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Microchip Technology 1N4749CP/TR12
- Part No.:
- 1N4749CP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4749CP/TR12.pdf
- Description:
- DIODE ZENER 24V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,141
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Product details
Overview
1N4749CP/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 190 mA maximum regulator current (IZM) at 50°C - used for precision voltage reference and overvoltage protection in linear power supplies and analog sensor interfaces.
For engineers reviewing the 1N4749CP/TR12 datasheet, 1N4749CP/TR12 pinout, 1N4749CP/TR12 application, or 1N4749CP/TR12 equivalent, key selection criteria include Zener voltage stability across temperature (−65°C to +150°C), low knee impedance (38 Ω at IZK = 0.25 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR12) for automated assembly.
Technical Context
This axial-leaded Zener operates in reverse breakdown to maintain stable voltage regulation under varying load and temperature conditions. It features a sharp breakdown knee (verified by dual-point Zener impedance measurement per MicroNote 202) and exhibits −6 mV/°C temperature coefficient near 24 V, enabling predictable drift compensation in reference circuits.
Designed for through-hole mounting on FR4 PCBs with 1 oz copper, it delivers 1.0 W steady-state dissipation at TA < 45°C or TL < 105°C (3/8″ lead length), with thermal resistance of 105°C/W junction-to-ambient and 45°C/W junction-to-lead - critical for thermal design in compact power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V ±5% at IZT = 10.5 mA, TL = 25°C - defines nominal regulation point for feedback networks and clamp thresholds |
| Power Dissipation | 1.0 W at TL < 105°C or TA < 45°C - sets maximum continuous power handling on standard PCB layouts |
| Dynamic Impedance | 25 Ω at IZT = 10.5 mA - determines output voltage variation under load transients |
| Max Regulator Current | 190 mA at TA = 50°C - establishes upper limit for shunt current in voltage reference designs |
| Knee Impedance | 38 Ω at IZK = 0.25 mA - ensures stable regulation even at low bias currents typical in sensor biasing |
| Reverse Leakage | 5 μA max at VR = 18.2 V - guarantees minimal quiescent current in high-impedance monitoring circuits |
| Forward Voltage | 1.2 V max at IF = 200 mA - supports use as polarity-protected rectifier in auxiliary 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 | Non-banded end | Connected to lower-potential node; forward conduction path when biased positively relative to cathode |
| Cathode | Banded end | Connected to higher-potential node during Zener operation; defines regulated output node in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered construction | Fully compliant with 1N47xxA series mechanical and electrical standards - ensures interchangeability with legacy designs |
| Moisture sensitivity level | Level 1 per IPC/JEDEC J-STD-020B - eliminates dry-pack requirement and simplifies SMT line handling |
| ESD robustness | Nonsensitive per MIL-STD-750 Method 1020 - withstands handling without special ESD controls |
| Tape-and-reel packaging | EIA-296 compliant TR12 format - enables direct use in high-speed pick-and-place equipment |
| Thermal performance | 45°C/W junction-to-lead (3/8″ lead length) - supports reliable derating in thermally constrained enclosures |
Applications
| Power Supply Reference | Sensor Biasing |
|---|---|
Use Scenario: Stabilizing feedback voltage in discrete linear regulators and adjustable DC-DC converter error amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 24 V setpoint for op-amp comparator or error amplifier input. Use Value: Maintains ±5% regulation over 1–190 mA load range and −65°C to +150°C ambient, reducing need for trimming resistors. | Use Scenario: Supplying stable excitation voltage to bridge-based pressure or strain sensors. IC Role / Device Role / Timing Role: Low-drift Zener reference source for ratiometric sensor signal conditioning. Use Value: 38 Ω knee impedance ensures stable bias at microamp-level currents, minimizing offset drift in instrumentation amplifiers. |
| Overvoltage Clamp | Signal Level Translation |
Use Scenario: Protecting microcontroller I/O pins and analog front-ends from transient surges exceeding 24 V. IC Role / Device Role / Timing Role: Fast-acting shunt clamp absorbing energy during ESD or inductive kick events. Use Value: 190 mA IZM and 750 mA surge rating (½-sine, 1/120 s) provide robust transient suppression without crowbar triggering. | Use Scenario: Shifting logic-level signals between 3.3 V and 5 V domains using passive Zener clamping. IC Role / Device Role / Timing Role: Bidirectional voltage limiter defining upper rail for level-shifted digital signals. Use Value: Sharp 24 V breakdown and low 25 Ω dynamic impedance ensure clean, repeatable clamping with minimal signal distortion. |
