描述
MacDermid Alpha Micromax 5091D PTC Thermistor Composition for Thick Film Microcircuits
Type: PTC Thermistor Composition
Application: Thick Film Microcircuits
Series: 5091D / 5092D / 5093D
Shelf Life: 6 months
Micromax 5091D is a positive temperature coefficient thermistor composition for thick film microcircuits. It offers linear resistance versus temperature response, high positive TCR, blendability with 5092D and 5093D, laser trim stability, and environmental stability. Suited to temperature sensors, compensation elements, and heaters.
Micromax 5091D from MacDermid Alpha is a positive temperature coefficient (PTC) thermistor composition designed for making PTC thermistors in thick film microcircuits using conventional thick film processing. It is part of the 5091D / 5092D / 5093D blendable series. Typical target applications include temperature sensors, temperature compensation elements, and heaters. The composition is compatible with thick film processing, laser trimming, and standard firing profiles.
The paste carries a viscosity range of 150–250 Pa.s and uses Micromax 4553 as the recommended thinner. Terminations are typically Micromax 7484 Ag/Pd prefired at 850°C; Ag Micromax 6160 has also been tested. Print with a 200-mesh stainless steel screen with 15±3 μm emulsion to a dried print thickness of 25±2 μm. Allow prints to level 5–10 minutes, then dry 10–15 minutes at 150°C. Fire on a 30-minute profile with a 10-minute peak at 850°C. Post laser trim stability is <0.3% at 25°C/1000 hrs, <0.2% at 85%RH/85°C/1000 hrs, and <0.3% at 150°C/1000 hrs. Glass encapsulation is not generally required, but Micromax 9137 or QQ550 fired at 500°C is recommended when mechanical or environmental protection is needed. Store sealed at 5–30°C; unopened shelf life is 6 months.
Genuine MacDermid Alpha Micromax Imported Stock & Technical Support
We hold regular stock of authentic MacDermid Alpha Micromax 5091D PTC thermistor composition. Original factory TDS and batch-specific COA are available on request for your thick film microcircuit programs.
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Complete TDS, COA, and regulatory documentation available
Key Features of MacDermid Alpha Micromax 5091D
- PTC thermistor composition for thick film microcircuits
- Linear dependence of resistance with temperature
- High positive TCR
- Compatible with conventional thick film processing
- Blendable with 5092D and 5093D to tune target properties
- Laser trim stability and environmental stability
- Suited to temperature sensors, compensation elements, and heaters
- Viscosity 150–250 Pa.s for screen printing
- Screen build: 200-mesh stainless steel, 15±3 μm emulsion
- Dried print thickness 25±2 μm
- Firing: 30-minute profile, 10-minute peak at 850°C
- Glass encapsulation not generally required; Micromax 9137 or QQ550 available if needed
Primary Applications
- Temperature sensors — PTC elements for thermal sensing circuits
- Temperature compensation — resistance tracking with temperature
- Heaters — self-regulating PTC heating elements
- Thick film microcircuits — chip resistor and microcircuit builds
Full Technical Specifications
| Property | Typical Value | TDS Reference |
| Product Type | PTC thermistor composition | TDS: PTC Thermistor Composition |
| Application | Chip resistor | TDS: Chip resistor |
| Solvent or Thinner | Micromax 4553 | TDS: Micromax 4553 |
| Blend Member or Series | 5091D / 5092D / 5093D | TDS: 5091D/5092D/5093D |
| Viscosity | 150 to 250 Pa.s | TDS: Brookfield HAT, 10 rpm, 25°C |
| Terminations | Micromax 7484 Ag/Pd prefired at 850°C; Ag Micromax 6160 also tested | TDS: Terminations |
| Substrate Compatibility | 96% alumina | TDS: 96% alumina |
| Screen Mesh | 200 mesh stainless steel with 15±3 μm emulsion | TDS: 200-mesh, 15±3μm |
| Dried Print Thickness | 25 ± 2 μm | TDS: 25±2μm |
| Leveling | 5 to 10 minutes at room temperature | TDS: 5-10 minutes |
| Drying Schedule | 10 to 15 minutes at 150°C | TDS: 10-15 minutes at 150°C |
| Firing Profile | 30-minute profile with 10-minute peak at 850°C | TDS: 850°C, 10 min peak, 30 min profile |
| Post Laser Trim Stability (25°C/1000 hrs) | < 0.3 % | TDS: < 0.3 |
| Post Laser Trim Stability (85%RH/85°C/1000 hrs) | < 0.2 % | TDS: < 0.2 |
| Post Laser Trim Stability (150°C/1000 hrs) | < 0.3 % | TDS: < 0.3 |
| Encapsulant | Not generally required; Micromax 9137 or QQ550 fired at 500°C if protection needed | TDS: Encapsulant |
| Shelf Life | 6 months | TDS: 6 months |
| Storage Temperature | 5 - 30 °C | TDS: 5°C - 30°C |
Note: All listed values are typical and may vary by batch. Values based on MacDermid Alpha official TDS. Independent qualification testing is required prior to production use.
