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Microchip Technology 1N4742CE3/TR13
- Part No.:
- 1N4742CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4742CE3/TR13.pdf
- Description:
- DIODE ZENER 12V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:5,633
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Product details
Overview
1N4742CE3/TR13 from Microsemi is a 12 V, ±2% tolerance, 1 W silicon Zener diode in DO-41 plastic package, rated for 21 mA test current (IZT), 76 Ω dynamic impedance (ZZT), and 9.1 V minimum regulation voltage (VR) at 5 μA reverse leakage. It delivers stable voltage reference and overvoltage protection in power supply feedback loops and analog signal conditioning circuits.
For engineers reviewing the 1N4742CE3/TR13 datasheet, 1N4742CE3/TR13 pinout, 1N4742CE3/TR13 application, or 1N4742CE3/TR13 equivalent, key selection criteria include its tight ±2% Zener voltage tolerance (C suffix), RoHS-compliant matte-tin plating (e3 suffix), tape-and-reel packaging (TR13), and validated thermal resistance of 45 °C/W junction-to-lead at 10 mm lead length.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable 12 V reference across a wide current range (0.25 mA to 380 mA). Its 76 Ω dynamic impedance at 21 mA ensures low output variation under load transients, while the 0.25 mA maximum knee current (IZK) enables reliable regulation even at low bias currents.
The device features a cathode band marking, axial-leaded DO-41 package with UL94V-0 epoxy body, and is moisture-sensitive Level 1 per J-STD-020B-no dry pack required. It is rated for -65 °C to +150 °C operation and withstands 260 °C soldering for 10 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±2% - precise reference for feedback networks requiring tight regulation accuracy |
| Test Current (IZT) | 21 mA - operating point where VZ and ZZT are specified; design target for stable biasing |
| Dynamic Impedance (ZZT) | 76 Ω @ IZT - low AC impedance ensures minimal output voltage shift during current ripple |
| Max Reverse Leakage (IR) | 5 μA @ 9.1 V - guarantees low standby power loss in high-impedance sensing paths |
| Power Dissipation | 1.0 W @ TL < 105 °C - supports continuous operation in compact PCB layouts with adequate lead heatsinking |
| Thermal Resistance | 45 °C/W junction-to-lead - enables thermal design using standard 10 mm lead length from body |
| Operating Temperature | -65 °C to +150 °C - suitable for industrial and automotive under-hood environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by a colored band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse-biased during regulation |
| Cathode | Zener regulation output / voltage reference node | Banded end; connected to regulated voltage rail; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables precision feedback without external trimming in 12 V SMPS and LDO reference paths |
| RoHS-compliant matte-tin plating (e3 suffix) | Ensures lead-free assembly compatibility and long-term solderability without Sn whisker risk |
| Tape-and-reel packaging (TR13 suffix) | Supports automated SMT placement despite axial form factor via carrier tape indexing |
| Level 1 moisture sensitivity (J-STD-020B) | Eliminates baking requirement before reflow, reducing manufacturing overhead and handling risk |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Permits safe handling in standard workstations without special grounding protocols |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Zener reference diode providing stable 12 V threshold to TL431 shunt regulator or optocoupler LED drive circuit. Use Value: ±2% tolerance ensures output stays within ±3% over line/load/temperature, meeting Class II safety standards. | Use Scenario: Protecting microcontroller I/O pins from transient voltage spikes on sensor input lines. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage to 12.24 V (VZ max) before damage occurs to downstream CMOS inputs. Use Value: 1 W power rating absorbs 100 ms surges up to 380 mA without degradation, per JEDEC surge test conditions. |
| Industrial Analog Signal Conditioning | Reference Voltage Source for ADC |
Use Scenario: Biasing op-amp input stages in 4–20 mA transmitter circuits requiring stable common-mode voltage. IC Role / Device Role / Timing Role: Precision 12 V reference establishing fixed offset for current-loop scaling and zero calibration. Use Value: 76 Ω dynamic impedance minimizes error contribution (<0.1% FS) when sourcing ≤1 mA to op-amp bias networks. | Use Scenario: Providing excitation voltage to resistive bridge sensors (e.g., strain gauges) feeding 12-bit SAR ADCs. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing higher-cost bandgap references where ±2% absolute accuracy suffices. Use Value: -65 °C to +150 °C operating range supports outdoor instrumentation enclosures without active temperature control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | Same 12 V ±5% tolerance, no e3 or TR suffix; Sn/Pb plating; bulk packaging | Lacks RoHS compliance and tape-and-reel; requires manual loading or vibration feeders | Select when legacy Pb-based assembly or cost-sensitive non-RoHS programs apply |
| BZX55C12 | 12 V ±5%, DO-35 glass package, 500 mW rating, 100 Ω ZZT @ 5 mA | Lower power and higher impedance limit use to low-current references (<5 mA); not suitable for 1 W clamping | Choose only for space-constrained designs where 500 mW dissipation and ±5% tolerance are acceptable |
Compared with 1N4742A and BZX55C12, the 1N4742CE3/TR13 offers tighter ±2% tolerance, full 1 W capability, RoHS compliance, and automated assembly readiness-making it optimal for modern industrial power and protection designs requiring precision and manufacturability.
