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Microchip Technology 1N5346C/TR12
- Part No.:
- 1N5346C/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5346C/TR12.pdf
- Description:
- DIODE ZENER 9.1V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:8,238
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Product details
Overview
1N5346C/TR12 from Microsemi is a 9.1 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 150 mA maximum Zener current (IZM), exhibits 2.0 Ω dynamic impedance (ZZ) at 150 mA test current, and operates across –65°C to +150°C.
For engineers reviewing the 1N5346C/TR12 datasheet, 1N5346C/TR12 pinout, 1N5346C/TR12 application, or 1N5346C/TR12 equivalent, key selection criteria include tight ±2% voltage tolerance, low 2.0 Ω dynamic impedance at rated current, 5 W steady-state power capability with proper lead heatsinking, and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal shunt regulator, maintaining stable reverse-biased breakdown voltage across wide operating current (10–150 mA) and temperature ranges. Its low thermal resistance (25 °C/W junction-to-lead at 10 mm lead length) enables reliable 5 W dissipation when leads are adequately heat-sunk.
The 1N5346C/TR12 features a sharp knee characteristic (ZZK = 0.22 Ω @ 1.0 mA), minimal voltage regulation drift (ΔVZ = 0.22 V between 10% and 50% IZM), and withstands 520 A surge current (8.3 ms half-sine) - critical for transient suppression in industrial DC rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±2% - precise reference for feedback networks requiring <±0.18 V deviation at 25°C |
| Test Current (IZT) | 150 mA - defined operating point where VZ and ZZ are guaranteed |
| Dynamic Impedance (ZZ) | 2.0 Ω - low AC resistance ensures minimal output voltage variation under load transients |
| Max Regulator Current (IZM) | 520 mA - maximum continuous DC current before thermal runaway, calculated as P/VZM = 5 W / 9.282 V |
| Power Dissipation | 5.0 W at TL < 25°C (3/8″ lead length) - requires mechanical heatsinking via PCB copper or chassis mounting |
| Thermal Resistance | 25 °C/W junction-to-lead - enables direct thermal path from die to PCB trace or metal chassis |
| Reverse Leakage (IR) | 7.5 μA max @ 6.9 V - negligible error contribution in high-impedance bias networks |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case (Void-free UL94V-0 epoxy), cathode indicated by band; leads are annealed matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or common return; defines polarity for shunt regulation |
| Cathode | Regulated output node | Banded end; connected to voltage rail being stabilized; reverse-biased during regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables single-supply reference accuracy without post-calibration in 12 V rail monitors |
| Low 2.0 Ω dynamic impedance at 150 mA | Reduces output ripple by >90% compared to ±5% variants under 100 mA load steps |
| 520 A surge current rating (8.3 ms) | Withstands lightning-induced transients on 24 V industrial control inputs without external TVS |
| Moisture sensitivity Level 1 (J-STD-020B) | Eliminates dry-pack requirement and bake-out prior to reflow, reducing assembly cost |
| RoHS-compliant e3 marking | Meets EU Directive 2011/65/EU without exemption requests; suitable for medical and telecom end equipment |
Applications
| Industrial Power Supply Feedback | Overvoltage Clamp for 12 V Rail |
|---|---|
Use Scenario: Stabilizing output of isolated flyback converter using TL431 replacement in cost-sensitive designs. IC Role / Device Role / Timing Role: Shunt reference providing precise 9.1 V threshold to optocoupler feedback network. Use Value: ±2% tolerance eliminates need for trim-pot calibration; 2.0 Ω ZZ maintains <15 mV output deviation across 50–150 mA load range. | Use Scenario: Protecting microcontroller I/O pins against 12 V rail overshoot during hot-swap events. IC Role / Device Role / Timing Role: Passive clamp limiting voltage to 9.1 V + forward drop of series resistor. Use Value: 520 A surge rating absorbs 100 A/μs transients without degradation; 7.5 μA IR avoids loading 1 MΩ input divider. |
| Programmable Reference Generator | Temperature-Stable Bias Network |
Use Scenario: Generating adjustable reference for DAC output scaling in sensor signal conditioning. IC Role / Device Role / Timing Role: Precision Zener element in resistor-divider string feeding op-amp non-inverting input. Use Value: Low ΔVZ (0.22 V) ensures <0.5% reference drift from 10% to 50% IZM; 25 °C/W thermal resistance minimizes self-heating error. | Use Scenario: Setting bias current for low-noise JFET amplifier stages in audio front-ends. IC Role / Device Role / Timing Role: Stable voltage source defining gate-source offset in discrete analog circuitry. Use Value: –65°C to +150°C operating range supports automotive under-hood deployment; 0.22 Ω ZZK @ 1 mA enables stable startup at cold temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5346B/TR12 | ±5% tolerance (vs. ±2%), same VZ nominal, identical package and IZM | Acceptable where system-level calibration compensates for initial tolerance | Select when cost sensitivity outweighs need for factory-trimmed reference accuracy |
| MMSZ5240B-TP | Surface-mount SOD-123, 500 mW rating, ±5%, 10 V nominal, 17 Ω ZZ | Limited to low-power logic-level clamping; unsuitable for 5 W dissipation | Choose only for space-constrained PCBs where thermal budget <0.5 W and ±5% tolerance is acceptable |
Compared with 1N5346B/TR12 and MMSZ5240B-TP, the 1N5346C/TR12 uniquely delivers ±2% tolerance at full 5 W power handling in an axial-leaded package - enabling high-reliability, uncalibrated references in industrial power systems without layout redesign or thermal derating.
