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Microchip Technology 1N4742APE3/TR12
- Part No.:
- 1N4742APE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4742APE3/TR12.pdf
- Description:
- DIODE ZENER 12V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:5,504
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Product details
Overview
1N4742APE3/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), 9 Ω dynamic impedance (ZZT), and 76 mA maximum regulator current (IZM) at 50°C. It provides stable voltage regulation in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N4742APE3/TR12 datasheet, 1N4742APE3/TR12 pinout, 1N4742APE3/TR12 application, or 1N4742APE3/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 per EIA-296.
Technical Context
This axial-lead Zener operates in reverse breakdown to maintain a stable 12 V reference across a wide current range (0.25–76 mA). Its 9 Ω dynamic impedance at 21 mA ensures low output variation under load transients, while its -65°C to +150°C operating range supports harsh-environment deployment.
The device uses void-free UL94V-0 thermosetting epoxy encapsulation with cathode band polarity marking. Thermal performance is defined relative to 3/8" (10 mm) lead length (45°C/W) or FR4 PCB mounting (105°C/W), enabling accurate power derating in real-world layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±5% at 21 mA - defines precise regulation point for feedback loops and reference rails |
| Power Dissipation | 1.0 W at 25°C - sets maximum continuous DC power handling before thermal derating |
| Dynamic Impedance (ZZT) | 9 Ω at IZT = 21 mA - determines output voltage stability under varying load currents |
| Max Regulator Current (IZM) | 76 mA at TA = 50°C - establishes safe upper limit for sustained Zener conduction |
| Thermal Resistance | 45°C/W junction-to-lead - enables accurate temperature rise calculation from lead temperature |
| Reverse Surge Current (ISM) | 380 mA (½-sine, 1/120 s) - specifies transient overvoltage clamping capability |
| Forward Voltage | ≤1.2 V at 200 mA - confirms low-loss forward conduction during fault or bias conditions |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; carries forward current or reverse leakage when not regulating |
| Cathode | Banded end | Connected to higher-potential node; conducts reverse current to clamp voltage at 12 V nominal |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N4742A series | Ensures industry-standard form, fit, and function compatibility across suppliers |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with annealed matte-tin terminal plating |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for SMT assembly |
| Low thermal resistance (45°C/W) | Enables higher power operation without heatsinking when leads are properly terminated |
| Nonsensitive to ESD | Withstands >4 kV HBM per MIL-STD-750 Method 1020 without parameter shift |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator circuits or switching converter error amplifiers. IC Role / Device Role / Timing Role: Zener diode acting as precision shunt voltage reference. Use Value: Delivers 12 V ±5% regulation with 9 Ω dynamic impedance to minimize output ripple and load-induced drift. | Use Scenario: Clamping transient surges on DC input rails of industrial controllers or sensor interfaces. IC Role / Device Role / Timing Role: Shunt protection device limiting rail voltage to 12 V during ESD or inductive kick events. Use Value: Withstands 380 mA surge current (½-sine, 1/120 s) while holding clamped voltage within specification. |
| Signal Level Shifting | Temperature-Stable Biasing |
Use Scenario: Establishing fixed bias points for op-amp inputs or transistor bases in analog front-ends. IC Role / Device Role / Timing Role: Passive voltage reference providing known DC offset in signal conditioning paths. Use Value: Maintains regulation across -65°C to +150°C, supporting operation in uncontrolled ambient environments. | Use Scenario: Generating stable bias for precision current sources or voltage-controlled oscillators. IC Role / Device Role / Timing Role: Temperature-compensated reference element leveraging low knee impedance (ZZK = 400 Ω @ 0.25 mA). Use Value: Achieves sharp breakdown knee and minimal voltage drift due to specified 12 V nominal and tight 5% tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A (non-e3, non-TR) | Same electrical specs but Sn/Pb terminations and bulk packaging; no RoHS compliance or tape-and-reel convenience | Limited to legacy or non-RoHS production; unsuitable for automated pick-and-place | Select when cost sensitivity outweighs environmental compliance or assembly automation needs |
| MMSZ4702T1G | Surface-mount SOD-123 package; 12 V ±5%, 500 mW rating; 10 Ω ZZT; RoHS-compliant | Lower power rating and different thermal path; requires PCB layout change and requalification | Choose for space-constrained designs where board area savings justify derated power and revalidation effort |
Compared with 1N4742A-series alternatives, the 1N4742APE3/TR12 uniquely combines JEDEC-standard DO-41 form factor, 1 W power rating, RoHS-compliant matte-tin plating, and EIA-296 tape-and-reel packaging-making it optimal for high-reliability through-hole production requiring regulatory compliance and automated assembly support.