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" suffix → glass-body DO-35 package; higher thermal resistance (junction-to-ambient ≈ 150°C/W vs. 105°C/W) | Limited to lower-power or free-air applications; unsuitable for high-density PCBs requiring thermal management | Select 1N4749CP/TR12 for plastic DO-41 reliability, RoHS compliance, and superior board-level thermal performance |
| MMSZ4702T1G | Surface-mount SOD-123 package; 24 V ±5%, 500 mW rating; 30 Ω ZZT at 10 mA | Lower power handling (0.5 W vs. 1.0 W); requires rework of layout and assembly process | Choose MMSZ4702T1G only when space-constrained PCBs mandate SMT; retain 1N4749CP/TR12 for through-hole production and thermal headroom |
Compared with 1N4749A and MMSZ4702T1G, the 1N4749CP/TR12 offers optimal balance of 1 W power capability, DO-41 mechanical robustness, JEDEC-standardized pin spacing, and TR12 tape-and-reel readiness - making it the preferred choice for industrial power supply and sensor interface designs requiring proven reliability and ease of integration.
Availability
1N4749CP/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, analog sensor interfaces, and overvoltage protection circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for 1N4749CP/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 developed to deliver JEDEC-standardized, high-stability Zener regulation in ruggedized plastic packages - targeting cost-sensitive yet mission-critical applications where thermal resilience and moisture immunity are essential.
FAQ
What is the Zener voltage tolerance of the 1N4749CP/TR12?
The 1N4749CP/TR12 has a nominal Zener voltage of 24 V with a tolerance of ±5%, as indicated by the "A" suffix in its JEDEC designation. This tolerance is specified at TL = 25°C and applies across the full operating temperature range of −65°C to +150°C, ensuring predictable regulation in industrial environments.
Does the 1N4749CP/TR12 meet RoHS requirements?
Yes, the 1N4749CP/TR12 is RoHS compliant, confirmed by the "e3" suffix in Microsemi's official documentation and its matte-tin terminal plating per MIL-STD-750 Method 2026. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits.
What is the maximum continuous power dissipation for the 1N4749CP/TR12 on a standard PCB?
The 1N4749CP/TR12 delivers 1.0 W steady-state power dissipation when mounted on an FR4 PCB with 1 oz copper, 4 mm² copper pads, and 1 mm track width (25 mm length), provided ambient temperature remains below 45°C - per Microsemi's thermal characterization data.
How is polarity marked on the 1N4749CP/TR12?
The 1N4749CP/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) during Zener regulation. This marking is laser-etched or molded into the DO-41 plastic body and visible under standard inspection lighting.
What does the "TR12" suffix signify in 1N4749CP/TR12?
The "TR12" suffix indicates EIA-296 standard tape-and-reel packaging containing 12,000 units per reel - optimized for high-volume automated assembly. This format includes carrier tape with embossed pockets, cover tape with heat-seal adhesive, and standardized reel dimensions compatible with all major pick-and-place platforms.
1N4749CP/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:
- ±2%
- 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)
1N4749CP/TR12 FAQ
1.How can I place an order for 1N4749CP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4749CP/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 1N4749CP/TR12 reliable?
The price and inventory of 1N4749CP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4749CP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4749CP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4749CP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4749CP/TR12?
1N4749CP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4749CP/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 1N4749CP/TR12?
For technical support, including 1N4749CP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4749CP/TR12 requirements.
6.How does Aetrix verify that 1N4749CP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4749CP/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 1N4749CP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4749CP/TR12?
All 1N4749CP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4749CP/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 1N4749CP/TR12 part is unused and in its original packaging.
Return procedure for 1N4749CP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4749CP/TR12 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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MM5Z5V1ST1G
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