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Microchip Technology 1N5346C/TR8
- Part No.:
- 1N5346C/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5346C/TR8.pdf
- Description:
- DIODE ZENER 9.1V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:8,640
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Product details
Overview
1N5346C/TR8 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 stable regulation at 150 mA test current with 2.0 Ω dynamic impedance and operates across –65°C to +150°C.
For engineers reviewing the 1N5346C/TR8 datasheet, 1N5346C/TR8 pinout, 1N5346C/TR8 application, or 1N5346C/TR8 equivalent, key selection criteria include its tight ±2% Zener voltage tolerance, low 2.0 Ω dynamic impedance at 150 mA, 5 W steady-state power rating at lead temperature <25°C, and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This Zener diode operates in reverse-bias breakdown mode, maintaining a stable 9.1 V reference across a wide current range (10–520 mA). Its low 2.0 Ω dynamic impedance ensures minimal voltage variation under load transients, while the 25 °C/W junction-to-lead thermal resistance enables reliable 5 W dissipation with standard 3/8″ lead length heat sinking.
The device features a void-free UL94V-0 epoxy case, cathode band polarity marking, and moisture sensitivity level 1 per J-STD-020B-eliminating dry-pack requirements. It withstands non-recurrent 8.3 ms half-sine surge currents up to 520 mA and exhibits ≤0.22 V voltage regulation (ΔVZ) between 10% and 50% of IZM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±2% - precise reference for feedback networks requiring tight output tolerance |
| Test Current (IZT) | 150 mA - operating point where VZ and ZZ are specified; supports stable regulation in mid-range loads |
| Dynamic Impedance (ZZ) | 2.0 Ω - low AC resistance minimizes output voltage ripple under varying load conditions |
| Max Regulator Current (IZM) | 520 mA - maximum continuous DC current at rated power, enabling robust overvoltage clamping |
| Power Dissipation (PD) | 5.0 W at TL < 25°C - high power handling with simple lead-length heat sinking |
| Voltage Regulation (ΔVZ) | 0.22 V - difference between VZ measured at 10% and 50% of IZM, indicating line regulation stability |
| Thermal Resistance (RθJL) | 25 °C/W - junction-to-lead resistance enables predictable thermal design with 3/8″ lead length |
| Reverse Leakage (IR) | 7.5 μA max @ 6.6 V - low leakage preserves accuracy in high-impedance bias/reference paths |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by color band. Leads are annealed matte-tin plated (RoHS-compliant) and solderable per MIL-STD-750 Method 2026. Weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; establishes reference potential for Zener operation |
| Cathode | Regulated output node | Banded end; supplies stable 9.1 V when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables tighter output regulation in SMPS feedback without external trimming |
| 5 W power rating with 25 °C/W RθJL | Supports high-energy transient suppression without heatsink in space-constrained layouts |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for SMT reflow compatibility |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-protected assembly zones |
| RoHS-compliant e3 marking | Meets global environmental compliance without derating or qualification retesting |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating 12 V output in isolated flyback converter using TL431 replacement topology. IC Role / Device Role / Timing Role: Primary-side voltage reference providing feedback to optocoupler input. Use Value: ±2% VZ tolerance directly improves output voltage accuracy to ±3% over line/load/temperature. | Use Scenario: Protecting 10 V analog front-end inputs from 24 V rail faults in industrial PLC modules. IC Role / Device Role / Timing Role: Shunt clamp absorbing transient energy above 9.1 V threshold. Use Value: 520 mA IZM and 5 W rating sustain 100 ms overvoltage events without degradation. |
| Precision Reference Generator | DC-DC Converter Bias Network |
Use Scenario: Generating stable 9.1 V reference for 16-bit DAC bias in medical sensor signal chain. IC Role / Device Role / Timing Role: Low-drift voltage source feeding high-impedance op-amp input. Use Value: 2.0 Ω ZZ and 0.22 V ΔVZ ensure reference stability within 0.3% across 1–100 mA load variation. | Use Scenario: Providing startup bias to controller IC in 48 V to 5 V buck converter. IC Role / Device Role / Timing Role: Pre-regulator supplying clean 9.1 V to IC VCC pin before main regulation engages. Use Value: 7.5 μA max IR at 6.6 V prevents excessive quiescent current in always-on bias path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5346B/TR8 | ±5% VZ tolerance, same 9.1 V nominal, identical package and IZM | Acceptable where system-level calibration compensates for wider voltage spread | Select when cost sensitivity outweighs need for ±2% regulation accuracy |
| MMBZ5240BS-7-F | Surface-mount SOD-123 package, 10 V ±5%, 0.5 W rating, 30 Ω ZZ | Not suitable for 5 W clamping; limited to low-power bias/reference roles | Choose only for space-constrained PCBs where power dissipation ≤0.5 W is sufficient |
Compared with 1N5346B/TR8 and MMBZ5240BS-7-F, the 1N5346C/TR8 uniquely combines ±2% tolerance, 5 W power handling, and axial-leaded through-hole mounting-making it the only option for high-accuracy, high-energy shunt regulation in legacy or ruggedized designs.
