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Microchip Technology 1N5351/TR8
- Part No.:
- 1N5351/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5351/TR8.pdf
- Description:
- DIODE ZENER 14V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,897
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Product details
Overview
1N5351/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 14 V, ±5% tolerance (B suffix), 2.5 Ω maximum dynamic impedance at 100 mA test current, 1.0 μA maximum reverse leakage at 10.1 V, and 6.7 A maximum DC zener current when adequately heat-sunk. It serves as a precision voltage reference or shunt regulator in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the 1N5351/TR8 datasheet, 1N5351/TR8 pinout, 1N5351/TR8 application, or 1N5351/TR8 equivalent, key selection criteria include its 14 V regulation point, 5 W steady-state power rating at 25°C lead temperature, low 2.5 Ω dynamic impedance, tight ±5% tolerance, and RoHS-compliant e3 marking with TR8 tape-and-reel packaging.
Technical Context
This device operates as a shunt voltage regulator by maintaining a stable reverse-biased breakdown voltage across its terminals under varying load and line conditions. Its 25 °C/W junction-to-lead thermal resistance enables reliable 5 W dissipation with minimal lead-length heat sinking (3/8 inch from body).
The 1N5351/TR8 exhibits 0.25 V maximum voltage regulation (ΔVZ) between 10% and 50% of IZM, confirming stable regulation across its operating current range. Its 2.5 Ω dynamic impedance (ZZ) is measured at 1 kHz with 10% AC modulation superimposed on 100 mA DC test current (IZT), per JEDEC standard test methodology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14 V nominal, ±5% tolerance - defines precise regulation setpoint for feedback or clamping |
| Test Current (IZT) | 100 mA - standardized bias point for measuring VZ and dynamic impedance |
| Dynamic Impedance (ZZ) | 2.5 Ω max at 100 mA - low AC resistance ensures minimal output voltage variation under load transients |
| Max Reverse Leakage (IR) | 1.0 μA at 10.1 V - confirms sharp knee and low standby power loss below regulation threshold |
| Max Zener Current (IZM) | 6.7 A - maximum continuous DC current achievable with proper heat sinking at TL = 25°C |
| Power Dissipation | 5.0 W at TL = 25°C (3/8″ lead length) - defines thermal design baseline for PCB layout and heatsinking |
| Voltage Regulation (ΔVZ) | 0.25 V max - difference between VZ measured at 10% and 50% of IZM, indicating regulation stability |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC TO-204AA, void-free thermosetting epoxy meeting UL94V-0, with cathode band marking and tin-lead or RoHS-compliant matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage reference node | Connected to circuit ground or lower-potential rail in shunt regulator configuration |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to input rail or feedback node-maintains 14 V relative to anode when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 5 W Zener | Industry-standard reliability and interchangeability in legacy and industrial designs |
| ±5% voltage tolerance (B suffix) | Enables tighter regulation than ±10% or ±20% variants without requiring custom trimming |
| Moisture sensitivity Level 1 | No dry pack required-simplifies handling, storage, and assembly logistics |
| RoHS-compliant (e3 suffix) | Meets environmental compliance requirements for commercial and industrial end equipment |
| Tape-and-reel packaging (TR8) | Standard EIA-296 format supporting automated SMT placement despite axial-leaded form factor |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback networks using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 14 V reference to TL431 or similar error amplifier input. Use Value: Enables accurate ±1–2% output regulation across line/load/temperature with minimal external components. |
Use Scenario: Clamps transient surges on 12 V automotive or industrial control bus lines during load dump or inductive switching events. IC Role / Device Role / Timing Role: Passive shunt clamp absorbing energy above 14 V threshold to protect downstream logic and analog ICs. Use Value: Withstands 6.7 A DC and high-energy 8.3 ms half-sine surges up to 14.4 A peak without degradation. |
| Programmable Voltage Reference | DC-DC Converter Output Trim |
Use Scenario: Provides stable 14 V reference for DAC-based programmable power supplies or calibration circuits in test equipment. IC Role / Device Role / Timing Role: Precision shunt reference replacing higher-cost bandgap references where ±5% accuracy suffices. Use Value: Low 2.5 Ω dynamic impedance minimizes output drift under varying reference current draw. |
