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Microchip Technology 1N4742PE3/TR8
- Part No.:
- 1N4742PE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4742PE3/TR8.pdf
- Description:
- DIODE ZENER 12V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,248
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Product details
Overview
1N4742PE3/TR8 from Microsemi is a 12 V, 5% tolerance, 1 W plastic-encapsulated Zener diode in DO-41 package, rated for 21 mA test current, 9 Ω dynamic impedance at IZT, and 76 mA maximum regulator current at TA = 50°C. It provides stable voltage regulation in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N4742PE3/TR8 datasheet, 1N4742PE3/TR8 pinout, 1N4742PE3/TR8 application, or 1N4742PE3/TR8 equivalent, key selection factors include its 12 V nominal Zener voltage, ±5% tolerance (A-suffix), RoHS-compliant matte-tin plating, tape-and-reel packaging (TR8), and DO-41 mechanical compatibility with axial-lead PCB mounting.
Technical Context
This Zener operates in reverse breakdown to maintain a stable 12 V reference across a wide current range (0.25–76 mA), with low dynamic impedance (9 Ω) ensuring minimal output variation under load transients. Its thermal resistance is 45 °C/W junction-to-lead (3/8″ lead length) and 105 °C/W junction-to-ambient on FR4 board.
The device features cathode band polarity marking, UL94V-0 epoxy case, and meets MIL-STD-750 Method 1020 for ESD insensitivity. Moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1 - no dry pack required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V nominal at 21 mA test current - defines precise regulation point for reference design |
| Tolerance | ±5% (A-suffix) - ensures predictable voltage window of 11.4–12.6 V under production conditions |
| Power Dissipation | 1.0 W at TL < 105°C - supports continuous operation in compact power rails without forced cooling |
| Dynamic Impedance (ZZT) | 9 Ω at IZT = 21 mA - limits output voltage shift to <0.2 V per 20 mA load change |
| Max Regulator Current (IZM) | 76 mA at TA = 50°C - sets upper bound for safe steady-state shunt current capability |
| Reverse Leakage (IR) | <5 μA at VR = 9.1 V - guarantees minimal standby power loss in high-impedance bias networks |
| Operating Temperature | −65°C to +150°C - enables deployment in automotive engine bays and industrial control enclosures |
Pinout & Package
Package: DO-41 (JEDEC DO-204AL), axial-lead plastic encapsulated diode with cathode indicated by colored band. Body diameter 2.0–2.7 mm, overall length 4.5–5.5 mm, lead diameter 0.4–0.6 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; forward voltage ≤1.2 V @ 200 mA during conduction |
| Cathode | Banded end | Connected to higher-potential node; reverse-biased to achieve 12 V Zener regulation |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant "e3" suffix | Matte-tin terminal plating compliant with EU Directive 2011/65/EU and JEDEC J-STD-020B Level 1 |
| Tape-and-reel packaging | "TR8" indicates EIA-296 standard 8 mm tape, 1000 pcs/reel - optimized for automated SMT placement |
| Low thermal resistance | 45 °C/W junction-to-lead - enables higher power handling than glass-body equivalents (e.g., 1N4742A) |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for additional ESD protection in board-level design |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator circuits or as precision reference in ADC bias networks. IC Role / Device Role / Timing Role: Zener diode providing fixed 12 V reference node independent of input ripple or load variation. Use Value: Delivers ±5% accuracy and 9 Ω dynamic impedance to hold reference error within ±0.6 V across 1–76 mA operating range. | Use Scenario: Protecting downstream ICs from transient overvoltage events on 12 V rail (e.g., automotive load dump). IC Role / Device Role / Timing Role: Shunt clamping element that conducts excess current above 12 V to ground when voltage exceeds regulation threshold. Use Value: Absorbs up to 1.0 W continuously or 76 mA peak current without degradation, limiting rail excursion to ≤12.6 V. |
| Signal Level Translation | Current Source Bias |
Use Scenario: Generating stable bias voltage for op-amp input stages or logic-level shifting between mixed-voltage domains. IC Role / Device Role / Timing Role: Passive voltage source establishing known DC offset for analog signal conditioning paths. Use Value: Maintains 12 V output with <5 μA leakage at 9.1 V reverse bias - minimizes loading on high-impedance sensor interfaces. | Use Scenario: Setting constant current through LED strings or transistor base resistors using Zener-based current mirror topology. IC Role / Device Role / Timing Role: Voltage reference defining emitter-base or gate-source potential in discrete current-regulating circuits. Use Value: Enables accurate 12 V reference with 0.25–76 mA operational range - supports current sources from ~1 mA to >70 mA depending on series resistor. |