Availability
1N5346C/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and precision reference generators requiring stable component supply across automotive, industrial control, and medical equipment production cycles.
Supply support for 1N5346C/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xx series was designed specifically for ruggedized voltage regulation in harsh-environment power systems-emphasizing wide temperature operation, high surge immunity, and long-term parametric stability under thermal cycling.
FAQ
What is the Zener voltage tolerance of the 1N5346C/TR8?
The 1N5346C/TR8 has a Zener voltage tolerance of ±2%, as indicated by the "C" suffix in its part number. This means its actual breakdown voltage falls within 8.92 V to 9.28 V at 150 mA test current and 25°C lead temperature. This tighter tolerance compared to ±5% (B suffix) or ±10% (A suffix) variants makes the 1N5346C/TR8 suitable for applications demanding higher reference accuracy without post-manufacturing calibration.
Can the 1N5346C/TR8 be used in surface-mount designs?
No, the 1N5346C/TR8 is an axial-leaded through-hole device in the T-18 package and is not compatible with surface-mount assembly processes. For SMT equivalents, Microsemi offers the SMBJ5346B series in DO-214AA (SMB) package-but note these have ±5% tolerance and different thermal characteristics. The 1N5346C/TR8 requires wave soldering or hand-soldering with 3/8″ lead length for optimal 5 W power handling.
What is the maximum surge current rating for the 1N5346C/TR8?
The 1N5346C/TR8 is rated for a maximum non-recurrent surge current (IZSM) of 520 mA, defined as the peak value of an 8.3 ms half-sine waveform. This rating assumes proper PCB layout with adequate copper area for heat dissipation. Exceeding this surge current-even briefly-may cause irreversible junction damage, so transient protection circuits must limit peak energy to within this specification.
How does the 1N5346C/TR8 perform at elevated temperatures?
The 1N5346C/TR8 is rated for operation from –65°C to +150°C, with Zener voltage exhibiting a positive temperature coefficient above ~5 V. At +125°C, its VZ increases by approximately +0.07%/°C relative to 25°C, resulting in ~9.32 V nominal. Its 25 °C/W junction-to-lead thermal resistance remains valid up to 150°C, enabling predictable derating-e.g., 3.5 W max at TL = 80°C.
Is the 1N5346C/TR8 RoHS compliant?
Yes, the 1N5346C/TR8 carries the "e3" suffix per Microsemi documentation, confirming RoHS compliance with lead-free matte-tin plating on leads and halogen-free epoxy encapsulation. It meets EU Directive 2011/65/EU and is suitable for environmentally regulated markets without requiring exemptions. The "TR8" suffix denotes tape-and-reel packaging per EIA-296, which is also RoHS-aligned.
1N5346C/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):
- 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/TR8 FAQ
1.How can I place an order for 1N5346C/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5346C/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 1N5346C/TR8 reliable?
The price and inventory of 1N5346C/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5346C/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5346C/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5346C/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5346C/TR8?
1N5346C/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5346C/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 1N5346C/TR8?
For technical support, including 1N5346C/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5346C/TR8 requirements.
6.How does Aetrix verify that 1N5346C/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5346C/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 1N5346C/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5346C/TR8?
All 1N5346C/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5346C/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 1N5346C/TR8 part is unused and in its original packaging.
Return procedure for 1N5346C/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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