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Microchip Technology 1N4745CPE3/TR12
- Part No.:
- 1N4745CPE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4745CPE3/TR12.pdf
- Description:
- DIODE ZENER 16V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:3,158
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Product details
Overview
1N4745CPE3/TR12 from Microsemi is a 16 V, ±2% tolerance, 1 W silicon Zener diode in DO-41 plastic package, rated for 15.5 mA test current, 16 Ω dynamic impedance at IZT, and 700 μA reverse leakage at 12.2 V. It provides precision voltage regulation in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N4745CPE3/TR12 datasheet, 1N4745CPE3/TR12 pinout, 1N4745CPE3/TR12 application, or 1N4745CPE3/TR12 equivalent, key selection criteria include its tight 2% VZ tolerance, low ZZT, RoHS-compliant matte-tin plating, and TR12 tape-and-reel packaging for automated assembly.
Technical Context
This Zener operates in reverse breakdown to maintain stable output voltage under varying load and line conditions. Its 16 V nominal Zener voltage exhibits a positive temperature coefficient above ~5 V, with typical TC of +8.5 mV/°C per Figure 3 in the datasheet.
The device is characterized at 25 °C lead temperature with 90-second stabilization time, and supports steady-state dissipation of 1.0 W at TL < 105 °C (3/8″ from body) or TA < 45 °C on FR4 board with defined copper pad geometry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16 V ±2% - precise regulation point for feedback networks and voltage references |
| Test Current (IZT) | 15.5 mA - operating point where VZ and ZZT are specified; sets minimum bias requirement |
| Dynamic Impedance (ZZT) | 16 Ω at IZT - low AC resistance ensures minimal output voltage variation under dynamic load changes |
| Max Reverse Leakage (IR) | 5 μA at 12.2 V - guarantees low quiescent current in standby or high-impedance sensing paths |
| Power Dissipation | 1.0 W at TL ≤ 105 °C - defines thermal design margin for PCB trace width and heatsinking |
| Operating Temperature | −65 °C to +150 °C - supports deployment in automotive under-hood and industrial control environments |
| Package | DO-41 (DO-204AL) - axial-leaded, JEDEC-standard plastic package with cathode band marking |
Pinout & Package
DO-41 plastic package: axial-leaded, void-free thermosetting epoxy body (UL94V-0), cathode indicated by colored band; terminals are tin-lead or RoHS-compliant matte-tin plated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node; reverse-biased during regulation |
| Cathode | Zener breakdown terminal / regulation output | Banded end; connected to higher-potential node; delivers regulated voltage at this terminal |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables tighter feedback loop accuracy without external trimming in power supply designs |
| RoHS-compliant "e3" suffix | Meets EU RoHS Directive 2011/65/EU with annealed matte-tin plating, compatible with lead-free reflow |
| Tape-and-reel packaging (TR12) | Standard EIA-296 compliant carrier with 12 mm tape width, optimized for SMT pick-and-place feeders |
| Moisture sensitivity Level 1 | No dry pack required prior to assembly-reduces handling cost and avoids moisture-related popcorning |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands human-body-model ESD events without parameter shift-simplifies handling in non-EPA areas |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Stabilizing output voltage in linear regulator feedback divider networks. IC Role / Device Role / Timing Role: Zener diode providing precise 16 V reference to error amplifier input. Use Value: ±2% VZ tolerance ensures output regulation within ±0.5% over line/load/temperature in discrete LDO designs. | Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage to 16 V during surge or ESD event. Use Value: 1 W power rating allows absorption of 100–200 ms transients up to 16 V × IZM = 285 mA peak. |
| Voltage Monitoring Threshold | Industrial Sensor Excitation |
Use Scenario: Detecting battery undervoltage or overvoltage thresholds in 12 V systems. IC Role / Device Role / Timing Role: Zener-based comparator reference set to 16 V for high-side overvoltage alarm. Use Value: Low 5 μA leakage at 12.2 V minimizes false triggering in high-impedance monitoring circuits. | Use Scenario: Providing stable excitation voltage to resistive bridge sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Precision 16 V shunt regulator powering Wheatstone bridge elements. Use Value: 16 Ω ZZT ensures <10 mV output shift under 1 mA sensor current variation-critical for 12-bit ADC accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4745A | Same 16 V nominal, but ±5% tolerance (A suffix) and no RoHS "e3" designation | Acceptable where tighter tolerance not required; not RoHS-compliant | Select when cost sensitivity outweighs precision and environmental compliance needs |
| BZX84-C16 | SOT-23 surface-mount package; same 16 V ±5%; 300 mW rating; different thermal profile | Used in space-constrained PCBs; lower power handling limits surge capability | Choose for compact layouts where 1 W dissipation is not required and reflow compatibility is confirmed |
Compared with 1N4745A and BZX84-C16, the 1N4745CPE3/TR12 offers superior voltage precision and full RoHS compliance in a through-hole package optimized for manual prototyping and high-reliability power stages-making it ideal for industrial power supplies requiring long-term stability and regulatory adherence.
