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Vishay General Semiconductor - Diodes Division SMBJ20-E3/5B
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- Part No.:
- SMBJ20-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20-E3/5B.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,067
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Product details
Overview
SMBJ20-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 32.4 V maximum clamping voltage (VC) at 18.5 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMBJ20-E3/5B datasheet, SMBJ20-E3/5B pinout, SMBJ20-E3/5B application, or SMBJ20-E3/5B equivalent, this page delivers verified electrical specs, thermal behavior, clamping performance under surge conditions, RoHS-compliant commercial-grade construction, and direct replacement guidance for circuit protection design in industrial power supplies, automotive ECUs, and sensor interface lines.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-banded polarity, leveraging a glass-passivated silicon junction for stable avalanche response. Its low incremental surge resistance and sub-nanosecond response time ensure effective suppression of fast-rising transients up to 18.5 A (10/1000 µs).
Thermally, it exhibits RθJA = 100 °C/W and RθJL = 20 °C/W, enabling reliable operation at TJ up to +150 °C. The device is rated for 5.0 W steady-state power dissipation on infinite heatsink at 50 °C ambient and supports repetitive surge duty cycle ≤ 0.01 %.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line bias margin. |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - Confirmed breakdown range ensures predictable turn-on threshold across production lots. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamping voltage under full 600 W surge; determines protected IC's maximum transient stress level. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; validates robustness against IEC 61000-4-5 Level 4 surges. |
| IPPM | 18.5 A - Peak pulse current capability; sets minimum PCB trace width and layout clearance requirements. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, cathode-indicated by molded band. Matte tin-plated leads, J-STD-002 solderable, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or common return path; forms clamping loop with cathode during transient events. |
| Cathode | High-side surge input terminal | Banded end; connects to protected line (e.g., 24 V rail or sensor output); conducts avalanche current to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validated surge immunity for IEC 61000-4-5 4 kV/2 Ω test compliance in industrial control inputs. |
| 32.4 V clamping at 18.5 A | Limits downstream IC voltage stress below 33 V, protecting 24 V logic interfaces and microcontroller I/O pins. |
| Glass passivated junction | Ensures long-term parameter stability and low leakage (< 1.0 µA at VWM) across temperature and humidity cycles. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets EU RoHS Directive 2011/65/EU without exemptions; suitable for consumer, telecom, and non-automotive industrial use. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without dry-pack or baking; reduces manufacturing overhead and handling risk. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) Inputs |
|---|---|
|
Use Scenario: 24 V DC power rail in programmable logic controllers exposed to relay coil flyback and load dump. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between input rail and chassis ground to shunt transients before reaching DC-DC converter input stage. Use Value: Limits rail voltage to ≤32.4 V during 18.5 A surges, preventing overvoltage shutdown or MOSFET gate oxide damage in upstream regulators. |
Use Scenario: LIN bus signal line in door module subjected to ESD and battery disconnect transients. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between LIN data line and ground to clamp fast transients while preserving signal integrity. Use Value: Sub-ns response ensures clamping occurs before LIN transceiver input stages experience latch-up; VC < 33 V protects 3.3 V tolerant PHY receivers. |
| Consumer Appliance Motor Drive Feedback | Telecom Remote Sensor Interface |
|
Use Scenario: Hall-effect position feedback line from BLDC motor in HVAC system experiencing commutation noise and EFT bursts. IC Role / Device Role / Timing Role: Point-of-load TVS mounted directly at motor controller IC input pins to absorb coupled spikes before analog front-end amplifiers. Use Value: 20 V VWM allows clean 12 V analog signal passage; 32.4 V VC prevents ADC saturation and maintains closed-loop accuracy during surge events. |
Use Scenario: RS-485 data line connecting base station to outdoor environmental sensors exposed to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Primary-level TVS on differential pair, referenced to local ground, to divert common-mode surges before transceiver inputs. Use Value: 600 W rating sustains multiple 4 kV surges per IEC 61000-4-5; unidirectional configuration avoids interference with DC biasing of termination resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A-E3/52 | Same electrical specs and SMB package; differs only in tape-and-reel packaging (750 pcs vs. 3200 pcs) and reel diameter (7″ vs. 13″). | Identical circuit function and board layout; selected for lower-volume prototyping or small-batch production. | Choose SMBJ20A-E3/52 when smaller reel quantities align with assembly line changeover frequency or inventory turnover targets. |
| SMCJ20A-E3/57T | Higher power rating (1500 W), larger SMC (DO-214AB) package, same VWM/VBR/VC; RθJA = 35 °C/W vs. 100 °C/W. | Used where higher single-event energy absorption is required (e.g., primary AC input stages), but requires larger PCB area and different pad layout. | Choose SMCJ20A-E3/57T only if surge threat level exceeds 600 W or thermal constraints demand lower junction-to-ambient resistance. |
Compared with SMBJ20-E3/5B, SMBJ20A-E3/52 offers identical protection performance in a smaller reel format ideal for NPI, while SMCJ20A-E3/57T trades compact size for 2.5× pulse power and improved thermal dissipation-requiring layout revision but enabling higher-reliability front-end protection.
