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Microchip Technology 1N5349C/TR8
- Part No.:
- 1N5349C/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5349C/TR8.pdf
- Description:
- DIODE ZENER 12V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,458
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Product details
Overview
1N5349C/TR8 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 and operates across –65°C to +150°C.
For engineers reviewing the 1N5349C/TR8 datasheet, 1N5349C/TR8 pinout, 1N5349C/TR8 application, or 1N5349C/TR8 equivalent, key selection criteria include its tight ±2% VZ tolerance, low 2.5 Ω ZZ at IZT, 750 mA maximum surge current rating, and T-18 axial package compatibility with manual or wave-solder assembly.
Technical Context
This Zener operates in reverse breakdown mode with cathode-banded polarity, requiring the banded end to be held positive relative to the anode. Its regulation performance is specified at 25°C lead temperature (TL), with thermal resistance of 25°C/W junction-to-lead at 10 mm lead length.
Voltage regulation (ΔVZ) is defined as the difference between voltages measured at 10% and 50% of IZM, yielding 0.25 V for 1N5349C/TR8. Dynamic impedance ZZ is measured at 1 kHz with 10% RMS AC current superimposed on DC IZT, confirming stable small-signal behavior under varying load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12.0 V ±2% - precise reference for feedback networks requiring <±240 mV total error budget |
| Test Current (IZT) | 100 mA - standard operating point for specification compliance and thermal stability validation |
| Dynamic Impedance (ZZ) | 2.5 Ω - ensures minimal output voltage shift under ±10 mA load transients in regulator applications |
| Max Surge Current (IZSM) | 750 mA (8.3 ms half-sine) - supports transient overvoltage clamping without failure |
| Power Dissipation (PD) | 5.0 W at TL = 25°C - requires ≥10 mm lead length from body for full rating; derates linearly above 25°C |
| Reverse Leakage (IR) | 2.0 μA @ 9.1 V - negligible current draw in high-impedance bias networks |
| Thermal Resistance (RθJL) | 25°C/W junction-to-lead - enables accurate junction temperature estimation using measured lead temperature |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC DO-41 outline; void-free UL94V-0 epoxy body; matte-tin plated leads solderable per MIL-STD-750 Method 2026; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Current sink in reverse bias | Connected to lower-potential node (e.g., ground or return path) during regulation |
| Cathode (banded end) | Regulated voltage output node | Provides stable 12 V reference when reverse biased; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Reduces need for post-assembly trimming in precision references and feedback paths |
| Moisture sensitivity Level 1 (IPC/JEDEC J-STD-020B) | Eliminates dry-pack requirement and bake-out prior to assembly, lowering manufacturing cost |
| RoHS-compliant (e3 suffix) | Meets global environmental compliance mandates without performance trade-offs |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling in standard workstations without special ESD controls |
| High surge current capability (750 mA) | Provides robust transient suppression in industrial power rails subject to load dump or inductive kick |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Precision 12 V reference source for TL431 or similar shunt regulator ICs. Use Value: ±2% VZ tolerance ensures output stays within ±1% of nominal over line/load/temperature, meeting Class II efficiency requirements. |
Use Scenario: Clamps 12 V rail against surges exceeding 15 V in automotive body control modules. IC Role / Device Role / Timing Role: Standby overvoltage clamp protecting downstream LDOs and microcontrollers. Use Value: 750 mA non-recurrent surge rating absorbs ISO 7637-2 Pulse 1/2a energy without degradation. |
| Programmable Reference Generator | Industrial Sensor Excitation |
Use Scenario: Forms adjustable reference with resistor divider in 4–20 mA transmitter calibration circuitry. IC Role / Device Role / Timing Role: Stable 12 V anchor for DAC-based reference scaling network. Use Value: 2.5 Ω ZZ minimizes divider ratio drift under varying DAC output impedance, improving calibration repeatability. |
Use Scenario: Supplies excitation voltage to 350 Ω strain gauge bridges in weigh scale load cells. IC Role / Device Role / Timing Role: Low-noise, thermally stable excitation source referenced to system ground. Use Value: –0.0005%/°C typical TCZ and 25°C/W RθJL enable <±0.05% FS error over –25°C to +70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5349B/TR8 | ±5% VZ tolerance (vs. ±2% for 1N5349C/TR8); identical VZ, IZT, ZZ, and package | Suitable where cost sensitivity outweighs precision; may require tighter external compensation | Select when ±5% regulation accuracy suffices and BOM cost reduction is prioritized |
| MMSZ5242ET1G | Surface-mount SOD-123 package; 12 V ±5%; 500 mW rating (vs. 5 W); ZZ = 30 Ω | Limited to low-power signal-level references; not suitable for power rail clamping or >10 mA loads | Choose only for space-constrained PCBs where power dissipation ≤0.5 W and ±5% tolerance acceptable |
Compared with 1N5349B/TR8 and MMSZ5242ET1G, the 1N5349C/TR8 uniquely combines ±2% tolerance, 5 W power handling, and axial T-18 packaging-enabling high-reliability, thermally robust regulation in industrial power supplies where precision and surge resilience are jointly required.
