Adjustable shunt reference in a tiny SC-70-5
It's the ±0.5% initial-tolerance variant of the LM4041 family, which means it holds the output within half a percent at 25°C — enough for a 12-bit ADC reference or a precision comparator threshold without trimming. The shunt topology acts like a programmable Zener: it sinks current through the cathode to regulate the voltage across the load, so you need a bias resistor from the supply. Cathode current runs as low as 65 µA, making it usable in battery-powered circuits that can't spare milliamps for a series reference. Output capability is 12 mA, which covers most single-ADC or op-amp bias loads. The SC-70-5 package (also known as SOT-353) is roughly 2 mm × 2.1 mm — about the size of a grain of rice — so it fits into tight sensor modules or portable gear where board area is the constraint. Temperature coefficient is 100 ppm/°C across the -40°C to 85°C industrial range, so the output drifts about 0.8 mV per degree at a 1.233 V setpoint; fine for general-purpose regulation but not a precision metrology part.
The adjustable output is the headline feature: two resistors set the reference anywhere between the minimum 1.233 V and the maximum 10 V. That means one line item covers multiple voltage rails on the board — a 2.5 V reference for one ADC, a 4.096 V reference for another — just by changing resistor dividers. The ±0.5% tolerance is the middle grade in the LM4041 family (the A-grade is ±0.1%, the D-grade is ±1%). If your design needs better than 0.5% initial accuracy, you step up to the A-grade or move to a series reference like the LM4132. The 65 µA minimum cathode current is the floor: below that the reference drops out of regulation. Your bias resistor must be sized to deliver at least 65 µA plus the load current at the lowest supply voltage. The 100 ppm/°C drift adds about 0.25 mV over a 25°C swing at a 2.5 V output — negligible for an 8-bit ADC but worth checking for a 12-bit system.
It's ROHS3 Compliant, which covers the current EU RoHS exemption list. The NOPB suffix means it's lead-free — no lead in the solder finish — so it's compatible with lead-free reflow profiles.
The LM4041CIM7-ADJ/NOPB is an active TI part with broad distribution coverage. If your volume or lead-time requirements are tight, let us know and we'll check the open market as well.