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Microchip Technology 1N4745CP/TR8
- Part No.:
- 1N4745CP/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4745CP/TR8.pdf
- Description:
- DIODE ZENER 16V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:5,840
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Product details
Overview
1N4745CP/TR8 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, and 16 Ω dynamic impedance at IZT, used for precision voltage regulation in power supply feedback loops and reference circuits.
For engineers reviewing the 1N4745CP/TR8 datasheet, 1N4745CP/TR8 pinout, 1N4745CP/TR8 application, or 1N4745CP/TR8 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 matte-tin plating.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across varying load and line conditions. It delivers regulated output at 16 V with 15.5 mA test current and exhibits low dynamic impedance (16 Ω) for minimal voltage deviation under dynamic current changes.
Designed for axial-leaded mounting on FR4 PCBs, it features 45 °C/W junction-to-lead thermal resistance at 10 mm lead length and supports steady-state dissipation of 1.0 W below 105 °C lead temperature or 45 °C ambient when mounted with specified copper pad geometry.
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 for stable reference generation |
| Power Dissipation | 1.0 W at TL < 105 °C - sets maximum continuous thermal load under defined lead-temperature condition |
| Dynamic Impedance (ZZT) | 16 Ω at IZT = 15.5 mA - determines small-signal AC voltage variation during load transients |
| Reverse Leakage Current | <5 µA at VR = 12.2 V - ensures minimal quiescent power loss in standby regulation mode |
| Surge Current (ISM) | 285 mA (½-sine, 1/120 s) - defines short-duration overload capability without degradation |
| Thermal Resistance | 45 °C/W junction-to-lead (3/8″ lead length) - enables thermal design with predictable junction temperature rise |
| Operating Temperature | –65 °C to +150 °C - supports deployment in extended industrial and aerospace environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by color band; terminals are non-polarized leads - anode and cathode defined solely by band marking, requiring banded end to be biased positive for Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Current sink in forward bias; reference node in reverse bias | Connected to lower-potential side of regulation circuit; must be held negative relative to cathode for Zener conduction |
| Cathode (banded end) | Regulated output node in reverse bias | Provides stable 16 V reference when reverse-biased; polarity marking is critical for correct orientation on PCB |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Ensures cross-manufacturer compatibility and standardized mechanical/electrical behavior per industry baseline |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints, simplifying SMT and manual assembly logistics |
| RoHS-compliant "e3" suffix option | Meets global environmental compliance mandates without performance trade-offs in Zener characteristics |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for special ESD workstations during board assembly |
| Plastic encapsulation (P suffix) | Delivers lower thermal resistance vs. glass-body variants, improving power handling in compact layouts |
Applications
| Switching Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in flyback or forward converter feedback networks using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Zener diode provides precise 16 V reference to bias TL431 or similar shunt regulator ICs in secondary-side control loops. Use Value: Maintains ±5% output regulation over temperature and line variations due to stable VZ and low ZZT. | Use Scenario: Supplies stable excitation voltage to bridge-based pressure or strain sensors in factory automation systems. IC Role / Device Role / Timing Role: Functions as a two-terminal voltage reference replacing higher-cost IC references where 1% accuracy is not required. Use Value: Delivers 16 V ±5% with <5 µA leakage at 12.2 V, minimizing sensor offset drift and self-heating errors. |
| Overvoltage Protection Clamp | Microcontroller Reset Circuit |
Use Scenario: Clamps transient surges on 15 V rail inputs in motor drive gate driver stages to protect logic-level MOSFETs. IC Role / Device Role / Timing Role: Acts as passive crowbar device conducting above 16 V to divert energy into series current-limiting resistor. Use Value: Withstands 285 mA surge current (½-sine, 1/120 s), enabling robust protection without external TVS dependency. | Use Scenario: Generates clean reset threshold for 16 V-powered microcontrollers in battery-backed instrumentation. IC Role / Device Role / Timing Role: Provides hysteresis-free, temperature-stable reset voltage trigger independent of supply ramp rate. Use Value: Operates reliably from –65 °C to +150 °C, ensuring deterministic reset assertion across wide environmental ranges. |
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 construction; higher thermal resistance (105 °C/W junction-to-ambient vs. 45 °C/W for 1N4745CP/TR8) | Less suitable for high-power-density layouts; requires larger copper area or forced cooling for same power dissipation | Select 1N4745CP/TR8 when thermal management is constrained or moisture sensitivity must be avoided |
| BZX55C16 | 0.5 W rating, 16 V ±5%, DO-35 package; 200 mA surge rating vs. 285 mA for 1N4745CP/TR8 | Lower power handling limits use in >500 mW regulation nodes; smaller footprint but reduced surge margin | Choose BZX55C16 only for space-constrained, low-current reference applications where 1 W capability is unnecessary |
Compared with 1N4745A and BZX55C16, the 1N4745CP/TR8 offers superior thermal performance in plastic packaging and higher surge current capacity, making it preferred for industrial power supplies and ruggedized sensor interfaces where reliability under thermal stress and transient overload is critical.
Availability
1N4745CP/TR8 is available at Aetrix Electronics and suitable for switching power supplies, industrial sensor references, overvoltage clamping circuits, and microcontroller reset networks requiring stable component supply and long-term obsolescence support.
Supply support for 1N4745CP/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N47xxAP series was engineered for cost-effective, JEDEC-standardized voltage regulation in commercial and extended-temperature applications, emphasizing robustness, moisture resilience, and RoHS compliance without sacrificing electrical performance.
FAQ
What is the Zener voltage tolerance of the 1N4745CP/TR8?
The 1N4745CP/TR8 has a Zener voltage tolerance of ±5%, as indicated by the "A" suffix in its part number. This means its nominal 16 V regulation point falls within 15.2 V to 16.8 V at 15.5 mA test current and 25 °C lead temperature, meeting JEDEC 1N47xxA standard specifications.
Does the 1N4745CP/TR8 require dry packing before soldering?
No, the 1N4745CP/TR8 does not require dry packing. Its plastic DO-41 package is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it has unlimited floor life and may be processed directly without baking or humidity-controlled storage.
What is the maximum surge current rating for the 1N4745CP/TR8?
The 1N4745CP/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 clamping scenarios and assumes proper series current limiting.
How does the thermal resistance of the 1N4745CP/TR8 compare to glass-body variants?
The 1N4745CP/TR8 has a junction-to-lead thermal resistance of 45 °C/W at 10 mm lead length, significantly lower than the 105 °C/W junction-to-ambient rating typical of glass-body 1N4745A devices. This enables higher sustained power dissipation in compact layouts without exceeding junction temperature limits.
Is the 1N4745CP/TR8 RoHS compliant?
Yes, the 1N4745CP/TR8 is RoHS compliant. The "e3" designation in its full ordering code confirms annealed matte-tin plating per RoHS requirements, and its void-free thermosetting epoxy body meets UL94V-0 flammability standards.
1N4745CP/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:
- ±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/TR8 FAQ
1.How can I place an order for 1N4745CP/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4745CP/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 1N4745CP/TR8 reliable?
The price and inventory of 1N4745CP/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4745CP/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4745CP/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4745CP/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4745CP/TR8?
1N4745CP/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4745CP/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 1N4745CP/TR8?
For technical support, including 1N4745CP/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4745CP/TR8 requirements.
6.How does Aetrix verify that 1N4745CP/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4745CP/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 1N4745CP/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4745CP/TR8?
All 1N4745CP/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4745CP/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 1N4745CP/TR8 part is unused and in its original packaging.
Return procedure for 1N4745CP/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4745CP/TR8 Tags
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Diodes Incorporated
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