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Microchip Technology 1N5349C/TR12
- Part No.:
- 1N5349C/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5349C/TR12.pdf
- Description:
- DIODE ZENER 12V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:8,791
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Product details
Overview
1N5349C/TR12 from Microsemi is a 12 V, ±2% tolerance, 5 W axial-leaded silicon Zener diode optimized for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation. It delivers stable regulation at 100 mA test current with 2.5 Ω dynamic impedance, operates from –65°C to +150°C, and features moisture sensitivity Level 1 per J-STD-020B.
For engineers reviewing the 1N5349C/TR12 datasheet, 1N5349C/TR12 pinout, 1N5349C/TR12 application, or 1N5349C/TR12 equivalent, key selection criteria include its tight ±2% VZ tolerance, low 2.5 Ω ZZ at IZT, high IZM of 750 mA (with adequate heatsinking), and RoHS-compliant matte-tin plating compatible with 260°C/10s soldering.
Technical Context
The 1N5349C/TR12 functions as a two-terminal shunt regulator, maintaining a stable 12 V reverse breakdown voltage across its cathode–anode terminals under controlled DC bias. Its low thermal resistance (25 °C/W junction-to-lead at 10 mm lead length) enables reliable operation at full 5 W dissipation when leads are properly heat-sunk.
It exhibits minimal voltage drift versus current-ΔVZ = 0.25 V between 10% and 50% of IZM-and withstands non-repetitive 8.3 ms half-sine surge currents up to 7.5 A. Polarity is marked by a cathode band; operation requires the banded end to be positive relative to the anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12.0 V ±2% at 100 mA - ensures precise reference accuracy for feedback and clamping circuits |
| Power Dissipation (PD) | 5.0 W at TL = 25°C - supports robust regulation in linear regulators and protection stages |
| Dynamic Impedance (ZZ) | 2.5 Ω max at 100 mA - minimizes output voltage variation under load transients |
| Max Regulator Current (IZM) | 750 mA - defines maximum continuous DC current before thermal derating applies |
| Reverse Leakage (IR) | 2.0 μA max at 9.1 V - guarantees low standby power loss in high-impedance bias networks |
| Surge Current (IZSM) | 7.5 A peak (8.3 ms half-sine) - provides transient overvoltage resilience without failure |
| Operating Temperature | –65°C to +150°C - suitable for automotive under-hood, industrial control, and aerospace environments |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), 0.7 g weight, cathode indicated by single black band. Leads are annealed matte-tin plated per MIL-STD-750 Method 2026, solderable at 260°C for 10 s.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink terminal during Zener conduction | Connected to lower-potential node (e.g., ground or return path); must be negative relative to cathode |
| Cathode | Current source terminal during Zener conduction | Banded end; connected to regulated node or voltage reference point; must be positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables tighter output regulation than ±5% (B) or ±10% (A) variants, reducing need for post-regulation trimming |
| Moisture Sensitivity Level 1 | No dry pack or baking required prior to assembly-reduces manufacturing overhead and handling risk |
| Low ZZ and ΔVZ | 2.5 Ω ZZ and 0.25 V ΔVZ ensure stable reference under varying load conditions in feedback networks |
| High surge current rating | 7.5 A non-repetitive surge capability protects downstream circuitry against ESD and line transients |
| RoHS-compliant (e3 suffix) | Meets global environmental compliance requirements without performance trade-offs |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in optocoupler-based feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 12 V setpoint to error amplifier input. Use Value: ±2% VZ tolerance and low ΔVZ directly improve output voltage accuracy and load regulation (<±1.5%). |
Use Scenario: Placed across sensitive IC supply rail (e.g., microcontroller VDD) to clamp transient overvoltages. IC Role / Device Role / Timing Role: Fast-acting shunt clamp activated above 12.24 V (VZ + 2%) to divert excess current. Use Value: 7.5 A surge rating absorbs 8.3 ms transients without degradation, preserving system reliability. |
| Programmable Reference Voltage Source | Industrial Sensor Excitation |
Use Scenario: Paired with series resistor to generate stable 12 V reference for ADC voltage references or DAC biasing. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage source replacing higher-cost bandgap references where ±2% is sufficient. Use Value: 2.5 Ω ZZ and <2.0 μA leakage minimize loading error and enable high-impedance divider designs. |
Use Scenario: Supplies excitation voltage to resistive temperature detectors (RTDs) or strain gauges in PLC analog input modules. IC Role / Device Role / Timing Role: Stable, low-noise 12 V bias source tolerant of wide ambient temperature swings. Use Value: Operation from –65°C to +150°C ensures consistent sensor scaling across industrial operating ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5349B/TR12 | Same 12 V nominal VZ, but ±5% tolerance and higher ZZ (2.5 Ω vs. same value, but B-grade testing allows wider spec spread) | Suitable for less critical regulation where cost is prioritized over precision | Select 1N5349B/TR12 only if ±5% tolerance meets system accuracy requirements and lower cost justifies reduced consistency. |
| MMBZ5242B (SOT-23) | Surface-mount, 12 V ±5%, 0.5 W rating, 30 Ω ZZ - not pin-compatible and limited to low-power biasing | Used in space-constrained PCBs where axial leads are unacceptable and power <500 mW suffices | Choose MMBZ5242B only for compact, low-current applications; it cannot replace 1N5349C/TR12 in 5 W roles or high-surge environments. |
Compared with 1N5349B/TR12, the 1N5349C/TR12 offers tighter tolerance for improved system-level accuracy; compared with MMBZ5242B, it delivers 10× higher power handling and superior surge immunity-critical for industrial and power electronics use cases.
