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Vishay General Semiconductor - Diodes Division SMBJ20C-E3/5B
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- Part No.:
- SMBJ20C-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20C-E3/5B.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,895
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Product details
Overview
SMBJ20C-E3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. 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 - deployed on power rails and signal lines in industrial motor drives.
For engineers reviewing the SMBJ20C-E3/5B datasheet, SMBJ20C-E3/5B pinout, SMBJ20C-E3/5B application, or SMBJ20C-E3/5B equivalent, this page delivers verified electrical specs, thermal derating behavior, clamping performance under surge conditions, and direct replacement guidance for ESD/lightning transient suppression in 24 V DC systems.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging an avalanche breakdown mechanism to limit transient voltages before they damage downstream ICs or MOSFETs. Its low incremental surge resistance and fast response time (<1 ns) ensure effective suppression of inductive switching spikes and ESD events.
Thermal design is constrained by RθJA = 100 °C/W (typ.) and TJ(max) = 150 °C, requiring PCB copper pad area per Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) layout for rated 600 W pulse handling. Derating above 25 °C ambient follows Fig. 2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; sets upper limit for normal circuit operation. |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - Confirmed breakdown range ensures reliable triggering without premature conduction. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamped voltage during full 600 W surge; defines worst-case stress on protected load. |
| PPPM | 600 W - Peak pulse power capability with 10/1000 µs waveform; validates suitability for IEC 61000-4-5 Level 3 surges. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports protection against high-energy inductive kickback. |
| TJ(max) | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or industrial enclosures with limited airflow. |
| Package | SMB (DO-214AA) - Surface-mount outline with cathode band marking; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, RoHS-compliant (E3 suffix), MSL Level 1 (JEDEC J-STD-020), LF peak 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point in unidirectional configuration | Connected to protected line (e.g., 24 V rail); clamps positive transients to ground when voltage exceeds VBR. |
| Anode | Ground reference terminal | Must be tied to system ground plane with low-inductance path; determines clamping reference and affects VC accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates compliance with IEC 61000-4-5 surge immunity requirements for industrial control inputs. |
| Clamping voltage ≤ 32.4 V at 18.5 A | Ensures protected 24 V logic or gate drivers remain below absolute maximum ratings during transients. |
| Low incremental surge resistance | Minimizes VC overshoot and improves energy absorption consistency across multiple surge events. |
| Glass passivated chip junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity exposure. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets environmental compliance for global OEM production without halogen restrictions or AEC-Q101 overhead. |
Applications
| Industrial Motor Drives | PLC Digital I/O Modules |
|---|---|
|
Use Scenario: Protection of 24 V DC input terminals against inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Unidirectional TVS placed between field input and controller-side buffer IC to clamp positive-going transients. Use Value: Limits voltage seen by input protection diodes and level-shifters to ≤32.4 V, preventing latch-up or permanent damage during 100 A coil de-energization. |
Use Scenario: Surge suppression on 24 V sensor supply lines feeding analog front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Standoff-rated TVS connected from sensor VCC to ground to absorb coupled lightning-induced surges on long cable runs. Use Value: Maintains regulated 24 V output integrity by clamping transients before they propagate into LDOs or ADC reference circuits. |
| Automotive Body Control Modules | Industrial Ethernet PHY Interfaces |
|
Use Scenario: Input protection for LIN bus transceivers powered from switched 12 V/24 V battery rails subject to load dump. IC Role / Device Role / Timing Role: Primary overvoltage clamp on transceiver VCC pin, coordinated with upstream fuse and secondary RC filtering. Use Value: Survives ISO 7637-2 Pulse 5a (load dump) up to 35 V with <100 ns response, preserving transceiver functionality without reset. |
Use Scenario: Secondary-level transient suppression on 3.3 V or 5 V PHY power rails adjacent to RJ45 magnetics. IC Role / Device Role / Timing Role: Localized clamping device placed immediately after DC-DC converter output to protect PHY silicon from board-level ESD coupling. Use Value: Reduces risk of PHY latch-up during hot-plug events by limiting rail excursion to <35 V during ±8 kV contact discharge. |
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-E3/5B | Same VWM, VBR, VC, and package; identical electrical specs per Vishay datasheet Table 1. | No functional difference; SMBJ20A-E3/5B is the standard unidirectional marking for this variant. | Select SMBJ20A-E3/5B when standard part numbering is required for procurement or legacy BOM alignment. |
| SMAJ20A-E3/52 | Lower PPPM (400 W vs. 600 W), smaller SMA (DO-214AC) package, higher RθJA (~150 °C/W). | Not suitable for high-energy surges; limited to lower-power signal lines or space-constrained layouts where 600 W margin is unnecessary. | Choose SMAJ20A-E3/52 only if board area is critical and surge threat level is restricted to IEC 61000-4-2 ESD only. |
Compared with SMBJ20A-E3/5B, the SMBJ20C-E3/5B shares identical electrical performance but reflects Vishay's updated internal revision coding; versus SMAJ20A-E3/52, it delivers 50 % higher surge power handling and superior thermal dissipation due to larger SMB footprint and lower thermal resistance.
