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Vishay General Semiconductor - Diodes Division SMB8J20CHE3/52
- Part No.:
- SMB8J20CHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20CHE3/52.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,517
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Product details
Overview
SMB8J20CHE3/52 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 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. Used to protect automotive sensor interfaces, industrial I/O ports, and telecom line drivers against ESD and lightning-induced transients.
For engineers reviewing the SMB8J20CHE3/52 datasheet, SMB8J20CHE3/52 pinout, SMB8J20CHE3/52 application, or SMB8J20CHE3/52 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 72 °C/W), junction-to-lead resistance (RθJL = 20 °C/W), and bi-directional clamping behavior critical for robust overvoltage design.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports fast energy dissipation during 8.3 ms surges up to 100 A (uni-directional rating, not applicable here).
The device meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow peak temperature, and its DO-214AA package provides 72 °C/W junction-to-ambient thermal resistance when mounted on 5.0 mm × 5.0 mm copper pads - essential for sustained surge duty cycles in automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 22.2 V / 24.5 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 32.4 V - Clamped voltage seen by downstream circuit at 24.7 A peak pulse current; limits stress on ICs during transients. |
| PPPM | 800 W - Peak pulse power handling capability with 10/1000 µs waveform; quantifies single-event surge energy absorption. |
| ID @ VWM | <1.0 µA - Reverse leakage at stand-off voltage; negligible loading on high-impedance sensor or communication lines. |
| TJ max. | 150 °C - Maximum junction temperature; enables operation in under-hood automotive or industrial ambient conditions. |
| RθJA | 72 °C/W - Thermal resistance from junction to ambient on standard 5.0 mm × 5.0 mm pad layout; informs thermal derating requirements. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional configuration with no polarity marking - symmetrical terminals suitable for AC or differential line protection.
| 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 color band or marking required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and leakage performance across temperature and life cycles. |
| MSL Level 1 | Supports standard SMT reflow without dry-pack or baking requirements - simplifies manufacturing logistics. |
| UL 94 V-0 molding compound | Flame-retardant encapsulation meets safety standards for enclosed industrial and automotive enclosures. |
| Matte tin plated leads | RoHS-compliant terminations solderable per J-STD-002 and JESD 22-B102; HE3 suffix passes JESD 201 Class 2 whisker test. |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional clamping element placed between signal line and ground, absorbing transients before they reach MCU or analog front-end. Use Value: Limits voltage excursion to ≤32.4 V during 24.7 A surges, preserving signal integrity and preventing latch-up in AEC-Q100 qualified ICs. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., SN65HVD230) in factory automation networks exposed to motor switching noise. IC Role / Device Role / Timing Role: Line-side TVS connected across differential pair (A/B) and ground, suppressing common-mode and differential-mode transients. Use Value: With 800 W PPPM and sub-µA leakage, it avoids signal distortion while maintaining bus reliability under repetitive 1 kV EFT bursts. |
| Telecom Line Driver Protection | Consumer USB Port ESD Suppression |
Use Scenario: Shielding xDSL or POTS line drivers from lightning-induced surges on outside plant wiring entering building premises equipment. IC Role / Device Role / Timing Role: Primary surge arrestor placed at line entry point, upstream of transformer and integrated line driver IC. Use Value: Clamps 10/1000 µs surges to 32.4 V before energy reaches sensitive amplifier stages, meeting ITU-T K.20/21 immunity requirements. |
Use Scenario: Adding secondary-level ESD protection on USB 2.0 D+/D− lines in set-top boxes or smart displays where internal ICs lack full IEC 61000-4-2 level 4 tolerance. IC Role / Device Role / Timing Role: Low-capacitance bi-directional TVS shunting transient energy from data lines to ground during contact discharge events. Use Value: Delivers 30 kV air/20 kV contact ESD protection without degrading 480 Mbps signal integrity due to minimal parasitic capacitance. |
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 higher VC (34.0 V vs. 32.4 V) at lower IPPM (17.5 A). | Lower surge capacity makes it suitable only for lighter-duty consumer or non-AEC-Q101 industrial use. | Select SMBJ20CA-E3/52 only if system-level surge testing confirms 600 W sufficiency and AEC-Q101 is not required. |
| SMCJ20CAHE3/52 | DO-214AB (SMC) package, same 20 V VWM, but rated for 1500 W PPPM and lower RθJA (35 °C/W), requiring larger PCB area. | Higher power handling suits 48 V automotive systems or industrial PLC backplanes with frequent high-energy transients. | Choose SMCJ20CAHE3/52 when 800 W is insufficient and board space allows larger SMC footprint with improved thermal performance. |
Compared with SMBJ20CA-E3/52 and SMCJ20CAHE3/52, SMB8J20CHE3/52 uniquely balances AEC-Q101 compliance, 800 W surge rating, and compact SMB footprint - making it optimal for space-constrained automotive modules needing validated reliability without SMC-level board real estate.
