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Microchip Technology 1N4745CP/TR12
- Part No.:
- 1N4745CP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4745CP/TR12.pdf
- Description:
- DIODE ZENER 16V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,882
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Product details
Overview
1N4745CP/TR12 from Microsemi is a 16 V, 1 W silicon Zener diode in DO-41 plastic package with ±5% voltage tolerance, 15.5 mA test current (IZT), and 16 Ω dynamic impedance (ZZT) at IZT-used for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4745CP/TR12 datasheet, 1N4745CP/TR12 pinout, 1N4745CP/TR12 application, or 1N4745CP/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45 °C/W junction-to-lead), surge current rating (285 mA), reverse leakage (5 µA at 12.2 V), and RoHS-compliant "e3" plating with tape-and-reel packaging (TR12).
Technical Context
This axial-lead Zener operates in reverse breakdown to maintain stable output voltage across varying load and line conditions. It exhibits a sharp knee at 15.5 mA test current and supports continuous regulation from 0.25 mA minimum knee current (IZK) up to 285 mA maximum regulator current (IZM) at TA = 50 °C.
Its temperature coefficient is +3.5 mV/°C near 16 V, enabling predictable drift compensation in analog references. The device is moisture-sensitive Level 1 per J-STD-020B and rated for -65 °C to +150 °C operation with 1.2 V forward voltage max at 200 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16 V ±5% at 15.5 mA - defines nominal regulation point with tight tolerance suitable for reference design |
| Power Dissipation | 1.0 W at TL < 105 °C - limits thermal design margin on PCB leads; derates linearly above 25 °C ambient |
| Dynamic Impedance (ZZT) | 16 Ω at IZT = 15.5 mA - determines output voltage stability under dynamic load changes |
| Reverse Leakage (IR) | 5 µA max at VR = 12.2 V - ensures low quiescent current in standby regulation paths |
| Surge Current (ISM) | 285 mA (½-sine, 1/120 s) - withstands transient overloads without degradation |
| Thermal Resistance | 45 °C/W junction-to-lead (3/8″ lead length) - guides heatsinking via lead termination |
| Forward Voltage | 1.2 V max at IF = 200 mA - relevant for polarity-check or clamp-forward conduction scenarios |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by color band; terminals are anode and cathode only-no internal circuitry or multi-pin configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or lower-potential rail during Zener operation |
| Cathode | Regulated output node | Banded end; connected to input rail to sink current and clamp voltage at 16 V |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N47xxAP registration | Industry-standard footprint and electrical behavior compatible with legacy designs |
| RoHS-compliant "e3" plating | Matte-tin terminations meeting lead-free soldering requirements (260 °C/10 s) |
| Tape-and-reel packaging (TR12) | Standard EIA-296 format supporting automated SMT placement despite axial form factor |
| Moisture sensitivity Level 1 | No dry-pack required before assembly-reduces handling cost and process steps |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020-enables safe handling in standard lab environments |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete op-amp references. IC Role / Device Role / Timing Role: Zener diode provides fixed 16 V reference to error amplifier input. Use Value: ±5% tolerance and 16 Ω dynamic impedance ensure <±0.8 V output variation across load transients. | Use Scenario: Protecting microcontroller I/O pins from 24 V industrial bus surges. IC Role / Device Role / Timing Role: Shunts excess voltage above 16 V to ground during transient events. Use Value: 285 mA surge rating handles repetitive 100 V/100 ms spikes without parametric shift. |
| Signal Level Translation | Current Source Bias |
Use Scenario: Generating 16 V bias for analog sensor excitation in 24 V systems. IC Role / Device Role / Timing Role: Acts as passive voltage translator between supply rail and sensor interface. Use Value: Low 5 µA leakage at 12.2 V minimizes error in high-impedance bias networks. | Use Scenario: Setting constant current for LED driver or op-amp bias network. IC Role / Device Role / Timing Role: Provides stable 16 V reference to current-setting resistor. Use Value: 45 °C/W thermal resistance enables stable current over -40 °C to +85 °C ambient. |
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 "P" suffix → glass-body DO-35 package; higher thermal resistance (60 °C/W) | Less suitable for high-power-density layouts requiring low junction-to-lead Rθ | Select 1N4745CP/TR12 when board space or thermal performance demands plastic DO-41 |
| MMSZ4705T1G | Surface-mount SOD-123; 16 V ±5%, 500 mW rating; 20 Ω ZZT at 5 mA | Limited to lower-power applications due to 0.5 W dissipation and different test current | Choose MMSZ4705T1G only for space-constrained PCBs where 1 W dissipation is not required |
Compared with 1N4745A and MMSZ4705T1G, the 1N4745CP/TR12 delivers superior thermal performance (45 °C/W vs. 60 °C/W), full 1 W power handling, and tape-and-reel readiness-making it optimal for industrial power supplies needing robust, through-hole Zener regulation.
