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Microchip Technology 1N5346E3/TR8
- Part No.:
- 1N5346E3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5346E3/TR8.pdf
- Description:
- DIODE ZENER 9.1V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:9,106
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Product details
Overview
1N5346E3/TR8 from Microsemi is a 5.0 W axial-leaded silicon Zener diode with a nominal regulation voltage of 9.1 V, ±5% tolerance (B-suffix equivalent), 2.0 Ω maximum dynamic impedance at 150 mA test current, and 520 Ω maximum knee impedance at 1.0 mA. It operates from −65 °C to +150 °C and is RoHS-compliant (e3 suffix), used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5346E3/TR8 datasheet, 1N5346E3/TR8 pinout, 1N5346E3/TR8 application, or 1N5346E3/TR8 equivalent, key selection criteria include Zener voltage stability under varying load currents, thermal resistance (25 °C/W junction-to-lead), surge current rating (9.2 A), voltage regulation (ΔVZ = 0.22 V), and compatibility with FR4 PCB mounting using 4 mm² copper pads.
Technical Context
This device functions as a two-terminal voltage regulator in reverse-biased mode, where the cathode band must be held positive relative to the anode. Its regulation performance is defined at 150 mA test current (IZT), with dynamic impedance measured via 1 kHz AC superimposed on DC bias.
The 1N5346E3/TR8 exhibits minimal voltage drift across temperature (−65 °C to +150 °C) and maintains stable regulation under transient surges up to 8.3 ms half-sine waveform, supported by low thermal resistance (25 °C/W) when leads are trimmed to 10 mm from body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% - precise reference point for feedback networks in regulated DC supplies. |
| Power Dissipation | 5.0 W at 25 °C lead temperature - requires heat sinking above 75 °C ambient per derating curve. |
| Test Current (IZT) | 150 mA - operating point where VZ and ZZ are specified; defines stable regulation zone. |
| Dynamic Impedance (ZZ) | 2.0 Ω max - low AC resistance ensures minimal output voltage variation under load transients. |
| Max Surge Current (IZSM) | 9.2 A peak (8.3 ms half-sine) - withstands short-duration line surges without degradation. |
| Voltage Regulation (ΔVZ) | 0.22 V - difference between VZ at 10% and 50% of IZM, indicating tight regulation linearity. |
| Thermal Resistance | 25 °C/W junction-to-lead (3/8″ lead length) - enables thermal design with discrete heatsinking. |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free UL94V-0 epoxy), cathode indicated by colored band. Leads are annealed matte-tin plated, solderable per MIL-STD-750 Method 2026. Weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias reference ground node | Connected to system ground or lower-potential rail; carries full Zener current during regulation. |
| Cathode | Regulated output node | Banded end; held at stable 9.1 V above anode; interfaces directly with error amplifier inputs or clamp circuits. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures standardized mechanical dimensions, marking, and reliability testing across manufacturers. |
| Moisture Sensitivity Level 1 | No dry pack required before PCB assembly - simplifies handling and reduces manufacturing cost. |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special ESD handling during board assembly or field service. |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU; uses lead-free matte-tin plating and halogen-free epoxy. |
| High surge current capability | Withstands 9.2 A transient surges - suitable for input-stage clamping in industrial power converters. |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback loop via optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Provides stable 9.1 V reference to TL431 or similar shunt regulator IC, setting precise output setpoint. Use Value: Enables ±1% output accuracy over line/load/temperature with minimal component count and no external trimming. | Use Scenario: Clamps transient overvoltage on 12 V DC bus in automotive body control module during load dump events. IC Role / Device Role / Timing Role: Acts as two-terminal crowbar element, conducting heavily when bus exceeds 9.1 V to divert surge energy to ground. Use Value: Limits peak voltage to ≤10.5 V (9.1 V + ΔVZ), protecting downstream 12 V-rated logic and drivers without active circuitry. |
| Programmable Voltage Reference | Industrial Sensor Excitation |
