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Vishay General Semiconductor - Diodes Division SMBJ20-E3/52
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- Part No.:
- SMBJ20-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20-E3/52.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,524
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Product details
Overview
SMBJ20-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ20-E3/52 datasheet, SMBJ20-E3/52 pinout, SMBJ20-E3/52 application, or SMBJ20-E3/52 equivalent, key selection criteria include unidirectional polarity, 1.0 µA max reverse leakage at VWM, 150 °C max junction temperature, and RoHS-compliant matte tin-plated leads suitable for automated SMT placement per J-STD-002.
Technical Context
This TVS diode operates as a voltage-clamping protection device, conducting only when reverse voltage exceeds its breakdown threshold to divert surge energy away from downstream circuitry. Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance under repetitive 10/1000 µs transients at 0.01% duty cycle.
The SMBJ20-E3/52 is rated for 100 A non-repetitive forward surge current (IFSM) and exhibits a positive temperature coefficient of VBR (+0.094 %/°C), enabling predictable voltage shift across operating temperature range (−55 °C to +150 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working margin for protected line. |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - Confirmed breakdown range ensures reliable triggering without premature clamping. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamping voltage during 600 W transient; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; validates robustness against lightning-induced or inductive-switching surges. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| TJ max. | +150 °C - Enables operation in harsh environments including motor drives and automotive under-hood applications. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs thermal derating requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads. Cathode indicated by band marking on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VREV > VBR. |
| Anode (unbanded end) | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping current path. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validated surge immunity for IEC 61000-4-5 Level 3 (1 kV/2 kV) compliance in industrial equipment. |
| Glass passivated junction | Ensures stable, repeatable avalanche behavior over lifetime and temperature cycling without parameter drift. |
| MSL Level 1 (J-STD-020) | Enables lead-free reflow without moisture-related popcorning; supports standard SMT assembly processes up to 260 °C peak. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets EU RoHS Directive 2011/65/EU; no exemptions required; suitable for global commercial electronics manufacturing. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns rise time), improving protection margin for sensitive CMOS inputs. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O pins against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Unidirectional clamping device placed between power rail and ground, triggered within <1 ns of overvoltage event. Use Value: Limits transient voltage to ≤32.4 V, preventing latch-up or oxide breakdown in 3.3 V/5 V logic interfaces. |
Use Scenario: Shielding LIN bus transceivers and sensor signal lines from load dump and jump-start surges in 12 V vehicle systems. IC Role / Device Role / Timing Role: Standoff protector on supply input and data lines; operates outside normal signaling window due to fast response. Use Value: Withstands 100 A surge (8.3 ms half-sine) and maintains ≤1 µA leakage at 20 V, preserving bus bias stability. |
| Consumer Power Adapters | Telecom DC Power Distribution |
Use Scenario: Secondary-side overvoltage suppression on 5 V/12 V output rails of AC-DC adapters subject to ESD and line transients. IC Role / Device Role / Timing Role: Parallel-connected TVS shunting excess energy to ground during transient events on regulated outputs. Use Value: 600 W rating handles multiple repetitions of 10/1000 µs surges without degradation, supporting UL 62368-1 compliance. |
Use Scenario: Input-stage protection for PoE-powered devices (IEEE 802.3af/at) exposed to Ethernet cable-induced surges. IC Role / Device Role / Timing Role: Front-end clamp on 48 V DC input; coordinates with upstream fuses and common-mode chokes. Use Value: 20 V VWM allows compatibility with 48 V nominal systems using 2:1 voltage dividers or regulators; low capacitance avoids signal distortion. |
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 package; identical marking code "LV" per Vishay documentation; E3/52 denotes same reel packaging and RoHS status. | No functional difference; direct form-fit-function match confirmed in Vishay ordering matrix. | Select SMBJ20A-E3/52 if cross-reference validation requires explicit "A" suffix alignment with datasheet table headers. |
| SMCJ20A-E3/52 | Same VWM/VBR/VC, but in larger SMC (DO-214AB) package; 1500 W PPPM rating vs. 600 W. | Higher surge capacity suits higher-energy threat environments (e.g., outdoor telecom cabinets); requires larger PCB footprint. | Choose SMCJ20A-E3/52 only when system-level testing confirms need for >600 W clamping; otherwise SMBJ20-E3/52 offers optimal space/power balance. |
Compared with SMBJ20A-E3/52 (identical specification), SMBJ20-E3/52 is functionally interchangeable; versus SMCJ20A-E3/52, it trades surge headroom for compact SMB footprint-critical for space-constrained consumer and embedded designs where 600 W suffices.
Availability
SMBJ20-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and consumer power adapters requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ20-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, and protection devices with emphasis on reliability and application-specific performance.
The SMBJ series was developed for high-volume, automated SMT protection of power and signal lines in commercial and industrial systems-prioritizing low profile, consistent clamping, and JEDEC-compliant manufacturability.
FAQ
What is the polarity configuration of SMBJ20-E3/52?
The SMBJ20-E3/52 is a unidirectional TVS diode, with cathode identified by the band marking on the SMB package body. It conducts only in reverse bias above VBR, making it suitable for DC rail protection where polarity is fixed. Bidirectional variants use "CA" suffix (e.g., SMBJ20CA) and lack polarity marking.
Does SMBJ20-E3/52 meet automotive qualification standards?
No - SMBJ20-E3/52 carries the commercial-grade E3 suffix and is not AEC-Q101 qualified. For automotive applications, specify SMBJ20HE3 (AEC-Q101 qualified, RoHS-compliant) instead; the HE3 variant includes extended temperature screening and enhanced reliability testing per automotive requirements.
What is the maximum clamping voltage of SMBJ20-E3/52 under surge conditions?
The SMBJ20-E3/52 has a maximum clamping voltage (VC) of 32.4 V at 18.5 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is guaranteed per Vishay datasheet 88392 and defines the upper voltage limit imposed on protected circuitry during transient events.
Can SMBJ20-E3/52 be used in bidirectional signal line protection?
No - SMBJ20-E3/52 is unidirectional and unsuitable for AC or bidirectional signal paths. For such applications, use the bidirectional SMBJ20CA-E3/52, which provides symmetrical clamping in both directions and omits polarity marking. Using SMBJ20-E3/52 on AC lines risks forward conduction and failure.
What is the thermal resistance and recommended pad layout for SMBJ20-E3/52?
The SMBJ20-E3/52 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, as specified in Vishay datasheet 88392. Larger copper areas reduce RθJA and improve surge endurance; minimum pad dimensions must follow DO-214AA outline drawing.
SMBJ20-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:
- 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-E3/52 FAQ
1.How can I place an order for SMBJ20-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20-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 SMBJ20-E3/52 reliable?
The price and inventory of SMBJ20-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 SMBJ20-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ20-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20-E3/52?
SMBJ20-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20-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 SMBJ20-E3/52?
For technical support, including SMBJ20-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20-E3/52 requirements.
6.How does Aetrix verify that SMBJ20-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ20-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 SMBJ20-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ20-E3/52?
All SMBJ20-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20-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 SMBJ20-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ20-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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