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Microchip Technology 1N5351C/TR12
- Part No.:
- 1N5351C/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5351C/TR12.pdf
- Description:
- DIODE ZENER 14V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,339
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Product details
Overview
1N5351C/TR12 from Microsemi is a 5 W, 14 V ±2% tolerance 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 is RoHS-compliant (e3 suffix).
For engineers reviewing the 1N5351C/TR12 datasheet, 1N5351C/TR12 pinout, 1N5351C/TR12 application, or 1N5351C/TR12 equivalent, key selection criteria include its tight ±2% VZ tolerance, low 2.5 Ω Zener impedance at IZT, 340 mA maximum regulator current (IZM), and compatibility with standard T-18 axial package mounting on FR4 PCBs.
Technical Context
This device functions as a two-terminal shunt voltage regulator, maintaining a stable 14 V reverse breakdown across its cathode–anode terminals when biased above its knee current. Its regulation performance is defined by ΔVZ = 0.25 V (measured between 10% and 50% of IZM) and exhibits minimal voltage drift over temperature due to low thermal resistance (25 °C/W junction-to-lead).
The 1N5351C/TR12 uses a void-free thermosetting epoxy case (UL94V-0) with tin-lead or RoHS-compliant matte-tin plating, rated for 260 °C soldering (10 s max). 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) | 14.0 V ±2% at 100 mA - ensures precise reference accuracy for feedback networks requiring tight output tolerance. |
| Power Dissipation | 5.0 W at 25 °C lead temperature - supports robust regulation under sustained load with adequate heat sinking. |
| Dynamic Impedance (ZZ) | 2.5 Ω at 100 mA - minimizes output voltage variation under changing load currents. |
| Max Regulator Current (IZM) | 340 mA - defines maximum continuous DC current before thermal derating applies. |
| Reverse Leakage (IR) | 1.0 μA max at 10.1 V - guarantees low standby power loss in high-impedance bias networks. |
| Thermal Resistance | 25 °C/W junction-to-lead (3/8″ lead length) - enables predictable thermal design in chassis-mounted or heatsinked applications. |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC DO-41 outline; moisture sensitivity level 1 (no dry pack required); weight 0.7 g; cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher-potential rail; sinks current to maintain fixed 14 V drop across load. |
| Anode (unbanded end) | Reference return node | Connected to circuit ground or lower-potential reference point; completes shunt regulation path. |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables high-accuracy voltage references without external trimming in power supply feedback paths. |
| Low 2.5 Ω dynamic impedance | Reduces output voltage deviation under dynamic load transients in regulated DC supplies. |
| RoHS-compliant (e3 suffix) and MIL-PRF-19500 screening options | Supports compliance-critical industrial, aerospace, and defense designs with traceable material content. |
| 260 °C solderability and UL94V-0 epoxy case | Ensures reliable assembly in automated reflow and wave-solder processes without delamination or charring. |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in the optocoupler feedback loop of an isolated 12 V/5 A flyback converter to regulate output voltage within ±1%. IC Role / Device Role / Timing Role: Shunt voltage reference providing error signal to primary-side controller via optocoupler. Use Value: The 1N5351C/TR12's ±2% VZ and low ZZ directly improve output voltage accuracy and transient response versus looser-tolerance Zeners. |
Use Scenario: Placed across a 12 V automotive microcontroller's VDD rail to clamp transients exceeding 15 V during load dump events. IC Role / Device Role / Timing Role: Passive overvoltage clamp limiting rail voltage to protect downstream logic. Use Value: With 340 mA IZM and 20 A surge rating (8.3 ms), the 1N5351C/TR12 safely absorbs energy without failure during ISO 7637-2 pulse 5a events. |
| Programmable Voltage Reference | Current Source Bias Network |
Use Scenario: Paired with a precision op-amp in a two-resistor divider to generate a stable 14 V reference for ADC calibration in test equipment. IC Role / Device Role / Timing Role: Primary voltage reference element establishing absolute scale for analog measurements. Use Value: The 1N5351C/TR12's low ΔVZ (0.25 V) and minimal tempco ensure <0.05% full-scale drift over –40°C to +85°C operating range. |