Availability
SMBJ20-E3/5B is available at Aetrix Electronics and suitable for industrial power input protection, automotive BCM inputs, consumer appliance motor feedback, and telecom remote sensor interface applications requiring stable component supply, consistent parametric performance, and RoHS-compliant commercial-grade sourcing.
Supply support for SMBJ20-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, TVS devices, and optoelectronics with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series is engineered for robust transient suppression in space-constrained surface-mount designs, targeting industrial automation, automotive subsystems, and communications infrastructure where fast clamping and repeatable surge endurance are critical.
FAQ
What is the maximum clamping voltage of SMBJ20-E3/5B under surge conditions?
The SMBJ20-E3/5B has a maximum clamping voltage (VC) of 32.4 V at its rated peak pulse current of 18.5 A using the 10/1000 µs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during transient events. It is confirmed in Vishay's datasheet Document Number 88392, Revision 09-Jan-2024, Table on page 2.
Is SMBJ20-E3/5B suitable for automotive applications?
SMBJ20-E3/5B is RoHS-compliant and qualified to commercial temperature range (–55 °C to +150 °C), but it is not AEC-Q101 qualified. For automotive applications requiring qualification, Vishay offers the SMBJ20HE3 variant (with HE3 suffix). The SMBJ20-E3/5B may be used in non-safety-critical automotive subsystems such as infotainment or body electronics where customer validation confirms suitability-but not in safety-related modules without additional testing.
What does the "-E3/5B" suffix indicate in SMBJ20-E3/5B?
The "-E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads. The "/5B" specifies packaging: 3200 units per 13-inch plastic tape-and-reel, per Vishay's ordering information table (page 3 of Document 88392). This differs from /52 (750 units, 7-inch reel) and affects reel logistics, SMT feeder compatibility, and inventory planning for SMBJ20-E3/5B.
How does SMBJ20-E3/5B compare to bidirectional TVS diodes like SMBJ20CA?
SMBJ20-E3/5B is unidirectional and intended for DC-biased lines where polarity is fixed (e.g., 24 V supply rails), offering lower leakage and tighter VBR tolerance. SMBJ20CA is bidirectional and suited for AC or floating signals (e.g., data lines), with symmetrical clamping in both directions. They are not interchangeable without verifying circuit topology and biasing-using SMBJ20-E3/5B in place of SMBJ20CA on an AC line would cause forward conduction and failure.
What is the thermal resistance of SMBJ20-E3/5B, and how does it affect layout?
SMBJ20-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pads per terminal. This value guides PCB copper area allocation: reducing thermal resistance requires larger pads or internal ground planes. Exceeding 150 °C junction temperature risks parametric shift or failure, so layout must ensure adequate copper thermal mass-especially under repetitive surge conditions.
SMBJ20-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 16.8A
- Power - Peak Pulse:
- 600W
- 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 (SMBJ)
SMBJ20-E3/5B FAQ
1.How can I place an order for SMBJ20-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20-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 SMBJ20-E3/5B reliable?
The price and inventory of SMBJ20-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 SMBJ20-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ20-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20-E3/5B?
SMBJ20-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20-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 SMBJ20-E3/5B?
For technical support, including SMBJ20-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20-E3/5B requirements.
6.How does Aetrix verify that SMBJ20-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ20-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 SMBJ20-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ20-E3/5B?
All SMBJ20-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20-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 SMBJ20-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ20-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20-E3/5B Tags
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