Availability
1N4742CE3/TR13 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial analog signal conditioning requiring stable component supply and consistent parametric performance across production batches.
Supply support for 1N4742CE3/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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N47xx series was designed specifically for robust, low-cost voltage regulation in power conversion and protection applications-emphasizing thermal stability, wide temperature operation, and JEDEC-standardized parametric consistency.
FAQ
What is the Zener voltage tolerance of the 1N4742CE3/TR13?
The 1N4742CE3/TR13 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in the part number. This means its nominal 12 V Zener voltage is guaranteed between 11.76 V and 12.24 V at 21 mA test current and 25 °C lead temperature. This tighter tolerance supports precision regulation where ±5% variants like the 1N4742A would introduce excessive output variation.
Does the 1N4742CE3/TR13 meet RoHS requirements?
Yes, the 1N4742CE3/TR13 meets RoHS requirements, confirmed by the "e3" suffix indicating RoHS-compliant annealed matte-tin plating on its axial leads. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and is qualified per EU Directive 2011/65/EU and amendments.
What package type does the 1N4742CE3/TR13 use?
The 1N4742CE3/TR13 uses the DO-41 (JEDEC DO-204AL) axial-leaded plastic package. It features a void-free UL94V-0 thermosetting epoxy body, cathode band marking, and 0.7 g typical weight. The package supports manual through-hole insertion or automated tape-and-reel placement via the TR13 suffix configuration.
What is the maximum steady-state power dissipation for the 1N4742CE3/TR13?
The 1N4742CE3/TR13 has a maximum steady-state power dissipation of 1.0 W at lead temperature (TL) below 105 °C with 10 mm lead length from body, or at ambient temperature (TA) below 45 °C when mounted on FR4 with specified copper pads. Derating is required above these temperatures per Figure 1 in the Microsemi datasheet.
How is polarity identified on the 1N4742CE3/TR13?
Polarity on the 1N4742CE3/TR13 is identified by a cathode band printed on the body near one lead end. For proper Zener regulation, the banded (cathode) end must be held positive relative to the unbanded (anode) end. Forward voltage is ≤1.2 V at 200 mA; reverse operation outside the Zener region risks exceeding maximum ratings.
1N4742CE3/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):
- 12 V
- Tolerance:
- ±2%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 9 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 9.1 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)
1N4742CE3/TR13 FAQ
1.How can I place an order for 1N4742CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4742CE3/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 1N4742CE3/TR13 reliable?
The price and inventory of 1N4742CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4742CE3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N4742CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4742CE3/TR13 transactions.
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4.How is shipping managed for 1N4742CE3/TR13?
1N4742CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4742CE3/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 1N4742CE3/TR13?
For technical support, including 1N4742CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4742CE3/TR13 requirements.
6.How does Aetrix verify that 1N4742CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N4742CE3/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 1N4742CE3/TR13 meets industry standards.
7.What is the process for return or replacement of 1N4742CE3/TR13?
All 1N4742CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4742CE3/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 1N4742CE3/TR13 part is unused and in its original packaging.
Return procedure for 1N4742CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4742CE3/TR13 Tags
-
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
-
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
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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