Manufacturing, DFM & DFT — question 10 of 10
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You're designing a calibrated temperature-measurement circuit that depends on a precision voltage reference with a tempco of 5 ppm/°C, calibrated at 25C, and used across an operating range of -20C to 70C. Your sourcing contact says the primary reference has a 26-week lead time, but there's a pin-compatible drop-in alternate with a tempco of 25 ppm/°C. Walk me through how you'd decide whether to qualify the alternate, and roughly how much extra calibration error it introduces across the operating range.
This one resolves to a number. Give the value in the field below and your reasoning in the box — the number is checked exactly, by arithmetic.