Use Scenario: Serves as fixed reference in 4–20 mA transmitter loop-powered sensor interface for pressure or temperature sensing. IC Role / Device Role / Timing Role: Supplies stable excitation voltage to bridge sensors or RTDs while maintaining loop compliance. Use Value: Delivers <10 ppm/°C drift and <0.22 V regulation error across −40 °C to +85 °C operating range. | Use Scenario: Provides excitation voltage for strain-gauge-based load cells in factory automation weighing systems. IC Role / Device Role / Timing Role: Functions as low-noise, low-drift analog reference source for instrumentation amplifier biasing. Use Value: Ensures <0.5% full-scale measurement error over temperature due to stable 9.1 V reference and low ZZ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5346B | Same 9.1 V, ±5%, 5 W rating, but non-RoHS (SnPb plating); no e3 suffix. | Not compliant with RoHS Directive 2011/65/EU; unsuitable for EU-market consumer or industrial products. | Select 1N5346B only for legacy repair or non-RoHS environments where tin-lead solder is used. |
| SMBJ5346B | Surface-mount SMB package; identical electrical specs but 85 °C/W junction-to-ambient (FR4). | Requires reflow-compatible layout; not interchangeable without PCB redesign due to footprint and thermal path differences. | Choose SMBJ5346B for space-constrained designs where axial leads are impractical and thermal management uses larger copper areas. |
Compared with 1N5346B and SMBJ5346B, the 1N5346E3/TR8 offers RoHS compliance and axial-lead flexibility for through-hole prototyping or high-reliability chassis-mounted power supplies, while maintaining identical regulation performance and surge robustness.
Availability
1N5346E3/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and programmable voltage references requiring stable component supply and long-term manufacturability.
Supply support for 1N5346E3/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 1N53xx series was designed for ruggedized voltage regulation in harsh-environment power systems, emphasizing surge immunity, wide temperature operation, and JEDEC-standardized mechanical reliability.
FAQ
What is the Zener voltage tolerance of the 1N5346E3/TR8?
The 1N5346E3/TR8 has a nominal Zener voltage of 9.1 V with ±5% tolerance, consistent with the B-suffix designation in the 1N5333B–1N5388B family. This tolerance is verified at 25 °C lead temperature with 150 mA test current and defines the allowable deviation (8.65 V to 9.55 V) under standard operating conditions.
Can the 1N5346E3/TR8 be used in surface-mount designs?
No - the 1N5346E3/TR8 is an axial-leaded T-18 package and is not compatible with surface-mount assembly. For SMT implementation, Microsemi offers the SMBJ5346B in SMB package with identical electrical specifications, though thermal performance differs (85 °C/W vs. 25 °C/W).
What is the maximum steady-state power dissipation of the 1N5346E3/TR8 on a standard FR4 PCB?
When mounted on FR4 with 1 oz copper, 4 mm² pads, and 1 mm × 25 mm trace, the 1N5346E3/TR8 delivers 1.47 W steady-state power at 25 °C ambient. Derating begins above 25 °C per Figure 1 in the datasheet, reaching zero at ~115 °C ambient.
Does the 1N5346E3/TR8 require dry packing before reflow soldering?
No - the 1N5346E3/TR8 has IPC/JEDEC J-STD-020B Moisture Sensitivity Level 1, meaning it is not moisture-sensitive and does not require dry packing or baking prior to soldering, even at 260 °C for 10 seconds.
How is polarity marked on the 1N5346E3/TR8?
The cathode of the 1N5346E3/TR8 is marked by a distinct colored band on the body. During operation, the banded end must be held positive with respect to the unmarked (anode) end to achieve Zener breakdown and regulation.
1N5346E3/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:
- ±20%
- 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
1N5346E3/TR8 FAQ
1.How can I place an order for 1N5346E3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5346E3/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 1N5346E3/TR8 reliable?
The price and inventory of 1N5346E3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5346E3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5346E3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5346E3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5346E3/TR8?
1N5346E3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5346E3/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 1N5346E3/TR8?
For technical support, including 1N5346E3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5346E3/TR8 requirements.
6.How does Aetrix verify that 1N5346E3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5346E3/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 1N5346E3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5346E3/TR8?
All 1N5346E3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5346E3/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 1N5346E3/TR8 part is unused and in its original packaging.
Return procedure for 1N5346E3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5346E3/TR8 Tags
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