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Microchip Technology 1N4742CP/TR8
- Part No.:
- 1N4742CP/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4742CP/TR8.pdf
- Description:
- DIODE ZENER 12V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,510
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Product details
Overview
1N4742CP/TR8 from Microsemi is a 12 V, 5% 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 provides stable voltage reference and overvoltage protection in linear power supplies and analog signal conditioning circuits.
For engineers reviewing the 1N4742CP/TR8 datasheet, 1N4742CP/TR8 pinout, 1N4742CP/TR8 application, or 1N4742CP/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (45 °C/W junction-to-lead), surge current rating (380 mA), operating temperature range (–65 °C to +150 °C), and RoHS-compliant "e3" plating with tape-and-reel packaging (TR8).
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 5% voltage tolerance (A-suffix), 76 Ω dynamic impedance at 21 mA, and –65 °C to +150 °C operating range support robust regulation in unregulated DC rails and feedback networks.
The DO-41 axial-leaded plastic package delivers 45 °C/W junction-to-lead thermal resistance at 10 mm lead length and supports 1.0 W steady-state dissipation below 105 °C lead temperature. Polarity is marked by cathode band; operation requires cathode-positive bias relative to anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±5% - defines nominal regulation point under 21 mA test current |
| Test Current (IZT) | 21 mA - establishes specified VZ and dynamic impedance measurement condition |
| Dynamic Impedance (ZZT) | 76 Ω @ IZT - indicates small-signal AC resistance affecting regulation stability |
| Max Reverse Leakage (IR) | 5 μA @ 9.1 V - ensures low standby power loss in high-impedance bias networks |
| Power Dissipation | 1.0 W @ TL < 105 °C - sets maximum continuous DC power handling at defined lead temp |
| Surge Current (ISM) | 380 mA - supports transient overvoltage clamping without failure (½-sine, 1/120 s) |
| Operating Temp Range | –65 °C to +150 °C - enables use in automotive under-hood and industrial control environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by colored band; anode and cathode terminals are non-polarized for mounting but require cathode-positive bias during Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased input terminal | Connected to lower-potential node; carries reverse current during regulation |
| Cathode | Regulated output terminal | Banded end; held at stable 12 V above anode when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N47xxA compliance | Guarantees mechanical and electrical interchangeability per industry standard |
| RoHS-compliant "e3" plating | Matte-tin termination compatible with lead-free reflow and wave soldering processes |
| Tape-and-reel packaging (TR8) | Standard EIA-296 format enabling automated SMT placement despite axial-leaded form factor |
| Moisture sensitivity Level 1 | No dry-pack required - simplifies handling and eliminates bake-out prior to assembly |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - withstands typical handling ESD events without parameter shift |
Applications
| Linear Power Supply Regulation | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing unregulated +15 V DC rail feeding op-amp bias networks in industrial sensor interfaces. IC Role / Device Role / Timing Role: Zener diode providing fixed 12 V reference to shunt excess current and hold output within ±5%. Use Value: Maintains 12 V ±0.6 V across 5–30 mA load variation using only passive components and 1 W dissipation margin. | Use Scenario: Protecting microcontroller I/O pins from 24 V transients induced on shared field wiring. IC Role / Device Role / Timing Role: Clamping device limiting voltage to 12.6 V (VZ + ΔVZ at ISM) during surge events. Use Value: Absorbs 380 mA surge pulses without degradation, preventing latch-up or gate oxide damage. |
| Reference Voltage Source | Current Source Biasing |
Use Scenario: Generating precision bias for differential amplifier input stages in medical-grade analog front-ends. IC Role / Device Role / Timing Role: Stable 12 V reference establishing common-mode voltage for matched transistor pairs. Use Value: Delivers <10 mV drift over –40 °C to +85 °C due to low tempco and tight 5% tolerance. | Use Scenario: Setting constant current for LED driver bias in HVAC status indicators. IC Role / Device Role / Timing Role: Zener-based current source where cathode feeds base of PNP transistor. Use Value: Enables 1.2 mA ±6% current setpoint using single resistor and 1N4742CP/TR8, minimizing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | No "P" suffix → glass-body DO-35 package; higher thermal resistance (105 °C/W vs. 45 °C/W) | Lower power density; unsuitable for high ambient or high-current regulation | Select 1N4742CP/TR8 for plastic DO-41, better thermal performance, and tape-and-reel automation |
| MMSZ4702T1G | Surface-mount SOD-123; 12 V, 5%, 500 mW; 30 Ω ZZT @ 1 mA; smaller footprint, lower power | Not drop-in; requires PCB redesign; limited surge capability (200 mA) | Choose MMSZ4702T1G only for space-constrained, low-power SMT designs where 1 W dissipation is unnecessary |
Compared with 1N4742A and MMSZ4702T1G, the 1N4742CP/TR8 offers superior thermal management in through-hole layouts, full 1 W power handling with robust surge rating, and factory-verified tape-and-reel compatibility-making it optimal for industrial power supply and protection modules requiring long-term reliability and automated assembly.