Availability
1N4745CPE3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and programmable logic controller (PLC) analog input conditioning requiring stable component supply and long-lifecycle support.
Supply support for 1N4745CPE3/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed specifically for robust, cost-effective voltage regulation in harsh-environment power systems-emphasizing thermal resilience, moisture immunity, and MIL-grade screening compatibility.
FAQ
What is the Zener voltage tolerance of the 1N4745CPE3/TR12?
The 1N4745CPE3/TR12 has a nominal Zener voltage of 16 V with a tolerance of ±2%, as indicated by the "C" suffix in the part number. This tighter tolerance enables higher accuracy in voltage reference and feedback applications compared to standard ±5% variants like the 1N4745A. The 1N4745CPE3/TR12 achieves this specification under JEDEC test conditions at 25 °C lead temperature.
Is the 1N4745CPE3/TR12 RoHS compliant?
Yes, the 1N4745CPE3/TR12 is RoHS compliant, as confirmed by the "e3" suffix in its part number. It features RoHS-compliant annealed matte-tin plating on its leads and meets the requirements of EU Directive 2011/65/EU. The device is qualified for lead-free reflow soldering processes with a maximum solder temperature of 260 °C for 10 seconds.
What does the "TR12" suffix indicate in 1N4745CPE3/TR12?
The "TR12" suffix indicates that the 1N4745CPE3/TR12 is supplied in tape-and-reel packaging conforming to EIA-296 standards, with a 12 mm tape width. This format supports automated surface-mount assembly equipment and ensures consistent feeding and placement reliability. The reel quantity is standardized for TR12 carriers per Microsemi's packaging specifications.
What is the maximum Zener current (IZM) for the 1N4745CPE3/TR12 at 50 °C ambient?
The maximum Zener current (IZM) for the 1N4745CPE3/TR12 is 285 mA at TA = 50 °C, derived from its 1.0 W power rating and 16 V nominal Zener voltage (IZM = PZ/VZ). This value assumes operation within thermal limits and accounts for derating per the power dissipation curve in the datasheet. Exceeding IZM risks thermal runaway or parametric shift.
How is polarity marked on the 1N4745CPE3/TR12?
The 1N4745CPE3/TR12 uses a cathode band to indicate polarity: the banded end is the cathode and must be connected to the higher-potential node during Zener operation. When used in forward bias, the anode (unbanded end) is positive relative to the cathode. This marking follows JEDEC DO-41 standard conventions and is visible on the plastic body adjacent to the lead.
1N4745CPE3/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)
1N4745CPE3/TR12 FAQ
1.How can I place an order for 1N4745CPE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4745CPE3/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 1N4745CPE3/TR12 reliable?
The price and inventory of 1N4745CPE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4745CPE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4745CPE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4745CPE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4745CPE3/TR12?
1N4745CPE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4745CPE3/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 1N4745CPE3/TR12?
For technical support, including 1N4745CPE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4745CPE3/TR12 requirements.
6.How does Aetrix verify that 1N4745CPE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4745CPE3/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 1N4745CPE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4745CPE3/TR12?
All 1N4745CPE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4745CPE3/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 1N4745CPE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4745CPE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4745CPE3/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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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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SMAZ12-13-F
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