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Vishay General Semiconductor - Diodes Division SMBJ20A-E3/5B
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- Part No.:
- SMBJ20A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20A-E3/5B.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,090
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Product details
Overview
SMBJ20A-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails 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 - deployed in industrial motor drives, automotive body control modules, and industrial sensor interfaces.
For engineers reviewing the SMBJ20A-E3/5B datasheet, SMBJ20A-E3/5B pinout, SMBJ20A-E3/5B application, or SMBJ20A-E3/5B equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, and RoHS-compliant commercial-grade sourcing details - all specific to the E3/5B tape-and-reel variant with matte tin-plated leads and J-STD-002 solderability.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 20 V, it transitions from high-impedance blocking to low-impedance conduction within <1 ps, diverting transient energy away from downstream ICs. Its glass-passivated junction ensures stable leakage (<1 µA at VWM) and repeatable breakdown characteristics across temperature.
Thermal design relies on its RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), enabling effective heat dissipation via PCB copper pads (0.2" × 0.2") - critical for sustaining repetitive 0.01% duty-cycle surges without thermal runaway. The device meets MSL Level 1 per J-STD-020 and supports peak forward surge current IFSM = 100 A (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 24 V systems. |
| VBR (Breakdown Voltage) | 22.2–24.5 V at IT = 1 mA - precise threshold where avalanche conduction initiates; tight 10% tolerance enables predictable protection onset. |
| VC (Clamping Voltage) | 32.4 V at IPPM = 18.5 A - maximum voltage seen by protected circuit during 10/1000 µs surge; limits stress on 3.3 V/5 V logic inputs. |
| PPPM (Peak Pulse Power) | 600 W - surge energy handling capacity with 10/1000 µs waveform; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) transients. |
| IPPM (Peak Pulse Current) | 18.5 A - maximum non-repetitive surge current supported; derived from VC and PPPM, confirms clamping integrity under worst-case surge. |
| TJmax | 150 °C - maximum junction temperature; allows operation in under-hood automotive or enclosed industrial enclosures. |
| Leakage (ID) | <1 µA at VWM - negligible standby power loss and no false triggering in low-power sensor circuits. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with cathode band marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to system ground or low-side reference; completes shunt path during transient events. |
| Cathode | Protected line connection / Surge input | Connected to line being protected (e.g., 24 V supply rail); polarity band identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 surges up to 1 kV in 2 Ω source impedance without cascading devices. |
| 32.4 V clamping at 18.5 A | Ensures downstream 3.3 V microcontrollers and CAN transceivers remain below absolute maximum ratings during surge events. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without moisture sensitivity concerns or pre-bake requirements. |
| RoHS-compliant, halogen-free option available | E3 suffix confirms compliance with EU RoHS Directive 2011/65/EU and IPC-1752A material declarations. |
| 100 A IFSM (8.3 ms half-sine) | Withstands inrush currents from capacitive loads or relay coil de-energization without degradation. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 24 V DC power input to motor driver ICs against inductive kickback from brushed DC motors and solenoids. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VCC and GND, clamping transients within nanoseconds to prevent latch-up or gate oxide damage. Use Value: Limits voltage excursion to ≤32.4 V during 100 A inductive spikes, preserving functional safety integrity of ISO 26262-compliant drive stages. |
Use Scenario: Guarding LIN bus transceiver power pins against load dump and jump-start transients in door module ECUs. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail, activated only during >20 V overvoltage events to avoid interference with normal LIN signaling. Use Value: Maintains <1 µA leakage at 12 V nominal, eliminating standby current penalty while delivering 600 W surge immunity per pulse. |
| Industrial Sensor Interfaces | Telecom Power Feeds |
|
Use Scenario: Safeguarding analog front-end inputs of 4–20 mA current loop sensors exposed to field wiring ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp on sensor supply line, coordinated with series ferrite and filtering to preserve signal fidelity. Use Value: Clamps 1 kV EFT bursts to ≤32.4 V within <1 ps, preventing ADC saturation and maintaining ±0.1% measurement accuracy. |
Use Scenario: Secondary-side overvoltage suppression on -48 V telecom rectifier outputs feeding base station RF amplifiers. IC Role / Device Role / Timing Role: High-energy TVS on DC output rail, selected for 20 V standoff to accommodate -48 V nominal with 20% regulation tolerance. Use Value: Handles repetitive 600 W surges with 0.01% duty cycle, ensuring long-term reliability in continuously powered central office equipment. |
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-E3/5B | Bidirectional version; symmetric VBR = 22.2–24.5 V in both polarities; higher reverse leakage (≤5 µA vs. ≤1 µA). | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, USB D+/D−); unsuitable for DC rail protection where polarity matters. | Select SMBJ20CA-E3/5B only when protecting bidirectional data lines or floating references; otherwise, unidirectional SMBJ20A-E3/5B offers lower leakage and tighter clamping. |
| SMAJ20A-E3/52 | Same VWM/VBR/VC specs but in smaller SMA (DO-214AC) package; lower PPPM = 400 W; RθJA = 140 °C/W. | Limited to lower-energy transients (IEC 61000-4-5 Level 2); not recommended for high-current motor drive or automotive load dump. | Choose SMAJ20A-E3/52 only for space-constrained consumer electronics with ≤400 W surge requirements; SMBJ20A-E3/5B provides 50% higher power headroom and better thermal performance. |
Compared with SMBJ20CA-E3/5B and SMAJ20A-E3/52, the SMBJ20A-E3/5B delivers optimal balance of 600 W surge capacity, 32.4 V clamping, and commercial-grade RoHS compliance - making it the preferred choice for 24 V industrial power rail protection where unidirectional clamping and thermal robustness are critical.
