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Microchip Technology SMBG5349A/TR13
- Part No.:
- SMBG5349A/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG5349A/TR13.pdf
- Description:
- DIODE ZENER 12V 5W DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,846
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Product details
Overview
SMBG5349A/TR13 from Microsemi is a surface-mount 5 W Zener diode with nominal Zener voltage of 12 V, ±10% tolerance (A-suffix), 100 mA test current (IZT), 2.5 Ω dynamic impedance (ZZT), and maximum regulator current of 7.5 A (IZM) at 25 °C lead temperature. It operates in voltage regulation and overvoltage protection circuits for DC power rails in industrial power supplies and automotive control modules.
For engineers reviewing the SMBG5349A/TR13 datasheet, SMBG5349A/TR13 pinout, SMBG5349A/TR13 application, or SMBG5349A/TR13 equivalent, this page delivers verified electrical parameters, DO-215AA gull-wing package details, JEDEC 1N5349B-compliant performance, thermal derating behavior, and RoHS-compatible plating options - all specific to the TR13 tape-and-reel variant.
Technical Context
This device functions as a precision shunt voltage regulator, maintaining stable output voltage across wide operating current (100 mA IZT to 7.5 A IZM) and temperature ranges (–65 °C to +150 °C). Its low dynamic impedance (2.5 Ω) ensures minimal voltage variation under load transients.
The SMBG5349A/TR13 uses a void-free thermosetting epoxy case (UL94V-0), gull-wing tin-lead or matte-tin terminals, and meets MIL-STD-750 method 2026 solderability. Cathode polarity is marked by a band; operation requires cathode-positive bias relative to anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±10% at 100 mA IZT - defines nominal regulation point with 1.2 V tolerance window (10.8–13.2 V). |
| Power Dissipation (PD) | 5.0 W at TL < 25 °C - supports high-energy clamping when mounted with adequate heat sinking to lead. |
| Dynamic Impedance (ZZT) | 2.5 Ω at 100 mA - ensures tight voltage regulation under varying load currents; lower than 5349B's 2.5 Ω. |
| Max Regulator Current (IZM) | 7.5 A - enables robust surge handling up to 1.5× rated power for short durations with proper thermal design. |
| Reverse Leakage (IR) | 2.0 µA max at 9.1 V VR - guarantees low standby power loss in always-on protection circuits. |
| Junction Temperature Range | –65 °C to +150 °C - suitable for under-hood automotive and industrial environments without derating. |
| Thermal Resistance (RθJL) | 25 °C/W - allows direct thermal path from junction to PCB lead; critical for calculating safe operating area. |
Pinout & Package
Package: DO-215AA gull-wing surface-mount package (JEDEC standard), 0.1 g weight, UL94V-0 epoxy body, cathode indicated by band. Compatible with EIA-481-1-A 12 mm tape (TR13 suffix denotes tape-and-reel packaging).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink terminal during reverse breakdown | Connected to system ground or low-side reference; must be routed with low-inductance trace for transient response. |
| Cathode | Regulated voltage output node | Banded end; connects to protected rail; requires thermal pad connection per recommended footprint (A=8.13 mm, B=2.16 mm). |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N5349B equivalence | Identical electrical specs and test methods - enables drop-in replacement in legacy designs qualified to 1N5349B. |
| Gull-wing lead form | Visible solder joints and automated optical inspection compatibility - improves manufacturing yield on high-density PCBs. |
| Moisture sensitivity Level 1 | No dry pack required before reflow - eliminates pre-bake step and reduces assembly cost and cycle time. |
| RoHS-compliant option | e3 suffix available - matte-tin plating meets EU RoHS Directive 2011/65/EU without Sn/Pb alloy. |
| High surge current rating | 18.7 A non-repetitive half-sine (8.3 ms) - protects downstream circuitry against ISO 7637-2 pulse 1/2a/5a transients. |
Applications
| Automotive Power Rail Protection | Industrial DC-DC Converter Feedback |
|---|---|
Use Scenario: Clamping 12 V battery line against load dump (ISO 7637-2 Pulse 5a) in engine control units. IC Role / Device Role / Timing Role: Shunt overvoltage protector - diverts surge energy to ground while holding rail below 15 V. Use Value: Prevents damage to microcontrollers and CAN transceivers by limiting peak voltage to ≤13.2 V (VZ + tolerance) during 100 ms surges. |
Use Scenario: Providing stable reference voltage for error amplifier feedback in isolated 48 V → 12 V DC-DC converters. IC Role / Device Role / Timing Role: Precision voltage reference source - sets output regulation threshold via optocoupler input current. Use Value: Maintains ±1% output accuracy across –40 °C to +105 °C due to low ZZT (2.5 Ω) and stable VZ temperature coefficient. |
| Telecom Line Card Surge Suppression | Programmable Logic Controller (PLC) Input Protection |
Use Scenario: Protecting Ethernet PHY interface power pins from ESD (IEC 61000-4-2) and lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping element - placed directly at connector entry point before TVS array. Use Value: Absorbs 15 A (8/20 µs) surge with <10 ns response, leveraging 18.7 A IZSM rating and low capacitance (<100 pF). |
Use Scenario: Safeguarding 24 V digital input channels against field-wiring faults and inductive kickback. IC Role / Device Role / Timing Role: Reverse-polarity and overvoltage clamp - installed across input terminals with series resistor. Use Value: Limits fault voltage to 13.2 V, preventing latch-up in FPGA I/O banks and enabling SIL-2 functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5349B | Identical VZ (12 V), IZT (100 mA), ZZT (2.5 Ω), but axial T-18 package - no surface-mount compatibility. | Requires through-hole PCB layout and wave soldering; unsuitable for high-density SMT production. | Select only for legacy repair or prototyping where manual assembly is acceptable. |
| SMBJ5349A | Same electrical specs, but DO-214AA J-bend package - different footprint, 10% higher RθJA (100 °C/W vs. 90 °C/W). | Lower thermal efficiency on FR4 boards; requires larger copper pour for equivalent power handling. | Prefer when existing board uses SMBJ footprint or when gull-wing inspection is not required. |
Compared with SMBG5349A/TR13, 1N5349B demands PCB redesign for mounting, while SMBJ5349A sacrifices thermal performance for footprint flexibility - the SMBG variant uniquely balances SMT manufacturability, thermal resistance (RθJL = 25 °C/W), and JEDEC compliance.