Availability
1N4745CP/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and test equipment requiring stable component supply with RoHS compliance and JEDEC-standard reliability.
Supply support for 1N4745CP/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 1N47xxAP series was designed specifically for general-purpose voltage regulation in ruggedized power systems where JEDEC compatibility, thermal robustness, and long-term parameter stability are critical.
FAQ
What is the Zener voltage tolerance of the 1N4745CP/TR12?
The 1N4745CP/TR12 has a nominal Zener voltage of 16 V with a ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. This tolerance is verified at 15.5 mA test current and 25 °C lead temperature. The 1N4745CP/TR12 maintains this specification across its rated operating temperature range of -65 °C to +150 °C, making it suitable for precision reference applications where moderate initial accuracy is required.
Does the 1N4745CP/TR12 support lead-free soldering processes?
Yes, the 1N4745CP/TR12 features RoHS-compliant "e3" matte-tin plating and is qualified for lead-free reflow with a maximum solder temperature of 260 °C for 10 seconds. Its thermosetting epoxy case meets UL94V-0 flammability rating, and the device complies with IPC/JEDEC J-STD-020B moisture sensitivity Level 1-eliminating dry-pack requirements prior to assembly.
What is the maximum surge current rating for the 1N4745CP/TR12?
The 1N4745CP/TR12 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 short-duration transients such as ESD or inductive kickback, and the device retains full parametric integrity after such events when operated within its thermal limits.
How does the thermal resistance of the 1N4745CP/TR12 affect PCB layout?
The 1N4745CP/TR12 has a junction-to-lead thermal resistance of 45 °C/W at 3/8″ (10 mm) lead length from the body. To maintain 1 W power dissipation, PCB traces connected to its leads must provide adequate copper area-Microsemi specifies 4 mm² pads with 1 mm track width and 25 mm length for 105 °C/W junction-to-ambient performance on FR4. Shorter leads improve thermal transfer significantly.
Is the 1N4745CP/TR12 suitable for use as a voltage reference in precision analog circuits?
The 1N4745CP/TR12 offers usable precision for non-critical analog references, with 16 Ω dynamic impedance at 15.5 mA and +3.5 mV/°C temperature coefficient near 16 V. While not a low-noise or ultra-stable reference like a bandgap IC, its JEDEC-standard behavior, low leakage (5 µA at 12.2 V), and repeatable knee make it appropriate for cost-sensitive industrial sensors and power supply feedback loops where ±1% total variation is acceptable.
1N4745CP/TR12 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)
1N4745CP/TR12 FAQ
1.How can I place an order for 1N4745CP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4745CP/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 1N4745CP/TR12 reliable?
The price and inventory of 1N4745CP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4745CP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4745CP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4745CP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4745CP/TR12?
1N4745CP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4745CP/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 1N4745CP/TR12?
For technical support, including 1N4745CP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4745CP/TR12 requirements.
6.How does Aetrix verify that 1N4745CP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4745CP/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 1N4745CP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4745CP/TR12?
All 1N4745CP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4745CP/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 1N4745CP/TR12 part is unused and in its original packaging.
Return procedure for 1N4745CP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4745CP/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
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
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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