Use Scenario: Fine-tunes output voltage of adjustable DC-DC converters (e.g., LM2596, MP2307) via feedback divider injection. IC Role / Device Role / Timing Role: Adjustable shunt element injecting controlled current into feedback node to offset reference voltage. Use Value: Enables ±0.5 V output adjustment range with predictable, linear current-voltage response at 100 mA IZT. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5351B | Same electrical specs but bulk (non-tape) packaging; no TR8 designation | Lacks EIA-296 tape-and-reel compatibility for automated assembly | Select 1N5351/TR8 for SMT line integration; choose 1N5351B for manual prototyping or low-volume hand soldering |
| MMSZ5241B-TP | Surface-mount SOD-123 package, 500 mW rating, same 14 V ±5%, but lower IZM (190 mA) | Not suitable for 5 W dissipation; limited to low-power bias/reference roles | Use MMSZ5241B-TP only in space-constrained, low-current applications where thermal mass is insufficient for axial-leaded devices |
Compared with 1N5351/TR8, 1N5351B offers identical regulation performance but requires manual handling, while MMSZ5241B-TP trades power capability for footprint reduction-making 1N5351/TR8 the sole choice for robust 5 W shunt regulation with automated assembly support.
Availability
1N5351/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, programmable voltage references, and DC-DC converter output trim applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for 1N5351/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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was engineered for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and JEDEC-standard interchangeability across military and commercial applications.
FAQ
What is the Zener voltage tolerance of the 1N5351/TR8?
The 1N5351/TR8 has a ±5% Zener voltage tolerance, indicated by the "B" suffix in its part number. This means its actual regulation voltage falls within 13.3 V to 14.7 V at 100 mA test current and 25°C lead temperature, per JEDEC-registered specifications in the Microsemi datasheet.
Can the 1N5351/TR8 be used in surface-mount designs?
The 1N5351/TR8 is an axial-leaded T-18 package and is not a surface-mount device. However, it is supplied in TR8 tape-and-reel format compliant with EIA-296, enabling automated pick-and-place insertion into through-hole pads-commonly used in hybrid SMT/through-hole manufacturing lines where mechanical robustness is prioritized.
What is the maximum continuous current the 1N5351/TR8 can handle?
The 1N5351/TR8 supports a maximum continuous Zener current (IZM) of 6.7 A when mounted with 3/8 inch (10 mm) lead length from the body at 25°C lead temperature. At ambient temperature on FR4 board, derating applies-steady-state power drops to 1.47 W, limiting usable current to approximately 105 mA without additional heatsinking.
Does the 1N5351/TR8 meet RoHS requirements?
Yes, the 1N5351/TR8 carries the "e3" suffix, certifying full RoHS compliance per EU Directive 2011/65/EU. Its terminations use annealed matte-tin plating instead of lead-based solder finishes, and its void-free epoxy body meets UL94V-0 flammability standards without halogenated flame retardants.
How does thermal resistance affect the 1N5351/TR8's power handling?
The 1N5351/TR8 has a junction-to-lead thermal resistance of 25°C/W. With 5 W dissipation, this yields a 125°C temperature rise above lead temperature-so maintaining TL ≤ 25°C is essential for full-rated operation. On FR4 boards, its junction-to-ambient resistance rises to 85°C/W, requiring strict layout controls (4 mm² copper pads, 1 mm trace width) to sustain even 1.47 W continuously.
1N5351/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):
- 14 V
- Tolerance:
- ±20%
- 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
1N5351/TR8 FAQ
1.How can I place an order for 1N5351/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5351/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 1N5351/TR8 reliable?
The price and inventory of 1N5351/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5351/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5351/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5351/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5351/TR8?
1N5351/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5351/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 1N5351/TR8?
For technical support, including 1N5351/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5351/TR8 requirements.
6.How does Aetrix verify that 1N5351/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5351/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 1N5351/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5351/TR8?
All 1N5351/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5351/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 1N5351/TR8 part is unused and in its original packaging.
Return procedure for 1N5351/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5351/TR8 Tags
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