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Microchip Technology SMBG5349B/TR13
- Part No.:
- SMBG5349B/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG5349B/TR13.pdf
- Description:
- DIODE ZENER 12V 5W DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,576
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Product details
Overview
SMBG5349B/TR13 from Microsemi is a surface-mount 5 W Zener diode with nominal breakdown voltage of 12 V, ±5% tolerance (B suffix), 100 mA test current (IZT), and 2.5 Ω dynamic impedance (ZZT) at IZT - used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the SMBG5349B/TR13 datasheet, SMBG5349B/TR13 pinout, SMBG5349B/TR13 application, or SMBG5349B/TR13 equivalent, key selection criteria include Zener voltage accuracy, surge current capability (7.5 A IZSM), thermal resistance (25 °C/W junction-to-lead), DO-215AA gull-wing package compatibility, and RoHS-compliant matte-tin plating.
Technical Context
This device operates in reverse-biased breakdown mode to maintain stable reference voltage across wide current (100 mA IZT to 7.5 A non-repetitive surge) and temperature (-65 to +150 °C) ranges. Its low dynamic impedance (2.5 Ω) ensures minimal voltage variation under load transients.
The DO-215AA gull-wing package enables visible solder joints and supports high-density PCB layouts. With Level 1 moisture sensitivity and no dry-pack requirement, SMBG5349B/TR13 is suitable for standard reflow processes without special handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±5% - precise regulation point at 100 mA test current, enabling accurate feedback in switching power supplies. |
| Power Dissipation (PD) | 5.0 W @ TL < 25 °C - supports robust continuous operation with adequate heat sinking on FR4 board. |
| Dynamic Impedance (ZZT) | 2.5 Ω @ 100 mA - low AC impedance ensures stable output voltage during rapid load changes. |
| Max Surge Current (IZSM) | 7.5 A (8.3 ms half-sine) - withstands transient overvoltage events without failure. |
| Junction Temp Range | -65 to +150 °C - validated for automotive under-hood and industrial control environments. |
| Thermal Resistance (RθJL) | 25 °C/W - enables efficient heat transfer to PCB copper, critical for sustained 5 W operation. |
| Reverse Leakage (IR) | 2.0 µA @ 9.1 V - ultra-low leakage preserves regulation accuracy in low-power standby modes. |
Pinout & Package
DO-215AA gull-wing surface-mount package with cathode band marking; terminals are anode (unbanded end) and cathode (banded end); polarity must be observed for correct reverse-bias operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential node in Zener regulation. | Must be routed to ground or return path when used as shunt regulator. |
| Cathode | Current exit terminal in forward bias; connected to higher-potential node in Zener regulation. | Banded end connects to regulated rail; determines polarity of clamping action. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N5349B equivalence | Identical electrical specs and test methods - allows drop-in replacement in legacy designs qualified to 1N5349B. |
| Gull-wing lead form | Visible solder joints enable AOI inspection and reduce tombstoning risk during reflow. |
| Level 1 moisture sensitivity | No dry pack or baking required - simplifies SMT line logistics and reduces assembly cost. |
| RoHS-compliant matte-tin plating | Lead-free finish compatible with Pb-free soldering and meets environmental compliance mandates. |
| High surge current rating | 7.5 A peak (8.3 ms) - protects downstream circuitry from ESD and lightning-induced transients. |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters by feeding error signal to optocoupler input. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 12 V reference for TL431 or optocoupler bias. Use Value: Tight ±5% VZ tolerance and 2.5 Ω ZZT ensure <±1% output regulation across line/load/temperature. | Use Scenario: Clamps transient spikes on 12 V rail caused by relay coil de-energization or motor commutation. IC Role / Device Role / Timing Role: Passive overvoltage protector diverting surge current away from sensitive ICs. Use Value: 7.5 A IZSM rating absorbs 8.3 ms surges without degradation, extending system reliability. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) |
Use Scenario: Stabilizes excitation voltage for bridge-based pressure sensors operating in 12 V systems. IC Role / Device Role / Timing Role: Precision voltage reference source for analog front-end biasing. Use Value: -65 to +150 °C operating range and low IR (2.0 µA @ 9.1 V) maintain accuracy in harsh sensor environments. | Use Scenario: Protects microcontroller I/O pins from load-dump transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Transient voltage suppressor placed at power entry point before LDO regulators. Use Value: DO-215AA gull-wing footprint fits high-density BCM PCBs while meeting ISO 7637-2 pulse 5a requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5349B | Same VZ (12 V), IZT (100 mA), ZZT (2.5 Ω), but axial T-18 package - not surface-mount. | Requires through-hole assembly; unsuitable for automated SMT lines or space-constrained boards. | Select SMBG5349B/TR13 for SMT production; choose 1N5349B only for prototyping or legacy repair. |
| SMBJ5349B | Same electrical specs and DO-214AA J-bend package - identical power rating and Zener characteristics. | DO-214AA has different pad layout and thermal profile; RθJA = 90 °C/W vs. SMBG's 25 °C/W junction-to-lead. | SMBG5349B/TR13 preferred where board-level heat sinking to leads is critical; SMBJ5349B acceptable if ambient cooling suffices. |
Compared with 1N5349B and SMBJ5349B, SMBG5349B/TR13 uniquely combines JEDEC-equivalent Zener performance with DO-215AA gull-wing geometry optimized for visual solder inspection, superior junction-to-lead thermal transfer (25 °C/W), and seamless integration into high-volume SMT manufacturing flows.
