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Microchip Technology 1N4742E3/TR13
- Part No.:
- 1N4742E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4742E3/TR13.pdf
- Description:
- DIODE ZENER 12V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,225
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Product details
Overview
1N4742E3/TR13 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 current - used for precision voltage reference and overvoltage protection in linear power supplies and analog signal conditioning circuits.
For engineers reviewing the 1N4742E3/TR13 datasheet, 1N4742E3/TR13 pinout, 1N4742E3/TR13 application, or 1N4742E3/TR13 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 (TR13) for automated assembly.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. It features a sharp knee in the I-V curve (verified by ZZK ≤ 1.0 Ω at IZK = 0.25 mA) and low temperature coefficient near zero at 12 V, enabling predictable regulation from –65 °C to +150 °C.
Designed for axial-lead mounting with cathode band polarity marking, it delivers 1.0 W steady-state dissipation at TL < 105 °C (3/8″ lead length) or TA < 45 °C on FR4 board, with thermal resistance of 105 °C/W junction-to-ambient under standard PCB layout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±5% at IZT = 21 mA - defines nominal regulation point with tight production control |
| Power Dissipation | 1.0 W at TL < 105 °C - sets maximum continuous thermal load without derating |
| Dynamic Impedance | 76 Ω at IZT - determines output voltage variation under load current changes |
| Reverse Leakage | 5 μA max at VR = 9.1 V - ensures minimal quiescent current in standby regulation |
| Surge Current (ISM) | 380 mA peak (½-sine, 1/120 s) - supports transient overvoltage clamping capability |
| Thermal Resistance | 45 °C/W junction-to-lead - enables direct thermal path to PCB copper or heatsink via leads |
| Operating Temp | –65 °C to +150 °C - validated for industrial and automotive under-hood environments |
Pinout & Package
DO-41 (JEDEC DO-204AL) plastic axial-leaded package with void-free UL94V-0 epoxy body, tin-lead or RoHS-compliant matte-tin plating, cathode indicated by colored band. Leads are 0.032" diameter, 10 mm length from body, suitable for through-hole soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node; reverse-biased during regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Banded end; connected to higher-potential node to enable regulation |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant "e3" suffix | Matte-tin plating per MIL-STD-750 Method 2026, eliminating lead-based solder compatibility concerns |
| Tape-and-reel packaging (TR13) | EIA-296 compliant carrier tape, enabling high-speed pick-and-place placement |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies handling and storage |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD controls in assembly |
| Plastic P-suffix construction | Lower thermal resistance vs. glass-body G-suffix variants - improves power handling reliability |
Applications
| Linear Power Supply Regulation | Analog Signal Clamping |
|---|---|
Use Scenario: Stabilizing unregulated DC outputs in transformer-rectifier-filter supplies for op-amp biasing and sensor excitation. IC Role / Device Role / Timing Role: Voltage reference element providing fixed 12 V rail independent of input ripple or load variation. Use Value: Maintains 12 V ±0.6 V over 1–100 mA load range and –40 °C to +85 °C ambient, reducing need for active regulation. | Use Scenario: Limiting analog input voltage swings to protect ADC front-ends or op-amp inputs from overvoltage damage. IC Role / Device Role / Timing Role: Bidirectional clamp (forward + reverse) with 1.2 V forward drop and 12 V reverse breakdown. Use Value: Limits transients to ≤12.6 V while drawing <5 μA leakage below 9.1 V - preserves signal integrity and prevents latch-up. |
| Industrial Sensor Excitation | Overvoltage Protection Circuit |
Use Scenario: Providing stable excitation voltage to resistive bridge sensors (e.g., strain gauges, RTDs) in PLC I/O modules. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source referenced to system ground. Use Value: Delivers 12 V ±0.6 V with <100 ppm/°C tempco near 12 V - minimizes measurement error due to supply drift. | Use Scenario: Shunting surge energy from 12 V bus lines during load dump or inductive switching events. IC Role / Device Role / Timing Role: Transient voltage suppressor operating in Zener breakdown mode. Use Value: Absorbs 380 mA peak surge (1/120 s) without degradation - protects downstream regulators and microcontrollers. |
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 "e3" RoHS suffix; Sn/Pb plating; same VZ, IZT, ZZT, and package | Not suitable for lead-free assembly; requires Pb-based solder process | Select when legacy Pb-process compatibility is required and RoHS exemption applies |
| MMSZ4702T1G | Surface-mount SOD-123 package; 12 V ±5%; 500 mW rating; 30 Ω ZZT at 25 mA | Lower power and smaller footprint; not interchangeable without PCB redesign | Select for space-constrained designs where 500 mW dissipation suffices and reflow is preferred |
Compared with 1N4742A and MMSZ4702T1G, the 1N4742E3/TR13 offers RoHS compliance, tape-and-reel automation support, and full 1 W power handling in axial-leaded form - making it optimal for industrial through-hole production where thermal robustness and regulatory compliance are mandatory.
