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Microchip Technology 1N4742P/TR12
- Part No.:
- 1N4742P/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4742P/TR12.pdf
- Description:
- DIODE ZENER 12V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,932
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Product details
Overview
1N4742P/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 reverse test voltage (VR) at 5 μA leakage. It regulates voltage in power supply reference and overvoltage protection circuits across -65°C to +150°C.
For engineers reviewing the 1N4742P/TR12 datasheet, 1N4742P/TR12 pinout, 1N4742P/TR12 application, or 1N4742P/TR12 equivalent, key selection factors include Zener voltage tolerance, thermal resistance (45°C/W junction-to-lead), surge current rating (380 mA), RoHS-compliant "e3" plating option, and tape-and-reel packaging (TR12).
Technical Context
This axial-leaded Zener operates in reverse breakdown to maintain stable voltage under varying load and temperature. Its 12 V nominal Zener voltage (VZ) is specified at 21 mA IZT with ±5% tolerance (A suffix), and exhibits 76 Ω dynamic impedance at that current-critical for low-noise regulation stability.
Thermal performance is defined by 45°C/W junction-to-lead resistance at 10 mm lead length, enabling reliable 1 W dissipation up to 105°C lead temperature. The cathode band polarity marking and tin-lead or matte-tin plating ensure compatibility with standard soldering profiles (260°C/10 s).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±5% at 21 mA - defines precise regulation point for reference circuits |
| Power Dissipation | 1.0 W at TL < 105°C - sets maximum continuous thermal load on PCB layout |
| Dynamic Impedance (ZZT) | 76 Ω @ IZT - determines output voltage variation under load transients |
| Reverse Leakage (IR) | 5 μA @ 9.1 V - ensures minimal quiescent current in standby mode |
| Surge Current (ISM) | 380 mA (½-sine, 1/120 s) - supports transient overvoltage clamping capability |
| Thermal Resistance | 45°C/W junction-to-lead - guides heatsinking and lead length design for reliability |
| Operating Temperature | -65°C to +150°C - enables use in automotive under-hood and industrial environments |
Pinout & Package
DO-41 (JEDEC DO-204AL) plastic axial-leaded package with cathode indicated by colored band; leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node during Zener operation; forward voltage ≤1.2 V @ 200 mA |
| Cathode | Banded end | Connected to higher-potential node; reverse-biased to achieve 12 V regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxA series | Ensures cross-manufacturer interchangeability and standardized test conditions |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and simplifies SMT handling logistics |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces need for special ESD controls during assembly and testing |
| RoHS-compliant "e3" option | Supports environmental compliance without derating or performance trade-offs |
| Tape-and-reel packaging (TR suffix) | Enables automated pick-and-place assembly for high-volume production |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stable 12 V reference in linear regulator feedback networks or ADC reference dividers. IC Role / Device Role / Timing Role: Voltage reference element providing precision bias point independent of input ripple. Use Value: 5% VZ tolerance and 76 Ω ZZT enable ±0.6 V regulation accuracy under 20 mA load variation. | Use Scenario: Clamping transient spikes above 12 V on microcontroller I/O lines or sensor inputs. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground during ESD or inductive kick events. Use Value: 380 mA surge rating and 9.1 V VR threshold provide robust clamping before downstream IC damage. |
| Voltage Monitor Circuit | Industrial Sensor Excitation |
Use Scenario: Detecting undervoltage or overvoltage conditions in battery-powered equipment using comparator input. IC Role / Device Role / Timing Role: Precision threshold detector via stable Zener voltage applied to comparator reference pin. Use Value: -65°C to +150°C operating range ensures reliable trip-point stability across harsh environmental conditions. | Use Scenario: Providing regulated excitation voltage to resistive bridge sensors (e.g., strain gauges) in process control systems. IC Role / Device Role / Timing Role: Low-drift voltage source maintaining constant sensor sensitivity despite supply fluctuations. Use Value: 45°C/W thermal resistance allows direct mounting on FR4 with 4 mm² copper pads for stable long-term calibration. |
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 TR12 tape-and-reel; bulk or ammo pack only; same electrical specs | Lacks automated assembly support; suitable for prototyping or low-volume hand-solder | Select 1N4742P/TR12 when SMT line integration and traceable lot control are required |
| BZX55C12 | 5% tolerance, 12 V, but 500 mW rating and higher ZZT (100 Ω); DO-35 package | Lower power handling limits use in >500 mW regulation or surge scenarios | Choose BZX55C12 only if board space constraints favor smaller DO-35 footprint and thermal load is ≤0.5 W |
Compared with 1N4742A and BZX55C12, the 1N4742P/TR12 delivers full 1 W power capability with optimized thermal resistance and factory-verified tape-and-reel packaging-making it the preferred choice for production-grade power reference and protection designs requiring reliability and manufacturability.
Availability
1N4742P/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and industrial sensor excitation requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for 1N4742P/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 general-purpose voltage regulation in cost-sensitive yet thermally demanding applications where JEDEC-standardized performance and moisture-insensitive packaging are essential.
FAQ
What is the Zener voltage tolerance of the 1N4742P/TR12?
The 1N4742P/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, ensuring predictable regulation behavior in production circuits where tight voltage references are needed without premium-cost tighter tolerances.
Does the 1N4742P/TR12 support automated assembly?
Yes, the "TR12" suffix confirms the 1N4742P/TR12 is supplied in EIA-296 standard tape-and-reel packaging compatible with high-speed pick-and-place equipment. Each reel contains 12,000 units, and the DO-41 body geometry meets industry-standard pocket pitch and cover tape specifications for reliable feeding and placement.
What is the maximum surge current rating for the 1N4742P/TR12?
The 1N4742P/TR12 is rated for a maximum non-repetitive 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 clamping in power rail protection and ESD suppression applications without permanent degradation when operated within datasheet limits.
Is the 1N4742P/TR12 RoHS compliant?
Yes, the 1N4742P/TR12 is RoHS compliant, as confirmed by the "e3" suffix in Microsemi's official documentation. It features annealed matte-tin plating on leads and void-free UL94V-0 epoxy encapsulation-meeting EU Directive 2011/65/EU requirements without performance compromise or thermal derating.
How does thermal resistance affect PCB layout for the 1N4742P/TR12?
The 1N4742P/TR12 has a junction-to-lead thermal resistance of 45°C/W at 10 mm lead length. To sustain full 1 W dissipation, PCB layout must provide adequate copper area: Microsemi specifies 4 mm² copper pads with 1 mm track width and 25 mm length on FR4 (1 oz Cu) to achieve 105°C/W junction-to-ambient resistance-guiding trace width and pad sizing decisions.
1N4742P/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)
1N4742P/TR12 FAQ
1.How can I place an order for 1N4742P/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4742P/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 1N4742P/TR12 reliable?
The price and inventory of 1N4742P/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4742P/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4742P/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4742P/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4742P/TR12?
1N4742P/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4742P/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 1N4742P/TR12?
For technical support, including 1N4742P/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4742P/TR12 requirements.
6.How does Aetrix verify that 1N4742P/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4742P/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 1N4742P/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4742P/TR12?
All 1N4742P/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4742P/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 1N4742P/TR12 part is unused and in its original packaging.
Return procedure for 1N4742P/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4742P/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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