Availability
SMBJ20C-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, PLC digital I/O modules, automotive body control units, and industrial Ethernet PHY interfaces requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for SMBJ20C-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 and application-specific performance.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and telecom infrastructure where robustness against inductive switching and lightning surges is mandatory.
FAQ
What is the clamping voltage of SMBJ20C-E3/5B at its rated peak pulse current?
The SMBJ20C-E3/5B has a maximum clamping voltage (VC) of 32.4 V at 18.5 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during a full 600 W transient event. The SMBJ20C-E3/5B maintains this clamping performance across its specified operating temperature range.
Is SMBJ20C-E3/5B RoHS-compliant and lead-free?
Yes, SMBJ20C-E3/5B is RoHS-compliant and lead-free, indicated by the "E3" suffix per Vishay's ordering nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and undergoes matte tin plating per J-STD-002 and JESD 22-B102. The molding compound complies with UL 94 V-0 flammability rating, confirming full environmental compliance for commercial-grade production.
How does SMBJ20C-E3/5B differ from SMBJ20CA-E3/5B?
SMBJ20C-E3/5B is unidirectional, while SMBJ20CA-E3/5B is bidirectional - meaning the latter suppresses transients of either polarity and lacks cathode marking. Their VWM (20 V), VBR, and VC values differ slightly due to symmetrical breakdown design in the CA version. SMBJ20C-E3/5B must be oriented with cathode toward the protected line; SMBJ20CA-E3/5B has no polarity requirement.
What is the maximum operating temperature for SMBJ20C-E3/5B?
The SMBJ20C-E3/5B has a maximum junction temperature (TJ(max)) of +150 °C and an operating/storage temperature range of –55 °C to +150 °C. Thermal performance depends on PCB layout: using Vishay's recommended 0.2" × 0.2" copper pads achieves the rated 600 W pulse power; derating begins above 25 °C ambient per Figure 2 in the datasheet.
Can SMBJ20C-E3/5B replace SMAJ20A-E3/52 in existing designs?
SMBJ20C-E3/5B can replace SMAJ20A-E3/52 only if board layout accommodates the larger SMB (DO-214AA) footprint and thermal requirements are upgraded. While both share VWM = 20 V and similar VBR, the SMBJ20C-E3/5B offers 50 % higher peak pulse power (600 W vs. 400 W) and lower thermal resistance - making it suitable for more demanding surge environments, but requiring pad redesign and revalidation.
SMBJ20C-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ20C-E3/5B FAQ
1.How can I place an order for SMBJ20C-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20C-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 SMBJ20C-E3/5B reliable?
The price and inventory of SMBJ20C-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 SMBJ20C-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ20C-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20C-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20C-E3/5B?
SMBJ20C-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20C-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 SMBJ20C-E3/5B?
For technical support, including SMBJ20C-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20C-E3/5B requirements.
6.How does Aetrix verify that SMBJ20C-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ20C-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 SMBJ20C-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ20C-E3/5B?
All SMBJ20C-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20C-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 SMBJ20C-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ20C-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20C-E3/5B Tags
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