Availability
1N4742E3/TR13 is available at Aetrix Electronics and suitable for linear power supply regulation, analog signal clamping, and industrial sensor excitation requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for 1N4742E3/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 components for aerospace, defense, and industrial markets.
The 1N47xx series was designed specifically for cost-effective, high-stability voltage regulation in ruggedized power and signal conditioning applications - emphasizing thermal robustness, wide temperature operation, and JEDEC-standardized interchangeability.
FAQ
What is the Zener voltage tolerance of the 1N4742E3/TR13?
The 1N4742E3/TR13 has a nominal Zener voltage of 12 V with a tolerance of ±5%, as confirmed by Microsemi's JEDEC-registered electrical characteristics table. This tolerance applies at 21 mA test current and 25 °C lead temperature. The "A" in the base part number (1N4742A) denotes the 5% grade, and the "e3" suffix adds RoHS compliance without altering voltage specification.
Does the 1N4742E3/TR13 support automated assembly?
Yes, the 1N4742E3/TR13 is supplied in EIA-296 compliant tape-and-reel format (indicated by "TR13" suffix), enabling compatibility with standard pick-and-place equipment. Its DO-41 axial-leaded form factor is designed for through-hole insertion, and the matte-tin plating ensures reliable solder wetting during wave or selective soldering processes.
What is the maximum surge current rating for the 1N4742E3/TR13?
The 1N4742E3/TR13 is rated for a peak reverse surge current (ISM) of 380 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating reflects its capability to absorb transient overvoltage events without parametric shift or failure, supporting use in bus protection and clamp circuits.
How does the thermal resistance of the 1N4742E3/TR13 affect PCB layout?
The 1N4742E3/TR13 has a junction-to-lead thermal resistance of 45 °C/W at 10 mm lead length, meaning heat flows efficiently through its axial leads. For optimal thermal performance, leads should be soldered to ≥4 mm² copper pads with ≥1 mm track width and ≥25 mm length to achieve the rated 105 °C/W junction-to-ambient resistance on FR4 - critical for sustained 1 W operation.
Is the 1N4742E3/TR13 suitable for automotive under-hood applications?
Yes, the 1N4742E3/TR13 is qualified for operation from –65 °C to +150 °C and meets MIL-STD-750 ESD testing (Method 1020). Its moisture sensitivity Level 1 and UL94V-0 epoxy body support reliability in high-humidity, high-temperature under-hood environments - provided thermal design accommodates its 1 W dissipation limit at elevated ambient temperatures.
1N4742E3/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:
- ±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)
1N4742E3/TR13 FAQ
1.How can I place an order for 1N4742E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4742E3/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 1N4742E3/TR13 reliable?
The price and inventory of 1N4742E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4742E3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N4742E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4742E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4742E3/TR13?
1N4742E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4742E3/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 1N4742E3/TR13?
For technical support, including 1N4742E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4742E3/TR13 requirements.
6.How does Aetrix verify that 1N4742E3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N4742E3/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 1N4742E3/TR13 meets industry standards.
7.What is the process for return or replacement of 1N4742E3/TR13?
All 1N4742E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4742E3/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 1N4742E3/TR13 part is unused and in its original packaging.
Return procedure for 1N4742E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4742E3/TR13 Tags
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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MM5Z5V1ST1G
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