Applications

LOCTITE® ABLESTIK QMI529HT – Conductive die-attach adhesive for bonding ICs to metal substrates in electronics manufacturing

  • Item Name: LOCTITE ABLESTIK QMI529HT
  • Manufacturer: Henkel
  • Product Category: Die attach adhesive (paste)
  • Technologies: BMI/Acrylate with silver filler
  • Applications: Die attach for IC and component attach on copper, silver-plated copper, preplated leadframes (Ni/Pd/Au), and Alloy 42
  • Color: Silver
  • Cure Type: Heat cure
  • Package Size: Contact Techniq VN for details.
  • Shelf Life: 1 year

1. Product Overview

  • Technology: BMI/Acrylate
  • Appearance: Silver
  • Filler Type: Silver
  • Cure Method: Heat cure
  • Key Benefits:
    • Excellent electrical & thermal conductivity
    • Hydrophobic & stable at high temperatures
    • High resistance to delamination & humidity
    • Void-free bondline, strong adhesion
    • Good resistance to “popcorning” after reflow

2. Applications

  • Primary Use: Die attach for IC and component assembly
  • Compatible Surfaces: Copper, silver-plated copper, pre-plated leadframes (Ni/Pd/Au), Alloy 42
  • Designed as: Soft-solder replacement or for high UPH (Units Per Hour) applications

3. Typical Properties

Property Value
Uncured Properties
Viscosity (5 rpm @ 25°C) 18,500 cP
Thixotropic Index 4.8
Specific Gravity 4.1
Pot Life (@ 25°C) 24 hours
Shelf Life (@ -40°C) 365 days
Curing Performance
Snap Cure (Single Zone) 60 sec @ 185°C
Alternate Snap Cure 170-200°C for 70 sec (7-zone profile)
Oven Cure 30 min @ 185°C / 30 min @ 200-220°C (for higher adhesion)
Cured Properties
Coefficient of Thermal Expansion (CTE) 53 ppm/°C (below Tg), 156 ppm/°C (above Tg)
Glass Transition Temperature (Tg) 3.3°C
Thermal Conductivity 6.5 W/(m·K)
Tensile Modulus (@ 25°C) 3,300 N/mm² (478,500 psi)
Extractable Ionic Content (ppm) Cl-, K+, Na+, F- ≤ 20 ppm
Electrical Properties
Volume Resistivity 4 × 10⁻⁵ ohm-cm
Performance
Die Shear Strength (300×300 mil die on Ag/Cu LF) 57 kg-f (@ 25°C), 21 kg-f (@ 245°C)

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