Availability
1N5349C/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and programmable logic controller (PLC) analog input circuits requiring stable component supply and long-term obsolescence management.
Supply support for 1N5349C/TR12 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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N53xxB/C/D series was designed specifically for ruggedized, high-stability voltage regulation in harsh-environment power systems-emphasizing thermal robustness, surge resilience, and long-term parametric consistency.
FAQ
What is the Zener voltage tolerance of the 1N5349C/TR12?
The 1N5349C/TR12 has a Zener voltage tolerance of ±2%, as indicated by the "C" suffix per Microsemi's documentation. This means its measured VZ at 100 mA falls within 11.76 V to 12.24 V at 25°C lead temperature. The tighter tolerance improves accuracy in feedback and reference applications compared to ±5% (B) or ±10% (A) variants.
Can the 1N5349C/TR12 be used without a heatsink?
The 1N5349C/TR12 can operate at up to 1.47 W continuously on a standard FR4 PCB (1 oz Cu, 4 mm² pads) without forced cooling, per its derating curve. Full 5 W dissipation requires mounting with 10 mm lead length and external heatsinking to maintain TL ≤ 25°C. Operating beyond derated limits risks thermal runaway and parametric shift.
What does the "TR12" suffix mean in 1N5349C/TR12?
The "TR12" suffix indicates tape-and-reel packaging per EIA-296 standard, with 12,000 units per reel. This format supports automated SMT placement despite the device's axial-leaded construction-enabling high-volume assembly while retaining the mechanical and thermal advantages of through-hole Zeners.
Is the 1N5349C/TR12 RoHS compliant?
Yes, the 1N5349C/TR12 is RoHS compliant, as confirmed by the "e3" designation in Microsemi's official documentation and product marking. Its matte-tin lead plating meets EU Directive 2011/65/EU requirements and is qualified for 260°C/10s soldering per J-STD-020.
How does the 1N5349C/TR12 handle transient overvoltage events?
The 1N5349C/TR12 is rated for a non-repetitive surge current (IZSM) of 7.5 A (8.3 ms half-sine wave), enabling it to safely clamp fast transients like ESD or inductive kickback. Its low ZZ and high IZM allow rapid energy dissipation without voltage overshoot exceeding 12.24 V, protecting downstream ICs in real-world power systems.
1N5349C/TR12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±2%
- 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:
- Through Hole
- Supplier Device Package:
- T-18
1N5349C/TR12 FAQ
1.How can I place an order for 1N5349C/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5349C/TR12 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 1N5349C/TR12 reliable?
The price and inventory of 1N5349C/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5349C/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5349C/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5349C/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5349C/TR12?
1N5349C/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5349C/TR12 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 1N5349C/TR12?
For technical support, including 1N5349C/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5349C/TR12 requirements.
6.How does Aetrix verify that 1N5349C/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5349C/TR12 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 1N5349C/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5349C/TR12?
All 1N5349C/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5349C/TR12, 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 1N5349C/TR12 part is unused and in its original packaging.
Return procedure for 1N5349C/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5349C/TR12 Tags
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