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Microchip Technology 1N4749APE3/TR8
- Part No.:
- 1N4749APE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4749APE3/TR8.pdf
- Description:
- DIODE ZENER 24V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,737
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Product details
Overview
1N4749APE3/TR8 from Microsemi is a 1.0 W axial-lead silicon Zener diode with nominal Zener voltage of 24 V, ±5% tolerance (A suffix), 10.5 mA test current (IZT), 25 Ω maximum dynamic impedance (ZZT), and 5 μA maximum reverse leakage at 18.2 V (VR). It regulates voltage in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N4749APE3/TR8 datasheet, 1N4749APE3/TR8 pinout, 1N4749APE3/TR8 application, or 1N4749APE3/TR8 equivalent, key selection factors include its DO-41 package thermal resistance (45 °C/W junction-to-lead), 24 V regulation stability over -65 °C to +150 °C, RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR8).
Technical Context
This device operates in reverse breakdown to maintain stable voltage under varying load and temperature conditions. Its 24 V Zener voltage exhibits a positive temperature coefficient above ~5 V, with typical TC near +9.5 mV/°C per Figure 3 - enabling predictable drift compensation in precision references.
The 1N4749APE3/TR8 delivers 190 mA maximum regulator current (IZM) at TA = 50 °C and supports surge currents up to 190 mA (ISM) using a ½-sine wave pulse. Its 1.2 V forward voltage at 200 mA ensures low-loss biasing in series-shunt configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V ±5% at IZT = 10.5 mA - defines primary regulation point for feedback networks and clamp thresholds |
| Power Dissipation | 1.0 W at TL < 105 °C (3/8″ lead length) - sets maximum continuous DC power handling on standard leads |
| Dynamic Impedance (ZZT) | 25 Ω max at IZT = 10.5 mA - determines output voltage variation under load transients |
| Reverse Leakage (IR) | 5 μA max at VR = 18.2 V - ensures minimal quiescent current in high-impedance bias circuits |
| Thermal Resistance | 45 °C/W junction-to-lead - enables thermal design with discrete lead heatsinking |
| Operating Temperature | -65 °C to +150 °C - supports deployment in automotive engine compartments and industrial controls |
| Forward Voltage | 1.2 V max at IF = 200 mA - allows reliable forward conduction for dual-polarity protection schemes |
Pinout & Package
Package: DO-41 (DO-204AL) plastic molded case with void-free thermosetting epoxy (UL94V-0), cathode indicated by band. Tin-lead or RoHS-compliant matte-tin plating, 0.7 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in shunt regulator | Connected to system ground or lower-potential rail; carries full load current during regulation |
| Cathode | Regulated output node | Banded end; held at stable 24 V relative to anode; requires current-limiting resistor in series |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Guarantees mechanical and electrical interchangeability with legacy 1N4749A designs |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with annealed matte-tin plating, no lead or hazardous substances |
| Tape-and-reel "TR8" packaging | Standard EIA-296 compliant reel (8 mm tape, 1000 pcs/reel) for automated SMT placement compatibility |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies storage and assembly logistics |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - withstands handling without special grounding protocols |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 24 V setpoint to optocoupler input circuit. Use Value: Maintains ±1% output regulation over line/load/temperature with <25 Ω dynamic impedance limiting error amplifier gain variation. |
Use Scenario: Protecting 24 V logic inputs from transient surges exceeding 30 V in factory automation I/O modules. IC Role / Device Role / Timing Role: Passive clamping element diverting excess energy to ground when input exceeds 24 V. Use Value: Limits peak voltage to ≤24.6 V (24 V + 5% tolerance) with 190 mA surge capability, preventing damage to downstream CMOS buffers. |
| Automotive Sensor Biasing | Programmable Threshold Detection |
Use Scenario: Providing stable excitation voltage to resistive temperature sensors (RTDs) in engine control units. IC Role / Device Role / Timing Role: Precision bias source maintaining constant current through sensor bridge at ambient extremes. Use Value: Delivers 24 V reference with <±0.5% drift over -40 °C to +125 °C due to predictable +9.5 mV/°C TC, enabling accurate cold-junction compensation. |
Use Scenario: Setting trip point for comparator-based battery undervoltage lockout in 24 V telecom backup systems. IC Role / Device Role / Timing Role: Fixed threshold generator defining 24 V turn-off boundary for PMOS high-side switch control. Use Value: Enables clean, hysteresis-free shutdown at exactly 24 V ±1.2 V, avoiding brown-out oscillation during gradual discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A-T | Same 24 V ±5%, DO-41, but non-RoHS tin-lead plating and bulk packaging (no TR8) | Lacks tape-and-reel delivery; not compliant with modern environmental directives | Select when legacy assembly lines require Sn/Pb solder compatibility and manual placement is used |
| MMSZ4702T1G | Surface-mount SOD-123 package, same 24 V ±5%, 500 mW rating, 30 Ω ZZT | Lower power (0.5 W vs. 1.0 W); unsuitable for >125 mA continuous regulation | Choose for space-constrained PCBs where thermal management permits reduced dissipation |
Compared with 1N4749A-T and MMSZ4702T1G, the 1N4749APE3/TR8 uniquely combines full 1.0 W dissipation, RoHS compliance, and EIA-296 tape-and-reel readiness - making it optimal for high-reliability industrial production requiring traceable, environmentally aligned components.
