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Microchip Technology 1N4745CPE3/TR8
- Part No.:
- 1N4745CPE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4745CPE3/TR8.pdf
- Description:
- DIODE ZENER 16V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,893
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Product details
Overview
1N4745CPE3/TR8 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 (IZT), 16 Ω dynamic impedance (ZZT), and 700 μA reverse leakage at 12.2 V (VR), used for precision voltage regulation in power supply feedback and reference circuits.
For engineers reviewing the 1N4745CPE3/TR8 datasheet, 1N4745CPE3/TR8 pinout, 1N4745CPE3/TR8 application, or 1N4745CPE3/TR8 equivalent, key selection factors include its tight 2% Zener voltage tolerance, DO-41 axial-leaded mechanical form, 1 W steady-state power rating at TL < 105°C, and RoHS-compliant matte-tin terminations.
Technical Context
This Zener operates in reverse breakdown to maintain stable output voltage across varying load and line conditions. Its 16 V nominal Zener voltage (VZ) is specified at 15.5 mA IZT with ±2% tolerance (C suffix), and exhibits low dynamic impedance (16 Ω at IZT) for minimal regulation error under current variation.
Thermal performance is defined by 45 °C/W junction-to-lead resistance at 10 mm lead length and 105 °C/W junction-to-ambient on FR4 with 4 mm² copper pads. It supports operation from –65 °C to +150 °C and withstands 260 °C soldering for 10 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16 V ±2% at 15.5 mA - ensures precise reference accuracy in feedback loops |
| Power Dissipation | 1.0 W at TL < 105°C - defines maximum continuous thermal load on leads |
| Dynamic Impedance (ZZT) | 16 Ω at IZT = 15.5 mA - determines regulation sensitivity to current changes |
| Reverse Leakage (IR) | 5 μA max at VR = 12.2 V - limits standby power loss in high-impedance bias networks |
| Test Current (IZT) | 15.5 mA - operating point where VZ and ZZT are guaranteed per JEDEC spec |
| Max Regulator Current (IZM) | 285 mA at TA = 50°C - sets absolute upper current limit before thermal runaway |
| Forward Voltage (VF) | 1.2 V max at 200 mA - relevant for polarity protection or series-switching use cases |
Pinout & Package
DO-41 (DO-204AL) axial-leaded plastic package with cathode indicated by color band; body diameter 2.0–2.7 mm, overall length 4.4–5.9 mm, lead diameter 0.4–0.6 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node during Zener operation; forward conduction path |
| Cathode | Banded end | Connected to higher-potential node during regulation; Zener breakdown occurs here |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tighter output voltage control in regulated supplies without post-regulation trimming |
| RoHS-compliant matte-tin plating | Ensures reliable solderability and compliance with environmental directives without Sn/Pb |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for SMT-compatible handling |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces need for special ESD handling during board assembly and testing |
| Plastic encapsulation (P suffix) | Provides lower thermal resistance vs. glass-body variants, improving power handling in compact layouts |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Stabilizing optocoupler input voltage in isolated flyback converter feedback paths. IC Role / Device Role / Timing Role: Zener reference element setting precise error amplifier threshold. Use Value: 16 V ±2% tolerance ensures consistent regulation setpoint across temperature and unit variance. | Use Scenario: Providing stable excitation voltage for bridge-based pressure transducers. IC Role / Device Role / Timing Role: Precision voltage reference source for ratiometric analog signal conditioning. Use Value: Low 16 Ω dynamic impedance minimizes output drift under varying sensor loading. |
| Programmable Logic Controller I/O Protection | Automotive Body Control Module Bias Network |
Use Scenario: Clamping transient overvoltage on 24 V digital input lines against MCU GPIO. IC Role / Device Role / Timing Role: Reverse-biased shunt regulator absorbing surge energy. Use Value: 1 W power rating sustains 100 ms surges up to 285 mA without degradation. | Use Scenario: Generating stable 16 V bias for CAN transceiver local regulators in 12 V systems. IC Role / Device Role / Timing Role: Zener-derived reference feeding LDO enable circuitry. Use Value: –65 °C to +150 °C operating range supports under-hood deployment requirements. |
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) instead of ±2% | Lower cost where tighter regulation not required; higher VZ spread affects feedback loop stability margin | Select when budget constraints outweigh precision needs and system tolerances allow ±5% VZ variation |
| MMSZ4705ET1G | Surface-mount SOD-123 package, same 16 V ±5%, 500 mW rating | Not drop-in compatible; requires PCB redesign; lower power derating limits sustained current | Choose only for space-constrained designs accepting reduced power capability and layout change |
Compared with 1N4745A and MMSZ4705ET1G, the 1N4745CPE3/TR8 delivers superior voltage accuracy and higher power handling in an axial-leaded through-hole format ideal for prototyping, industrial power supplies, and legacy-replacement scenarios.