Availability
1N5349C/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and programmable reference generators requiring stable component supply with consistent parametric performance across production lots.
Supply support for 1N5349C/TR8 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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xxB/C series was designed specifically for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge immunity, and long-term parametric stability under extended temperature cycling.
FAQ
What is the Zener voltage tolerance of the 1N5349C/TR8?
The 1N5349C/TR8 has a Zener voltage tolerance of ±2%, as indicated by the "C" suffix per Microsemi's documentation. This means its nominal 12 V Zener voltage falls within 11.76 V to 12.24 V at 25°C lead temperature and 100 mA test current. The tolerance is guaranteed across the full operating temperature range and is tighter than the ±5% offered by the 1N5349B/TR8 variant.
Can the 1N5349C/TR8 be used in surface-mount designs?
No, the 1N5349C/TR8 uses a T-18 axial-leaded package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5349C series in DO-214AA (SMB) package, which shares the same 12 V ±2% specification but requires requalification for thermal and mechanical performance in board layout.
What is the maximum steady-state power dissipation for the 1N5349C/TR8 on a standard FR4 PCB?
When mounted on a standard FR4 PCB (1 oz copper, 4 mm² pads, 1 mm track width, 25 mm length), the 1N5349C/TR8 is rated for 1.47 W at 25°C ambient temperature. This derating reflects its higher thermal resistance to ambient (85°C/W) compared to junction-to-lead (25°C/W), and must be accounted for in thermal design to avoid exceeding 150°C junction temperature.
Does the 1N5349C/TR8 meet RoHS requirements?
Yes, the "e3" suffix in the full ordering code (1N5349C/TR8-e3) confirms RoHS compliance per EU Directive 2011/65/EU. The device uses annealed matte-tin plating on leads and halogen-free UL94V-0 epoxy encapsulation, with no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE substances above threshold limits.
How is polarity identified on the 1N5349C/TR8?
Polarity is marked by a single color band on the cathode end of the 1N5349C/TR8. During operation, the banded (cathode) terminal must be held at a more positive potential than the unbanded (anode) terminal to achieve Zener breakdown and regulation. Reversing polarity subjects the device to forward conduction with VF ≤1.2 V at 1.0 A, not regulation.
1N5349C/TR8 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/TR8 FAQ
1.How can I place an order for 1N5349C/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5349C/TR8 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/TR8 reliable?
The price and inventory of 1N5349C/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5349C/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5349C/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5349C/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5349C/TR8?
1N5349C/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5349C/TR8 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/TR8?
For technical support, including 1N5349C/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5349C/TR8 requirements.
6.How does Aetrix verify that 1N5349C/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5349C/TR8 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/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5349C/TR8?
All 1N5349C/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5349C/TR8, 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/TR8 part is unused and in its original packaging.
Return procedure for 1N5349C/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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