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Microchip Technology 1N4746CE3/TR13
- Part No.:
- 1N4746CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4746CE3/TR13.pdf
- Description:
- DIODE ZENER 18V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,272
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Product details
Overview
1N4746CE3/TR13 from Microsemi is a 1 W, 18 V ±2% tolerance silicon Zener diode in DO-41 plastic package, rated for 14 mA test current, 20 Ω dynamic impedance at IZT, and 5 µA reverse leakage at 13.7 V, used for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4746CE3/TR13 datasheet, 1N4746CE3/TR13 pinout, 1N4746CE3/TR13 application, or 1N4746CE3/TR13 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (45 °C/W junction-to-lead), surge current rating (250 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging per EIA-296.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable output voltage across varying load and line conditions. Its 18 V nominal Zener voltage exhibits a positive temperature coefficient above ~5 V, with typical TC of +4.5 mV/°C per Figure 3 in the datasheet.
Designed for axial-lead mounting on FR4 PCBs, it delivers 1.0 W steady-state dissipation at lead temperature <105 °C or ambient <45 °C, with thermal resistance of 105 °C/W junction-to-ambient under defined copper pad conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V ±2% at 14 mA - ensures tight regulation stability for reference circuits requiring <0.4 V deviation over production lot |
| Power Dissipation | 1.0 W at TL < 105 °C - supports continuous operation in compact power supplies without forced cooling |
| Dynamic Impedance (ZZT) | 20 Ω at IZT = 14 mA - limits output voltage variation to ≤280 mV for ±14 mA load transients |
| Reverse Leakage Current | 5 µA max at VR = 13.7 V - enables low-quiescent-current bias networks in battery-powered systems |
| Surge Current (ISM) | 250 mA (½-sine, 1/120 s) - withstands transient overvoltage events without degradation |
| Thermal Resistance | 45 °C/W junction-to-lead (3/8″ lead length) - allows accurate thermal modeling for reliability prediction |
| Operating Temperature | –65 °C to +150 °C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by color band; terminals are non-polarized leads for through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; connected to unregulated input to deliver regulated 18 V to load |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables tighter output regulation than standard ±5% parts, reducing need for post-regulation trimming |
| RoHS-compliant matte-tin plating (e3 suffix) | Meets lead-free soldering requirements with proven wetting performance per MIL-STD-750 Method 2026 |
| Moisture sensitivity Level 1 (J-STD-020B) | Eliminates dry-pack requirement and floor-life constraints, simplifying SMT assembly logistics |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands handling without special static controls, lowering manufacturing defect risk |
| Tape-and-reel packaging (TR13 suffix) | Supports automated pick-and-place insertion at volume production rates |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or op-amp-based shunt regulators. IC Role / Device Role / Timing Role: Provides precise 18 V reference point for error amplifier comparison. Use Value: Maintains output accuracy within ±0.36 V over temperature and line variations due to ±2% tolerance and low ZZT. | Use Scenario: Protecting downstream logic inputs from transient voltage spikes exceeding 18 V. IC Role / Device Role / Timing Role: Acts as crowbar element that conducts heavily above 18 V to divert surge energy. Use Value: Limits clamped voltage to ≤18.5 V under 250 mA surge, preventing latch-up in 16 V-rated CMOS devices. |
| Signal Level Shifting | Current Source Bias |
Use Scenario: Generating fixed DC offset for analog sensor outputs before ADC sampling. IC Role / Device Role / Timing Role: Supplies stable bias voltage to op-amp summing junctions. Use Value: Delivers <1 mV drift over 0–70 °C range, enabling 12-bit measurement repeatability. | Use Scenario: Setting constant current for LED driver or transistor bias networks. IC Role / Device Role / Timing Role: Forms stable voltage reference for emitter-degenerated current mirror. Use Value: Enables 1% current matching across units using matched resistors and 1N4746CE3/TR13's tight VZ tolerance. |
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) and no RoHS compliance (Sn/Pb plating) | Acceptable where cost sensitivity outweighs precision or environmental compliance requirements | Select only if legacy Sn/Pb assembly process is used and ±5% regulation error is acceptable |
| MMSZ4706T1G | Surface-mount SOD-123 package, same 18 V ±5%, 500 mW rating, higher ZZT (40 Ω) | Used in space-constrained PCBs where DO-41 footprint is prohibitive | Choose when board area is limited and 0.5 W power rating suffices for the application |
Compared with 1N4746A and MMSZ4706T1G, the 1N4746CE3/TR13 offers superior voltage precision (±2% vs ±5%), full RoHS compliance, and higher power handling (1 W vs 0.5 W), making it optimal for high-reliability, environmentally regulated, and thermally demanding designs.
Availability
1N4746CE3/TR13 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and signal level shifting applications requiring stable component supply and long-term obsolescence management.
Supply support for 1N4746CE3/TR13 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 engineered for ruggedized voltage regulation in mission-critical power systems, emphasizing thermal robustness, ESD immunity, and moisture resilience in harsh operating environments.
FAQ
What is the Zener voltage tolerance of the 1N4746CE3/TR13?
The 1N4746CE3/TR13 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in the part number. This means its measured breakdown voltage at 14 mA test current falls between 17.64 V and 18.36 V at 25 °C, enabling tighter regulation than standard ±5% variants like the 1N4746A.
Does the 1N4746CE3/TR13 meet RoHS requirements?
Yes, the 1N4746CE3/TR13 meets RoHS requirements, confirmed by the "e3" suffix indicating RoHS-compliant annealed matte-tin plating. It is qualified per JEDEC J-STD-020B Level 1 moisture sensitivity and requires no dry pack prior to assembly.
What is the maximum surge current rating for the 1N4746CE3/TR13?
The 1N4746CE3/TR13 has a maximum non-repetitive surge current (ISM) rating of 250 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating applies to transient overvoltage events such as ESD or inductive switching spikes.
Can the 1N4746CE3/TR13 be used in surface-mount designs?
No, the 1N4746CE3/TR13 uses a DO-41 axial-leaded package intended for through-hole mounting. For surface-mount alternatives, consider the SMAJ4746A or MLL4746A series - both share the same 18 V Zener voltage but differ in package, power rating, and thermal characteristics.
What is the thermal resistance junction-to-lead for the 1N4746CE3/TR13?
The thermal resistance junction-to-lead for the 1N4746CE3/TR13 is 45 °C/W when measured at 3/8″ (10 mm) lead length from the body. This value enables accurate junction temperature estimation under DC bias and supports thermal derating calculations per Figure 1 in the Microsemi datasheet.
1N4746CE3/TR13 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)
1N4746CE3/TR13 FAQ
1.How can I place an order for 1N4746CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4746CE3/TR13 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 1N4746CE3/TR13 reliable?
The price and inventory of 1N4746CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4746CE3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N4746CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4746CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4746CE3/TR13?
1N4746CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4746CE3/TR13 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 1N4746CE3/TR13?
For technical support, including 1N4746CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4746CE3/TR13 requirements.
6.How does Aetrix verify that 1N4746CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N4746CE3/TR13 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 1N4746CE3/TR13 meets industry standards.
7.What is the process for return or replacement of 1N4746CE3/TR13?
All 1N4746CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4746CE3/TR13, 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 1N4746CE3/TR13 part is unused and in its original packaging.
Return procedure for 1N4746CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4746CE3/TR13 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
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SMAZ12-13-F
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