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Microchip Technology 1N5345E3/TR8
- Part No.:
- 1N5345E3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5345E3/TR8.pdf
- Description:
- DIODE ZENER 8.7V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,555
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Product details
Overview
1N5345E3/TR8 from Microsemi is a silicon 5 W axial-leaded Zener diode with nominal regulation voltage of 8.7 V, ±5% tolerance (B-suffix equivalent), 150 mA maximum Zener current (IZM), 2.0 Ω maximum dynamic impedance (ZZ), and 10 μA maximum reverse leakage at 6.25 V. It operates from –65°C to +150°C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5345E3/TR8 datasheet, 1N5345E3/TR8 pinout, 1N5345E3/TR8 application, or 1N5345E3/TR8 equivalent, key selection criteria include Zener voltage stability under varying load/temperature, low dynamic impedance for tight regulation, RoHS-compliant matte-tin plating, and tape-and-reel packaging for automated assembly.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown mode. Its Zener voltage is specified at 150 mA test current (IZT), with voltage regulation (ΔVZ) of 0.20 V between 10% and 50% of IZM - indicating stable clamping across its rated current range.
Thermal design relies on junction-to-lead thermal resistance of 25 °C/W (at 3/8″ lead length), enabling 5 W dissipation at TL ≤ 25°C. When mounted on FR4 with 4 mm² copper pads, steady-state power drops to 1.47 W due to higher 85 °C/W junction-to-ambient resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V ±5% - precise DC reference for feedback networks in regulated power supplies. |
| Test Current (IZT) | 150 mA - operating point where VZ and ZZ are guaranteed; defines optimal regulation zone. |
| Dynamic Impedance (ZZ) | 2.0 Ω max - low AC resistance ensures minimal output voltage variation under dynamic load changes. |
| Max Reverse Leakage (IR) | 10 μA at 6.25 V - low leakage preserves efficiency in high-impedance bias/reference circuits. |
| Max Zener Current (IZM) | 150 mA - peak continuous DC current before thermal runaway; requires heatsinking above 25°C lead temp. |
| Power Dissipation | 5.0 W at TL = 25°C - defines absolute thermal limit; derates linearly to zero at TL = 150°C. |
| Operating Temp Range | –65°C to +150°C - supports industrial, automotive, and aerospace environments without derating. |
Pinout & Package
Package: Axial-leaded T-18 plastic case (JEDEC DO-201AD). Cathode identified by color band; banded end must be held positive relative to anode during regulation. Leads are annealed matte-tin plated per MIL-STD-750 Method 2026, RoHS compliant (e3 suffix), solderable at 260°C for 10 s.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; reverse-biased operation requires cathode > anode. |
| Cathode | Regulated output node | Banded terminal; provides stable 8.7 V when reverse current flows between 10–150 mA. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Guarantees mechanical and electrical interchangeability across qualified manufacturers. |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out prior to reflow. |
| ESD robustness | Nonsensitive per MIL-STD-750 Method 1020 - withstands handling without special precautions. |
| High surge current rating | 9.5 A peak (8.3 ms half-sine) - protects downstream circuitry from transient overvoltage events. |
| Low voltage regulation (ΔVZ) | 0.20 V - ensures <23 mV/V line regulation over 10–75 mA operating range. |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Provides stable 8.7 V reference for TL431 or similar shunt regulator IC. Use Value: Enables ±1% output accuracy across line/load/temperature with minimal external components. |
Use Scenario: Clamps rail voltage during load dump or inductive kickback in 12 V automotive systems. IC Role / Device Role / Timing Role: Two-terminal passive clamp absorbing up to 5 W continuously or 9.5 A surges. Use Value: Prevents MOSFET gate oxide rupture and IC latch-up without active control circuitry. |
| Industrial Sensor Biasing | Programmable Reference Source |
Use Scenario: Supplies stable excitation voltage to resistive temperature detectors (RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing higher-cost bandgap references. Use Value: Maintains <±0.5% reference stability over –40°C to +85°C ambient with 10 μA leakage. |
Use Scenario: Sets threshold in window comparators or adjustable voltage monitors via resistor divider. IC Role / Device Role / Timing Role: Programmable reference node with predictable knee characteristics and low ZZ. Use Value: Delivers repeatable trip points across production batches due to ±5% VZ tolerance and tight ΔVZ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5345B | Same VZ (8.7 V), ±5%, but non-RoHS tin-lead plating; no e3 suffix; TR8 tape-and-reel not standard. | Not suitable for RoHS-compliant manufacturing; requires lead-free process validation. | Select 1N5345B only if legacy tin-lead assembly is mandated and environmental compliance is waived. |
| SMBJ5345B | Surface-mount SMB package; identical electrical specs; 250 W peak pulse power vs. 5 W DC for 1N5345E3/TR8. | Designed for PCB space-constrained designs; lacks axial leads for through-hole prototyping or high-vibration mounting. | Choose SMBJ5345B when board area is limited and surge immunity > DC power handling is prioritized. |
Compared with 1N5345B and SMBJ5345B, the 1N5345E3/TR8 uniquely combines RoHS compliance, axial-leaded mechanical robustness, tape-and-reel automation readiness, and verified 5 W DC regulation - making it optimal for high-reliability through-hole power supply designs requiring long-term component continuity.
