Vishay Thin Film Dividers

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mediatechnology
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Vishay Thin Film Dividers

Post by mediatechnology »

Vishay has thin film divider networks with close ratio and absolute matching.
They are designed for automotive use but I wonder how good their audio performance is.
They have a voltage coefficient of <0.1 ppm/V and are rated at 100 mW.

http://www.vishay.com/docs/60113/mpma.pdf
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JR.
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Re: Vishay Thin Film Dividers

Post by JR. »

I could imagine using them in my precision synthesized current sources, where the matching of the resistors matters.

They claim low voltage coefficient so low distortion.

However price at digikey is $1.68 in thousands $4.63 in onesey twosey... a bit dear for my taste.
If these prices come down they would be worth using to roll precision differentials.


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Re: Vishay Thin Film Dividers

Post by mediatechnology »

Thanks for checking the real-world pricing. Still less than some of the high-precision alternatives in bulk metal.

The press release said "$0.50 to $1 in production quantities."
Must be for really big orders.

I'm wondering if I should ask Dave Hill if he's tested these.

As I was typing this I got an e-mail from Mouser about new Vishay product.

The MELF resistors looked interesting: http://www.vishay.com/docs/28713/melfprof.pdf

Those are good to have in 10R for mic preamp phantom fault series-limiting.
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Re: Vishay Thin Film Dividers

Post by JR. »

I haven't used a single SMD resistor in years, while the quad arrays I use are not premium audio quality.

Those duals with .05% matching look like competition of the R's integrated inside the THAT I/O chipsets.but more flexible for unusual tricks.

Low distortion precision dual SMD seem very attractive, except for the price. Even $0.50 ($ 0.25 per R) seems a little pricy...

I'm paying less than a penny per array in 5k volume (one reel) for general purpose x4 arrays.

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Re: Vishay Thin Film Dividers

Post by mediatechnology »

I'm paying less than a penny per array in 5k volume (one reel) for general purpose x4 arrays.
Well, yes. Are they available in ratios other than 1:1?
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Re: Vishay Thin Film Dividers

Post by JR. »

The value of the new Vishay parts IMO are the precision and linearity, while I have not paid close attention to cost of decent SMD resistors. I know from talking with others who do that they are slightly more expensive and require larger SMD packages, while fitting 2 inside a 3 leg sot-23 is not a stretch physically. The common pin per pair is somewhat of a limitation for cost effective use of these, already pricy parts.

I suspect these are used for automotive control systems to pad down real world automotive sensor voltages to <3V for cheap onboard A/D convertors. The ratio precision and stability is probably more important to them than linearity, which may just be a nice side effect.

JR

[edit- I can't imagine a car company paying $0.50 for a pair of resistors /edit]
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