Availability
1N4742CP/TR8 is available at Aetrix Electronics and suitable for linear power supplies, overvoltage protection circuits, reference voltage sources, and current-source biasing applications requiring stable component supply and JEDEC-standard interchangeability.
Supply support for 1N4742CP/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 1N47xxAP series was designed specifically for general-purpose voltage regulation in cost-sensitive, high-volume industrial and commercial power systems where JEDEC compatibility, thermal robustness, and RoHS compliance are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N4742CP/TR8?
The 1N4742CP/TR8 has a ±5% Zener voltage tolerance, confirmed by the "A" suffix in its part number per Microsemi's documentation. This means its nominal 12 V regulation point falls between 11.4 V and 12.6 V at 21 mA test current and 25 °C lead temperature. The tolerance remains valid across its full operating temperature range of –65 °C to +150 °C, supporting predictable performance in harsh environments.
Does the 1N4742CP/TR8 support automated assembly?
Yes, the 1N4742CP/TR8 includes the "TR8" suffix indicating EIA-296 standard tape-and-reel packaging, enabling direct use in pick-and-place machines despite its axial-leaded DO-41 form factor. The reel contains 8,000 units, and the carrier tape meets industry-standard pitch and pocket dimensions-eliminating manual loading or custom feeders for high-volume production of 1N4742CP/TR8-based boards.
What is the maximum surge current rating for the 1N4742CP/TR8?
The 1N4742CP/TR8 is rated for a maximum surge current (ISM) of 380 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating allows the 1N4742CP/TR8 to safely clamp short-duration transients-such as inductive kickback or ESD-induced spikes-without parametric shift or catastrophic failure, making it suitable for ruggedized overvoltage protection circuits.
How does the thermal resistance of the 1N4742CP/TR8 compare to glass-body variants?
The 1N4742CP/TR8 features a plastic DO-41 package with 45 °C/W junction-to-lead thermal resistance at 10 mm lead length, significantly lower than the 105 °C/W of glass-body DO-35 versions like the 1N4742A. This 57% improvement enables higher continuous power delivery at the same lead temperature, reduces thermal stress in dense layouts, and extends reliability in sustained 1 W operation-key for industrial power supply designs using the 1N4742CP/TR8.
Is the 1N4742CP/TR8 RoHS compliant?
Yes, the "e3" suffix in 1N4742CP/TR8 explicitly denotes RoHS compliance per Microsemi's documentation, with annealed matte-tin plating that meets lead-free soldering requirements. The device passes JEDEC J-STD-020B moisture sensitivity Level 1 qualification, requires no dry-packaging, and is qualified for reflow profiles up to 260 °C for 10 seconds-ensuring full compatibility with modern eco-conscious manufacturing processes for the 1N4742CP/TR8.
1N4742CP/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):
- 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)
1N4742CP/TR8 FAQ
1.How can I place an order for 1N4742CP/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4742CP/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 1N4742CP/TR8 reliable?
The price and inventory of 1N4742CP/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4742CP/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4742CP/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4742CP/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4742CP/TR8?
1N4742CP/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4742CP/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 1N4742CP/TR8?
For technical support, including 1N4742CP/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4742CP/TR8 requirements.
6.How does Aetrix verify that 1N4742CP/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4742CP/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 1N4742CP/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4742CP/TR8?
All 1N4742CP/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4742CP/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 1N4742CP/TR8 part is unused and in its original packaging.
Return procedure for 1N4742CP/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4742CP/TR8 Tags
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Diodes Incorporated
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