Availability
SMBG5349B/TR13 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial sensor conditioning requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBG5349B/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 SMBG53xxB series was designed specifically for surface-mount voltage regulation and transient suppression in high-density, thermally demanding power systems - emphasizing JEDEC compatibility, process consistency, and extended temperature operation.
FAQ
What is the Zener voltage tolerance for SMBG5349B/TR13?
The "B" suffix in SMBG5349B/TR13 denotes ±5% Zener voltage tolerance. At 12 V nominal, this corresponds to a guaranteed breakdown voltage range of 11.4 V to 12.6 V when measured at 100 mA test current and 25 °C. This tolerance is verified per JEDEC test methods and applies across the full operating temperature range.
Does SMBG5349B/TR13 require dry packing before reflow soldering?
No, SMBG5349B/TR13 has IPC/JEDEC J-STD-020B moisture sensitivity level 1, meaning it may be stored and processed without dry packing or baking. The device uses void-free epoxy encapsulation and is rated for standard reflow profiles up to 260 °C for 10 seconds - eliminating moisture-related assembly risks.
What is the maximum surge current rating for SMBG5349B/TR13?
SMBG5349B/TR13 is rated for a non-repetitive peak surge current (IZSM) of 7.5 A, defined as a single 8.3 ms half-sine waveform. This rating is confirmed in the Electrical Characteristics table on page 3 of the Microsemi datasheet T4-LDS-0246-1 and reflects its capability to absorb transient energy without parametric shift or failure.
How does the DO-215AA package of SMBG5349B/TR13 differ from DO-214AA?
The DO-215AA package used by SMBG5349B/TR13 features gull-wing leads for visible solder joints and improved coplanarity, whereas DO-214AA (used by SMBJ5349B) uses J-bend leads. DO-215AA offers lower junction-to-lead thermal resistance (25 °C/W vs. 90 °C/W junction-to-ambient for DO-214AA), enabling more efficient heat transfer to PCB copper traces.
Is SMBG5349B/TR13 RoHS compliant?
Yes, SMBG5349B/TR13 is RoHS compliant, using annealed matte-tin plating per the "e3" designation implied by the TR13 tape-and-reel suffix and confirmed in the Features section of the Microsemi datasheet. It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits.
SMBG5349B/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:
- ±5%
- 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)
SMBG5349B/TR13 FAQ
1.How can I place an order for SMBG5349B/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG5349B/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 SMBG5349B/TR13 reliable?
The price and inventory of SMBG5349B/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG5349B/TR13 is usually 5 days.
3.What payment methods are accepted for SMBG5349B/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG5349B/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG5349B/TR13?
SMBG5349B/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG5349B/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 SMBG5349B/TR13?
For technical support, including SMBG5349B/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG5349B/TR13 requirements.
6.How does Aetrix verify that SMBG5349B/TR13 is sourced from the original manufacturer or authorized distributors?
All SMBG5349B/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 SMBG5349B/TR13 meets industry standards.
7.What is the process for return or replacement of SMBG5349B/TR13?
All SMBG5349B/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG5349B/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 SMBG5349B/TR13 part is unused and in its original packaging.
Return procedure for SMBG5349B/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG5349B/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
Diodes Incorporated
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