Nanopower dual comparator for always-on threshold sensing
The Texas Instruments TLV3402IDR is a dual general-purpose comparator. Its maximum quiescent current is 950 nA per channel. Propagation delay is 300 µs maximum, which rules out high-speed PWM feedback or fast overcurrent detection but is perfectly adequate for temperature thresholds, pressure switch debounce, battery undervoltage lockout, and other slow-loop monitoring tasks. The -40°C to 125°C operating temperature range suits outdoor telecom cabinets, engine-bay electronics, and factory-floor enclosures where the ambient can swing hard. CMRR is 88 dB typical and PSRR is 105 dB typical, giving the part solid immunity to common-mode noise and supply ripple — useful when the comparator shares a rail with a motor drive or relay coil that injects transients.
What the 950 nA quiescent means for your BOM
The 950 nA maximum quiescent current is the part's defining spec. In a battery-powered design drawing 10 µA in sleep mode, this comparator adds less than 10% to the idle budget. That lets you keep the comparator powered continuously for wake-on-threshold without a discrete enable FET or a second low-dropout regulator. The trade-off is speed: 300 µs propagation delay means you cannot use this part for cycle-by-cycle current limiting in a 100 kHz switching supply. For that role, the TLV9032DDFR — a push-pull, rail-to-rail comparator with 100 ns delay — is the faster sibling, though it draws significantly more supply current.
Lifecycle and sourcing reality
The TLV3402IDR carries an Active lifecycle status and is ROHS3 compliant. No NRND or last-time-buy notice is on record. The part is available through independent distribution and is quoted to order against an RFQ.
Package and mounting
Housed in an 8-SOIC package with 0.154-inch body width and 3.90 mm footprint. Surface-mount only. The Tape & Reel (TR) format is the production reel; Cut Tape (CT) is available for prototyping or low-volume builds. The open-drain output means an external pull-up resistor to the logic supply rail is required — factor that into the BOM resistor count.