Availability
1N4745CPE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, sensor reference circuits, and automotive body electronics requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4745CPE3/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, RF, and discrete components for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed specifically for robust, cost-effective voltage regulation in harsh-environment power systems where reliability, thermal stability, and JEDEC-standard compatibility are critical.
FAQ
What is the Zener voltage tolerance of the 1N4745CPE3/TR8?
The 1N4745CPE3/TR8 has a ±2% Zener voltage tolerance, confirmed by the "C" suffix in its part number per Microsemi's documentation. This means its nominal 16 V Zener voltage is guaranteed between 15.68 V and 16.32 V at 15.5 mA test current and 25 °C lead temperature. This tighter tolerance supports higher-accuracy regulation than standard ±5% variants like the 1N4745A.
Is the 1N4745CPE3/TR8 RoHS compliant?
Yes, the 1N4745CPE3/TR8 is RoHS compliant, as indicated by the "e3" suffix in its full part number. Microsemi specifies that the "e3" denotes RoHS-compliant annealed matte-tin plating on the DO-41 leads, fully satisfying EU Directive 2011/65/EU requirements without lead or other restricted substances.
What does the "TR8" suffix mean in 1N4745CPE3/TR8?
The "TR8" suffix indicates tape-and-reel packaging per EIA-296 standard, with 8 mm carrier tape and 1,000 units per reel. This format enables automated pick-and-place assembly and is distinct from bulk or ammo-pack options. The base device remains identical electrically and mechanically to non-TR variants.
What is the maximum continuous Zener current for the 1N4745CPE3/TR8 at room temperature?
At TA = 25 °C, the 1N4745CPE3/TR8 supports a maximum continuous Zener current of 285 mA, derived from its 1.0 W power rating and 16 V nominal voltage (IZM = PZ / VZ ≈ 1000 mW / 16 V). This value is confirmed in the Electrical Characteristics table under "MAXIMUM REGULATOR CURRENT (IZM) TA = 50°C", with derating applied linearly above 50 °C.
Can the 1N4745CPE3/TR8 be used in surface-mount designs?
No, the 1N4745CPE3/TR8 uses a DO-41 axial-leaded package and is not suitable for surface-mount assembly. For SMT equivalents, Microsemi offers the SMAJ4745A (SMA package) and MLL4745A (SOD-123), though these differ in power rating, thermal performance, and footprint. Board redesign is required to substitute any SMT variant for the 1N4745CPE3/TR8.
1N4745CPE3/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)
1N4745CPE3/TR8 FAQ
1.How can I place an order for 1N4745CPE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4745CPE3/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 1N4745CPE3/TR8 reliable?
The price and inventory of 1N4745CPE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4745CPE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4745CPE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4745CPE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4745CPE3/TR8?
1N4745CPE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4745CPE3/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 1N4745CPE3/TR8?
For technical support, including 1N4745CPE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4745CPE3/TR8 requirements.
6.How does Aetrix verify that 1N4745CPE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4745CPE3/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 1N4745CPE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4745CPE3/TR8?
All 1N4745CPE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4745CPE3/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 1N4745CPE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4745CPE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4745CPE3/TR8 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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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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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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