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Diodes Incorporated SMBJ20A-13-F
- Part No.:
- SMBJ20A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20A-13-F.pdf
- Description:
- TVS DIODE 20VWM 32.4VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:221,660
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Product details
Overview
SMBJ20A-13-F from Diodes Incorporated is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode with 20V reverse standoff voltage, 22.2V minimum breakdown voltage at 1mA test current, and 32.4V maximum clamping voltage at 18.5A peak pulse current. It features glass-passivated die construction, SMB package, and is used for ESD and surge protection in DC power rails and I/O interfaces of industrial controllers.
For engineers reviewing the SMBJ20A-13-F datasheet, SMBJ20A-13-F pinout, SMBJ20A-13-F application, or SMBJ20A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, peak pulse current handling under 8.3ms half-sine surge, thermal derating above +25°C, and RoHS-compliant matte tin lead finish compatibility with lead-free reflow.
Technical Context
This TVS diode operates as a unidirectional clamping device-forward-biased during positive transients on the cathode side, providing low-impedance shunt path to ground. Its glass-passivated junction ensures stable leakage (<5μA at 20V) and repeatable breakdown behavior across temperature (-55°C to +150°C).
The SMB package enables high-power dissipation (5.0W at TL = +75°C) with minimal PCB footprint. Pulse derating follows linear 4.8W/°C reduction above +25°C ambient, and it withstands 100A non-repetitive forward surge per 8.3ms half-sine waveform.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600W - sustains single 8.3ms surge without failure; defines maximum energy absorption capability |
| Reverse Standoff Voltage | 20V - maximum continuous DC voltage before significant leakage; sets operating rail upper limit |
| Breakdown Voltage | 22.2–25.5V @ 1mA - onset of avalanche conduction; must exceed system operating voltage by ≥10% |
| Clamping Voltage | 32.4V @ 18.5A - maximum voltage seen by protected circuit during rated surge; determines safe margin for downstream ICs |
| Leakage Current | ≤5.0μA @ 20V - negligible standby power loss; avoids false triggering or battery drain in low-power systems |
| Package | SMB - standardized surface-mount outline (5.00–5.59mm length, 3.30–3.94mm width); compatible with automated pick-and-place |
| Operating Temp | -55°C to +150°C - supports industrial and automotive under-hood applications without derating |
Pinout & Package
Two-terminal SMB package: anode and cathode terminals aligned along body length; cathode indicated by band on top surface. Designed for bidirectional thermal conduction via solder pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path to ground reference | Connected to system ground plane; requires low-inductance layout to minimize clamping overshoot |
| Cathode | Protected line connection point | Placed directly at IC power input or signal line entry; clamps transients toward ground when voltage exceeds VRWM |
Key Features
| Feature | Design Value |
|---|---|
| 600W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 (4kV/2Ω) surges on 24V industrial buses |
| Glass-passivated die | Ensures long-term parameter stability and resistance to humidity-induced degradation in harsh environments |
| RoHS-compliant matte tin plating | Supports Pb-free reflow profiles (peak 260°C) without whisker formation or solder joint reliability issues |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage stress on protected ICs-critical for 3.3V/5V logic interfacing with 20V rails |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24V digital input channels from inductive kickback and load dump transients in programmable logic controllers. IC Role / Device Role: Unidirectional TVS placed between field input and optocoupler/analog front-end. Use Value: Clamps 18.5A surge to ≤32.4V, preventing damage to 3.3V microcontroller GPIOs referenced to isolated 24V supply. |
Use Scenario: Safeguarding LIN bus transceivers and sensor inputs against battery reverse polarity and jump-start spikes. IC Role / Device Role: Primary surge clamp on 12V power rail feeding BCM sub-circuits. Use Value: Withstands 100A 8.3ms surge per ISO 7637-2 Pulse 5a, maintaining <5μA leakage to avoid sleep-current violations. |
| DC Power Supply Input | Telecom Remote Terminal Unit |
Use Scenario: Front-end protection for 20V-rated DC-DC converters in outdoor telecom cabinets exposed to lightning-induced surges. IC Role / Device Role: First-line clamping device upstream of input filter and converter IC. Use Value: Limits transient voltage to 32.4V, preserving MOSFET gate oxide integrity and enabling use of lower-voltage-rated input capacitors. |