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 terminations; same electrical specs and DO-41 package | Not suitable for RoHS-compliant production; requires Pb-containing solder process | Select only for legacy repair or non-RoHS environments where tin-lead assembly is mandated |
| MMSZ4702T1G | Surface-mount SOD-123 package; 12 V, ±5%, 500 mW rating; 10 Ω ZZT; 50 mA IZM | Lower power and smaller footprint; not drop-in compatible due to package and thermal limits | Choose for space-constrained PCBs where 500 mW rating suffices and reflow compatibility is required |
Compared with 1N4742A and MMSZ4702T1G, the 1N4742PE3/TR8 offers full 1 W dissipation in RoHS-compliant axial form, making it optimal for through-hole power reference and clamp designs requiring robust thermal performance and regulatory compliance.
Availability
1N4742PE3/TR8 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and signal level translation applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for 1N4742PE3/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 - balancing precision, ruggedness, and manufacturability in axial-leaded Zener diodes.
FAQ
What is the Zener voltage tolerance of the 1N4742PE3/TR8?
The 1N4742PE3/TR8 has a ±5% Zener voltage tolerance, confirmed by the "A" suffix in its part number per Microsemi's documentation. This means its measured VZ falls between 11.4 V and 12.6 V at 21 mA test current and 25°C lead temperature. The tolerance applies across the full operating temperature range and is verified during production screening.
Does the 1N4742PE3/TR8 require dry packing before PCB assembly?
No, the 1N4742PE3/TR8 does not require dry packing. It is moisture sensitivity level (MSL) Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ambient conditions without baking. This simplifies handling and eliminates pre-reflow moisture removal steps for the 1N4742PE3/TR8.
What is the maximum continuous power dissipation for the 1N4742PE3/TR8 on a standard FR4 PCB?
The 1N4742PE3/TR8 dissipates 1.0 W continuously when mounted on FR4 with 1 oz copper, 4 mm² pads, and 1 mm × 25 mm traces - provided ambient temperature remains below 45°C. Above 45°C, derating applies per Figure 1 in the Microsemi datasheet, reducing allowable power linearly to zero at 150°C ambient.
Can the 1N4742PE3/TR8 be used as a replacement for the 1N4742A in existing designs?
Yes, the 1N4742PE3/TR8 is functionally identical to the 1N4742A in all electrical and mechanical parameters except for RoHS compliance and packaging. Its DO-41 outline, 12 V Zener voltage, ±5% tolerance, and 1 W rating match exactly - only the matte-tin terminations and TR8 tape-and-reel format differ, making it a direct upgrade path for RoHS-compliant production of the 1N4742A.
What is the forward voltage specification for the 1N4742PE3/TR8?
The forward voltage of the 1N4742PE3/TR8 is specified as ≤1.2 V at 200 mA forward current, per Microsemi's electrical characteristics table. This parameter is relevant when the device is operated in forward conduction mode - for example, in polarity protection or dual-function circuits - and confirms low-loss behavior comparable to standard silicon rectifiers.
1N4742PE3/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:
- ±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/TR8 FAQ
1.How can I place an order for 1N4742PE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4742PE3/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 1N4742PE3/TR8 reliable?
The price and inventory of 1N4742PE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4742PE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4742PE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4742PE3/TR8 transactions.
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4.How is shipping managed for 1N4742PE3/TR8?
1N4742PE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4742PE3/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 1N4742PE3/TR8?
For technical support, including 1N4742PE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4742PE3/TR8 requirements.
6.How does Aetrix verify that 1N4742PE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4742PE3/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 1N4742PE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4742PE3/TR8?
All 1N4742PE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4742PE3/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 1N4742PE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4742PE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4742PE3/TR8 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
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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