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Microchip Technology 1N5346CE3/TR8
- Part No.:
- 1N5346CE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5346CE3/TR8.pdf
- Description:
- DIODE ZENER 9.1V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,866
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Product details
Overview
1N5346CE3/TR8 from Microsemi is a silicon 5 W axial-leaded Zener diode with nominal regulation voltage of 9.1 V, ±2% tolerance (C suffix), 150 mA maximum Zener current (IZM), 2.0 Ω dynamic impedance (ZZ) at 150 mA test current, and operates from –65 °C to +150 °C - used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5346CE3/TR8 datasheet, 1N5346CE3/TR8 pinout, 1N5346CE3/TR8 application, or 1N5346CE3/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (520 A), voltage regulation (ΔVZ = 0.22 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown, with Zener voltage specified at 9.1 V ±2% under 150 mA DC test current (IZT). Its low dynamic impedance (2.0 Ω) ensures stable regulation across load variations, and its 25 °C/W junction-to-lead thermal resistance enables reliable 5 W dissipation with minimal lead-length heat sinking.
The 1N5346CE3/TR8 features cathode band polarity marking, UL94V-0 void-free epoxy encapsulation, and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity - eliminating dry-pack requirements. It withstands 8.3 ms half-sine surge currents up to 520 A and exhibits <0.22 V voltage regulation 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 regulation stability |
| Test Current (IZT) | 150 mA - defines operating point where VZ and ZZ are guaranteed |
| Dynamic Impedance (ZZ) | 2.0 Ω - low AC resistance minimizes output voltage variation under dynamic load changes |
| Max Regulator Current (IZM) | 520 mA - maximum continuous DC current before thermal runaway at TL = 25 °C |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables 5 W operation with 3/8″ (10 mm) lead length heat sinking |
| Voltage Regulation (ΔVZ) | 0.22 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
| Surge Current (IZSM) | 520 A - peak non-repetitive 8.3 ms half-sine current handling capability for transient suppression |
Pinout & Package
Package: Axial-leaded T-18 plastic case (JEDEC DO-204AL), void-free UL94V-0 epoxy body, tin-lead or RoHS-compliant matte-tin plated leads, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener breakdown terminal / voltage regulation output | Banded end; connected to regulated voltage node; must be held positive relative to anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables high-accuracy feedback without external trimming in 12 V rail monitors and reference supplies |
| 5 W steady-state power rating at TL < 25 °C | Supports robust overvoltage clamping in industrial DC-DC converters without forced cooling |
| Level 1 moisture sensitivity (J-STD-020B) | Eliminates baking and dry-pack requirements, reducing assembly cost and process risk |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Permits handling in standard production environments without special ESD controls |
| RoHS-compliant e3 suffix | Meets EU Directive 2011/65/EU and China RoHS II with matte-tin plating per MIL-STD-750 |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Precision Zener reference providing 9.1 V threshold to TL431 shunt regulator or directly biasing optocoupler LED. Use Value: ±2% tolerance ensures consistent regulation across temperature and line/load variations, reducing output drift to <±1.5%. | Use Scenario: Generating stable excitation voltage for bridge-based pressure transducers in factory automation systems. IC Role / Device Role / Timing Role: Low-drift voltage reference source powering Wheatstone bridge, replacing less stable IC references. Use Value: 0.22 V ΔVZ and 2.0 Ω ZZ maintain <0.3% reference error under 10–100 mA load swings, improving measurement repeatability. |
| Overvoltage Clamp Protection | Programmable Threshold Detector |
Use Scenario: Protecting microcontroller I/O pins from 12 V rail transients in automotive body control modules. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage to 9.1 V during load-dump events, diverting surge current away from sensitive logic. Use Value: 520 A 8.3 ms surge rating absorbs ISO 7637-2 Pulse 5a energy without degradation, extending system reliability. | Use Scenario: Setting trip point for battery undervoltage lockout in portable medical devices using discrete comparator circuits. IC Role / Device Role / Timing Role: Fixed 9.1 V reference input to LM393 comparator, triggering shutdown when battery drops below 9.3 V. Use Value: Tight ±2% tolerance ensures accurate 9.1 V threshold across –40 °C to +85 °C, preventing premature shutdown or delayed response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5346B | Same 9.1 V nominal VZ but ±5% tolerance (B suffix) vs. ±2% (C suffix); identical package, IZM, and thermal specs | Lower accuracy acceptable in non-critical biasing or coarse clamping where cost is prioritized over precision | Select 1N5346B when ±5% regulation suffices and BOM cost reduction is required |
| MMSZ5240ET1G | Surface-mount SOD-123 package; 100 mW rating; 9.1 V ±5%; 10 Ω ZZ; not rated for 5 W dissipation or 520 A surge | Only suitable for low-power signal-level referencing, not power rail regulation or surge clamping | Choose MMSZ5240ET1G only for space-constrained PCBs with <10 mA Zener current and no surge exposure |
Compared with 1N5346B and MMSZ5240ET1G, the 1N5346CE3/TR8 delivers superior voltage accuracy and power-handling capability - essential for industrial power supply feedback and transient protection where ±2% tolerance and 520 A surge immunity are design-critical.
