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Microchip Technology 1N4746CPE3/TR8
- Part No.:
- 1N4746CPE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4746CPE3/TR8.pdf
- Description:
- DIODE ZENER 18V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:8,607
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Product details
Overview
1N4746CPE3/TR8 from Microsemi is a 1 W, 18 V ±2% tolerance silicon Zener diode in DO-41 plastic package, rated for 14 mA test current, 50 Ω dynamic impedance at IZT, and 250 mA maximum regulator current at TA = 50°C. It provides precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4746CPE3/TR8 datasheet, 1N4746CPE3/TR8 pinout, 1N4746CPE3/TR8 application, or 1N4746CPE3/TR8 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (45°C/W junction-to-lead), surge current rating (250 mA), RoHS compliance (e3 suffix), and tape-and-reel packaging (TR8 suffix).
Technical Context
This device operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its 18 V nominal Zener voltage exhibits a positive temperature coefficient above ~5 V, with typical TC of +5.5 mV/°C per Figure 3.
The DO-41 package enables axial-leaded through-hole mounting with flexible PCB layout options. Thermal performance is defined at 3/8" lead length (45°C/W) or on FR4 board (105°C/W), supporting reliable operation from –65°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V ±2% at IZT = 14 mA - ensures tight regulation stability for reference designs |
| Power Dissipation | 1.0 W at TL < 105°C - defines maximum continuous DC power handling |
| Dynamic Impedance | 50 Ω at IZT = 14 mA - determines output voltage variation under load changes |
| Max Regulator Current | 250 mA at TA = 50°C - sets upper limit for sustained Zener conduction |
| Reverse Leakage | 5 μA at VR = 13.7 V - confirms low standby current in non-conducting state |
| Thermal Resistance | 45°C/W junction-to-lead - enables thermal design with standard lead length |
| Operating Temperature | –65°C to +150°C - supports industrial and automotive ambient environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by band; banded end must be held positive relative to anode for Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink in forward bias; reference node in Zener mode | Connected to lower-potential rail during regulation |
| Cathode | Current source in Zener breakdown; regulated output node | Banded terminal; connected to higher-potential rail or load return |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables high-accuracy voltage references without external trimming |
| RoHS-compliant matte-tin plating (e3 suffix) | Supports lead-free reflow soldering per JEDEC J-STD-020B Level 1 |
| Tape-and-reel packaging (TR8 suffix) | Enables automated pick-and-place assembly for high-volume production |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and ESD protection circuit overhead |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete op-amp-based regulators. IC Role / Device Role / Timing Role: Provides precise 18 V reference point for error amplifier comparison. Use Value: Maintains ±2% output accuracy across temperature and line variations due to tight VZ tolerance and low ZZT. | Use Scenario: Protecting downstream logic inputs from transient overvoltage events exceeding 18 V. IC Role / Device Role / Timing Role: Shunts excess current when input voltage exceeds 18 V + Zener knee voltage. Use Value: Limits clamping voltage to ≤18.4 V (at IZK = 0.25 mA) with fast response and no external bias required. |
| Signal Level Translation | Current Source Bias |
Use Scenario: Converting 24 V industrial sensor outputs to 18 V logic-compatible levels. IC Role / Device Role / Timing Role: Acts as passive shunt regulator to clamp and scale analog signal peaks. Use Value: Delivers predictable 18 V ceiling with 50 Ω dynamic impedance, minimizing signal distortion during clipping. | Use Scenario: Establishing stable bias current for transistor amplifiers or LED drivers. IC Role / Device Role / Timing Role: Serves as constant-voltage element in emitter-degenerated current mirror configurations. Use Value: Enables <1% current drift over –40°C to +85°C using matched transistors and 18 V reference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4746A | Same 18 V nominal, but ±5% tolerance (A suffix) vs. ±2% (C suffix) | Lower accuracy reference; suitable where cost outweighs precision | Select 1N4746A only if ±5% VZ meets system tolerance budget |
| BZX55C18 | Same 18 V ±2%, but 500 mW rating and DO-35 package | Not interchangeable in 1 W thermal designs; requires derating or heatsinking | Choose BZX55C18 only for space-constrained, low-power applications with adequate thermal margin |
Compared with 1N4746A and BZX55C18, the 1N4746CPE3/TR8 delivers tighter voltage control in high-power, thermally demanding roles while maintaining full compatibility with DO-41 footprint and tape-and-reel automation.
Availability
1N4746CPE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and medical instrumentation requiring stable component supply and long-term lifecycle continuity.
Supply support for 1N4746CPE3/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 1N47xx series was designed specifically for precision voltage regulation in ruggedized, high-stability power systems where long-term parameter drift and thermal robustness are critical.
FAQ
What is the Zener voltage tolerance of the 1N4746CPE3/TR8?
The 1N4746CPE3/TR8 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in the part number. This means its nominal 18 V Zener voltage falls within 17.64 V to 18.36 V at IZT = 14 mA and TL = 25°C. This tighter tolerance supports high-accuracy reference applications compared to the ±5% 1N4746A variant.
Does the 1N4746CPE3/TR8 require dry packing before PCB assembly?
No, the 1N4746CPE3/TR8 does not require dry packing. It is moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored and handled indefinitely at ambient conditions without baking or humidity-controlled packaging prior to reflow soldering.
What is the maximum steady-state power dissipation for the 1N4746CPE3/TR8?
The 1N4746CPE3/TR8 is rated for 1.0 W steady-state power dissipation at lead temperature (TL) < 105°C with 3/8" (10 mm) lead length from the body. Derating is required above this temperature per Figure 1 in the datasheet, reaching zero power at TL = 175°C.
Is the 1N4746CPE3/TR8 compatible with lead-free reflow processes?
Yes, the 1N4746CPE3/TR8 features RoHS-compliant annealed matte-tin plating (e3 suffix) and is qualified for lead-free reflow soldering at 260°C for 10 seconds maximum, meeting MIL-STD-750 Method 2026 requirements.
What does the "TR8" suffix indicate in 1N4746CPE3/TR8?
"TR8" indicates tape-and-reel packaging per EIA-296 standard, with 8 mm carrier tape width and 1,000 units per reel. This format supports automated surface-mount and through-hole placement equipment, enabling high-throughput manufacturing of the 1N4746CPE3/TR8.
1N4746CPE3/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):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 13.7 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)
1N4746CPE3/TR8 FAQ
1.How can I place an order for 1N4746CPE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4746CPE3/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 1N4746CPE3/TR8 reliable?
The price and inventory of 1N4746CPE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4746CPE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4746CPE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4746CPE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4746CPE3/TR8?
1N4746CPE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4746CPE3/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 1N4746CPE3/TR8?
For technical support, including 1N4746CPE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4746CPE3/TR8 requirements.
6.How does Aetrix verify that 1N4746CPE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4746CPE3/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 1N4746CPE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4746CPE3/TR8?
All 1N4746CPE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4746CPE3/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 1N4746CPE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4746CPE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4746CPE3/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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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
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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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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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