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Vishay General Semiconductor - Diodes Division SMBJ20A/54
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- Part No.:
- SMBJ20A/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20A/54.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,001
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Product details
Overview
SMBJ20A/54 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 SMBJ20A/54 datasheet, SMBJ20A/54 pinout, SMBJ20A/54 application, or SMBJ20A/54 equivalent, key selection criteria include clamping performance under 18.5 A surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity with cathode band marking, and compliance with AEC-Q101 when ordered with HE3/HM3 suffixes.
Technical Context
This TVS diode operates as a voltage-clamping protection device placed in parallel with circuit nodes requiring overvoltage immunity-typically across power rails or signal lines upstream of ICs, MOSFETs, or sensors. Its glass-passivated junction enables fast response time (<1 ns), low incremental surge resistance, and stable clamping behavior under repetitive 0.01% duty-cycle pulses.
The SMBJ20A/54 is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and delivers 5.0 W steady-state power dissipation on infinite heatsink at 50 °C ambient. Its 1.0 µA max reverse leakage at VWM ensures minimal standby power impact in low-current systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamping voltage limits downstream component stress during 10/1000 µs surge; critical for IC-level protection. |
| PPPM | 600 W - Peak pulse power handling capability with standardized 10/1000 µs waveform; validates robustness against common surge threats. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance determines required PCB copper area (0.2" × 0.2") for thermal management under sustained surges. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports protection of DC power inputs against high-energy faults. |
| TJ max | +150 °C - Maximum junction temperature enables operation in automotive engine compartments and industrial enclosures. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by molded band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected node connection point | Connected to line being protected (e.g., VIN, signal trace); conducts surge current to ground when voltage exceeds VBR. |
| Anode (unbanded end) | Reference/return path | Typically tied to system ground or low-impedance return plane; completes clamping path during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validated surge energy absorption capacity for IEC 61000-4-5 Level 3/4 compliance in industrial and telecom interfaces. |
| 32.4 V clamping at 18.5 A | Ensures downstream 24 V logic or microcontroller I/O pins remain below absolute maximum ratings during worst-case transients. |
| 1.0 µA max reverse leakage @ 20 V | Minimizes quiescent current draw in battery-powered sensor nodes and always-on circuits without compromising protection margin. |
| MSL Level 1, 260 °C peak reflow | Enables compatibility with standard lead-free SMT assembly processes without moisture sensitivity concerns or baking requirements. |
| AEC-Q101 qualification option | Available with HE3/HM3 suffixes for automotive applications requiring validated reliability under temperature cycling and humidity testing. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and MCU I/O lines against back-EMF spikes from relay and solenoid switching in PLCs and motor controllers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V supply rail and ground, clamping transients before they reach isolated gate drivers or CAN transceivers. Use Value: Limits voltage excursion to ≤32.4 V during 18.5 A surges, preventing latch-up or oxide damage in 3.3 V/5 V logic interfaces downstream. |
Use Scenario: Surge suppression on LIN bus lines and power inputs of door module ECUs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 20 V) installed at connector entry point to absorb ISO 7637-2 Pulse 1/2a/5a energy before reaching LIN transceiver and microcontroller. Use Value: Maintains signal integrity under 100 V/50 ms load dump by clamping within specification while drawing <1 µA at nominal 12 V battery voltage. |
| Telecom Power Feeds | Consumer Sensor Hubs |
|
Use Scenario: Input-stage protection on PoE-powered Ethernet switches and base station RF front-end supplies subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary TVS on 48 V DC input rail, coordinated with upstream fuses and secondary filtering to meet IEC 61000-4-5 4 kV line-earth test requirements. Use Value: Delivers 600 W pulse power handling with 32.4 V clamping to prevent overvoltage failure of DC-DC converters and PMICs feeding FPGAs or DSPs. |
Use Scenario: ESD and cable discharge protection on USB-C, I²C, and analog sensor inputs in smart home hubs and wearable charging docks. IC Role / Device Role / Timing Role: Low-leakage (1 µA) unidirectional TVS placed directly at connector pins to shunt sub-100 ns ESD events before reaching precision ADCs or touch controllers. Use Value: Enables >8 kV contact / 15 kV air ESD immunity per IEC 61000-4-2 without degrading baseline accuracy of 16-bit sensor measurements. |
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 | Bidirectional variant; symmetric VBR (22.2–24.5 V) in both polarities; no polarity marking. | Required for AC-coupled lines (e.g., RS-485, audio), where reverse polarity surges occur; not suitable for DC rail protection with defined ground reference. | Select SMBJ20CA only when protecting balanced differential signals or floating nodes needing bidirectional clamping. |
| SMAJ20A | Same VWM/VBR/VC specs but lower PPPM (400 W); SMA (DO-214AC) package with smaller footprint and higher RθJA (140 °C/W). | Acceptable for lower-energy transients (e.g., IEC 61000-4-2 ESD only); insufficient for IEC 61000-4-5 line surge in industrial settings. | Choose SMAJ20A only for space-constrained consumer designs with verified <400 W surge exposure and adequate thermal relief. |
Compared with SMBJ20A/54, SMBJ20CA provides symmetrical clamping essential for AC signal paths but lacks unidirectional optimization for DC rail protection, while SMAJ20A sacrifices 33% pulse power headroom and thermal performance-making SMBJ20A/54 the preferred choice for robust 600 W industrial and automotive surge immunity.