Availability
1N5345E3/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial sensor biasing requiring stable component supply, full RoHS compliance, and JEDEC-standard axial packaging.
Supply support for 1N5345E3/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xx series was engineered for ruggedized voltage regulation in mission-critical power systems - emphasizing thermal stability, surge resilience, and long-term parametric consistency under extreme environmental stress.
FAQ
What is the Zener voltage tolerance for 1N5345E3/TR8?
The 1N5345E3/TR8 has a ±5% Zener voltage tolerance, confirmed by its "B"-suffix equivalent designation in Microsemi's 1N5333B–1N5388B family documentation. This means the actual VZ falls between 8.265 V and 9.135 V at 150 mA test current and 25°C lead temperature - critical for designing feedback loop margins in regulated power supplies.
Can 1N5345E3/TR8 be used in surface-mount designs?
No - the 1N5345E3/TR8 uses axial-leaded T-18 (DO-201AD) packaging and is not compatible with SMT reflow processes. For surface-mount equivalents, Microsemi specifies SMBJ5345B (SMB package) or SMBG5345B (SMBG package), which share identical electrical parameters but require different PCB footprints and assembly methods.
What is the maximum continuous power dissipation for 1N5345E3/TR8?
The 1N5345E3/TR8 is rated for 5.0 W continuous power dissipation at a lead temperature (TL) of 25°C, measured 3/8″ from the body. Above 25°C, power must be linearly derated at 20 mW/°C until reaching zero at TL = 150°C - requiring thermal analysis of PCB copper area and airflow in final layout.
Does 1N5345E3/TR8 meet RoHS requirements?
Yes - the "e3" suffix in 1N5345E3/TR8 explicitly denotes RoHS compliance per EU Directive 2011/65/EU. Its leads feature annealed matte-tin plating (no lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE), verified per MIL-STD-750 Method 2026 and IPC/JEDEC J-STD-020B moisture classification Level 1.
How is polarity marked on 1N5345E3/TR8?
The 1N5345E3/TR8 uses a cathode band - a single colored ring near one end of the cylindrical body - to identify the cathode terminal. During regulation, the banded end must be held at a higher potential than the opposite (anode) end. Reversing polarity subjects the device to forward conduction only, with VF ≤ 1.2 V at 1.0 A.
1N5345E3/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):
- 8.7 V
- Tolerance:
- ±20%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 6.25 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
1N5345E3/TR8 FAQ
1.How can I place an order for 1N5345E3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5345E3/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 1N5345E3/TR8 reliable?
The price and inventory of 1N5345E3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5345E3/TR8 is usually 5 days.
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1N5345E3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5345E3/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 1N5345E3/TR8?
For technical support, including 1N5345E3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5345E3/TR8 requirements.
6.How does Aetrix verify that 1N5345E3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5345E3/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 1N5345E3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5345E3/TR8?
All 1N5345E3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5345E3/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 1N5345E3/TR8 part is unused and in its original packaging.
Return procedure for 1N5345E3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5345E3/TR8 Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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