Resistors

Many sheet resistivities are available to the designer. The selection should be left to the factory when possible to maximize yield and reduce cost. When sheet resistivities must be specified, the overall range and tolerance requirements must be balanced to obtain the optimum choice for processing. Resistor tolerances of ±10% usually require trimming, although some designs can achieve ±5% without trimming. Resistor tolerances of less than ±2% will affect manufacturing yield in volume. For resistor tolerances ≤ 1%, please contact the factory for further design considerations to optimize yield.

1000 Hour @125°C Typical Resistor Data

Substrate Material	Resistor Film	TCR Range (ppm/°C)	Sheet RHO Ω/□ HTT	Stability
AI₂O₃,AIN, BeO	TaN₂	-125±25	25-150	<0.5%
AI₂O₃, BeO	NiCr**	0-25	50-250	<0.5%

Note: All Tests are performed in forced air convection
furnaces on un-trimmed resistors.

**Proprietary Alloy

Resistor Design and Layout Criteria

Parameter	Minimum Values
Layer to layer registration	± .0005"
Resistor Length	.002"
Resistor Width	.002"
Termination Length	.003"
Termination Width	.003"
Resistor masking overlay on conductor termination	.002"
Resistor inboard of conductor	.0005"

*Note: Resistor inboard of conductor
termination only

Resistor Trimming Styles

Style	Tolerances	Comments
Bake to Value	±10% STD, ±5% Special	Resistors must be optimized for manufacturability
Single Side Scan Cut	1-10%	Design to Accommodate 50% width reduction
Microwave Trim(Symmetrical Scan Cut)	1-10%	Design to Accommodate 50% width reduction 10% Reduction by Request
Serpentine or Single Plunge Cut	1-10%	Compensate Resistor width to accommodate laser kerfs of .0015" for Each plunge