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Microchip Technology 1N4745CE3/TR13
- Part No.:
- 1N4745CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4745CE3/TR13.pdf
- Description:
- DIODE ZENER 16V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,579
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Product details
Overview
1N4745CE3/TR13 from Microsemi is a 16 V, 5% tolerance, 1 W silicon 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 1N4745CE3/TR13 datasheet, 1N4745CE3/TR13 pinout, 1N4745CE3/TR13 application, or 1N4745CE3/TR13 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (45 °C/W junction-to-lead), surge current rating (285 mA), operating temperature range (–65 °C to +150 °C), and RoHS-compliant matte-tin plating.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable output voltage across varying load and line conditions. It exhibits a sharp knee at IZK = 0.25 mA with ZZK = 57 Ω and supports steady-state dissipation of 1.0 W at lead temperature <105 °C or ambient <45 °C on FR4 board.
Its DO-41 axial-leaded package features void-free UL94V-0 epoxy body, cathode band polarity marking, and solderability per MIL-STD-750 Method 2026. Thermal performance is specified for 3/8" (10 mm) lead length from body and validated per IPC/JEDEC J-STD-020B Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16 V ±5% at IZT = 15.5 mA - defines nominal regulation point with tight tolerance for stable reference generation |
| Power Dissipation | 1.0 W at TL < 105 °C - sets maximum continuous thermal load under lead-heatsink conditions |
| Dynamic Impedance | 16 Ω at IZT - determines output voltage variation under changing load current |
| Reverse Leakage | 5 μA at VR = 12.2 V - ensures low standby power loss in high-impedance bias networks |
| Surge Current | 285 mA (½-sine, 1/120 s) - supports transient overvoltage handling without degradation |
| Thermal Resistance | 45 °C/W junction-to-lead - enables thermal design with discrete heatsinking via leads |
| Operating Temp | –65 °C to +150 °C - qualifies for industrial, automotive under-hood, and aerospace environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by colored band; terminals are anode and cathode with no internal circuitry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; connected to regulated voltage node; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N47xxA registration | Industry-standard footprint and electrical behavior ensuring interoperability across suppliers |
| RoHS-compliant "e3" suffix | Matte-tin plating compliant with EU RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 3 |
| Moisture Sensitivity Level 1 | No dry pack required prior to assembly - reduces handling cost and process complexity |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in production |
| Tape-and-reel packaging | "TR13" suffix denotes EIA-296 standard 13-inch reel - enables automated SMT placement compatibility |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters using optocoupler feedback loop. IC Role / Device Role / Timing Role: Zener diode provides precise 16 V reference to TL431 shunt regulator input or directly biases optocoupler LED. Use Value: 5% tolerance and 16 Ω dynamic impedance ensure ±0.8 V regulation accuracy and minimal load-induced drift. | Use Scenario: Supplies stable excitation voltage to resistive bridge sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Functions as two-terminal voltage reference replacing higher-cost IC references where 1% absolute accuracy is not required. Use Value: –65 °C to +150 °C operating range and 5 μA leakage enable reliable operation in unconditioned industrial enclosures. |
| Overvoltage Protection Clamp | Microcontroller Reset Circuit |
Use Scenario: Clamps transient spikes on 12 V rail in automotive body control modules. IC Role / Device Role / Timing Role: Connected anode-to-ground, cathode-to-rail; conducts above 16 V to divert surge energy. Use Value: 285 mA surge current rating and 1 W steady-state dissipation handle ISO 7637-2 pulse 1/2a without failure. | Use Scenario: Generates clean reset threshold for 3.3 V microcontrollers using resistor divider from 5 V supply. IC Role / Device Role / Timing Role: Provides temperature-stable 16 V reference to comparator input for accurate reset voltage detection. Use Value: Low 57 Ω knee impedance (at IZK = 0.25 mA) ensures sharp turn-on and minimal hysteresis in reset assertion. |
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 lead-free assembly; otherwise identical functional behavior | Select when legacy Pb-based soldering processes are used and RoHS compliance is not required |
| MMSZ4705ET1G | Surface-mount SOD-123 package; 16 V ±5%; 500 mW rating; 20 Ω ZZT at 5 mA | Lower power and different thermal path; requires PCB layout change and requalification | Choose for space-constrained designs where DO-41 axial leads are impractical |
Compared with 1N4745A and MMSZ4705ET1G, the 1N4745CE3/TR13 offers RoHS compliance, tape-and-reel automation support, and full 1 W power handling in a JEDEC-standard through-hole package-making it optimal for industrial power supplies requiring long-term component availability and mixed-technology assembly.
Availability
1N4745CE3/TR13 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, overvoltage clamping circuits, and microcontroller reset networks requiring stable component supply across multi-year production cycles.
Supply support for 1N4745CE3/TR13 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 1N47xxA series was designed to deliver JEDEC-standard, high-stability Zener regulation in cost-effective plastic packages for power management and voltage reference applications across harsh environments.
FAQ
What is the Zener voltage tolerance of the 1N4745CE3/TR13?
The 1N4745CE3/TR13 has a Zener voltage tolerance of ±5%, as indicated by the "C" suffix in the part number. This means its nominal 16 V Zener voltage is guaranteed between 15.2 V and 16.8 V at 15.5 mA test current and 25 °C lead temperature. The tolerance is tighter than the base 1N4745A (no suffix = ±10%) and looser than D-suffix variants (±1%).
Does the 1N4745CE3/TR13 require dry packing before reflow soldering?
No, the 1N4745CE3/TR13 does not require dry packing. It is moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ≤30 °C/60% RH without baking. This eliminates pre-reflow baking steps and simplifies manufacturing flow for both through-hole and reflow-compatible assembly.
What is the maximum surge current rating for the 1N4745CE3/TR13?
The 1N4745CE3/TR13 has a maximum non-repetitive 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 load dump or ESD coupling, and must be derated per thermal limits if repeated frequently.
Can the 1N4745CE3/TR13 be used in surface-mount designs?
No, the 1N4745CE3/TR13 uses a DO-41 axial-leaded package and is not surface-mount compatible. For SMT implementation, consider the MMSZ4705ET1G (SOD-123, 16 V, 500 mW) or SMAJ4745A (SMA, 16 V, 1 W), both of which are Microsemi's surface-mount equivalents with different thermal and mounting characteristics.
What does the "TR13" suffix indicate in 1N4745CE3/TR13?
"TR13" indicates tape-and-reel packaging per EIA-296 standard on a 13-inch diameter reel. This format supports automated pick-and-place assembly for through-hole components and ensures consistent orientation (cathode band facing same direction) and quantity control (typically 5,000 units per reel). It is distinct from bulk or ammo-pack options.
1N4745CE3/TR13 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:
- ±2%
- 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)
1N4745CE3/TR13 FAQ
1.How can I place an order for 1N4745CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4745CE3/TR13 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 1N4745CE3/TR13 reliable?
The price and inventory of 1N4745CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4745CE3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N4745CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4745CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4745CE3/TR13?
1N4745CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4745CE3/TR13 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 1N4745CE3/TR13?
For technical support, including 1N4745CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4745CE3/TR13 requirements.
6.How does Aetrix verify that 1N4745CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N4745CE3/TR13 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 1N4745CE3/TR13 meets industry standards.
7.What is the process for return or replacement of 1N4745CE3/TR13?
All 1N4745CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4745CE3/TR13, 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 1N4745CE3/TR13 part is unused and in its original packaging.
Return procedure for 1N4745CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4745CE3/TR13 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
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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SMAZ12-13-F
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