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Microchip Technology 1N5345BE3/TR8
- Part No.:
- 1N5345BE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5345BE3/TR8.pdf
- Description:
- DIODE ZENER 8.7V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,054
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Product details
Overview
1N5345BE3/TR8 from Microsemi is a 5.0 W axial-leaded silicon Zener diode with nominal regulation voltage of 8.7 V, ±5% tolerance (B suffix), 150 mA test current (IZT), 2.0 Ω dynamic impedance (ZZ), and 545 mA maximum Zener current (IZM) at 25°C lead temperature. It operates from –65°C to +150°C and is used for precision voltage reference and overvoltage protection in industrial power supplies.
For engineers reviewing the 1N5345BE3/TR8 datasheet, 1N5345BE3/TR8 pinout, 1N5345BE3/TR8 application, or 1N5345BE3/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (9.5 A), voltage regulation (ΔVZ = 0.20 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-biased breakdown mode. Its Zener voltage is specified at 8.7 V ±5% under 150 mA DC test current, with low dynamic impedance (2.0 Ω) ensuring stable regulation across load variations.
Thermal design relies on junction-to-lead thermal resistance of 25 °C/W at 3/8″ (10 mm) lead length, enabling 5.0 W steady-state dissipation when adequately heat-sunk. It exhibits minimal voltage drift versus current (ΔVZ = 0.20 V between 10% and 50% IZM) and withstands 8.3 ms half-sine surge currents up to 9.5 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V ±5% - precise regulation point for 9 V rail clamping or reference generation |
| Test Current (IZT) | 150 mA - defined operating point for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 2.0 Ω - low AC resistance ensures minimal output voltage variation under dynamic load changes |
| Max Zener Current (IZM) | 545 mA - maximum continuous DC current at TL = 25°C with proper heatsinking |
| Voltage Regulation (ΔVZ) | 0.20 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
| Surge Current (IZSM) | 9.5 A - peak non-repetitive 8.3 ms half-sine current handling capability for transient suppression |
| Thermal Resistance (RθJL) | 25 °C/W - junction-to-lead resistance enables 5 W dissipation with modest heatsinking at lead |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC DO-204AL standard; void-free UL94V-0 epoxy body; cathode indicated by band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse bias applied to cathode for regulation |
| Cathode | Zener breakdown terminal / voltage regulation output | Banded end; connected to regulated voltage node; must be held positive relative to anode during operation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized mechanical dimensions, marking, and reliability testing compliance across manufacturers |
| Moisture sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out prior to assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Robust against electrostatic discharge during handling and PCB assembly without special precautions |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU with lead-free matte-tin plating and halogen-free epoxy |
| High surge current capability | Withstands 9.5 A 8.3 ms half-sine transients - suitable for input-stage overvoltage clamping |
Applications
| Industrial Power Supply Regulation | Automotive ECU Reference |
|---|---|
Use Scenario: Stabilizing 9 V auxiliary rail in programmable logic controller (PLC) power stage under variable load and temperature. IC Role / Device Role / Timing Role: Two-terminal shunt voltage regulator providing fixed reference for linear regulators and op-amp biasing. Use Value: Maintains ±0.20 V regulation across 54.5–272.5 mA load range (10–50% IZM), minimizing supply-induced signal errors. | Use Scenario: Generating stable 8.7 V reference for microcontroller ADC and sensor interface circuits in engine control units. IC Role / Device Role / Timing Role: Precision voltage reference source with low dynamic impedance for analog front-end stability. Use Value: Delivers <2 Ω impedance and <0.20 V ΔVZ, reducing ADC quantization error caused by supply ripple. |
| Overvoltage Protection Clamp | DC-DC Converter Feedback Divider |
Use Scenario: Clamping transient spikes on 12 V battery-fed circuits during load dump events in commercial vehicles. IC Role / Device Role / Timing Role: Shunt protector absorbing surge energy above 8.7 V while limiting downstream voltage excursion. Use Value: Sustains 9.5 A 8.3 ms surge current without failure, protecting downstream MOSFETs and ICs. | Use Scenario: Setting output voltage of isolated flyback converter via optocoupler feedback network. IC Role / Device Role / Timing Role: Primary-side Zener reference establishing precise feedback threshold for TL431-like control loop. Use Value: ±5% tolerance and low ZZ ensure <±0.5% output voltage drift over temperature and line variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5345BRLG | Same 8.7 V ±5%, 5 W rating, but in bulk packaging (no tape/reel); identical electrical specs and T-18 package | No TR8 tape-and-reel format - suited for manual prototyping or low-volume hand-soldered builds | Select 1N5345BRLG when reel packaging is unnecessary and cost-per-unit is prioritized over automated placement compatibility |
| MMBZ5236BS-7-F | Surface-mount SOD-123 package; 8.7 V ±5%, but only 0.35 W rating and 100 mA IZM - not power-equivalent | Limited to low-power signal-level regulation; cannot replace 1N5345BE3/TR8 in 5 W applications | Choose MMBZ5236BS-7-F only for space-constrained PCBs where thermal budget permits ≤350 mW dissipation |
Compared with 1N5345BRLG, the 1N5345BE3/TR8 offers tape-and-reel delivery for pick-and-place manufacturing, while MMBZ5236BS-7-F trades power capability for miniaturization - neither is pin-compatible due to axial vs. SMT form factor, and only the original supports full 5 W regulation with adequate heatsinking.