Availability
1N5346CE3/TR8 is available at Aetrix Electronics and suitable for industrial power supply feedback, sensor reference circuits, overvoltage clamp protection, and programmable threshold detection requiring stable component supply and long-term lifecycle support.
Supply support for 1N5346CE3/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 1N53xxB series was designed specifically for ruggedized 5 W axial Zener regulation in harsh-environment power systems - emphasizing thermal robustness, surge resilience, and extended temperature operation.
FAQ
What is the Zener voltage tolerance of the 1N5346CE3/TR8?
The 1N5346CE3/TR8 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in the part number. This means its actual breakdown voltage falls within 8.918 V to 9.282 V at 150 mA test current and 25 °C lead temperature. This tighter tolerance supports precision applications such as feedback references where stability across temperature and aging is critical. The 1N5346CE3/TR8 achieves this specification without requiring external calibration.
Does the 1N5346CE3/TR8 require dry packing before PCB assembly?
No, the 1N5346CE3/TR8 does not require dry packing. It is rated IPC/JEDEC J-STD-020B Level 1 for moisture sensitivity, meaning it can be stored indefinitely at ambient conditions without desiccant or dry cabinet. This eliminates baking steps prior to reflow soldering and reduces manufacturing overhead. The 1N5346CE3/TR8's void-free UL94V-0 epoxy encapsulation contributes to its moisture resistance.
What is the maximum surge current rating for the 1N5346CE3/TR8?
The 1N5346CE3/TR8 is rated for a maximum non-repetitive surge current (IZSM) of 520 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating enables the 1N5346CE3/TR8 to absorb transient energy from load-dump events or inductive switching spikes in automotive and industrial power systems. Its ability to sustain this surge without parameter shift confirms robust construction and thermal design.
How does the thermal resistance of the 1N5346CE3/TR8 affect its power dissipation?
The 1N5346CE3/TR8 has a junction-to-lead thermal resistance (RθJL) of 25 °C/W when mounted with 3/8″ (10 mm) lead length from the body. At 25 °C lead temperature, this allows full 5 W dissipation. For every 1 °C rise in lead temperature above 25 °C, allowable power decreases linearly - e.g., at TL = 75 °C, max power drops to 3.75 W. Proper lead-length heat sinking is essential to maintain performance of the 1N5346CE3/TR8 in continuous operation.
Is the 1N5346CE3/TR8 compatible with lead-free reflow processes?
Yes, the 1N5346CE3/TR8 is RoHS-compliant (e3 suffix) and features annealed matte-tin plating qualified per MIL-STD-750 Method 2026. It supports lead-free reflow profiles with peak temperatures up to 260 °C for 10 seconds. The device's UL94V-0 epoxy body remains stable under these conditions, and its electrical parameters remain unchanged post-reflow - ensuring consistent behavior of the 1N5346CE3/TR8 in modern assembly lines.
1N5346CE3/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
1N5346CE3/TR8 FAQ
1.How can I place an order for 1N5346CE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5346CE3/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 1N5346CE3/TR8 reliable?
The price and inventory of 1N5346CE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5346CE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5346CE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5346CE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5346CE3/TR8?
1N5346CE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5346CE3/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 1N5346CE3/TR8?
For technical support, including 1N5346CE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5346CE3/TR8 requirements.
6.How does Aetrix verify that 1N5346CE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5346CE3/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 1N5346CE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5346CE3/TR8?
All 1N5346CE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5346CE3/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 1N5346CE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5346CE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5346CE3/TR8 Tags
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