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Vishay General Semiconductor - Diodes Division SMBJ20A-E3/52
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- Part No.:
- SMBJ20A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20A-E3/52.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,526
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Product details
Overview
SMBJ20A-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the 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 a 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial and telecom equipment.
For engineers reviewing the SMBJ20A-E3/52 datasheet, SMBJ20A-E3/52 pinout, SMBJ20A-E3/52 application, or SMBJ20A-E3/52 equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, RoHS-compliant packaging details, and validated alternative parts for ESD and lightning-induced transient protection design.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device across DC power rails or low-speed signal paths, activating when reverse voltage exceeds its VBR threshold to shunt surge energy to ground. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ns), while the SMB package supports automated placement and meets MSL level 1 reflow requirements (260 °C peak).
Thermal performance is defined by RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), enabling reliable operation up to TJ = +150 °C. The device is rated for 100 A non-repetitive forward surge (8.3 ms half-sine) and exhibits a VF ≤ 3.5 V at IF = 50 A - critical for minimizing conduction loss during fault events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR @ IT = 1 mA | 22.2–24.5 V - Measured breakdown range confirming tight tolerance for predictable turn-on behavior under transient stress. |
| VC @ IPPM = 18.5 A | 32.4 V - Clamped voltage during 600 W surge event; determines maximum stress imposed on downstream protected circuitry. |
| 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 surge current capability at VC; directly correlates to energy absorption (≈ 1.85 J per pulse). |
| TJ max. | +150 °C - Maximum junction temperature; enables use in high-ambient environments such as industrial motor drives and outdoor telecom nodes. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.21 mm × 4.06 mm footprint and 2.20 mm height; compatible with standard SMT reflow profiles. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, polarity indicated by cathode band on one end. Complies with UL 94 V-0 flammability rating and J-STD-002/JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to system ground or low-side reference; completes clamping loop during transient events. |
| Cathode | Reverse-biased terminal / Protected line connection | Connected to line being protected (e.g., 24 V rail or sensor output); reverse voltage triggers avalanche conduction. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity testing up to Level 4 (4 kV line-to-ground) without external series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on protected ICs - e.g., keeps microcontroller I/O pins below absolute maximum ratings during transients. |
| 1.0 µA max reverse leakage at VWM | Prevents excessive standby power loss in battery-powered sensor nodes and ensures signal integrity on high-impedance analog lines. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and compatibility with standard lead-free reflow profiles (peak 260 °C), reducing manufacturing risk. |
| AEC-Q101 qualified variants available | Supports automotive-grade designs (e.g., body control modules) when ordered with HE3/HM3 suffixes - not applicable to SMBJ20A-E3/52 itself. |
Applications
| Industrial Motor Drive Power Supply | Automotive Body Control Module (BCM) Input Protection |
|---|---|
Use Scenario: Suppresses switching spikes from relay coils and H-bridge flyback energy in 24 V DC motor control boards. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V input rail and chassis ground to clamp inductive kickback. Use Value: Limits voltage overshoot to ≤32.4 V, preventing damage to upstream DC/DC converters and MCU power supervisors. |
Use Scenario: Protects LIN bus transceiver inputs and microcontroller GPIOs from load dump and jump-start transients in BCM units. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply line feeding LIN transceivers, activated only during >22.2 V surges. Use Value: Maintains <1 µA leakage at 12 V nominal, avoiding false wake-up currents while clamping 100 V/100 ms load dump peaks. |
| Telecom Remote Radio Unit (RRU) DC Feeder Line | Consumer Smart Home Sensor Hub Power Input |
Use Scenario: Guards 48 V PoE-derived DC feed lines in outdoor RRUs against lightning-induced surges entering via copper cabling. IC Role / Device Role / Timing Role: Primary clamping device on main DC input, coordinated with upstream GDT and downstream π-filter. Use Value: Absorbs 600 W surge energy within 1000 µs window, limiting residual voltage to 32.4 V at 18.5 A to preserve RF front-end LNA biasing. |
Use Scenario: Shields USB-C PD and Zigbee radio power domains in smart home hubs from ESD and AC adapter switching noise. IC Role / Device Role / Timing Role: Low-leakage TVS on 5 V/3.3 V regulator outputs to prevent latch-up in wireless SoCs during human-body-model (HBM) ESD events. Use Value: Responds in <1 ns to 8 kV HBM strikes, clamping to 32.4 V before internal protection diodes activate - extending SoC lifetime. |
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 | Bidirectional variant with same VWM (20 V), symmetric VBR (22.2–24.5 V), and identical PPPM (600 W); no polarity marking. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus); unsuitable for DC rail protection where unidirectional blocking is needed. | Select SMBJ20CA-E3/52 only when protecting balanced differential pairs or AC signals; SMBJ20A-E3/52 remains optimal for single-rail DC protection. |
| SMAJ20A-E3/61 | Lower PPPM (400 W), larger VC (34.0 V at 12.3 A), SMA (DO-214AC) package with smaller 4.57 mm × 2.69 mm footprint and higher RθJA (140 °C/W). | Used where board space is constrained but surge energy is lower (e.g., consumer USB ports); insufficient for 600 W industrial surges. | Choose SMAJ20A-E3/61 only for cost-sensitive, low-energy applications with strict area limits; SMBJ20A-E3/52 provides superior energy handling and thermal margin. |
Compared with SMBJ20CA-E3/52 and SMAJ20A-E3/61, SMBJ20A-E3/52 delivers the highest surge energy capacity in its footprint class, optimized specifically for unidirectional DC rail protection where precise VWM margin and low clamping voltage are critical - making it the preferred choice for industrial and telecom power input stages.