Availability
SMB8J20CHE3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, and telecom line driver protection requiring stable component supply and long-term lifecycle support.
Supply support for SMB8J20CHE3/52 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
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 automotive and industrial environments.
FAQ
What is the clamping voltage of SMB8J20CHE3/52 at its rated peak pulse current?
The SMB8J20CHE3/52 has a maximum clamping voltage (VC) of 32.4 V at 24.7 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMB8J20CHE3/52 maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMB8J20CHE3/52 suitable for automotive applications?
Yes, SMB8J20CHE3/52 is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junctions, matte tin-plated leads compliant with JESD 201 Class 2 whisker testing, and MSL Level 1 moisture sensitivity - all validated for under-hood and chassis-mounted modules. The SMB8J20CHE3/52 meets requirements for engine control units, ADAS camera links, and body electronics subject to ISO 7637-2 and ISO 16750-2 stress profiles.
How does the bi-directional configuration of SMB8J20CHE3/52 affect its placement on a PCB?
The SMB8J20CHE3/52 has no polarity marking and functions identically regardless of orientation, allowing flexible placement across differential pairs or AC-coupled lines without concern for anode/cathode alignment. This eliminates assembly errors and simplifies layout for balanced interfaces like RS-422, RS-485, or Ethernet PHYs. Unlike uni-directional TVS diodes, the SMB8J20CHE3/52 requires no color band verification during automated optical inspection or manual rework.
What is the thermal resistance of SMB8J20CHE3/52, and how does it impact layout?
The SMB8J20CHE3/52 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. This value assumes standard FR-4 PCB with no internal planes. To maintain TJ ≤ 150 °C during repeated surges, designers must ensure adequate copper area and consider derating per Figure 2 in the Vishay datasheet 88422. The SMB8J20CHE3/52 also exhibits RθJL = 20 °C/W, supporting localized heat sinking via thermal vias under the leads.
Does SMB8J20CHE3/52 meet RoHS and halogen-free requirements?
Yes, SMB8J20CHE3/52 carries the HE3 suffix, indicating RoHS-compliant construction per Directive 2011/65/EU and halogen-free compliance per JEDEC JS709A. The molding compound meets UL 94 V-0 flammability rating, and the matte tin plating satisfies J-STD-002 solderability and JESD 22-B102 mechanical robustness standards. These certifications are documented in Vishay's material category policy (doc. 99912) and apply to the full SMB8J series.
SMB8J20CHE3/52 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J20CHE3/52 FAQ
1.How can I place an order for SMB8J20CHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20CHE3/52 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 SMB8J20CHE3/52 reliable?
The price and inventory of SMB8J20CHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J20CHE3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J20CHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20CHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20CHE3/52?
SMB8J20CHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20CHE3/52 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 SMB8J20CHE3/52?
For technical support, including SMB8J20CHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20CHE3/52 requirements.
6.How does Aetrix verify that SMB8J20CHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J20CHE3/52 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 SMB8J20CHE3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J20CHE3/52?
All SMB8J20CHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20CHE3/52, 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 SMB8J20CHE3/52 part is unused and in its original packaging.
Return procedure for SMB8J20CHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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