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Microchip Technology 1N4749PE3/TR12
- Part No.:
- 1N4749PE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4749PE3/TR12.pdf
- Description:
- DIODE ZENER 24V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,564
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Product details
Overview
1N4749PE3/TR12 from Microsemi is a 24 V, 5% tolerance, 1 W silicon Zener diode in DO-41 plastic package, rated for 10.5 mA test current (IZT), 25 Ω dynamic impedance (ZZT), and 750 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 1N4749PE3/TR12 datasheet, 1N4749PE3/TR12 pinout, 1N4749PE3/TR12 application, or 1N4749PE3/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (45°C/W junction-to-lead), surge current rating (190 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging per EIA-296.
Technical Context
This axial-leaded Zener operates in reverse breakdown to maintain a stable 24 V reference across a wide current range (0.25–190 mA). Its 5% voltage tolerance (A-suffix), 25 Ω dynamic impedance at 10.5 mA, and −65°C to +150°C operating temperature support precision regulation in unregulated DC supplies and feedback networks.
The device features a void-free UL94V-0 epoxy body, cathode band polarity marking, and moisture sensitivity level 1 per J-STD-020B-eliminating dry-pack requirements. Thermal performance is specified with 3/8″ (10 mm) lead length (45°C/W) and on FR4 board (105°C/W), enabling accurate derating in real-world layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V ±5% at 10.5 mA - defines nominal regulation point with tight production control for reference stability |
| Power Dissipation | 1.0 W at TL < 105°C - sets maximum continuous power handling with 3/8″ lead length derating |
| Dynamic Impedance (ZZT) | 25 Ω at IZT = 10.5 mA - determines output voltage variation under load current changes |
| Max Regulator Current (IZM) | 750 mA at TA = 50°C - establishes safe peak current limit before thermal runaway |
| Surge Current (ISM) | 190 mA (½-sine, 1/120 s) - supports transient overvoltage clamping without degradation |
| Thermal Resistance | 45°C/W junction-to-lead - enables accurate junction temperature calculation for reliability analysis |
| Forward Voltage | ≤1.2 V at 200 mA - ensures low conduction loss when used in forward-biased protection paths |
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 | Reverse-bias reference node | Connected to lower-potential side of regulated circuit; carries full Zener current during regulation |
| Cathode | Regulated output node | Banded end; held at stable 24 V above anode potential during reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Fully compliant with JEDEC 1N47xxA standard-ensures interchangeability and qualification consistency |
| RoHS-compliant "e3" suffix | Matte-tin plating meets EU RoHS Directive 2011/65/EU and Pb-free assembly requirements |
| Tape-and-reel packaging | TR12 designation indicates EIA-296 standard 12 mm tape, enabling automated SMT placement compatibility |
| Moisture Sensitivity Level 1 | No dry-pack required per IPC/JEDEC J-STD-020B-reduces handling cost and floor-life constraints |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020-enables robust handling in non-ESD-controlled environments |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators. IC Role / Device Role / Timing Role: Zener reference element providing precise 24 V setpoint to error amplifier input. Use Value: Maintains ±5% output regulation despite input ripple and load variation due to low 25 Ω dynamic impedance. | Use Scenario: Protecting downstream circuitry from transient voltage spikes exceeding 24 V. IC Role / Device Role / Timing Role: Shunt clamping device diverting excess current when line voltage exceeds 24 V. Use Value: Absorbs 190 mA surge pulses without failure, leveraging 1 W power rating and 750 mA IZM capability. |
| Voltage Monitor Threshold | Signal-Level Translation |
Use Scenario: Detecting undervoltage or overvoltage conditions in battery-powered instrumentation. IC Role / Device Role / Timing Role: Precision threshold detector using reverse-bias breakdown as switching trigger. Use Value: Enables reliable 24 V trip point with minimal hysteresis thanks to sharp knee impedance (ZZK = 38 Ω at IZK = 0.25 mA). | Use Scenario: Level-shifting logic signals between 3.3 V/5 V microcontrollers and 24 V industrial sensors. IC Role / Device Role / Timing Role: Bidirectional clamp limiting signal swing to ±24 V while passing valid logic transitions. Use Value: Prevents sensor interface damage using forward conduction (<1.2 V) and reverse clamping (24 V) simultaneously. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | No "P" (plastic) or "e3" (RoHS) suffix; glass-body construction; Sn/Pb plating only | Lacks RoHS compliance and moisture-level-1 certification; higher thermal resistance than plastic variant | Select only if legacy Sn/Pb assembly or non-RoHS environment required |
| MMSZ4704T1G | Surface-mount SOD-123 package; 24 V ±5%; 500 mW rating; 30 Ω ZZT at 5 mA | Lower power and smaller footprint; unsuitable for high-current (>350 mA) regulation | Choose for space-constrained PCBs where 1 W dissipation is not required |
Compared with 1N4749A and MMSZ4704T1G, the 1N4749PE3/TR12 delivers superior thermal performance (45°C/W vs. ~120°C/W for glass), guaranteed RoHS compliance, and tape-and-reel automation readiness-making it optimal for new industrial power designs requiring long-term supply continuity and environmental compliance.