Availability
1N4749APE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, and telecom voltage clamping requiring stable component supply with full RoHS compliance and automated assembly support.
Supply support for 1N4749APE3/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 engineered for ruggedized voltage regulation in mission-critical power systems, emphasizing thermal robustness, long-term parametric stability, and extended temperature operation.
FAQ
What is the Zener voltage tolerance of the 1N4749APE3/TR8?
The 1N4749APE3/TR8 has a nominal Zener voltage of 24 V with ±5% tolerance, indicated by the "A" suffix in the part number per JEDEC registration. This means the actual measured VZ at IZT = 10.5 mA falls between 22.8 V and 25.2 V under standard test conditions (TL = 25 °C, 90 s stabilization).
Does the 1N4749APE3/TR8 support automated pick-and-place assembly?
Yes, the 1N4749APE3/TR8 is supplied in EIA-296 standard tape-and-reel format ("TR8" suffix), with 1000 units per reel and 8 mm carrier tape width. Its DO-41 body geometry and matte-tin plating ensure reliable vacuum nozzle pickup and placement accuracy in high-speed SMT lines.
What is the maximum steady-state current the 1N4749APE3/TR8 can regulate at room temperature?
At TA = 25 °C and proper PCB layout (FR4, 1 oz Cu, 4 mm² pads), the 1N4749APE3/TR8 supports up to 190 mA continuous regulator current (IZM) before exceeding its 1.0 W power limit. Derating begins linearly above 45 °C ambient, reaching zero allowable current at 150 °C.
How does the thermal resistance of the 1N4749APE3/TR8 affect PCB layout?
The 1N4749APE3/TR8 specifies 45 °C/W junction-to-lead thermal resistance at 3/8″ (10 mm) lead length. To avoid exceeding 150 °C junction temperature, keep lead lengths ≥10 mm and use wide copper traces (≥1 mm width, ≥25 mm length) connecting to thermal pads - critical for sustained 1 W operation.
Is the 1N4749APE3/TR8 suitable for automotive under-hood applications?
Yes, the 1N4749APE3/TR8 is rated for -65 °C to +150 °C operating and storage temperature, fully meeting under-hood requirements. Its moisture sensitivity Level 1 and MIL-STD-750 qualified ESD immunity further support deployment in engine control modules and transmission control units.
1N4749APE3/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):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 18.2 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)
1N4749APE3/TR8 FAQ
1.How can I place an order for 1N4749APE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4749APE3/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 1N4749APE3/TR8 reliable?
The price and inventory of 1N4749APE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4749APE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4749APE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4749APE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4749APE3/TR8?
1N4749APE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4749APE3/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 1N4749APE3/TR8?
For technical support, including 1N4749APE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4749APE3/TR8 requirements.
6.How does Aetrix verify that 1N4749APE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4749APE3/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 1N4749APE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4749APE3/TR8?
All 1N4749APE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4749APE3/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 1N4749APE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4749APE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4749APE3/TR8 Tags
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