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Vishay General Semiconductor - Diodes Division SMBG12A/54
- Part No.:
- SMBG12A/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG12A/54.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,554
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Product details
Overview
SMBG12A/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 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR), 600 W peak pulse power (10/1000 µs), <5.0 µA reverse leakage at VWM, and clamps transients to ≤19.9 V at 30.2 A peak pulse current - deployed in industrial power supplies, automotive ECUs, and PoE interfaces.
For engineers reviewing the SMBG12A/54 datasheet, SMBG12A/54 pinout, SMBG12A/54 application, or SMBG12A/54 equivalent, key selection criteria include its DO-215AA gull-wing package, unidirectional polarity, 19.9 V clamping voltage at rated IPPM, low 1.0 ps response time, and compatibility with high-temperature reflow (250°C/10 s).
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast transient suppression in high-impedance circuits. Its low incremental surge resistance and built-in strain relief support robust surge handling under IEC 61000-4-5 Level 3/4 threats without thermal runaway.
The device operates across –55°C to +150°C junction temperature and maintains stable clamping performance when mounted on 0.2 × 0.2 inch copper pads - critical for sustained reliability in motor drive gate drivers and telecom line cards where repetitive switching transients occur.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 12 V - maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 13.3–14.7 V at 1.0 mA - ensures reliable turn-on during overvoltage events |
| Clamping Voltage (VC) | 19.9 V at 30.2 A (10/1000 µs) - limits downstream voltage stress to safe levels |
| Peak Pulse Power (PPPM) | 600 W - handles lightning-induced surges per IEC 61000-4-5 with 0.01% duty cycle |
| Reverse Leakage (ID) | <5.0 µA at 12 V - minimizes standby power loss in battery-backed systems |
| Response Time | <1.0 ps - enables protection of high-speed logic and analog front-ends |
| Junction Temp Range | –55°C to +150°C - supports operation in under-hood automotive and industrial enclosures |
Pinout & Package
Package: DO-215AA gull-wing surface-mount package with solder-plated terminals compliant with MIL-STD-750 Method 2026; color band denotes cathode (unidirectional polarity); weight 0.093 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or lowest potential node during clamping |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 12 V rail or signal trace) - marked by color band |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD, inductive kick) |
| 600 W peak pulse rating (10/1000 µs) | Meets IEC 61000-4-5 surge immunity requirements for industrial equipment |
| High-temp soldering guarantee | Withstands 250°C for 10 s at terminals - compatible with lead-free reflow profiles |
| Built-in strain relief | Reduces mechanical stress on solder joints during board flexure or thermal expansion |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate driver ICs and microcontrollers against inductive switching spikes from BLDC motor coils. IC Role / Device Role / Timing Role: Unidirectional TVS placed between high-side switch output and ground to clamp negative flyback voltage. Use Value: Limits voltage excursion to ≤19.9 V, preventing latch-up or oxide breakdown in 3.3 V/5 V logic interfaces. | Use Scenario: Input protection for LIN bus transceivers and sensor supply rails exposed to load-dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V battery feed line upstream of LDO regulators. Use Value: Withstands 600 W surges while maintaining <5 µA leakage - avoids quiescent current penalty in always-on modules. |
| Telecom Power Feeds | Programmable Logic Controllers |
Use Scenario: Overvoltage safeguard on 48 V DC power inputs of remote radio units and base station backhaul interfaces. IC Role / Device Role / Timing Role: Primary surge clamp on PoE-powered equipment input stage before DC-DC conversion. Use Value: Clamps 10/1000 µs transients to 19.9 V at 30.2 A - preserves integrity of isolated feedback circuits and optocouplers. | Use Scenario: Protection of digital I/O channels and analog sensor inputs against EFT and surge coupling from adjacent AC wiring. IC Role / Device Role / Timing Role: Point-of-entry TVS on field-side signal terminals before isolation barriers. Use Value: Sub-1 ps response ensures clamping occurs before transient propagates into FPGA or ADC front-end. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A | Same VWM (12 V), identical VBR range (13.3–14.7 V), same DO-214AA package (modified J-bend) | Requires PCB pad redesign due to J-bend vs. gull-wing leadform; slightly higher thermal resistance | Select when legacy layout uses DO-214AA footprint and rework is acceptable |
| P6SMB12A | Same electrical specs but in DO-214AA package; 600 W rating confirmed; VC = 19.9 V at 30.2 A | Not qualified for automotive AEC-Q101; limited high-temp storage data beyond +125°C | Prefer for cost-sensitive industrial controls where extended temperature validation is not required |
Compared with SMBG12A/54, SMBJ12A offers identical electrical performance but demands layout adaptation for J-bend leads, while P6SMB12A trades automotive qualification and extended junction temperature margin for lower unit cost in non-automotive settings.
