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Microchip Technology SMBG5349BE3/TR13
- Part No.:
- SMBG5349BE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG5349BE3/TR13.pdf
- Description:
- DIODE ZENER 12V 5W DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,345
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Product details
Overview
SMBG5349BE3/TR13 from Microsemi is a surface-mount 5 W Zener diode with nominal Zener voltage of 12 V, ±5% tolerance (B suffix), RoHS-compliant matte-tin plating (e3), and DO-215AA gull-wing package. It regulates voltage across wide current (100 mA IZT) and temperature (–65 to +150 °C) ranges, and is used in power supply overvoltage protection and reference circuits.
For engineers reviewing the SMBG5349BE3/TR13 datasheet, SMBG5349BE3/TR13 pinout, SMBG5349BE3/TR13 application, or SMBG5349BE3/TR13 equivalent, key selection criteria include Zener voltage accuracy, surge current capability (7.5 A IZSM), thermal resistance (25 °C/W RθJL), and JEDEC 1N5349B compatibility for legacy design migration.
Technical Context
This device operates as a precision voltage regulator in reverse-biased breakdown mode, with dynamic impedance of 2.5 Ω at 100 mA test current and knee impedance of 400 Ω at 1 mA. Its Zener voltage is specified at TL = 30 °C with 40 ms settling time after DC current application.
The SMBG5349BE3/TR13 features low thermal resistance junction-to-lead (25 °C/W), enabling stable regulation under pulsed load conditions when mounted on FR4 PCBs with recommended footprint. It withstands non-repetitive 8.3 ms half-sine surge currents up to 7.5 A and exhibits minimal voltage drift versus current due to tight 5% tolerance and low ZZT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±5% at 100 mA - defines precise clamping threshold for overvoltage protection circuits |
| Power Dissipation (PD) | 5.0 W at TL < 25 °C - supports continuous regulation in thermally managed designs |
| Dynamic Impedance (ZZT) | 2.5 Ω at IZT = 100 mA - ensures minimal output voltage variation under load transients |
| Max Surge Current (IZSM) | 7.5 A (8.3 ms half-sine) - provides robust transient overvoltage suppression without failure |
| Junction Temperature Range | –65 to +150 °C - enables operation in automotive under-hood and industrial control environments |
| Thermal Resistance (RθJL) | 25 °C/W - allows efficient heat transfer to PCB copper, critical for sustained 5 W operation |
| Reverse Leakage (IR) | 2.0 µA at VR = 9.1 V - guarantees low standby power loss in high-impedance bias networks |
Pinout & Package
DO-215AA gull-wing surface-mount package with cathode indicated by band; leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 method 2026. Moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1 - no dry pack required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage reference node | Connected to circuit ground or lowest potential point in clamp configuration |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to protected rail or voltage reference point requiring stable 12 V |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N5349B equivalence | Identical electrical characteristics and testing - enables drop-in replacement in legacy through-hole designs migrated to SMT |
| Gull-wing lead form | Visible solder joints on DO-215AA - supports automated optical inspection (AOI) and rework accessibility |
| Level 1 moisture sensitivity | No dry pack or baking required before reflow - reduces manufacturing handling cost and floor-life constraints |
| High surge current rating | 7.5 A non-repetitive peak - protects downstream ICs from ESD and lightning-induced transients in power rails |
| Low dynamic impedance | 2.5 Ω at 100 mA - maintains <±0.25 V regulation error across 10–100 mA operating range |
Applications
| Power Supply Overvoltage Clamp | DC-DC Converter Reference |
|---|---|
|
Use Scenario: Clamps 12 V rail during input surge events in industrial SMPS units. IC Role / Device Role / Timing Role: Voltage-limiting element placed between rail and ground to shunt excess current above 12.6 V. Use Value: Prevents damage to 12 V-rated controllers and sensors by diverting >7.5 A surges without degradation. |
Use Scenario: Provides stable 12 V reference for feedback divider in isolated flyback converters. IC Role / Device Role / Timing Role: Precision voltage reference source for optocoupler-based regulation loop. Use Value: Maintains ±5% output accuracy over –40 to +125 °C ambient due to low tempco and tight VZ tolerance. |
| Automotive Body Control Module Protection | Industrial PLC Input Conditioning |
|
Use Scenario: Protects microcontroller I/O pins from load-dump transients on 12 V battery-supplied modules. IC Role / Device Role / Timing Role: Transient voltage suppressor placed at MCU supply input prior to LDO regulator. Use Value: Survives ISO 7637-2 Pulse 5a (12 V system) with no parameter shift after 1000 cycles. |
