JFET op-amp for precision analog signal chains in harsh environments
The Texas Instruments Excalibur™ TLE2161MJGB is a single-channel JFET-input operational amplifier in a hermetic 8-CDIP ceramic package. It delivers a gain-bandwidth product of 6.4 MHz with a 10 V/µs slew rate, drawing only 290 µA of supply current. The input bias current is 4 pA, and the input offset voltage is 600 µV. This combination of low power, high input impedance, and wide temperature range makes it suited for precision analog signal conditioning in avionics, satellite instrumentation, downhole sensing, and other high-reliability systems where the hermetic CDIP package is specified.
The 6.4 MHz gain-bandwidth product sets the small-signal bandwidth at a given closed-loop gain. At a gain of 10, the -3 dB bandwidth is approximately 640 kHz, which is adequate for conditioning sensor outputs in the 100 kHz range without significant phase shift. The 10 V/µs slew rate ensures the output can swing 10 V in 1 µs, so a 10 V peak-to-peak sine wave at 159 kHz reproduces without slew-induced distortion. For a 36 V supply rail, the full output swing at higher frequencies is slew-limited, but for typical ±15 V applications the 10 V/µs rate keeps the signal path clean for audio and low-frequency instrumentation.
290 µA supply current — power budget advantage in multi-channel systems
At 290 µA per amplifier, the TLE2161MJGB is efficient for a JFET op-amp with 6.4 MHz bandwidth. In a multi-channel data acquisition system with eight amplifiers, the total quiescent draw is under 2.4 mA, which leaves headroom for the ADC and reference on a low-power rail. The 80 mA output current per channel can drive moderate loads such as a 100 Ω feedback network or a 10 kΩ ADC input without significant thermal rise in the CDIP package.
Hermetic 8-CDIP for high-reliability and extended-temperature deployments
The 8-CDIP (0.300", 7.62 mm) ceramic dual-in-line package provides a hermetic seal against moisture and contaminants, which is required for military, aerospace, and downhole applications where conformal coating alone is insufficient. The through-hole mounting simplifies hand assembly and rework in prototype or low-volume production.
For long-life programs in defence or aerospace, the Active status combined with the hermetic package and military temperature range makes it a stable choice for the BOM.