JFET input stage, hermetic TO-99-8, military temperature range
The JM38510/11404BPA is a single-circuit JFET-input operational amplifier from the JEDEC-registered JM38510 family, packaged in a hermetic TO-99-8 metal can for through-hole mounting. Key parametric ratings include a 3V/µs slew rate, 2 mV input offset voltage, and 3.5 nA input bias current, with supply span from 10 V to 40 V and output current capability of 50 mA per channel.
Slew rate and input offset — what they mean for signal chain design
The 3V/µs slew rate sets the large-signal bandwidth: for a 10 V peak-to-peak output swing, the full-power bandwidth is roughly 48 kHz. That is sufficient for audio-frequency processing, servo loop compensation, and low-speed data acquisition, but not for video or high-speed ADC driving. The 2 mV maximum input offset is typical for a general-purpose JFET op-amp of this generation; if the application requires sub-millivolt precision, external nulling or a higher-grade device would be needed. The 3.5 nA input bias current is characteristic of a JFET input stage — orders of magnitude lower than a bipolar input — making this part a good fit for high-impedance sources such as photodiode amplifiers, pH probe buffers, and piezoelectric sensor interfaces where bias-current-induced offset errors must be minimised.
Lifecycle and compliance — still in active production
Note that the RoHS status is listed as non-compliant, which is expected for a hermetic metal-can package originally qualified for military/aerospace programs; the lead-bearing solder dip on the leads is typical and acceptable under many hi-rel procurement exemptions.
Package and mounting — through-hole TO-99-8 metal can
The TO-99-8 metal can is an 8-lead circular hermetic package with a 0.335-inch diameter base and 0.5-inch lead spacing on a 0.230-inch bolt circle. It is designed for through-hole soldering into a standard TO-99 footprint. The metal enclosure provides a hermetic seal against moisture and contaminants, which is why this package dominates in defence, space, and downhole applications where conformal coating alone is insufficient.