描述
MacDermid Alpha Micromax 1749R Precision Resistor Paste for Resistor Networks
Type: Resistor Paste
Pack: 100G / 1000G
Resistivity: 10Ω-1MΩ/sq
Viscosity: 145-210 Pa.s
Firing: 850°C / 60 min
Shelf Life: 6 months
MacDermid Alpha Micromax 1749R is a screen-printable resistor composition engineered specifically for precision resistor network applications. Offering 10Ω/sq to 1MΩ/sq sheet resistivity with TCR below 100 ppm/°C and post-trim stability under 0.5% ΔR, optimized for 850°C air firing in high reliability hybrid circuits.
Part of the Micromax Series 1700 materials system, Micromax 1749R is a precision resistor paste formulated specifically for resistor network applications in high reliability hybrid circuits. This composition delivers TCR values below 100 ppm/°C even with blended resistor formulations, and maintains stable performance across variations in firing temperature, peak hold time, and resistor geometry — making it a dependable choice for precision network designs.
With a sheet resistivity range spanning 10Ω/sq to 1MΩ/sq, Micromax 1749R supports multi-value resistor networks across diverse resistance requirements. The paste is optimized for 200-mesh stainless steel screens with 12-18 μm emulsion thickness, producing a dried film thickness of 22-28 μm. It undergoes a 60-minute air firing cycle with a 10-minute peak hold at 850°C and is fully compatible with Micromax 7484R Ag/Pd conductor terminations on 96% alumina substrates. Available in 100G and 1000G containers.
Genuine MacDermid Alpha Micromax Imported Stock & Technical Support
We maintain stable inventory of authentic MacDermid Alpha Micromax 1749R resistor paste. Factory-original TDS and batch-specific COA can be provided upon request for your precision resistor network projects.
Request Sample, TDS & Quotation
Complete TDS, COA, and regulatory documentation available
Key Features of MacDermid Alpha Micromax 1749R
- Formulated for precision resistor networks — engineered for multi-value network designs requiring consistent across-network performance
- Wide resistivity range of 10Ω/sq to 1MΩ/sq — versatile coverage for complex resistor network configurations
- TCR below 100 ppm/°C — stable temperature coefficient even with blended resistor formulations
- Post-laser trim stability under 0.5% ΔR — consistent final resistor values after trimming operations
- Low process sensitivity — tolerates variations in firing profile and geometry for reliable production
- Optimized for 850°C air firing — 60-minute cycle with 10-minute peak hold for repeatable results
- Compatible with Micromax 7484R Ag/Pd terminations — validated with silver/palladium conductor systems
- RoHS and REACH compliant — meets international environmental regulations
Primary Applications
- Precision resistor networks — multi-resistor arrays requiring consistent performance across all network elements
- High reliability hybrid microcircuits — resistor networks for critical applications demanding long-term stability
- Instrumentation and measurement systems — precision resistive elements for test and measurement equipment
- Aerospace and defense electronics — reliable resistor network components for mission-critical systems
Full Technical Specifications
| Property | Typical Value | Test / Reference |
| Product Type | Thick film resistor paste | — |
| Application | Precision resistor networks, high reliability hybrid circuits | — |
| Packaging Specification | 100G, 1000G | Standard packaging |
| Resistivity Range | 10Ω-1MΩ/sq | 1.5mm × 1.5mm geometry |
| Viscosity (Brookfield HAT 10 rpm) | 145-210 Pa.s | SC4-14/6R, 25°C |
| Recommended Mesh | 200 mesh | Stainless steel |
| Emulsion Thickness | 12-18 μm | — |
| Recommended Film Thickness | 22-28 μm | Dried thickness |
| Drying Time | 10-15 min | 150°C |
| Drying Temperature | 150°C | — |
| Firing Peak Temperature | 850°C | 10 min at peak, 60 min total |
| TCR Performance | <100 ppm/°C | 25-125°C / -55-25°C |
| Post Laser Trim Stability | <0.5% ΔR | All standard test conditions |
| Process Sensitivity | Low | Firing temperature, time, geometry |
| Termination Compatibility | Micromax 7484R Ag/Pd conductor | Prefired at 850°C |
| Substrate Compatibility | 96% alumina | — |
| Encapsulant | Glass encapsulation not required (QQ550 recommended for extreme environments) | — |
| Environmental Compliance | RoHS, REACH | — |
| Shelf Life | 6 months in unopened containers | — |
| Storage Temperature | 5-30°C | — |
Note: All listed values are typical and may vary by batch. Independent qualification testing is required prior to production use.
