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Microchip Technology 1N5345AE3/TR12
- Part No.:
- 1N5345AE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5345AE3/TR12.pdf
- Description:
- DIODE ZENER 8.7V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,015
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Product details
Overview
1N5345AE3/TR12 from Microsemi is a silicon 5 W axial-leaded Zener diode with nominal regulation voltage of 8.7 V, ±10% tolerance (A suffix), 150 mA maximum Zener current (IZM), and 2.0 Ω dynamic impedance (ZZ) at 150 mA test current. 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 1N5345AE3/TR12 datasheet, 1N5345AE3/TR12 pinout, 1N5345AE3/TR12 application, or 1N5345AE3/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (545 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, maintaining stable output voltage across wide current (10–150 mA) and temperature (–65°C to +150°C) ranges. Its low dynamic impedance (2.0 Ω) and tight voltage regulation (ΔVZ = 0.20 V) ensure minimal output variation under load transients.
The 1N5345AE3/TR12 uses void-free thermosetting epoxy encapsulation (UL94V-0), features cathode band polarity marking, and is rated for 260°C/10 s soldering. Its thermal resistance of 25 °C/W (junction-to-lead, 10 mm lead length) enables high-current operation with minimal heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V ±10% - defines nominal regulation point for feedback and clamping circuits |
| Test Current (IZT) | 150 mA - standardized bias point for measuring VZ and dynamic impedance |
| Dynamic Impedance (ZZ) | 2.0 Ω - low AC resistance ensures stable voltage under varying load currents |
| Max Regulator Current (IZM) | 545 mA - maximum DC current at 25°C with adequate heat sinking (P = 5 W) |
| Surge Current (IZSM) | 545 A - peak non-repetitive half-sine (8.3 ms) capability for transient suppression |
| Voltage Regulation (ΔVZ) | 0.20 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
| Thermal Resistance (RθJL) | 25 °C/W - junction-to-lead value enables thermal design with standard lead-mounting practices |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by color band; leads are annealed matte-tin plated (RoHS compliant, solderable per MIL-STD-750 Method 2026).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias reference terminal | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode | Regulated output terminal | Banded end; supplies stable 8.7 V reference when reverse-biased above breakdown |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures industry-standard pin compatibility, test methodology, and interchangeability |
| ±10% voltage tolerance (A suffix) | Cost-optimized regulation accuracy suitable for non-critical reference and clamp applications |
| Moisture sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out before assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Robust handling in manufacturing without special static control beyond standard practice |
| e3 RoHS-compliant plating | Matte-tin termination meets lead-free soldering requirements and avoids tin whisker risk |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in optocoupler-based feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference sets error amplifier threshold; provides stable 8.7 V reference for TL431 or similar shunt regulators. Use Value: Low ΔVZ (0.20 V) minimizes output voltage drift across load steps; 545 mA IZM supports robust bias current delivery. |
Use Scenario: Placed across sensitive IC inputs or bus lines to limit transient overvoltage events. IC Role / Device Role / Timing Role: Acts as passive crowbar element, clamping voltage to ≤9.6 V (8.7 V × 1.1) during surges. Use Value: 545 A surge rating (8.3 ms half-sine) absorbs high-energy transients without failure; RoHS plating ensures reliability in lead-free reflow. |
| Industrial Sensor Signal Conditioning | Programmable Logic Controller (PLC) Input Protection |
Use Scenario: Provides stable bias voltage for analog sensor front-end amplifiers in harsh environments. IC Role / Device Role / Timing Role: Supplies regulated 8.7 V reference to op-amp bias networks and ADC reference dividers. Use Value: Wide operating temperature range (–65°C to +150°C) maintains regulation stability in uncontrolled enclosures; 25 °C/W RθJL allows direct PCB lead-mounting without heatsink. |
Use Scenario: Mounted on PLC digital input modules to protect microcontroller GPIOs from field-wiring transients. IC Role / Device Role / Timing Role: Reverse-biased Zener shunts induced surges to ground before reaching logic-level components. Use Value: 2.0 Ω ZZ ensures fast response and minimal overshoot; axial T-18 package allows manual replacement in field-serviceable modules. |
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 | Same 8.7 V nominal VZ, but ±5% tolerance (B suffix) and higher IZM (545 mA vs. same, but tighter VZ spec) | Preferred where tighter regulation accuracy is required, e.g., precision feedback or calibration references | Select 1N5345B if system requires <±5% VZ drift over temperature and current; otherwise 1N5345AE3/TR12 offers cost advantage. |
| MMBZ5235B (SOT-23) | Surface-mount, 8.2 V nominal, ±5%, 200 mW PD, 100 mA IZM - not power-compatible | Only suitable for low-power signal-level clamping, not 5 W regulation or high-current biasing | Choose MMBZ5235B only for space-constrained PCBs with sub-100 mA loads; 1N5345AE3/TR12 remains necessary for >100 mA or thermal-stressed environments. |
Compared with 1N5345B, the 1N5345AE3/TR12 trades voltage accuracy for cost and availability in tape-and-reel; compared with MMBZ5235B, it delivers 25× higher power handling and axial-leaded serviceability-critical for industrial power and protection designs.