Use Scenario: Shielding RS-485 transceiver power pins from EFT bursts and cable discharge events in remote monitoring units. IC Role / Device Role: Localized TVS adjacent to transceiver VCC pin on 24V auxiliary rail. Use Value: Achieves <10ns response time and 32.4V clamping, ensuring transceiver survives IEC 61000-4-4 Level 4 (2kV) fast transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A-E3/52 (Vishay) | Same 20V VRWM, 32.4V VC, but 1000pF typical capacitance vs. Diodes' 100pF (typ) at 1MHz | Higher capacitance limits use in >1MHz signal lines; acceptable for DC power rails only | Select when sourcing flexibility is prioritized and signal bandwidth is not critical |
| P6SMB20A (ON Semiconductor) | Identical electrical specs but longer lead time (12+ weeks) and no tape-and-reel option below 3,000 pcs | Not suitable for high-volume SMT production requiring consistent reel delivery | Prefer for prototyping or low-volume builds where Diodes' -13-F packaging is unavailable |
Compared with Vishay's SMBJ20A-E3/52 and ON Semi's P6SMB20A, the SMBJ20A-13-F offers lower junction capacitance for noise-sensitive applications and guaranteed 3,000-piece tape-and-reel availability-critical for automated manufacturing continuity.
Availability
SMBJ20A-13-F is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and DC power supply input stages requiring stable component supply, full RoHS compliance, and verified surge performance.
Supply support for SMBJ20A-13-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the US.
The SMBJ series belongs to Diodes' transient suppression portfolio, engineered specifically for high-energy surge immunity in industrial automation, automotive electronics, and telecom infrastructure-emphasizing repeatable clamping, low leakage, and robust thermal performance.
FAQ
What is the maximum clamping voltage for SMBJ20A-13-F at its rated peak pulse current?
The maximum clamping voltage is 32.4V at 18.5A peak pulse current (IPP), measured under the standard 8.3ms half-sine waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range (-55°C to +150°C) and defines the worst-case overvoltage imposed on protected circuitry during surge events.
Is SMBJ20A-13-F suitable for bidirectional signal line protection?
No-SMBJ20A-13-F is unidirectional and contains a cathode band marking. For bidirectional protection (e.g., RS-485 data lines), the bi-directional variant SMBJ20CA-13-F must be used. Using the unidirectional part on AC-coupled or symmetric signal paths risks forward conduction and latch-up during negative transients.
How does the SMB package affect thermal performance in high-density PCB layouts?
The SMB package delivers 5.0W steady-state power dissipation at TL = +75°C when leads are maintained at ambient temperature. In high-density layouts, thermal relief pads and copper pour under the device improve heat spreading, but derating to 3.2W is recommended at TA = +70°C to maintain junction temperature below 150°C per JEDEC JESD51-2.
Does SMBJ20A-13-F meet automotive AEC-Q200 requirements?
No-SMBJ20A-13-F is qualified for commercial temperature range (-55°C to +150°C) and RoHS compliance, but it is not AEC-Q200 stress-tested. For automotive-grade applications, Diodes' AEC-Q200-qualified equivalents such as D3SB20H-13 (SMB, 20V, AEC-Q200 Grade 2) should be selected instead.
SMBJ20A-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- 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:
- SMB
SMBJ20A-13-F FAQ
1.How can I place an order for SMBJ20A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20A-13-F 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-13-F reliable?
The price and inventory of SMBJ20A-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20A-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ20A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20A-13-F?
SMBJ20A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20A-13-F 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-13-F?
For technical support, including SMBJ20A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20A-13-F requirements.
6.How does Aetrix verify that SMBJ20A-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ20A-13-F 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-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ20A-13-F?
All SMBJ20A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20A-13-F, 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-13-F part is unused and in its original packaging.
Return procedure for SMBJ20A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20A-13-F Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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