Availability
1N4749PE3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and programmable logic controller (PLC) I/O protection requiring stable component supply and long-lifecycle support.
Supply support for 1N4749PE3/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed specifically for general-purpose voltage regulation in ruggedized power systems where stability, thermal robustness, and JEDEC-standard interchangeability are critical.
FAQ
What is the Zener voltage tolerance of the 1N4749PE3/TR12?
The 1N4749PE3/TR12 has a nominal Zener voltage of 24 V with a ±5% tolerance, as indicated by the "A" suffix in its JEDEC part number. This tolerance is verified at 10.5 mA test current and 25°C lead temperature. The "e3" suffix confirms RoHS-compliant matte-tin plating, but does not affect voltage specification. Tighter tolerances (±2%, ±1%) require "C" or "D" suffixes, which are not present in this part number.
Does the 1N4749PE3/TR12 support automated assembly?
Yes, the 1N4749PE3/TR12 is supplied in EIA-296 standard tape-and-reel format (denoted by "TR12"), enabling direct use in pick-and-place equipment. Its DO-41 axial package is compatible with standard lead-forming and insertion tooling. The matte-tin plating ensures reliable solder wetting in both wave and reflow processes, and its moisture sensitivity level 1 eliminates bake requirements prior to assembly.
What is the maximum continuous current the 1N4749PE3/TR12 can regulate?
The 1N4749PE3/TR12 supports a maximum regulator current (IZM) of 750 mA at ambient temperature of 50°C, as specified in the Electrical Characteristics table. At higher temperatures, current must be derated per the power curve in Figure 1. Its 1.0 W power rating and 45°C/W junction-to-lead thermal resistance allow sustained operation up to this limit when leads are maintained below 105°C.
How does the 1N4749PE3/TR12 differ from the 1N4749A?
The 1N4749PE3/TR12 adds three key enhancements over the base 1N4749A: the "P" suffix denotes plastic encapsulation (lower thermal resistance than glass-body 1N4749A), "e3" confirms RoHS-compliant matte-tin plating, and "TR12" specifies EIA-296 tape-and-reel packaging. These differences improve manufacturability, thermal performance, and environmental compliance-making 1N4749PE3/TR12 the preferred choice for new designs.
Is the 1N4749PE3/TR12 suitable for overvoltage protection in 24 V automotive systems?
Yes, the 1N4749PE3/TR12 is rated for −65°C to +150°C operating temperature and qualified to MIL-STD-750 for ESD robustness, making it suitable for under-hood automotive applications. Its 24 V Zener voltage aligns with common 24 V vehicle electrical systems, and its 190 mA surge current rating handles typical load-dump transients when used with appropriate series impedance. Confirm system-level clamping energy with actual circuit simulation.
1N4749PE3/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):
- 24 V
- Tolerance:
- ±10%
- 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)
1N4749PE3/TR12 FAQ
1.How can I place an order for 1N4749PE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4749PE3/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 1N4749PE3/TR12 reliable?
The price and inventory of 1N4749PE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4749PE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4749PE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4749PE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4749PE3/TR12?
1N4749PE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4749PE3/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 1N4749PE3/TR12?
For technical support, including 1N4749PE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4749PE3/TR12 requirements.
6.How does Aetrix verify that 1N4749PE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4749PE3/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 1N4749PE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4749PE3/TR12?
All 1N4749PE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4749PE3/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 1N4749PE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4749PE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4749PE3/TR12 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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