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Vishay General Semiconductor - Diodes Division SMBG17A/54
- Part No.:
- SMBG17A/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG17A/54.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,901
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Product details
Overview
SMBG17A/54 from Littelfuse is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 17 V stand-off voltage (VWM), 18.9–20.9 V breakdown voltage (VBR), 600 W peak pulse power (10/1000 µs), <5.0 µA reverse leakage at VWM, and clamps transients to ≤27.6 V at 21.7 A, making it suitable for industrial power supply input protection.
For engineers reviewing the SMBG17A/54 datasheet, SMBG17A/54 pinout, SMBG17A/54 application, or SMBG17A/54 equivalent, key selection criteria include its DO-214AA package compatibility, unidirectional polarity with cathode band marking, 600 W surge rating, low clamping ratio (VC/VBR ≈ 1.38), and suitability for IEC 61000-4-5 level 3 surge immunity designs.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 GΩ) above 17 V, then rapidly avalanches below 21 V to divert surge current to ground. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance, critical for consistent clamping during repetitive transients.
The device is rated for 100 A non-repetitive forward surge (8.3 ms half-sine) and supports high-temperature soldering (250 °C/10 s). Its fast response time (<1.0 ps from 0 V to VBR) enables protection of sensitive downstream ICs against ESD and lightning-induced surges before damage occurs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 17 V - Maximum continuous reverse operating voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 18.9–20.9 V at 1.0 mA - Confirmed avalanche onset range defining reliable triggering threshold |
| Clamping Voltage (VC) | 27.6 V at 21.7 A - Maximum voltage seen by protected circuit during 600 W surge event |
| Peak Pulse Power (PPPM) | 600 W (10/1000 µs) - Sustained energy absorption capability without failure |
| Reverse Leakage (ID) | <5.0 µA at 17 V - Negligible standby power loss and minimal loading on source |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with gull-wing leads for automated assembly |
| Polarity | Unidirectional - Cathode marked by color band; blocks reverse current until breakdown |
Pinout & Package
Package: DO-214AA (SMB), plastic molded body with glass-passivated junction, gull-wing terminals, cathode indicated by color band. Mountable in any orientation; weight 0.093 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or return path to complete shunt conduction path during surge |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., +12 V rail); color band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables robust protection against IEC 61000-4-5 combination wave surges (e.g., 2 Ω source impedance, 1 kV) |
| Clamping ratio (VC/VBR) ≈ 1.38 | Minimizes overvoltage stress on downstream components compared to higher-ratio TVS devices |
| Fast response time <1.0 ps | Ensures protection activation before ESD or fast-edge transients propagate into IC inputs |
| UL 94V-0 flammability rating | Confirms safe operation under fault conditions without flame propagation in end equipment |
| 250 °C/10 s soldering tolerance | Supports standard reflow profiles without junction degradation or bond wire failure |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) Supply Rail |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between +24 V and chassis ground to clamp transients before they reach DC-DC converter input. Use Value: Limits voltage excursion to ≤27.6 V during 600 W surges, preventing overvoltage shutdown or damage to upstream rectifier and downstream regulator ICs. | Use Scenario: 12 V battery-supplied microcontroller power domain in BCM subjected to ISO 7637-2 pulse 1 and pulse 2a. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main VCC rail, positioned immediately after fuse and before bulk capacitor. Use Value: Withstands 100 A surge (8.3 ms) and clamps ISO 7637-2 pulse 1 (−150 V/50 Ω) to safe levels, preserving MCU functionality and EEPROM integrity. |
| Telecom Line Interface Protection | Motor Drive Control Signal Conditioning |
Use Scenario: RS-485 transceiver power supply (VDD) in outdoor base station equipment subject to lightning-induced surges on nearby AC mains. IC Role / Device Role / Timing Role: Secondary protection device on isolated 3.3 V or 5 V bias rail feeding RS-485 PHY, coordinated with primary MOV/GDT stage. Use Value: Provides precise low-voltage clamping (27.6 V max) with sub-nanosecond response, ensuring transceiver ICs survive residual surges that pass through front-end filtering. | Use Scenario: 24 V control signal line driving optocoupler input in variable-frequency drive (VFD) gate driver board. IC Role / Device Role / Timing Role: Fast-acting shunt suppressor on digital enable/disable line susceptible to coupling from adjacent IGBT switching noise. Use Value: Low leakage (<5 µA) avoids false triggering; 27.6 V clamping prevents latch-up in optocoupler LED driver while maintaining signal integrity during 10/1000 µs transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ17A | Identical electrical specs (VWM = 17 V, VBR = 18.9–20.9 V, VC = 27.6 V), same DO-214AA package, but manufactured by different Littelfuse product line with alternate marking (KE vs LR) | No functional difference; both qualified for identical surge standards and mounting processes | Select SMBJ17A if legacy BOM references SMBJ-series nomenclature or distributor stock favors that prefix |
| 1.5SMC17A | Same VWM and VC, but in larger DO-214AB (SMC) package; 1.5 kW rating vs 600 W; higher thermal mass and lower Rsurge | Better suited for higher-energy threats (e.g., direct lightning coupling) but requires larger PCB area and different pad layout | Choose 1.5SMC17A only when surge threat level exceeds 600 W or thermal cycling reliability demands larger case size |
Compared with SMBG17A/54, SMBJ17A offers identical protection performance in the same footprint, while 1.5SMC17A trades board space for higher surge endurance-making SMBG17A/54 optimal for space-constrained 600 W-class industrial and automotive DC rail protection.