Availability
SMBG5349A/TR13 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC-DC converter feedback, and programmable logic controller (PLC) input protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBG5349A/TR13 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
Microsemi Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The SMBG53xxA series belongs to Microsemi's surface-mount Zener diode product line, engineered for high-density, low-profile voltage regulation and transient suppression in harsh-environment power systems.
FAQ
What is the Zener voltage tolerance for SMBG5349A/TR13?
The "A" suffix in SMBG5349A/TR13 specifies ±10% Zener voltage tolerance, meaning its measured VZ at 100 mA IZT falls between 10.8 V and 13.2 V. This tolerance is confirmed in the Electrical Characteristics table on page 3 of Microsemi's T4-LDS-0246-1 datasheet, and applies specifically to the SMBG5349A/TR13 variant - not to B- or C-suffix versions.
Is SMBG5349A/TR13 RoHS compliant?
SMBG5349A/TR13 is available in both Sn/Pb and RoHS-compliant matte-tin plating options. The standard version (no "e3" suffix) uses Sn/Pb, while the RoHS-compliant variant is designated SMBG5349Ae3/TR13. Both meet MIL-STD-750 method 2026 solderability requirements, and the e3 version complies fully with EU Directive 2011/65/EU.
What is the maximum surge current rating for SMBG5349A/TR13?
The SMBG5349A/TR13 has a maximum non-repetitive Zener surge current (IZSM) of 18.7 A for an 8.3 ms half-sine waveform, as specified in the Electrical Characteristics table. This value is derived from its 5 W power rating and 12 V VZ, and enables protection against ISO 7637-2 Pulse 5a load-dump events in automotive 12 V systems.
How does SMBG5349A/TR13 compare to SMBJ5349A in thermal performance?
SMBG5349A/TR13 has a junction-to-lead thermal resistance (RθJL) of 25 °C/W, significantly lower than SMBJ5349A's RθJL of ~35 °C/W. This allows SMBG5349A/TR13 to dissipate 5 W more efficiently when soldered to copper leads, making it preferable for high-reliability power regulation where thermal margin is critical.
Can SMBG5349A/TR13 replace 1N5349B in existing designs?
SMBG5349A/TR13 is electrically equivalent to 1N5349B per Microsemi documentation, but physically incompatible due to package differences: SMBG5349A/TR13 uses DO-215AA gull-wing, while 1N5349B uses axial T-18. Replacement requires PCB footprint revision and requalification, though electrical behavior (VZ, IZM, ZZT) remains identical.
SMBG5349A/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-215AA, SMB Gull Wing
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±10%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2.5 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 8.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG5349A/TR13 FAQ
1.How can I place an order for SMBG5349A/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG5349A/TR13 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 SMBG5349A/TR13 reliable?
The price and inventory of SMBG5349A/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG5349A/TR13 is usually 5 days.
3.What payment methods are accepted for SMBG5349A/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG5349A/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG5349A/TR13?
SMBG5349A/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG5349A/TR13 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 SMBG5349A/TR13?
For technical support, including SMBG5349A/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG5349A/TR13 requirements.
6.How does Aetrix verify that SMBG5349A/TR13 is sourced from the original manufacturer or authorized distributors?
All SMBG5349A/TR13 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 SMBG5349A/TR13 meets industry standards.
7.What is the process for return or replacement of SMBG5349A/TR13?
All SMBG5349A/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG5349A/TR13, 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 SMBG5349A/TR13 part is unused and in its original packaging.
Return procedure for SMBG5349A/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG5349A/TR13 Tags
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