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Microchip Technology 1N4742PE3/TR12
- Part No.:
- 1N4742PE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4742PE3/TR12.pdf
- Description:
- DIODE ZENER 12V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,246
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Product details
Overview
1N4742PE3/TR12 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 operates from –65°C to +150°C and serves as a precision voltage reference or shunt regulator in power supply feedback loops.
For engineers reviewing the 1N4742PE3/TR12 datasheet, 1N4742PE3/TR12 pinout, 1N4742PE3/TR12 application, or 1N4742PE3/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (45°C/W junction-to-lead), surge current rating (380 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR12).
Technical Context
This device functions as a shunt voltage regulator by maintaining a stable 12 V across its terminals when reverse-biased above its breakdown threshold. Its 5% voltage tolerance (A-suffix), 21 mA test current, and 76 Ω dynamic impedance ensure predictable regulation under varying load and temperature conditions.
The DO-41 axial-leaded plastic package provides 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 a cathode band; operation requires the banded end to be positive relative to the anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±5% - defines nominal regulation point with tight-enough tolerance for mid-precision feedback and reference applications |
| Test Current (IZT) | 21 mA - operating point at which VZ and ZZT are specified; sets minimum bias current for stable regulation |
| Dynamic Impedance (ZZT) | 76 Ω @ IZT - indicates small-signal AC resistance; lower values improve load regulation and ripple rejection |
| Max Reverse Leakage (IR) | 5 μA @ VR = 9.1 V - ensures low standby current in high-impedance sensing or battery-backed circuits |
| Power Dissipation | 1.0 W @ TL < 105°C - limits continuous DC power handling; derates linearly above 105°C lead temp |
| Surge Current (ISM) | 380 mA - withstands short-duration transients (½-sine, 1/120 s), critical for input protection stages |
| Thermal Resistance | 45°C/W junction-to-lead - enables thermal design using lead length as heatsink; 105°C/W junction-to-ambient on FR4 |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by a single band. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in shunt configuration | Connected to system ground or lowest potential; forms return path for Zener current |
| Cathode (banded end) | Regulated output node | Connected to voltage to be regulated; must be held positive relative to anode during operation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Industry-standard footprint and electrical behavior ensures interoperability across suppliers and legacy designs |
| RoHS-compliant "e3" suffix | Matte-tin plating meets EU RoHS Directive 2011/65/EU without lead or hazardous substances |
| Tape-and-reel packaging ("TR12") | Standard EIA-296 compliant reel format supports automated SMT placement despite axial-leaded form factor |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies handling and eliminates bake-out before assembly |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - withstands human-body-model ESD events without parameter shift or failure |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Shunt regulator providing precise 12 V reference to TL431 or optocoupler LED anode. Use Value: 5% VZ tolerance and 76 Ω ZZT enable stable loop gain and <±1% output regulation over line/load/temperature. | Use Scenario: Placed across sensitive IC inputs to clamp transient overvoltages exceeding 12 V. IC Role / Device Role / Timing Role: Voltage-limiting element diverting surge current away from downstream logic or analog circuitry. Use Value: 380 mA ISM rating and low knee impedance allow robust clamping of 100 ns–1 µs spikes without degradation. |
| Low-Power Reference Source | Industrial Sensor Excitation |
Use Scenario: Biasing precision op-amps or ADC references in battery-powered instrumentation. IC Role / Device Role / Timing Role: Stable 12 V source for ratiometric sensor bridges or reference dividers. Use Value: –65°C to +150°C operating range and 0.7 g weight support deployment in harsh or space-constrained environments. | Use Scenario: Providing excitation voltage to 4–20 mA transmitter front-ends in process control systems. IC Role / Device Role / Timing Role: Regulated supply rail for bridge sensors or current-loop drivers requiring stable headroom. Use Value: 1.0 W power rating and 45°C/W thermal resistance allow continuous operation with minimal heatsinking in sealed enclosures. |
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" (plastic) or "e3" (RoHS) suffix; glass DO-35 body, Sn/Pb plating, no tape-and-reel | Limited to non-RoHS legacy assemblies; higher thermal resistance (~60°C/W); not moisture-rated Level 1 | Select only if RoHS compliance, moisture sensitivity, or automated placement are not required |
| BZX55C12 | Same 12 V/5% spec but TO-206AA (DO-35) package; 100 Ω ZZT; 10 μA IR @ 9.1 V; no TR option | Higher dynamic impedance reduces regulation accuracy; higher leakage increases quiescent current in low-power designs | Prefer for cost-sensitive, non-automated, low-volume builds where tighter ZZT is not critical |
Compared with 1N4742A and BZX55C12, the 1N4742PE3/TR12 delivers superior thermal performance (45°C/W), guaranteed RoHS compliance, moisture-insensitive handling, and SMT-ready packaging-making it optimal for modern industrial and automotive power designs requiring reliability and manufacturability.
Availability
1N4742PE3/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, low-power reference sources, and industrial sensor excitation requiring stable component supply and full traceability.
Supply support for 1N4742PE3/TR12 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 ruggedized voltage regulation in mission-critical power systems where long-term stability, wide temperature operation, and JEDEC-standard compatibility are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N4742PE3/TR12?
The 1N4742PE3/TR12 has a nominal Zener voltage of 12 V with a ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. This tolerance is verified at 21 mA test current and 25°C lead temperature, making it suitable for applications requiring moderate regulation accuracy without tight calibration.
Does the 1N4742PE3/TR12 require dry packing before PCB assembly?
No, the 1N4742PE3/TR12 is moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it does not require dry packing or baking prior to reflow soldering. Its plastic DO-41 package is inherently resistant to moisture absorption, simplifying handling and reducing manufacturing overhead.
What is the maximum surge current rating for the 1N4742PE3/TR12?
The 1N4742PE3/TR12 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 supports transient suppression in power rails and input protection circuits without permanent parameter shift.
Can the 1N4742PE3/TR12 be used in automotive applications?
Yes, the 1N4742PE3/TR12 operates across –65°C to +150°C and is qualified for high-reliability use in automotive power modules, engine control units, and body electronics where stable 12 V regulation is needed under thermal stress and vibration.
What does the "TR12" suffix indicate in 1N4742PE3/TR12?
The "TR12" suffix denotes EIA-296 standard tape-and-reel packaging with 12,000 units per reel. This format enables automated pick-and-place assembly and ensures consistent orientation (cathode band facing same direction) for high-yield manufacturing of the 1N4742PE3/TR12.
1N4742PE3/TR12 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:
- ±10%
- 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)
1N4742PE3/TR12 FAQ
1.How can I place an order for 1N4742PE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4742PE3/TR12 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 1N4742PE3/TR12 reliable?
The price and inventory of 1N4742PE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4742PE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4742PE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4742PE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4742PE3/TR12?
1N4742PE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4742PE3/TR12 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 1N4742PE3/TR12?
For technical support, including 1N4742PE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4742PE3/TR12 requirements.
6.How does Aetrix verify that 1N4742PE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4742PE3/TR12 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 1N4742PE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4742PE3/TR12?
All 1N4742PE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4742PE3/TR12, 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 1N4742PE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4742PE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4742PE3/TR12 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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