Availability
SMBG17A/54 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom interface modules, and motor control systems requiring stable component supply and long-term obsolescence management.
Supply support for SMBG17A/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
Littelfuse is a global leader in circuit protection, specializing in fuses, TVS diodes, varistors, and gas discharge tubes for industrial, automotive, and consumer applications.
The SMBG series is part of Littelfuse's surface-mount TVS portfolio engineered specifically for high-reliability DC power rail and signal line protection where compact size, precise clamping, and UL 94V-0 compliance are mandatory.
FAQ
What is the maximum clamping voltage of SMBG17A/54 under full-rated surge current?
The SMBG17A/54 clamps to a maximum of 27.6 V when subjected to its rated peak pulse current of 21.7 A (10/1000 µs waveform). This value is measured per JEDEC test conditions and represents the worst-case voltage imposed on the protected circuit during a 600 W transient event. Designers must ensure downstream components tolerate this clamped voltage with margin.
Is SMBG17A/54 unidirectional or bidirectional, and how is polarity identified?
SMBG17A/54 is a unidirectional TVS diode. Polarity is identified by a color band on the cathode end of the DO-214AA package. The cathode connects to the protected line (e.g., +12 V), and the anode connects to ground. Bidirectional variants use suffix "C" or "CA" (e.g., SMBG17CA), which SMBG17A/54 does not carry.
What is the reverse leakage current specification for SMBG17A/54 at its stand-off voltage?
At its 17 V stand-off voltage (VWM) and 25 °C ambient temperature, SMBG17A/54 exhibits a maximum reverse leakage current (ID) of 5.0 µA. This low leakage ensures minimal power loss and no measurable loading on voltage rails, supporting efficient operation in always-on industrial and automotive systems.
Can SMBG17A/54 be used in place of SMBJ17A in an existing design?
Yes, SMBG17A/54 is functionally and physically interchangeable with SMBJ17A: both share identical electrical parameters (VWM, VBR, VC, PPPM), DO-214AA package dimensions, gull-wing leadform, and thermal ratings. The SMBG17A/54 marking (LR) and SMBJ17A (KE) reflect internal Littelfuse product family distinctions but do not affect performance or layout.
What industry standards does SMBG17A/54 meet for surge immunity testing?
SMBG17A/54 is characterized to meet IEC 61000-4-5 (surge immunity) and ISO 7637-2 (automotive transients) requirements when applied per recommended PCB layout (0.2 × 0.2 inch copper pads). Its 600 W rating aligns with Level 3 (2 kV line-to-earth, 1 kV line-to-line) per IEC 61000-4-5, and its 100 A 8.3 ms surge rating satisfies ISO 7637-2 Pulse 1 and Pulse 5a test profiles.
SMBG17A/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- Series:
- TransZorb®
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 21.7A
- 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 (SMBG)
SMBG17A/54 FAQ
1.How can I place an order for SMBG17A/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG17A/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 SMBG17A/54 reliable?
The price and inventory of SMBG17A/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG17A/54 is usually 5 days.
3.What payment methods are accepted for SMBG17A/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG17A/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG17A/54?
SMBG17A/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG17A/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 SMBG17A/54?
For technical support, including SMBG17A/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG17A/54 requirements.
6.How does Aetrix verify that SMBG17A/54 is sourced from the original manufacturer or authorized distributors?
All SMBG17A/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 SMBG17A/54 meets industry standards.
7.What is the process for return or replacement of SMBG17A/54?
All SMBG17A/54 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG17A/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 SMBG17A/54 part is unused and in its original packaging.
Return procedure for SMBG17A/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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