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Microchip Technology 1N5351A/TR12
- Part No.:
- 1N5351A/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5351A/TR12.pdf
- Description:
- DIODE ZENER 14V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,382
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Product details
Overview
1N5351A/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 14 V, ±10% tolerance (A suffix), 2.5 Ω maximum dynamic impedance at 100 mA test current, and 6.7 A maximum Zener current when adequately heat-sunk. It regulates voltage in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N5351A/TR12 datasheet, 1N5351A/TR12 pinout, 1N5351A/TR12 application, or 1N5351A/TR12 equivalent, key selection factors include its 14 V nominal Zener voltage, ±10% tolerance, 5 W steady-state power rating at 25°C lead temperature, low thermal resistance (25 °C/W junction-to-lead), and RoHS-compliant matte-tin plating.
Technical Context
This device operates as a voltage reference by maintaining a stable reverse-biased breakdown voltage across its cathode–anode terminals. Its regulation performance is defined at 100 mA test current (IZT), with voltage regulation (ΔVZ) specified as 0.25 V between 10% and 50% of IZM.
The 1N5351A/TR12 exhibits minimal voltage drift versus current due to low dynamic impedance and supports surge currents up to 6.7 A (8.3 ms half-sine). Its moisture sensitivity level is IPC/JEDEC Level 1, eliminating dry-pack requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14 V nominal, ±10% tolerance - defines stable regulation point for reference and clamping applications |
| Test Current (IZT) | 100 mA - operating point where VZ and dynamic impedance are specified |
| Dynamic Impedance (ZZ) | 2.5 Ω max at IZT - ensures tight voltage regulation under varying load current |
| Max Zener Current (IZM) | 6.7 A - maximum continuous reverse current achievable with adequate heat sinking at TL = 25°C |
| Power Dissipation | 5.0 W at 25°C lead temperature - sets thermal design baseline for PCB layout and heatsinking |
| Thermal Resistance | 25 °C/W junction-to-lead (3/8" lead length) - enables accurate junction temperature estimation in axial-mount designs |
| Reverse Leakage (IR) | 1.0 μA max at 10.1 V - confirms low standby power loss in high-impedance bias networks |
Pinout & Package
Package: Axial-leaded T-18 plastic case per JEDEC DO-204AL standard. Cathode identified by color band; banded end must be held positive relative to anode during operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; reference node in reverse-bias regulation | Connected to system ground or lower-potential rail in shunt regulator configurations |
| Cathode | Current exit terminal in forward bias; regulated output node in reverse bias | Connected to input voltage source via series resistor; delivers stable 14 V reference or clamping voltage |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized mechanical dimensions, marking, and reliability testing compliance for global sourcing |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and bake-out prior to assembly, reducing manufacturing cost and risk |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling without special ESD controls in production environments |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU with annealed matte-tin plating, no lead or hazardous substances |
| High surge current capability | Withstands 6.7 A non-recurrent 8.3 ms half-sine surges - suitable for transient overvoltage suppression |
Applications
| Industrial Power Supply Reference | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Provides precise 14 V reference for feedback loop in isolated DC-DC converter secondary-side regulation. IC Role / Device Role / Timing Role: Shunt voltage reference establishing stable setpoint for error amplifier input. Use Value: Maintains ±10% output regulation accuracy across line/load/temperature with 2.5 Ω dynamic impedance limiting error drift. | Use Scenario: Clamps transient spikes on 12 V automotive accessory rail during load dump events. IC Role / Device Role / Timing Role: Voltage clamp diverting excess energy to ground when rail exceeds 14 V threshold. Use Value: Absorbs 6.7 A surge current (8.3 ms) without failure, protecting downstream 12 V logic and sensors. |
| Programmable Current Source Bias | Temperature-Stable Sensor Excitation |
Use Scenario: Sets bias current for precision op-amp-based constant-current generator driving LED arrays. IC Role / Device Role / Timing Role: Stable voltage reference defining current-setting resistor voltage drop. Use Value: Delivers 14 V reference with <0.25 V regulation delta across 1–5 A load steps, ensuring current stability. | Use Scenario: Supplies excitation voltage to platinum RTD bridge in industrial temperature transmitters. IC Role / Device Role / Timing Role: Low-drift voltage source powering Wheatstone bridge with minimal self-heating. Use Value: Operates from –65°C to +150°C with predictable VZ drift, enabling <±0.1% sensor accuracy over full range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5351B/TR12 | ±5% tolerance (B suffix) vs. ±10% (A suffix); identical VZ, IZT, ZZ, and IZM | Higher precision required in feedback loops where tighter regulation tolerance improves system accuracy | Select 1N5351B/TR12 when reference stability demands <±5% VZ variation across lot and temperature |
| MMBZ5242B (SOT-23) | Surface-mount package; 500 mW rating; 12 V nominal VZ; ±5% tolerance | Space-constrained PCBs requiring automated placement and lower power dissipation | Choose MMBZ5242B only for low-power (<500 mW), high-density designs - not a direct replacement for 5 W axial mounting |
Compared with 1N5351B/TR12, the 1N5351A/TR12 trades tolerance precision for cost and availability in legacy through-hole systems; versus MMBZ5242B, it provides 10× higher power handling and axial-mount robustness but requires manual or wave soldering and larger board area.
