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Microchip Technology 1N5345BE3/TR12
- Part No.:
- 1N5345BE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5345BE3/TR12.pdf
- Description:
- DIODE ZENER 8.7V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,901
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Product details
Overview
1N5345BE3/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 8.7 V ±5%, 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 power supply feedback loops.
For engineers reviewing the 1N5345BE3/TR12 datasheet, 1N5345BE3/TR12 pinout, 1N5345BE3/TR12 application, or 1N5345BE3/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (200 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 breakdown. Its 8.7 V nominal Zener voltage is specified at 150 mA IZT with ±5% tolerance (B suffix), and its low 2.0 Ω dynamic impedance ensures stable regulation across load variations. The 25 °C/W junction-to-lead thermal resistance enables reliable 5 W dissipation with minimal heatsinking when leads are trimmed to 10 mm.
The 1N5345BE3/TR12 features a void-free UL94V-0 epoxy case, cathode band polarity marking, and 0.7 g mass. It withstands 260 °C soldering for 10 s and exhibits <10 μA reverse leakage at 6.25 V VR, meeting MIL-STD-750 ESD immunity requirements without external protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V ±5% - precise reference point for feedback networks in regulated DC-DC converters |
| Test Current (IZT) | 150 mA - operating point where VZ and ZZ are guaranteed per JEDEC registration |
| Dynamic Impedance (ZZ) | 2.0 Ω - low AC resistance minimizes output voltage variation under dynamic load changes |
| Max Zener Current (IZM) | 545 mA - maximum continuous DC current at TL = 25 °C with 10 mm lead length |
| Surge Current (IZSM) | 200 A - peak non-repetitive half-sine (8.3 ms) capability for transient overvoltage clamping |
| Voltage Regulation (ΔVZ) | 0.20 V - difference between VZ measured at 10% and 50% of IZM, indicating tight regulation linearity |
| Thermal Resistance (RθJL) | 25 °C/W - junction-to-lead resistance enables 5 W operation with simple lead heat sinking |
Pinout & Package
Package: Axial-leaded T-18 plastic case (JEDEC DO-201AD), void-free UL94V-0 epoxy body, cathode indicated by color band, matte-tin plated leads compliant with MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or common return path in shunt regulator configurations |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to input rail via series resistor and supplies stable 8.7 V to error amplifier inputs |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant e3 suffix | Matte-tin plating meets EU RoHS Directive 2011/65/EU and J-STD-609A Class 1 |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies SMT handling and storage |
| High surge current rating | 200 A peak (8.3 ms half-sine) enables robust transient suppression without derating |
| Tight voltage regulation | ΔVZ = 0.20 V ensures ≤23 mV deviation across 54.5–272.5 mA operating range |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - no additional ESD protection needed in board layout |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Provides stable 8.7 V reference to optocoupler input in isolated flyback converter feedback loop. IC Role / Device Role / Timing Role: Shunt voltage reference regulating secondary-side output voltage sensing. Use Value: Maintains ±1% output regulation across line/load transients due to low ΔVZ and 2.0 Ω ZZ. |
Use Scenario: Supplies excitation voltage to bridge-based pressure transducers in factory automation systems. IC Role / Device Role / Timing Role: Precision analog reference source for ratiometric sensor signal conditioning. Use Value: Delivers stable 8.7 V with <10 μA leakage at 6.25 V VR, minimizing offset drift in 24-bit ADC front-ends. |
| Overvoltage Clamp Circuit | Programmable Logic Controller Input Protection |
Use Scenario: Clamps 24 V DC bus surges in motor drive control circuits during inductive kickback events. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting rail voltage to safe levels. Use Value: Absorbs 200 A surge (8.3 ms) without degradation, protecting downstream MOSFET gate drivers. |
Use Scenario: Protects digital input pins on PLC modules against field-wiring induced transients. IC Role / Device Role / Timing Role: Primary-level overvoltage clamp on 24 V input channel. Use Value: Withstands repeated 1 kV EFT bursts per IEC 61000-4-4 due to low RθJL and high IZSM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5345B (non-e3, bulk) | Same electrical specs but SnPb-plated leads; not RoHS compliant | Restricted to legacy military/aerospace programs requiring Pb content | Select only if RoHS exemption applies and SnPb assembly process is used |
| SMBJ5345B | Surface-mount SMB package; same VZ/IZT/ZZ but higher RθJA (85 °C/W vs. 25 °C/W) | Requires PCB copper area for thermal management; unsuitable for through-hole prototyping | Choose for automated SMT production where board space is constrained |
Compared with 1N5345BE3/TR12, the 1N5345B lacks RoHS compliance and requires Pb-based soldering, while SMBJ5345B trades axial-mount flexibility and superior thermal performance for surface-mount compatibility-making 1N5345BE3/TR12 optimal for cost-sensitive industrial power designs needing lead-based heatsinking.
Availability
1N5345BE3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning, overvoltage protection circuits, and programmable logic controller input stages requiring stable component supply and long-term lifecycle support.
Supply support for 1N5345BE3/TR12 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 1N53xxB series was designed specifically for ruggedized 5 W voltage regulation in harsh-environment power systems where thermal stability, surge resilience, and long-term parametric consistency are critical.
FAQ
What is the Zener voltage tolerance of the 1N5345BE3/TR12?
The 1N5345BE3/TR12 has a Zener voltage tolerance of ±5%, as 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, per JEDEC-registered specifications.
Does the 1N5345BE3/TR12 require dry packing before PCB assembly?
No, the 1N5345BE3/TR12 has moisture sensitivity level 1 per IPC/JEDEC J-STD-020B, meaning it does not require dry packing or baking prior to reflow or wave soldering. Its void-free epoxy encapsulation prevents moisture ingress during standard handling and storage.
What is the maximum surge current rating for the 1N5345BE3/TR12?
The 1N5345BE3/TR12 is rated for a maximum non-repetitive surge current (IZSM) of 200 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating is validated under standardized test conditions and supports robust transient suppression in industrial power rails.
How does the thermal resistance of the 1N5345BE3/TR12 affect its power dissipation?
The 1N5345BE3/TR12 has a junction-to-lead thermal resistance (RθJL) of 25 °C/W at 10 mm lead length. At 25 °C ambient with adequate lead heatsinking, this allows full 5 W dissipation; without heatsinking, power must be derated per Figure 1 in the Microsemi datasheet to avoid exceeding 150 °C junction temperature.
Is the 1N5345BE3/TR12 compatible with lead-free soldering processes?
Yes, the 1N5345BE3/TR12 features RoHS-compliant matte-tin plating qualified for lead-free reflow soldering at 260 °C for up to 10 seconds. Its UL94V-0 epoxy body remains stable under these conditions, and no special pre-bake or flux requirements apply beyond standard J-STD-001 guidelines.
1N5345BE3/TR12 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/TR12 FAQ
1.How can I place an order for 1N5345BE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5345BE3/TR12 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/TR12 reliable?
The price and inventory of 1N5345BE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5345BE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5345BE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5345BE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5345BE3/TR12?
1N5345BE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5345BE3/TR12 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/TR12?
For technical support, including 1N5345BE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5345BE3/TR12 requirements.
6.How does Aetrix verify that 1N5345BE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5345BE3/TR12 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/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5345BE3/TR12?
All 1N5345BE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5345BE3/TR12, 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/TR12 part is unused and in its original packaging.
Return procedure for 1N5345BE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5345BE3/TR12 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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SMAZ12-13-F
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