Use Scenario: Biased in series with a 1 kΩ resistor from a 24 V supply to deliver a stable ~10 mA current to a photodiode amplifier stage. IC Role / Device Role / Timing Role: Constant-voltage element enabling predictable current setpoint via Ohm's law. Use Value: At 100 mA IZT, the 1N5351C/TR12 maintains 14.0 V ±0.28 V, yielding current stability better than ±3% across input voltage and temperature variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5351B/TR12 | ±5% VZ tolerance (vs. ±2% for 1N5351C/TR12); identical VZ, IZT, ZZ, and package. | Suitable where cost sensitivity outweighs need for tight regulation; may require additional system-level calibration. | Select 1N5351B/TR12 only if ±5% output tolerance is acceptable in final application. |
| MMBZ5241B (SOT-23) | Surface-mount, 0.5 W rating, ±5% VZ, 14 V nominal; ZZ = 17 Ω at 20 mA - higher impedance and lower power handling. | Limited to low-current bias/reference roles; not suitable for >100 mA regulation or surge clamping. | Choose MMBZ5241B only for space-constrained PCBs where power dissipation remains below 0.3 W. |
Compared with 1N5351B/TR12 and MMBZ5241B, the 1N5351C/TR12 provides superior voltage accuracy and higher power capability in an industry-standard axial package-making it optimal for mid-power feedback, clamping, and reference designs demanding ±2% stability and 5 W thermal margin.
Availability
1N5351C/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and programmable voltage reference designs requiring stable component supply and long-term obsolescence management.
Supply support for 1N5351C/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xxB/C series was designed specifically for ruggedized, high-stability voltage regulation in harsh-environment power systems-emphasizing wide temperature operation, surge resilience, and JEDEC-standardized mechanical reliability.
FAQ
What is the Zener voltage tolerance of the 1N5351C/TR12?
The 1N5351C/TR12 has a Zener voltage tolerance of ±2%, as indicated by the "C" suffix in its part number. This means its measured VZ falls within 13.72 V to 14.28 V at 100 mA test current and 25 °C lead temperature, per Microsemi's published electrical characteristics table.
What is the maximum continuous current the 1N5351C/TR12 can handle?
The 1N5351C/TR12 supports a maximum continuous Zener current (IZM) of 340 mA when operated at 25 °C lead temperature with adequate heat sinking. At ambient temperature on FR4 board, steady-state power drops to 1.47 W, limiting usable current to approximately 105 mA without derating.
Is the 1N5351C/TR12 RoHS compliant?
Yes, the 1N5351C/TR12 is RoHS compliant, confirmed by the "e3" suffix in its full manufacturer designation (1N5351C/TR12 e3). It uses RoHS-compliant annealed matte-tin plating on leads and meets UL94V-0 flammability requirements for its epoxy case.
How is polarity marked on the 1N5351C/TR12?
The 1N5351C/TR12 uses a cathode band to indicate polarity: the banded end is the cathode and must be connected to the higher-potential node in shunt regulation applications. The unbanded end is the anode and connects to the reference or ground node.
What is the thermal resistance specification for the 1N5351C/TR12?
The 1N5351C/TR12 has a junction-to-lead thermal resistance of 25 °C/W when measured at 3/8″ (10 mm) lead length from the body. When mounted on FR4 PCB (1 oz Cu, 4 mm² pads), junction-to-ambient thermal resistance is 85 °C/W - critical for calculating safe operating temperature under load.
1N5351C/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):
- 14 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2.5 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 10.1 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
1N5351C/TR12 FAQ
1.How can I place an order for 1N5351C/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5351C/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 1N5351C/TR12 reliable?
The price and inventory of 1N5351C/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5351C/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5351C/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5351C/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5351C/TR12?
1N5351C/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5351C/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 1N5351C/TR12?
For technical support, including 1N5351C/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5351C/TR12 requirements.
6.How does Aetrix verify that 1N5351C/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5351C/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 1N5351C/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5351C/TR12?
All 1N5351C/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5351C/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 1N5351C/TR12 part is unused and in its original packaging.
Return procedure for 1N5351C/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5351C/TR12 Tags
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MM5Z5V1ST1G
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