Availability
1N5351A/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and programmable current sources requiring stable component supply and long-term obsolescence management.
Supply support for 1N5351A/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 timing solutions for aerospace, defense, and industrial markets.
The 1N53xxA/B series was designed for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and long-lifecycle manufacturability in axial-leaded form.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5351A/TR12?
The 1N5351A/TR12 has a nominal Zener voltage of 14 V with a ±10% tolerance, as indicated by the "A" suffix per Microsemi's documentation. This means the actual measured VZ falls between 12.6 V and 15.4 V at 100 mA test current and 25°C lead temperature. The tolerance directly impacts regulation accuracy in reference and clamping applications using the 1N5351A/TR12.
What is the maximum continuous Zener current for the 1N5351A/TR12?
The 1N5351A/TR12 supports a maximum Zener current (IZM) of 6.7 A when operated with leads held at 25°C (TL = 25°C), per its 5 W power rating and 14 V nominal VZ. This value assumes adequate heat sinking - derating applies above 25°C lead temperature, and the 1N5351A/TR12 must not exceed its thermal limits in sustained operation.
Does the 1N5351A/TR12 require dry packing before PCB assembly?
No, the 1N5351A/TR12 has a moisture sensitivity level (MSL) of Level 1 per IPC/JEDEC J-STD-020B, meaning it is not moisture-sensitive and does not require dry packing, baking, or special handling prior to reflow or wave soldering. This simplifies manufacturing logistics and reduces risk of popcorning during assembly of the 1N5351A/TR12.
What is the dynamic impedance of the 1N5351A/TR12 and why does it matter?
The 1N5351A/TR12 has a maximum dynamic impedance (ZZ) of 2.5 Ω at its 100 mA test current (IZT). This low value indicates minimal change in Zener voltage under varying load current - critical for maintaining regulation accuracy in shunt references and clamping circuits where the 1N5351A/TR12 is used.
How is polarity marked on the 1N5351A/TR12 and how must it be connected?
The 1N5351A/TR12 uses a cathode band to indicate polarity: the banded end is the cathode and must be connected to the higher-potential node (e.g., input rail or reference voltage source), while the unbanded end is the anode and connects to ground or lower potential. Reverse connection prevents regulation and risks forward conduction damage if current exceeds 1.2 V @ 1.0 A limit.
1N5351A/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:
- ±10%
- 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
1N5351A/TR12 FAQ
1.How can I place an order for 1N5351A/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5351A/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 1N5351A/TR12 reliable?
The price and inventory of 1N5351A/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5351A/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5351A/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5351A/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5351A/TR12?
1N5351A/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5351A/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 1N5351A/TR12?
For technical support, including 1N5351A/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5351A/TR12 requirements.
6.How does Aetrix verify that 1N5351A/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5351A/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 1N5351A/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5351A/TR12?
All 1N5351A/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5351A/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 1N5351A/TR12 part is unused and in its original packaging.
Return procedure for 1N5351A/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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