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Microchip Technology 1N4742APE3/TR8
- Part No.:
- 1N4742APE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4742APE3/TR8.pdf
- Description:
- DIODE ZENER 12V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,245
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Product details
Overview
1N4742APE3/TR8 from Microsemi is a 12 V, ±5% tolerance, 1 W axial-lead 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 sensor interfaces.
For engineers reviewing the 1N4742APE3/TR8 datasheet, 1N4742APE3/TR8 pinout, 1N4742APE3/TR8 application, or 1N4742APE3/TR8 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 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 delivers regulated output with 76 Ω dynamic impedance at 21 mA IZT and exhibits a temperature coefficient near 0.065 mV/°C at 12 V, per Figure 3 of the Microsemi datasheet.
The device is rated for 1.0 W steady-state dissipation at lead temperature <105 °C (3/8" from body) or ambient <45 °C on FR4 board, with derating applied above those thresholds. Its cathode band polarity and 1.2 V forward voltage max at 200 mA support unambiguous orientation and low-loss forward conduction during transient clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±5% - defines nominal regulation point with tight production control for stable reference generation |
| Test Current (IZT) | 21 mA - operating point where dynamic impedance and voltage are specified; sets bias design target |
| Dynamic Impedance (ZZT) | 76 Ω @ IZT - determines output voltage variation under load changes; critical for ripple rejection |
| Max Reverse Current (IR) | 5 μA @ 9.1 V - ensures low leakage below regulation threshold; enables accurate turn-on detection |
| Power Dissipation | 1.0 W @ TL < 105 °C - defines maximum continuous thermal load before derating; guides heatsinking |
| Thermal Resistance | 45 °C/W junction-to-lead - quantifies self-heating under bias; essential for reliability modeling |
| Surge Current (ISM) | 380 mA - peak non-repetitive current capability for transient suppression without failure |
Pinout & Package
DO-41 (DO-204AL) plastic axial-lead 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 | Reverse-biased reference node | Connected to lower-potential rail; carries reverse current during regulation |
| Cathode | Regulated output node | Banded end; held at stable VZ above anode; referenced to system ground or supply return |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N47xxAP registration | Ensures industry-standard mechanical and electrical interchangeability across suppliers |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with annealed matte-tin plating and lead-free assembly compatibility |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for SMT reflow handling |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables safe handling in standard lab and production environments without special grounding |
| Plastic P-suffix construction | Provides lower thermal resistance vs. glass-body G-suffix variants, improving power handling |
Applications
| Linear Power Supply Regulation | Analog Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing +12 V rail in unregulated transformer-rectifier-capacitor supplies for op-amp biasing and microcontroller peripherals. IC Role / Device Role / Timing Role: Voltage reference element providing fixed 12 V reference for feedback networks and shunt regulation. Use Value: Maintains ±5% output accuracy across 10–100 mA load range and −65 °C to +150 °C ambient, reducing need for active regulation. | Use Scenario: Clamping and biasing thermistor or RTD bridge outputs in industrial temperature transmitters. IC Role / Device Role / Timing Role: Precision shunt reference establishing known excitation voltage and overvoltage protection threshold. Use Value: 76 Ω ZZT ensures <0.8 V deviation under 15 mA signal current variation, preserving measurement linearity. |
| Overvoltage Protection Circuit | Reference Voltage Generator |
Use Scenario: Safeguarding 12 V automotive ECUs against load-dump transients up to 380 mA surge current. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping input rail to 12.6 V (max) during fault events. Use Value: 380 mA ISM rating allows single-device protection without external series resistor, simplifying BOM. | Use Scenario: Generating stable 12 V reference for ADC reference inputs and DAC output buffers in data acquisition modules. IC Role / Device Role / Timing Role: Low-drift Zener source delivering precise DC voltage independent of supply fluctuations. Use Value: 0.065 mV/°C tempco and 5 μA IR enable <±0.1% reference drift over −40 °C to +85 °C operating range. |
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 VZ, IZT, ZZT, and package | Not compliant with EU RoHS Directive; requires Pb-containing solder process | Select when legacy Pb-based assembly is mandated and environmental compliance is not required |
| MMBZ5242B | SOT-23 surface-mount package; 12 V ±5%; 20 mA IZT; 30 Ω ZZT; 250 mW rating | Lower power, smaller footprint, higher ZZT stability but reduced surge capability | Select for space-constrained PCBs where 250 mW dissipation suffices and reflow compatibility is prioritized |
Compared with 1N4742APE3/TR8, the 1N4742A lacks RoHS compliance but matches all electrical specs, while MMBZ5242B trades axial-leaded robustness and 1 W power handling for miniaturization and tighter thermal profile in SMT layouts.
