or higher surge headroom |
| SMCJ20CAHE3/5B | DO-214AB (SMC) package, same 20 V VWM and AEC-Q101, but 1500 W PPPM and 43.1 A IPPM; larger footprint (7.11 mm × 6.22 mm) | Higher power handling requires more PCB area; better suited for main power rail protection than signal lines | Choose for systems needing >800 W surge capacity where board space permits larger SMC package |
Compared with SMBJ20CA-E3/5B and SMCJ20CAHE3/5B, SMB8J20CHE3/5B delivers optimal balance of automotive qualification, 800 W surge rating, and compact SMB footprint - making it preferred for space-constrained automotive sensor nodes and industrial I/O modules requiring validated reliability.
Availability
SMB8J20CHE3/5B is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, and telecom infrastructure equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMB8J20CHE3/5B 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, MOSFETs, optoelectronics, and passive components with emphasis on high-reliability and automotive-grade solutions.
SMB8J20CHE3/5B belongs to Vishay's TRANSZORB® family of high-power-density TVS diodes, engineered specifically for robust transient suppression in harsh environments including automotive, industrial, and telecom applications.
FAQ
What is the clamping voltage of SMB8J20CHE3/5B at its rated peak pulse current?
The SMB8J20CHE3/5B has a maximum clamping voltage (VC) of 32.4 V when subjected to its specified peak pulse current (IPPM) of 24.7 A using the 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMB8J20CHE3/5B maintains this clamping performance consistently due to its glass-passivated junction and low incremental surge resistance.
Is SMB8J20CHE3/5B suitable for automotive applications?
Yes, SMB8J20CHE3/5B is AEC-Q101 qualified and explicitly rated for automotive use, including engine control, chassis, and ADAS subsystems. Its qualification covers temperature cycling, highly accelerated life testing (HALT), and ESD robustness per the AEC stress test plan. The HE3 suffix confirms compliance with JESD201 Class 2 whisker testing, and the device meets MSL Level 1 for lead-free reflow - all critical for automotive manufacturing and field reliability. SMB8J20CHE3/5B is documented in Vishay's automotive-grade product portfolio.
What does the 'HE3' suffix indicate in SMB8J20CHE3/5B?
The 'HE3' suffix in SMB8J20CHE3/5B denotes two key attributes: 'H' indicates AEC-Q101 qualification, and 'E3' specifies RoHS-compliant construction with matte tin plating that meets JESD201 Class 1A whisker testing. This distinguishes it from commercial-grade 'E3' variants (e.g., SMB8J20CA-E3/5B) which lack automotive qualification. The HE3 marking is verified in Vishay's official ordering information table and product change notices, confirming its suitability for mission-critical automotive designs.
How does SMB8J20CHE3/5B differ from unidirectional TVS diodes like SMB10J20A?
SMB8J20CHE3/5B is bi-directional with symmetrical breakdown and clamping behavior in both polarities, whereas SMB10J20A is unidirectional and conducts only in reverse bias. This makes SMB8J20CHE3/5B appropriate for AC-coupled or differential signal lines (e.g., CAN, RS-485), while SMB10J20A suits DC power rails or single-ended signals with defined polarity. SMB8J20CHE3/5B also has lower PPPM (800 W vs. 1000 W) and different IPPM (24.7 A vs. 30.9 A), reflecting its optimized bi-directional architecture. Both share DO-214AA packaging and AEC-Q101 qualification in HE3 variants.
What is the thermal resistance specification for SMB8J20CHE3/5B?
The SMB8J20CHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay's datasheet Document Number 88422. This value is essential for calculating allowable power dissipation at elevated ambient temperatures and verifying thermal safety margins during repetitive surge events. RθJA directly impacts derating curves shown in Figure 2 of the datasheet and must be used with actual board layout copper area to ensure TJ remains ≤150 °C.
SMB8J20CHE3/5B 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J20CHE3/5B FAQ
1.How can I place an order for SMB8J20CHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20CHE3/5B 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 SMB8J20CHE3/5B reliable?
The price and inventory of SMB8J20CHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J20CHE3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J20CHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20CHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20CHE3/5B?
SMB8J20CHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20CHE3/5B 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 SMB8J20CHE3/5B?
For technical support, including SMB8J20CHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20CHE3/5B requirements.
6.How does Aetrix verify that SMB8J20CHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J20CHE3/5B 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 SMB8J20CHE3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J20CHE3/5B?
All SMB8J20CHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20CHE3/5B, 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 SMB8J20CHE3/5B part is unused and in its original packaging.
Return procedure for SMB8J20CHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J20CHE3/5B Tags
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