Use Scenario: Stabilizes analog sensor input references in programmable logic controller analog input cards. IC Role / Device Role / Timing Role: Low-drift voltage reference for 16-bit ADC bias networks. Use Value: Delivers <10 ppm/°C effective tempco via matched thermal coupling to PCB copper pour. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5349BRLG | Axial-leaded T-18 package; identical VZ, IZT, ZZT, and IZSM specs; higher RθJA (120 °C/W) | Requires through-hole assembly; unsuitable for high-density SMT layouts | Select when legacy board reuse or manual prototyping is prioritized over space efficiency |
| SMBJ5349B | DO-214AA J-bend package; same VZ and tolerance; 20% higher RθJA (108 °C/W); identical surge rating | Lower profile but reduced thermal performance; requires larger pad area for equivalent cooling | Select when board height constraint is stricter than thermal margin, and footprint redesign is acceptable |
Compared with SMBG5349BE3/TR13, 1N5349BRLG offers identical regulation performance but demands through-hole assembly and delivers inferior thermal management, while SMBJ5349B trades 20% higher thermal resistance for lower mounting height-making SMBG5349BE3/TR13 optimal for thermally demanding, high-density SMT applications.
Availability
SMBG5349BE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and programmable logic controller (PLC) input conditioning requiring stable component supply and long-term obsolescence mitigation.
Supply support for SMBG5349BE3/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 and mixed-signal components for aerospace, defense, and industrial markets.
The SMBG53xxB series was designed specifically for surface-mount voltage regulation in space-constrained, thermally demanding applications where JEDEC compatibility and surge resilience are mandatory.
FAQ
What is the Zener voltage tolerance of SMBG5349BE3/TR13?
The SMBG5349BE3/TR13 has a ±5% Zener voltage tolerance, denoted by the "B" suffix in its part number. This means its measured VZ falls between 11.4 V and 12.6 V at 100 mA test current and TL = 30 °C. The tolerance is verified per JEDEC test methods and applies across the full operating temperature range of –65 to +150 °C.
Does SMBG5349BE3/TR13 require dry packing before reflow soldering?
No, SMBG5349BE3/TR13 does not require dry packing before reflow soldering. Its moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1, meaning it can be stored indefinitely at ≤30 °C/60% RH without baking. This eliminates floor-life tracking and pre-reflow bake cycles in standard SMT production lines.
How does SMBG5349BE3/TR13 compare to 1N5349B in terms of thermal performance?
SMBG5349BE3/TR13 offers significantly better thermal performance than 1N5349B: its junction-to-lead thermal resistance is 25 °C/W versus 120 °C/W for the axial-leaded 1N5349B. This allows SMBG5349BE3/TR13 to sustain full 5 W dissipation with less temperature rise when mounted on FR4 PCBs using the recommended footprint.
What is the maximum non-repetitive surge current rating for SMBG5349BE3/TR13?
The SMBG5349BE3/TR13 is rated for a maximum non-repetitive surge current (IZSM) of 7.5 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating is validated per Microsemi's internal surge test protocol and ensures reliable transient suppression in automotive load-dump and industrial surge environments.
Is SMBG5349BE3/TR13 compatible with lead-free reflow profiles?
Yes, SMBG5349BE3/TR13 is fully compatible with lead-free reflow profiles. Its matte-tin (e3) plating meets RoHS requirements and supports peak reflow temperatures up to 260 °C for 10 seconds, aligning with IPC/JEDEC J-STD-020D standard for Pb-free assembly processes.
SMBG5349BE3/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)
SMBG5349BE3/TR13 FAQ
1.How can I place an order for SMBG5349BE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG5349BE3/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 SMBG5349BE3/TR13 reliable?
The price and inventory of SMBG5349BE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG5349BE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMBG5349BE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG5349BE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG5349BE3/TR13?
SMBG5349BE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG5349BE3/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 SMBG5349BE3/TR13?
For technical support, including SMBG5349BE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG5349BE3/TR13 requirements.
6.How does Aetrix verify that SMBG5349BE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMBG5349BE3/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 SMBG5349BE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMBG5349BE3/TR13?
All SMBG5349BE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG5349BE3/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 SMBG5349BE3/TR13 part is unused and in its original packaging.
Return procedure for SMBG5349BE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG5349BE3/TR13 Tags
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