Availability
1N4742APE3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and medical instrumentation requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4742APE3/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N4742APE3/TR12 belongs to Microsemi's legacy 1N47xxAP Zener family, engineered for robust voltage regulation in mission-critical power and protection circuits where thermal stability, surge resilience, and JEDEC interoperability are essential.
FAQ
What is the Zener voltage tolerance of the 1N4742APE3/TR12?
The 1N4742APE3/TR12 has a nominal Zener voltage of 12 V with a tolerance of ±5%, as confirmed by Microsemi's REV C datasheet (2005) and indicated by the "A" suffix in the part number. This tolerance applies at 21 mA test current and 25°C lead temperature. The device maintains this specification across its full operating temperature range (-65°C to +150°C), making it suitable for applications requiring predictable regulation bandwidth without calibration.
Does the 1N4742APE3/TR12 meet RoHS requirements?
Yes, the 1N4742APE3/TR12 meets RoHS Directive 2011/65/EU, as explicitly stated in the datasheet via the "e3" suffix. Its terminals feature RoHS-compliant annealed matte-tin plating, and the void-free UL94V-0 epoxy body contains no restricted substances above threshold limits. This certification applies to both the component itself and its tape-and-reel packaging (TR12), ensuring compliance for full production lots.
What is the maximum steady-state power dissipation for the 1N4742APE3/TR12?
The 1N4742APE3/TR12 has a maximum steady-state power dissipation of 1.0 W at TL < 105°C with 3/8" (10 mm) lead length from the body, or at TA < 45°C when mounted on an FR4 PCB with specified copper pad geometry. Power must be derated linearly above these temperatures per Figure 1 in the datasheet. This rating directly governs safe continuous Zener conduction in voltage reference and clamping roles.
How is polarity marked on the 1N4742APE3/TR12?
The 1N4742APE3/TR12 uses a cathode band to indicate polarity: the banded end is the cathode and must be held at a higher potential than the anode (non-banded end) for proper Zener regulation. This marking conforms to JEDEC DO-41 standards and is visible on the black epoxy body. Incorrect orientation results in forward conduction (~1.2 V drop) rather than 12 V regulation.
What does the "TR12" suffix indicate in 1N4742APE3/TR12?
"TR12" denotes EIA-296 standard tape-and-reel packaging with 12 mm tape width, enabling automated surface-mount assembly equipment compatibility. This format includes precise component spacing, cover tape sealing, and reel labeling per industry standard. The "TR" suffix is additive to the base part number and does not affect electrical specifications-1N4742APE3/TR12 retains identical Zener voltage, impedance, and thermal characteristics as the bulk version.
1N4742APE3/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:
- ±5%
- 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)
1N4742APE3/TR12 FAQ
1.How can I place an order for 1N4742APE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4742APE3/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 1N4742APE3/TR12 reliable?
The price and inventory of 1N4742APE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4742APE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4742APE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4742APE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4742APE3/TR12?
1N4742APE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4742APE3/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 1N4742APE3/TR12?
For technical support, including 1N4742APE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4742APE3/TR12 requirements.
6.How does Aetrix verify that 1N4742APE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4742APE3/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 1N4742APE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4742APE3/TR12?
All 1N4742APE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4742APE3/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 1N4742APE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4742APE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4742APE3/TR12 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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MM5Z5V1ST1G
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