Availability
SMBJ20A/54 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant variants.
Supply support for SMBJ20A/54 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, power efficiency, and automotive-grade qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments-targeting industrial automation, automotive electronics, and infrastructure equipment where robustness against lightning, ESD, and inductive switching is mission-critical.
FAQ
What is the clamping voltage of SMBJ20A/54 and how is it measured?
The SMBJ20A/54 has a maximum clamping voltage (VC) of 32.4 V, measured at its peak pulse current (IPPM) of 18.5 A using a standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed per Vishay's datasheet (Document Number: 88392, Rev. 09-Jan-2024) and reflects the actual voltage seen by downstream components during worst-case transient events. The SMBJ20A/54 maintains this clamping performance across its full operating temperature range.
Is SMBJ20A/54 RoHS-compliant and halogen-free?
Yes-SMBJ20A/54 is offered in multiple environmental variants: the "E3" suffix denotes RoHS-compliant commercial grade, while "M3" indicates halogen-free and RoHS-compliant construction. Both meet UL 94 V-0 flammability standards and JESD 201 Class 2 whisker resistance. The base part number SMBJ20A/54 itself refers to the commercial-grade configuration unless specified otherwise with HE3 or HM3 suffixes for automotive use.
Does SMBJ20A/54 support automotive applications?
SMBJ20A/54 qualifies for automotive use when ordered with the HE3 (RoHS-compliant, AEC-Q101 qualified) or HM3 (halogen-free, RoHS-compliant, AEC-Q101 qualified) suffixes. These versions undergo extended reliability testing including temperature cycling, humidity bias, and mechanical shock per AEC-Q101. The standard SMBJ20A/54 without HE3/HM3 is commercial-grade and not certified for automotive deployment.
How does SMBJ20A/54 differ from SMBJ20CA?
SMBJ20A/54 is unidirectional with cathode band marking and optimized for DC rail protection, whereas SMBJ20CA is bidirectional with identical VBR in both directions and no polarity marking-making it suitable for AC or differential signal lines like RS-485 or CAN. Their clamping and surge ratings are identical, but SMBJ20A/54 cannot replace SMBJ20CA in bidirectional applications without risking reverse conduction failure.
What is the thermal resistance and recommended pad layout for SMBJ20A/54?
The SMBJ20A/54 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's datasheet. This pad layout is mandatory to achieve rated 600 W pulse power and avoid thermal runaway during repetitive surges. Smaller pads increase RθJA, reducing effective surge capability and derating performance above 25 °C ambient.
SMBJ20A/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Cut Tape (CT)
- 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/54 FAQ
1.How can I place an order for SMBJ20A/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20A/54 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/54 reliable?
The price and inventory of SMBJ20A/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20A/54 is usually 5 days.
3.What payment methods are accepted for SMBJ20A/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20A/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20A/54?
SMBJ20A/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20A/54 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/54?
For technical support, including SMBJ20A/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20A/54 requirements.
6.How does Aetrix verify that SMBJ20A/54 is sourced from the original manufacturer or authorized distributors?
All SMBJ20A/54 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/54 meets industry standards.
7.What is the process for return or replacement of SMBJ20A/54?
All SMBJ20A/54 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20A/54, 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/54 part is unused and in its original packaging.
Return procedure for SMBJ20A/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20A/54 Tags
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