Availability
SMBJ20A-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom remote radio units, and automotive body control modules requiring stable component supply, consistent RoHS-compliant sourcing, and full traceability through Vishay's authorized distribution channel.
Supply support for SMBJ20A-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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was developed for high-energy transient suppression in harsh environments - targeting industrial automation, telecommunications infrastructure, and automotive subsystems where robustness against lightning, ESD, and inductive switching is mandatory.
FAQ
What is the maximum clamping voltage of SMBJ20A-E3/52 at its rated peak pulse current?
The SMBJ20A-E3/52 has a maximum clamping voltage (VC) of 32.4 V at its rated peak pulse current (IPPM) of 18.5 A, measured using the standardized 10/1000 µs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during a 600 W transient event and is confirmed in the Vishay datasheet revision 09-Jan-2024, page 2.
Is SMBJ20A-E3/52 suitable for protecting 24 V DC power rails?
Yes, SMBJ20A-E3/52 is explicitly designed for 24 V DC rail protection, with a 20 V stand-off voltage (VWM) providing a 16.7% margin above nominal 24 V operation while ensuring reliable clamping onset at 22.2–24.5 V. Its 32.4 V clamping voltage prevents overvoltage damage to downstream regulators and controllers in industrial PLCs and motor drives.
Does SMBJ20A-E3/52 meet automotive qualification standards?
No, SMBJ20A-E3/52 is a commercial-grade part with RoHS compliance (E3 suffix) but is not AEC-Q101 qualified. For automotive applications, Vishay offers the SMBJ20AHE3 variant (HE3 suffix), which undergoes extended stress testing per AEC-Q101. Engineers must select the HE3 or HM3 version if automotive qualification is required.
What is the thermal resistance from junction to ambient for SMBJ20A-E3/52?
The typical junction-to-ambient thermal resistance (RθJA) of SMBJ20A-E3/52 is 100 °C/W when mounted on the minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes natural convection cooling and is critical for calculating safe power dissipation limits at elevated ambient temperatures.
How does SMBJ20A-E3/52 differ from SMBJ20CA-E3/52?
SMBJ20A-E3/52 is unidirectional with cathode marking and blocks forward current, while SMBJ20CA-E3/52 is bidirectional with symmetrical breakdown in both polarities and no polarity marking. Both share identical VWM, VBR, and PPPM, but SMBJ20A-E3/52 is used on DC rails and SMBJ20CA-E3/52 on AC or differential signal lines like RS-485.
SMBJ20A-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 18.5A
- 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)
SMBJ20A-E3/52 FAQ
1.How can I place an order for SMBJ20A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20A-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 SMBJ20A-E3/52 reliable?
The price and inventory of SMBJ20A-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 SMBJ20A-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ20A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20A-E3/52?
SMBJ20A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20A-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 SMBJ20A-E3/52?
For technical support, including SMBJ20A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20A-E3/52 requirements.
6.How does Aetrix verify that SMBJ20A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ20A-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 SMBJ20A-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ20A-E3/52?
All SMBJ20A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20A-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 SMBJ20A-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ20A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20A-E3/52 Tags
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