Availability
SMBG12A/54 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, consistent surge performance, and long-lifecycle availability.
Supply support for SMBG12A/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, and overcurrent devices for automotive, industrial, and consumer markets.
The SMBG series is engineered for high-reliability surface-mount transient suppression in harsh environments - targeting applications demanding repeatable clamping, low leakage, and AEC-Q101-compliant robustness.
FAQ
What is the clamping voltage of SMBG12A/54 at its rated peak pulse current?
The SMBG12A/54 clamps to a maximum of 19.9 V at its rated peak pulse current of 30.2 A under the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and guarantees predictable voltage limiting during surge events - critical for protecting downstream 3.3 V or 5 V logic circuits without overstressing their absolute maximum ratings. The SMBG12A/54 achieves this with minimal overshoot due to its low incremental surge resistance.
Is SMBG12A/54 unidirectional or bidirectional, and how is polarity identified?
SMBG12A/54 is a unidirectional TVS diode. Polarity is indicated by a color band on the cathode end of the DO-215AA gull-wing package - the banded end connects to the protected line (e.g., 12 V rail), while the anode connects to ground. This configuration allows it to suppress positive transients only; bidirectional variants use suffix "C" or "CA" (e.g., SMBG12CA). The SMBG12A/54's unidirectional design yields lower leakage (<5 µA) and tighter VBR tolerance than equivalent bidirectional types.
What is the maximum operating temperature range for SMBG12A/54?
The SMBG12A/54 has a specified junction and storage temperature range of –55°C to +150°C. This wide range supports deployment in under-hood automotive ECUs, industrial inverters, and outdoor telecom equipment where ambient temperatures exceed 105°C. Derating curves in the official Littelfuse datasheet confirm full 600 W pulse capability up to +85°C ambient when mounted on 0.2 × 0.2 inch copper pads - essential for thermal design validation of the SMBG12A/54 in high-power applications.
Does SMBG12A/54 meet any industry surge immunity standards?
Yes, the SMBG12A/54 is designed to meet IEC 61000-4-5 (surge immunity) and IEC 61000-4-2 (ESD) requirements when properly applied in circuit. Its 600 W peak pulse power rating with 10/1000 µs waveform aligns with Level 3 and Level 4 surge testing per IEC 61000-4-5, and its sub-1 ps response time satisfies fast-transient suppression needs in EN 55032 and CISPR 32-compliant designs. System-level compliance depends on PCB layout and grounding - the SMBG12A/54 alone does not constitute full certification.
Can SMBG12A/54 be used in place of SMBJ12A without board modifications?
No - SMBG12A/54 uses a DO-215AA gull-wing package, while SMBJ12A uses DO-214AA with modified J-bend leads. Their land patterns, solder joint geometry, and thermal pad requirements differ. Substituting SMBG12A/54 for SMBJ12A requires PCB footprint revision and requalification of solder joint reliability. Both share identical electrical specs (VWM = 12 V, VC = 19.9 V), but mechanical incompatibility makes them non-drop-in replacements. Always verify mechanical fit before using SMBG12A/54 in existing SMBJ12A layouts.
SMBG12A/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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 30.2A
- 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)
SMBG12A/54 FAQ
1.How can I place an order for SMBG12A/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG12A/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 SMBG12A/54 reliable?
The price and inventory of SMBG12A/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG12A/54 is usually 5 days.
3.What payment methods are accepted for SMBG12A/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG12A/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG12A/54?
SMBG12A/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG12A/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 SMBG12A/54?
For technical support, including SMBG12A/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG12A/54 requirements.
6.How does Aetrix verify that SMBG12A/54 is sourced from the original manufacturer or authorized distributors?
All SMBG12A/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 SMBG12A/54 meets industry standards.
7.What is the process for return or replacement of SMBG12A/54?
All SMBG12A/54 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG12A/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 SMBG12A/54 part is unused and in its original packaging.
Return procedure for SMBG12A/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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