Availability
1N5345BE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECU reference circuits, and overvoltage protection systems requiring stable component supply and RoHS-compliant sourcing.
Supply support for 1N5345BE3/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 1N53xxB series was designed for robust, high-power voltage regulation in harsh environments - emphasizing wide temperature range (–65°C to +150°C), surge resilience, and JEDEC-standardized axial packaging for legacy and high-reliability systems.
FAQ
What is the Zener voltage tolerance of the 1N5345BE3/TR8?
The 1N5345BE3/TR8 has a Zener voltage tolerance of ±5%, indicated by the "B" suffix in its part number. This means its nominal 8.7 V regulation voltage falls within 8.265 V to 9.135 V at 150 mA test current and 25°C lead temperature, as confirmed in Microsemi's official 1N5333B–1N5388B datasheet Rev D.
Does the 1N5345BE3/TR8 require dry packing before reflow soldering?
No, the 1N5345BE3/TR8 does not require dry packing. It carries IPC/JEDEC J-STD-020B moisture sensitivity Level 1 classification, meaning it can be stored and processed indefinitely at ambient conditions without baking - a direct benefit of its void-free thermosetting epoxy encapsulation.
What is the maximum continuous power dissipation for the 1N5345BE3/TR8 on a standard FR4 PCB?
When mounted on a standard FR4 PCB (1 oz copper, 4 mm² pads, 1 mm track width, 25 mm length), the 1N5345BE3/TR8 has a steady-state power rating of 1.47 W at 25°C ambient temperature. This derates linearly above 25°C based on its 85°C/W junction-to-ambient thermal resistance.
Can the 1N5345BE3/TR8 be used as a direct replacement for the 1N5345B?
Yes, the 1N5345BE3/TR8 is functionally and mechanically identical to the 1N5345B, with added RoHS compliance (e3 suffix) and tape-and-reel packaging (TR8 suffix). Electrical parameters, T-18 package dimensions, and thermal characteristics match exactly - no circuit or layout changes are needed.
What is the forward voltage specification for the 1N5345BE3/TR8?
The forward voltage of the 1N5345BE3/TR8 is specified as a maximum of 1.2 V at 1.0 A forward current, per Microsemi's datasheet. This parameter applies only during forward conduction - the device is intended for reverse-bias Zener operation, not rectification.
1N5345BE3/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:
- ±5%
- 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
1N5345BE3/TR8 FAQ
1.How can I place an order for 1N5345BE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5345BE3/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 1N5345BE3/TR8 reliable?
The price and inventory of 1N5345BE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5345BE3/TR8 is usually 5 days.
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1N5345BE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5345BE3/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 1N5345BE3/TR8?
For technical support, including 1N5345BE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5345BE3/TR8 requirements.
6.How does Aetrix verify that 1N5345BE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5345BE3/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 1N5345BE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5345BE3/TR8?
All 1N5345BE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5345BE3/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 1N5345BE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5345BE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5345BE3/TR8 Tags
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MM5Z5V1ST1G
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