Availability
1N5345AE3/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial sensor signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for 1N5345AE3/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 1N53xx series was designed for ruggedized voltage regulation in mission-critical power systems, emphasizing thermal robustness, surge resilience, and extended temperature operation.
FAQ
What is the Zener voltage tolerance of the 1N5345AE3/TR12?
The 1N5345AE3/TR12 has a Zener voltage tolerance of ±10%, indicated by the "A" suffix in its part number. This means its actual breakdown voltage falls within 7.83 V to 9.57 V at 150 mA test current and 25°C lead temperature. The tolerance is verified per JEDEC JESD201 standards and applies across the full operating temperature range.
Does the 1N5345AE3/TR12 require dry packing before PCB assembly?
No, the 1N5345AE3/TR12 has IPC/JEDEC J-STD-020B moisture sensitivity level 1, meaning it does not absorb sufficient moisture during ambient storage to require dry packing or baking prior to reflow soldering. Its void-free epoxy encapsulation and Level 1 rating eliminate pre-assembly moisture mitigation steps.
What is the maximum continuous Zener current for the 1N5345AE3/TR12 at 25°C?
The maximum continuous Zener current (IZM) for the 1N5345AE3/TR12 is 545 mA at 25°C lead temperature (TL), derived from its 5.0 W power rating and upper-limit Zener voltage (8.7 V × 1.1 = 9.57 V). This assumes adequate heat sinking per the specified 10 mm lead length mounting condition.
Can the 1N5345AE3/TR12 be used in surface-mount designs?
No-the 1N5345AE3/TR12 is an axial-leaded T-18 package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5345B (DO-214AA) and SMBG5345B (DO-214AB), both with identical 8.7 V ±5% specification but different thermal and mechanical characteristics.
What does the "e3" and "TR12" suffix mean in 1N5345AE3/TR12?
The "e3" suffix indicates RoHS-compliant matte-tin lead plating per JEDEC standards; "TR12" denotes tape-and-reel packaging per EIA-296, with 12,000 units per reel. Together, 1N5345AE3/TR12 specifies a lead-free, automated-assembly-ready version of the 8.7 V Zener diode in industry-standard bulk packaging.
1N5345AE3/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:
- ±10%
- 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
1N5345AE3/TR12 FAQ
1.How can I place an order for 1N5345AE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5345AE3/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 1N5345AE3/TR12 reliable?
The price and inventory of 1N5345AE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5345AE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5345AE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5345AE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5345AE3/TR12?
1N5345AE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5345AE3/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 1N5345AE3/TR12?
For technical support, including 1N5345AE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5345AE3/TR12 requirements.
6.How does Aetrix verify that 1N5345AE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5345AE3/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 1N5345AE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5345AE3/TR12?
All 1N5345AE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5345AE3/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 1N5345AE3/TR12 part is unused and in its original packaging.
Return procedure for 1N5345AE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5345AE3/TR12 Tags
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MM5Z5V1ST1G
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