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Microchip Technology 1N4749APE3/TR12
- Part No.:
- 1N4749APE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4749APE3/TR12.pdf
- Description:
- DIODE ZENER 24V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,928
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Product details
Overview
1N4749APE3/TR12 from Microsemi is a 1.0 W, 24 V ±5% Zener diode in DO-41 plastic package, rated for 10.5 mA test current (IZT), 25 Ω dynamic impedance (ZZT), and 5 μA reverse leakage at 18.2 V (VR). It operates from –65°C to +150°C and regulates voltage in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4749APE3/TR12 datasheet, 1N4749APE3/TR12 pinout, 1N4749APE3/TR12 application, or 1N4749APE3/TR12 equivalent, key selection factors 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 (TR12).
Technical Context
This discrete Zener diode functions as a two-terminal voltage reference device operating in reverse breakdown. Its regulation performance is defined by specified test current (IZT = 10.5 mA), knee current (IZK = 0.25 mA), and dynamic impedance (ZZT = 25 Ω at IZT), with temperature coefficient optimized near 24 V.
It exhibits 5 μA maximum reverse leakage at VR = 18.2 V and withstands 190 mA non-repetitive surge current (ISM) under standardized 1/120 s half-sine conditions. Thermal design must account for 45°C/W junction-to-lead resistance at 10 mm lead length or 105°C/W junction-to-ambient on FR4 with defined copper layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V ±5% at IZT = 10.5 mA - defines nominal regulation point with tight production tolerance |
| Power Dissipation | 1.0 W at TL ≤ 105°C (3/8″ lead length) - sets maximum steady-state thermal load |
| Dynamic Impedance | 25 Ω at IZT - determines output voltage variation under changing load current |
| Reverse Leakage | ≤5 μA at VR = 18.2 V - ensures low standby power loss in high-impedance bias networks |
| Surge Current | 190 mA (1/120 s half-sine) - supports transient overvoltage clamping without failure |
| Thermal Resistance | 45°C/W junction-to-lead - enables thermal modeling using standard lead-mounting geometry |
| Operating Temperature | –65°C to +150°C - validated for industrial and extended-temperature environments |
Pinout & Package
DO-41 (DO-204AL) axial-leaded plastic package with cathode band marking; terminals are unidirectional anode/cathode leads for through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during Zener operation; forward voltage ≤1.2 V at 200 mA |
| Cathode | Zener regulation terminal | Banded end; connected to higher-potential node; maintains 24 V reference when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant matte-tin plating | Meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity without dry pack requirement |
| Plastic encapsulation (P suffix) | Lower thermal resistance vs. glass-body variants (e.g., 1N4749AG), improving power handling |
| Tape-and-reel packaging (TR12) | Standard EIA-296 format supporting automated SMT placement despite axial-leaded form factor |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in assembly |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stable 24 V reference for linear regulator feedback or ADC reference divider networks. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference providing precise DC bias point. Use Value: ±5% VZ tolerance and 25 Ω ZZT ensure <±0.15 V output variation across 5–15 mA operating range. | Use Scenario: Clamping transient spikes on 24 V rail in automotive body control modules. IC Role / Device Role / Timing Role: Shunt protector diverting excess energy to ground during load dump events. Use Value: 190 mA ISM rating and 1.0 W power dissipation support single-event clamping without degradation. |
| Voltage Monitor Threshold | Industrial Sensor Excitation |
Use Scenario: Setting trip point for undervoltage lockout (UVLO) in 24 V PLC I/O modules. IC Role / Device Role / Timing Role: Precision threshold detector via comparator input biased by regulated Zener node. Use Value: Low 5 μA IR at 18.2 V ensures minimal current draw in high-impedance sensing paths. | Use Scenario: Providing stable excitation voltage for 4–20 mA current-loop pressure transducers. IC Role / Device Role / Timing Role: Low-noise, temperature-stable bias source for bridge sensor interfaces. Use Value: –65°C to +150°C operating range and JEDEC-registered characterization enable field-deployed reliability. |
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%, 1.0 W, DO-41, but with Pb-free matte-tin plating and no TR12 tape-and-reel packaging | Requires manual or bulk loading instead of automated pick-and-place | Select when RoHS compliance is required but reel packaging is unnecessary |
| MMSZ4702T1G | Surface-mount SOD-123 package, same 24 V ±5%, 500 mW rating, 30 Ω ZZT, 10 μA IR at 18.2 V | Limited to lower-power applications due to 0.5 W rating and higher impedance | Select for space-constrained PCBs where thermal mass and surge capability are secondary to footprint |
Compared with 1N4749APE3/TR12, 1N4749A-T offers identical electrical specs but lacks tape-and-reel convenience, while MMSZ4702T1G trades power handling and surge robustness for miniaturization-making the 1N4749APE3/TR12 optimal for high-reliability through-hole regulation where board-level automation and thermal margin are critical.
Availability
1N4749APE3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and sensor interface circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4749APE3/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 1N47xxAP series was engineered for ruggedized voltage regulation in harsh-environment systems, emphasizing thermal stability, ESD immunity, and MIL-qualified screening options.
FAQ
What is the Zener voltage tolerance of the 1N4749APE3/TR12?
The 1N4749APE3/TR12 has a nominal Zener voltage of 24 V with a ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. 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 ±2°C, 90 s after current application). The tolerance is guaranteed across the full operating temperature range.
Does the 1N4749APE3/TR12 require dry packing before reflow soldering?
No, the 1N4749APE3/TR12 does not require dry packing prior to soldering. It is moisture-sensitive level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ambient conditions without baking. Its plastic encapsulation and void-free epoxy body eliminate moisture absorption concerns that would otherwise mandate dry pack or floor-life controls.
What is the maximum surge current rating for the 1N4749APE3/TR12?
The 1N4749APE3/TR12 is rated for a maximum non-repetitive surge current (ISM) of 190 mA, measured using a 1/120 second half-sine waveform at 25°C ambient. This rating applies to short-duration transients such as inductive kickback or load dump events, and must be derated per the device's power derating curve when ambient or lead temperature exceeds 25°C.
Can the 1N4749APE3/TR12 be used in surface-mount designs?
The 1N4749APE3/TR12 itself is an axial-leaded DO-41 device and is not surface-mount compatible. However, Microsemi offers direct functional equivalents in SMD packages: the SMAJ4749A (SMA) and MLL4749A (SOD-123) share identical 24 V ±5% regulation and 1.0 W rating. These alternatives require separate part numbers and layout adaptation but maintain electrical equivalence.
What does the "TR12" suffix indicate in 1N4749APE3/TR12?
"TR12" denotes tape-and-reel packaging per EIA-296 standard, with 12 mm tape width and component orientation optimized for automated pick-and-place equipment. The "e3" suffix confirms RoHS-compliant matte-tin terminal plating, while "P" specifies plastic encapsulation. Together, 1N4749APE3/TR12 identifies a fully compliant, production-ready Zener diode variant with logistics and assembly support built in.
1N4749APE3/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:
- ±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/TR12 FAQ
1.How can I place an order for 1N4749APE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4749APE3/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 1N4749APE3/TR12 reliable?
The price and inventory of 1N4749APE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4749APE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4749APE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4749APE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4749APE3/TR12?
1N4749APE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4749APE3/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 1N4749APE3/TR12?
For technical support, including 1N4749APE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4749APE3/TR12 requirements.
6.How does Aetrix verify that 1N4749APE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4749APE3/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 1N4749APE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4749APE3/TR12?
All 1N4749APE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4749APE3/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 1N4749APE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4749APE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4749APE3/TR12 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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