Recommended Processing Conditions
| Parameter | Recommended Value | TDS Reference |
| Mixing Prior to Use | Thoroughly mix to redisperse solids | TDS: thoroughly mix |
| Screen Mesh | 200 mesh stainless steel with 15±3 μm emulsion | TDS: 200-mesh, 15±3μm |
| Dried Print Thickness | 25 ± 2 μm | TDS: 25±2μm |
| Leveling | 5–10 minutes at room temperature | TDS: 5-10 minutes |
| Drying | 10–15 minutes at 150°C | TDS: 10-15 minutes at 150°C |
| Firing | 30-minute profile with 10-minute peak at 850°C | TDS: 850°C, 10 min peak |
| Encapsulation (optional) | Micromax 9137 or QQ550 fired at 500°C, when protection is needed | TDS: Encapsulant |
| Thinner | Micromax 4553 | TDS: Micromax 4553 |
Handling and Storage Recommendations
| Storage Rules | Store tightly sealed in a clean, stable environment at 5-30°C. | TDS: 5°C - 30°C |
| Shelf Life | 6 months in unopened containers from date of shipment. | TDS: 6 months |
| Pre-use Preparation | Thoroughly mix prior to use. Some settling of solids may occur during storage. | TDS: thoroughly mix |
| Transportation | Under normal shipping conditions, no temperature control is expected. For extended transport periods, confirm product suitability. | TDS: normal shipping conditions |
Official Technical Documentation
| Document Type | Document Introduction | Document Request |
| TDS | MacDermid Alpha Micromax 5091D 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
Why is 5091D called a PTC composition?
PTC stands for positive temperature coefficient: resistance rises as temperature increases. The TDS lists linear dependence of resistance with temperature and a high positive TCR as key benefits, which makes 5091D useful for sensing, compensation, and self-regulating heating.
How is 5091D blended with other series members?
The TDS lists 5091D, 5092D, and 5093D as a blendable series. Blending lets you tune the resistance and TCR profile to match the target application without changing process conditions.
Which terminations work with 5091D?
Reported properties are based on Micromax 7484 Ag/Pd conductor prefired at 850°C. Excellent results have also been obtained with Ag Micromax 6160, prefired at 850°C.
How does 5091D behave after laser trimming?
Post laser trim stability is below 0.3% at 25°C over 1000 hours, below 0.2% at 85%RH/85°C over 1000 hours, and below 0.3% at 150°C over 1000 hours. The test used 1.5×1.5mm resistors trimmed to 1.5× initial value with a single plunge cut.
Is encapsulation needed for 5091D resistors?
In general, no. The TDS notes glass encapsulation is not required for standard use. For mechanical protection or extreme environments such as high temperature nitrogen or forming gas, Micromax 9137 or QQ550 fired at 500°C is recommended.
Can firing profile changes affect 5091D performance?
Yes. The TDS notes that longer firing profiles or higher peak temperatures will cause slight variation in resistance and TCR. For consistent results, keep the recommended 30-minute profile with a 10-minute peak at 850°C.
What thinner should be used with 5091D?
Micromax 4553 is the listed solvent or thinner. Using the recommended thinner helps keep viscosity and print behavior consistent with the TDS data.
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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.