Availability
SMBJ20A-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ20A-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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and infrastructure equipment where consistent clamping performance and AEC-Q101 qualification options are essential.
FAQ
What is the maximum clamping voltage of SMBJ20A-E3/5B at its rated peak pulse current?
The SMBJ20A-E3/5B has a maximum clamping voltage (VC) of 32.4 V at its rated peak pulse current (IPPM) of 18.5 A, measured under the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and ensures protected circuits remain within safe voltage limits during transient events. The SMBJ20A-E3/5B achieves this clamping performance while maintaining low incremental surge resistance for minimal voltage overshoot.
Is SMBJ20A-E3/5B suitable for automotive applications?
SMBJ20A-E3/5B is a commercial-grade RoHS-compliant part (E3 suffix) and is not AEC-Q101 qualified. For automotive use, Vishay offers the SMBJ20AHE3_B variant (HE3 suffix), which is AEC-Q101 qualified and tested per stress test conditions for automotive electronics. The SMBJ20A-E3/5B itself is appropriate for non-safety-critical industrial or telecom applications but should not be used in ASIL-B or higher automotive systems without qualification validation. Always verify the exact suffix and qualification status for each SMBJ20A-E3/5B order.
What does the "/5B" suffix indicate in SMBJ20A-E3/5B?
"/5B" denotes the packaging configuration: 13-inch diameter plastic tape-and-reel with a base quantity of 3200 units per reel. This differs from "/52", which specifies a 7-inch reel with 750 units. Both share identical electrical and thermal specifications; the /5B format is optimized for high-volume SMT production lines requiring extended reel life and reduced changeover frequency. The SMBJ20A-E3/5B maintains full compatibility with standard SMB pick-and-place feeders and reflow profiles.
How does SMBJ20A-E3/5B compare to SMAJ20A in terms of thermal performance?
SMBJ20A-E3/5B exhibits superior thermal performance versus SMAJ20A due to its larger SMB (DO-214AA) package: typical junction-to-ambient thermal resistance (RθJA) is 100 °C/W versus 140 °C/W for SMAJ20A, and junction-to-lead resistance (RθJL) is 20 °C/W versus 25 °C/W. This enables SMBJ20A-E3/5B to sustain repetitive 600 W surges with greater margin and lower junction temperature rise - critical in enclosed industrial enclosures. The SMBJ20A-E3/5B also supports higher peak forward surge current (100 A vs. 40 A).
Can SMBJ20A-E3/5B be used in bidirectional signal protection?
No - SMBJ20A-E3/5B is a unidirectional TVS diode, with polarity marked by a cathode band; it conducts only in reverse bias above VWM. For bidirectional signal lines (e.g., RS-485, CAN, USB), the bidirectional variant SMBJ20CA-E3/5B must be used, which provides symmetrical clamping in both directions. Using SMBJ20A-E3/5B on AC-coupled or floating signals risks forward conduction, excessive leakage, or failure to clamp negative transients. Always match device polarity to circuit topology.
SMBJ20A-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:
- 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-E3/5B FAQ
1.How can I place an order for SMBJ20A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20A-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 SMBJ20A-E3/5B reliable?
The price and inventory of SMBJ20A-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 SMBJ20A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ20A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20A-E3/5B?
SMBJ20A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20A-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 SMBJ20A-E3/5B?
For technical support, including SMBJ20A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20A-E3/5B requirements.
6.How does Aetrix verify that SMBJ20A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ20A-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 SMBJ20A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ20A-E3/5B?
All SMBJ20A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20A-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 SMBJ20A-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ20A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20A-E3/5B Tags
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