Recommended Processing Conditions
| Parameter | Recommended Value |
| Mixing Prior to Use | Slow gentle hand-stirring, 1-2 minutes |
| Optimal Printing Temperature | 20-23°C |
| Screen Mesh | 200 mesh stainless steel |
| Emulsion Thickness | 12-18 μm |
| Dried Film Thickness | 22-28 μm |
| Leveling Time | ≥10 minutes at room temperature |
| Drying Temperature | 150°C |
| Drying Time | 10-15 minutes |
| Firing Peak Temperature | 850°C |
| Total Firing Cycle | 60 minutes (10 min at peak) |
| Firing Atmosphere | Air |
| Substrate | 96% alumina |
| Termination | Micromax 7484R Ag/Pd conductor |
| Resistor Geometry | 1.5mm × 1.5mm |
Handling and Storage Recommendations
| Storage Rules | Store in tightly sealed containers in clean, stable environment at 5-30°C. |
| Shelf Life | 6 months in unopened containers from date of shipment. |
| Pre-use Preparation | Thoroughly mix prior to use. Some settling may occur during storage. |
| Thinning | Not normally required; use Micromax 4036 thinner sparingly for evaporative losses. |
Official Technical Documentation
| Document Type | Document Introduction | Document Request |
| TDS | MacDermid Alpha Micromax 1749R original factory technical data sheet | Request TDS |
| COA | Batch-specific certificate of analysis | Request COA |
| SDS | Safety Data Sheet for handling and storage | Request SDS |
Frequently Asked Questions
What is MacDermid Alpha Micromax 1749R?
Micromax 1749R is a precision resistor paste from Series 1700, designed for resistor network applications requiring TCR below 100 ppm/°C and post-trim stability under 0.5% ΔR.
What resistivity range does Micromax 1749R cover?
It covers 10Ω/sq to 1MΩ/sq, supporting diverse precision resistor network designs across multiple resistance values.
What is the viscosity of Micromax 1749R?
Viscosity is 145-210 Pa.s at 25°C (Brookfield HAT, SC4-14/6R, 10 rpm).
What firing profile is recommended for Micromax 1749R?
A 60-minute air firing cycle with 10-minute peak hold at 850°C, including 20 minutes above 800°C and 30 minutes above 600°C.
What dried film thickness is recommended for Micromax 1749R?
Recommended dried film thickness is 22-28 μm using 200 mesh screens and 12-18 μm emulsion.
How stable is Micromax 1749R after laser trimming?
Average resistance shift is below 0.5% ΔR under all standard testing conditions.
What terminations are compatible with Micromax 1749R?
Micromax 7484R Ag/Pd conductor prefired at 850°C. Other Ag/Pd compositions also work well.
What packaging options are available for Micromax 1749R?
Standard 100G and 1000G containers. Bulk supply options available upon request.
Get MacDermid Alpha Micromax 1749R Bulk Pricing and Technical Support
We supply authentic MacDermid Alpha Micromax 1749R resistor paste for precision resistor network and high reliability hybrid circuit applications. Contact our team for bulk quotations, sample availability, technical documentation, and application support.
Inquire Bulk Price & Technical Support
Disclaimer: All technical data on this page are for general guidance only and are not product specifications. Buyers must carry out independent trials and verify suitability before bulk ordering. Actual values may vary between production lots.
