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Microchip Technology 1N4745APE3/TR8
- Part No.:
- 1N4745APE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4745APE3/TR8.pdf
- Description:
- DIODE ZENER 16V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,102
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Product details
Overview
1N4745APE3/TR8 from Microsemi is a 16 V, 5% tolerance, 1 W axial-lead Zener diode in DO-41 plastic package, rated for 15.5 mA test current (IZT), 16 Ω dynamic impedance (ZZT), and 5 μA reverse leakage at 12.2 V (VR), used for precision voltage regulation in power supply feedback loops and reference circuits.
For engineers reviewing the 1N4745APE3/TR8 datasheet, 1N4745APE3/TR8 pinout, 1N4745APE3/TR8 application, or 1N4745APE3/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (45 °C/W junction-to-lead), surge current rating (285 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR8).
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across varying load and line conditions. It delivers regulated output with a sharp knee at IZK = 0.25 mA and ZZK = 57 Ω, and supports continuous operation from –65 °C to +150 °C with moisture sensitivity level 1 per J-STD-020B.
Its DO-41 package features void-free UL94V-0 epoxy body, cathode band polarity marking, and tin-lead or RoHS-compliant annealed matte-tin terminals solderable per MIL-STD-750 Method 2026 at 260 °C for 10 s max.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16 V ±5% at IZT = 15.5 mA - defines nominal regulation point under standard test condition |
| Power Dissipation | 1.0 W at TL < 105 °C (3/8″ lead length) - sets maximum steady-state thermal load without derating |
| Dynamic Impedance | 16 Ω at IZT = 15.5 mA - determines output voltage variation under small-signal AC load changes |
| Reverse Leakage | 5 μA max at VR = 12.2 V - ensures low quiescent current in standby or high-impedance bias networks |
| Surge Current (ISM) | 285 mA (½-sine, 1/120 s) - defines short-duration overload capability during transient events |
| Thermal Resistance | 45 °C/W junction-to-lead - enables thermal design using lead conduction path, not board convection |
| Forward Voltage | 1.2 V max at IF = 200 mA - relevant for forward-conduction protection or dual-use rectifier applications |
Pinout & Package
DO-41 (DO-204AL) plastic axial-lead package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node in Zener regulation; forward conduction path when biased positive |
| Cathode | Banded end | Connected to higher-potential node; Zener breakdown occurs with cathode positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1 W Zener | Fully compliant with JEDEC 1N47xxA series standards for interchangeability and test methodology |
| RoHS-compliant "e3" suffix | Matte-tin terminal plating meeting EU RoHS Directive 2011/65/EU and J-STD-609A Class 1 |
| Tape-and-reel "TR8" option | EIA-296 standard packaging for automated SMT placement compatibility despite axial-lead form factor |
| Moisture Sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies handling and eliminates bake-out prior to assembly |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - withstands human-body-model discharges without parameter shift or failure |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Integrated into optocoupler feedback network of isolated DC-DC converters to regulate output voltage within ±5%. IC Role / Device Role / Timing Role: Voltage reference element providing stable 16 V threshold for error amplifier comparison. Use Value: Maintains regulation accuracy over –40 °C to +85 °C ambient with <16 Ω dynamic impedance limiting loop gain variation. | Use Scenario: Placed across sensitive IC inputs to clamp transients exceeding 16 V during hot-swap or ESD events. IC Role / Device Role / Timing Role: Shunt protection device conducting surge current up to 285 mA for 8.3 ms without degradation. Use Value: Limits voltage excursion to ≤16.5 V (VZ + 5%) while dissipating transient energy within 1 W thermal envelope. |
| Low-Power Voltage Reference | Industrial Sensor Excitation |
Use Scenario: Biasing precision op-amp circuits requiring stable 16 V reference in battery-powered instrumentation. IC Role / Device Role / Timing Role: Passive two-terminal reference source with 5 μA leakage minimizing current draw in high-Z networks. Use Value: Enables >10-year shelf life in coin-cell designs due to sub-μA standby current and no active circuitry. | Use Scenario: Supplying excitation voltage to resistive bridge sensors (e.g., strain gauges) in factory automation modules. IC Role / Device Role / Timing Role: Stable excitation source maintaining constant 16 V despite 10–100 mA load variations. Use Value: Reduces measurement drift to <0.05%/°C via tight 5% VZ tolerance and low tempco (≈+3 mV/°C at 16 V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4745A | No "e3" RoHS suffix; Sn/Pb terminations; same VZ, IZT, ZZT, and package | Not suitable for RoHS-compliant production; requires Pb-containing solder process | Select only for legacy Pb-based assembly or non-RoHS exempt programs |
| MMSZ4705T1G | Surface-mount SOD-123 package; 16 V ±5%; 500 mW rating; 20 Ω ZZT at 5 mA | Lower power and smaller footprint; requires PCB redesign; not axial-lead compatible | Choose when space-constrained layout or automated pick-and-place is prioritized over through-hole mounting |
Compared with 1N4745A and MMSZ4705T1G, the 1N4745APE3/TR8 uniquely combines RoHS compliance, 1 W power handling, DO-41 mechanical robustness, and EIA-296 tape-and-reel support-making it optimal for industrial through-hole production where reliability, thermal margin, and regulatory compliance are jointly required.