Availability
1N4742APE3/TR8 is available at Aetrix Electronics and suitable for linear power supply regulation, analog sensor signal conditioning, and overvoltage protection circuits requiring stable component supply, consistent Zener voltage tolerance, and RoHS-compliant manufacturing.
Supply support for 1N4742APE3/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, RF, and discrete components for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed specifically for general-purpose voltage regulation and reference applications demanding JEDEC-standard performance, moisture-insensitive packaging, and extended temperature operation from −65 °C to +150 °C.
FAQ
What is the Zener voltage tolerance of the 1N4742APE3/TR8?
The 1N4742APE3/TR8 has a Zener voltage tolerance of ±5%, as indicated by the "A" suffix in its part number per Microsemi's JEDEC-registered specification. This means its nominal 12 V Zener voltage is guaranteed between 11.4 V and 12.6 V at 21 mA test current and 25 °C lead temperature. The tolerance remains valid across the full operating temperature range of −65 °C to +150 °C, supporting reliable reference design in harsh environments. This 1N4742APE3/TR8 tolerance is tighter than non-suffixed variants (±10%) and looser than "C" (±2%) or "D" (±1%) versions.
Does the 1N4742APE3/TR8 require dry packing before reflow soldering?
No, the 1N4742APE3/TR8 does not require dry packing prior to reflow soldering because it is classified as Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B. This classification confirms the DO-41 plastic encapsulation is void-free and inherently resistant to moisture absorption, eliminating floor-life limitations and bake-out steps. Its RoHS-compliant matte-tin plating also supports standard 260 °C / 10 s solder profiles without degradation. This makes the 1N4742APE3/TR8 suitable for high-throughput automated assembly without special handling protocols.
What is the maximum surge current rating for the 1N4742APE3/TR8?
The 1N4742APE3/TR8 has a maximum non-repetitive surge current (ISM) rating of 380 mA, measured using a ½ sine-wave pulse of 1/120 second duration at 25 °C ambient. This rating applies when the device is operated in reverse breakdown and defines its transient energy-handling capability for overvoltage events such as load dump or ESD-induced spikes. Exceeding this value risks irreversible junction damage. The 1N4742APE3/TR8 achieves this rating due to its 1 W power construction and optimized thermal path in the DO-41 package.
How does the thermal resistance of the 1N4742APE3/TR8 affect PCB layout?
The 1N4742APE3/TR8 has a junction-to-lead thermal resistance of 45 °C/W, meaning each watt of dissipated power raises the junction temperature 45 °C above the lead temperature measured 3/8" from the body. For PCB layout, this implies that minimizing lead length and maximizing copper area around leads improves heat transfer. When mounted on FR4 with 4 mm² copper pads and 1 mm wide × 25 mm long traces, its junction-to-ambient resistance rises to 105 °C/W - so layout must ensure ambient stays ≤45 °C to sustain 1 W operation. This directly informs trace width, pad size, and proximity to heat sources in the 1N4742APE3/TR8 design.
Is the 1N4742APE3/TR8 compatible with lead-free soldering processes?
Yes, the 1N4742APE3/TR8 is fully compatible with lead-free soldering processes. Its "e3" suffix denotes RoHS-compliant annealed matte-tin plating, qualified per MIL-STD-750 Method 2026 for solderability. It withstands peak temperatures of 260 °C for up to 10 seconds - matching standard SAC305 reflow profiles. The plastic epoxy case meets UL94V-0 flammability requirements and remains stable under repeated thermal cycling. No special preheat or cooling ramp rates are needed, making the 1N4742APE3/TR8 suitable for mainstream lead-free manufacturing lines without process modification.
1N4742APE3/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:
- ±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/TR8 FAQ
1.How can I place an order for 1N4742APE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4742APE3/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 1N4742APE3/TR8 reliable?
The price and inventory of 1N4742APE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4742APE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4742APE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4742APE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4742APE3/TR8?
1N4742APE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4742APE3/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 1N4742APE3/TR8?
For technical support, including 1N4742APE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4742APE3/TR8 requirements.
6.How does Aetrix verify that 1N4742APE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4742APE3/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 1N4742APE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4742APE3/TR8?
All 1N4742APE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4742APE3/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 1N4742APE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4742APE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4742APE3/TR8 Tags
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