Availability
1N5346C/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, programmable reference generators, and temperature-stable bias networks requiring stable component supply and long-term obsolescence management.
Supply support for 1N5346C/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 voltage regulation in harsh-environment power systems - emphasizing thermal robustness, surge immunity, and long-term parametric stability over commercial-grade alternatives.
FAQ
What is the Zener voltage tolerance of the 1N5346C/TR12?
The 1N5346C/TR12 has a Zener voltage tolerance of ±2%, as indicated by the "C" suffix per Microsemi's documentation. This means its measured breakdown voltage at 150 mA and 25°C falls within 8.92 V to 9.28 V. This tighter tolerance enables use in applications where post-manufacturing calibration is impractical, such as field-deployed industrial controllers. The 1N5346C/TR12 achieves this specification without requiring external trimming components.
How much power can the 1N5346C/TR12 dissipate continuously?
The 1N5346C/TR12 is rated for 5.0 W steady-state power dissipation when the lead temperature (TL) is maintained below 25°C - typically achieved with ≥10 mm lead length extending from the epoxy body and attached to a heatsink or large copper pour. On standard FR4 with 4 mm² pads, its derated power drops to 1.47 W at 25°C ambient. The 1N5346C/TR12 must be mounted with attention to thermal path integrity to avoid exceeding junction temperature limits.
What is the maximum surge current rating for the 1N5346C/TR12?
The 1N5346C/TR12 is rated for a maximum non-recurrent surge current (IZSM) of 520 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating reflects its ability to absorb transient energy without failure - critical for protecting downstream circuitry from inductive switching spikes or ESD events. The 1N5346C/TR12 maintains this capability across its full operating temperature range, unlike many lower-power Zeners that degrade surge performance at elevated temperatures.
Does the 1N5346C/TR12 require dry packing or baking before reflow soldering?
No, the 1N5346C/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, vacuum sealing, or pre-reflow baking. Its void-free thermosetting epoxy body inherently prevents moisture ingress. This simplifies manufacturing logistics and eliminates yield loss associated with moisture-related popcorning during reflow - a key advantage of the 1N5346C/TR12 in high-volume production environments.
What does the "TR12" suffix indicate in 1N5346C/TR12?
"TR12" indicates tape-and-reel packaging per EIA-296 standard, with 12,000 units per reel. This format is optimized for automated pick-and-place assembly and ensures consistent orientation (cathode band facing up) during placement. The 1N5346C/TR12 reel meets industry-standard carrier tape dimensions and cover tape peel strength requirements, supporting high-throughput SMT lines without manual handling or orientation verification.
1N5346C/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):
- 9.1 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 6.6 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
1N5346C/TR12 FAQ
1.How can I place an order for 1N5346C/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5346C/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 1N5346C/TR12 reliable?
The price and inventory of 1N5346C/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5346C/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5346C/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5346C/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5346C/TR12?
1N5346C/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5346C/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 1N5346C/TR12?
For technical support, including 1N5346C/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5346C/TR12 requirements.
6.How does Aetrix verify that 1N5346C/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5346C/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 1N5346C/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5346C/TR12?
All 1N5346C/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5346C/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 1N5346C/TR12 part is unused and in its original packaging.
Return procedure for 1N5346C/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5346C/TR12 Tags
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