Availability
1N4745APE3/TR8 is available at Aetrix Electronics and suitable for switching power supplies, overvoltage clamping circuits, low-power voltage references, and industrial sensor excitation systems requiring stable component supply and full RoHS compliance.
Supply support for 1N4745APE3/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 1N47xxAP series was designed specifically for general-purpose, high-stability Zener regulation in harsh-environment power systems where long-term parameter stability, ESD immunity, and moisture resilience are critical.
FAQ
What is the Zener voltage tolerance of the 1N4745APE3/TR8?
The 1N4745APE3/TR8 has a nominal Zener voltage of 16 V with a ±5% tolerance, as indicated by the "A" suffix per JEDEC standard. This means the actual measured VZ at IZT = 15.5 mA falls between 15.2 V and 16.8 V at TL = 25 °C. The tolerance is guaranteed across the full operating temperature range of –65 °C to +150 °C, and is unaffected by the "e3" RoHS or "TR8" tape-and-reel suffixes.
Does the 1N4745APE3/TR8 require dry packing before reflow?
No, the 1N4745APE3/TR8 does not require dry packing. It is classified as Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it may be stored indefinitely at ambient conditions without baking. This eliminates pre-reflow bake steps and reduces handling risk in manufacturing, especially for high-mix production lines handling both moisture-sensitive and non-sensitive components.
What is the maximum surge current rating for the 1N4745APE3/TR8?
The 1N4745APE3/TR8 has a maximum surge current (ISM) rating of 285 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating applies to transient overvoltage events such as ESD or inductive kickback. Exceeding this value-even briefly-may cause irreversible junction damage, so external current-limiting resistors must be sized to ensure peak surge current remains within this limit.
How does the thermal resistance of the 1N4745APE3/TR8 affect PCB layout?
The 1N4745APE3/TR8 has a junction-to-lead thermal resistance of 45 °C/W when measured at 3/8″ (10 mm) lead length from the body. This means heat is primarily conducted through the leads-not the PCB-and layout should prioritize adequate lead length and copper land area for mechanical stability and heat spreading. Unlike surface-mount Zeners, FR4 board copper area has minimal impact on thermal performance; instead, lead termination integrity and solder joint quality dominate thermal reliability.
Is the 1N4745APE3/TR8 pin-compatible with older 1N4745A variants?
Yes, the 1N4745APE3/TR8 is mechanically and electrically identical to the legacy 1N4745A in DO-41 package, including pinout, dimensions, and electrical parameters. The "P" denotes plastic construction (vs. glass "G"), "e3" indicates RoHS-compliant matte-tin plating, and "TR8" specifies EIA-296 tape-and-reel packaging-none of which alter pin function or physical interface. It is a direct replacement in existing footprints and schematics.
1N4745APE3/TR8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 16 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 16 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 12.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
1N4745APE3/TR8 FAQ
1.How can I place an order for 1N4745APE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4745APE3/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 1N4745APE3/TR8 reliable?
The price and inventory of 1N4745APE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4745APE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4745APE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4745APE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4745APE3/TR8?
1N4745APE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4745APE3/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 1N4745APE3/TR8?
For technical support, including 1N4745APE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4745APE3/TR8 requirements.
6.How does Aetrix verify that 1N4745APE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4745APE3/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 1N4745APE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4745APE3/TR8?
All 1N4745APE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4745APE3/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 1N4745APE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4745APE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4745APE3/TR8 Tags
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MM5Z5V1ST1G
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