Analog Devices Inc. LT1389BCS8-4.096#TRPBF

Overview

LT1389BCS8-4.096#TRPBF from Analog Devices (formerly Linear Technology) is a nanopower precision shunt voltage reference delivering 4.096V nominal output with ±0.075% initial accuracy, 50ppm/°C max temperature coefficient, and 0.75Ω typical dynamic impedance at 1.5µA operating current. It operates from 0°C to 70°C in an SO-8 package and targets high-accuracy, ultra-low-power analog signal conditioning in portable instrumentation.

For engineers reviewing the LT1389BCS8-4.096#TRPBF datasheet, LT1389BCS8-4.096#TRPBF pinout, LT1389BCS8-4.096#TRPBF application, or LT1389BCS8-4.096#TRPBF equivalent, key selection criteria include guaranteed drift over temperature, sub-1µA minimum operating current, low-frequency noise (80µV_P-P), and compatibility with capacitive loads without external compensation.

Technical Context

The LT1389BCS8-4.096#TRPBF uses trimmed thin-film resistors and advanced curvature correction to achieve stable 4.096V regulation across temperature. Its bandgap-based shunt architecture maintains regulation down to 1µA minimum operating current and exhibits no negative resistance regions-ensuring reliable start-up in buffered reference circuits.

It achieves low hysteresis via optimized packaging and process control, and its reverse dynamic impedance remains below 3Ω over 1.5µA–2mA current range. The device is stable with up to 0.1µF capacitive load and requires no output compensation capacitor under standard conditions.

Key Specifications

Pinout & Package

LT1389BCS8-4.096#TRPBF is housed in an 8-lead plastic SO (narrow, 0.150") package per LTC DWG #05-08-1610. Pins 1, 2, 3, 5, and 6 are DNC (Do Not Connect) terminals-internally connected and electrically isolated from functional circuitry. External connection to these pins introduces leakage paths that degrade accuracy.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt voltage reference applications.

Compared with LT1389BCS8-4.096#TRPBF, LT1634BCS8-4.096 offers tighter initial accuracy and drift at higher operating current, while REF43FH4096IDR delivers exceptional long-term stability at significantly higher quiescent power-making LT1389BCS8-4.096#TRPBF the optimal choice for nanopower, cost-sensitive, and thermally variable portable applications.

Availability

LT1389BCS8-4.096#TRPBF is available at Aetrix Electronics and suitable for portable digital multimeters, precision data acquisition systems, and calibration equipment requiring stable component supply, guaranteed parametric performance, and long-lifecycle availability.

Supply support for LT1389BCS8-4.096#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices acquired Linear Technology in 2017 and maintains its precision analog portfolio. Linear pioneered high-performance voltage references with emphasis on low power, low drift, and robust packaging.

The LT1389 family was designed specifically for nanopower, high-accuracy shunt reference applications in portable test equipment and battery-operated instrumentation-prioritizing sub-1µA operation, guaranteed temperature behavior, and layout-friendly terminal configuration.

FAQ

What is the minimum operating current for LT1389BCS8-4.096#TRPBF?

The LT1389BCS8-4.096#TRPBF has a guaranteed minimum operating current of 1µA over the full 0°C to 70°C temperature range. At 25°C, it regulates stably starting at 1.5µA, enabling use in energy-harvesting and ultra-low-power sensor nodes where supply current is tightly constrained. This value is confirmed in the Electrical Characteristics table under "Minimum Operating Current" for the 4.096V variant.

Can LT1389BCS8-4.096#TRPBF drive a capacitive load without oscillation?

Yes, the LT1389BCS8-4.096#TRPBF is stable with capacitive loads up to 0.1µF without requiring an external series resistor or compensation capacitor. Its low dynamic impedance (<3Ω) and absence of negative resistance regions prevent peaking or ringing, making it suitable for direct connection to ADC reference inputs and op-amp buffers with significant input capacitance.

How does the pin configuration of LT1389BCS8-4.096#TRPBF affect PCB layout?

The LT1389BCS8-4.096#TRPBF has five DNC pins (1, 2, 3, 5, 6) that must remain unconnected. To prevent board leakage (>2.5nA at 5V), a guard ring tied to VOUT must encircle the VOUT and GND pins. Routing traces or vias to DNC pins introduces parasitic conduction paths that directly degrade output accuracy-layout guidelines are explicitly defined in Figure 2 of the datasheet.

What is the low-frequency noise specification for LT1389BCS8-4.096#TRPBF?

The LT1389BCS8-4.096#TRPBF specifies 80µV_P-P low-frequency noise over 0.1Hz to 10Hz, measured at 1.5µA operating current. This noise level directly impacts effective resolution in high-bit ADC applications-for example, limiting peak-to-peak uncertainty to <0.02% of full-scale 4.096V, which corresponds to ~1.2 LSBs in a true 16-bit system.

Is LT1389BCS8-4.096#TRPBF pin-compatible with other LT1389 variants?

Yes, all LT1389 variants-including LT1389BCS8-1.25, LT1389BCS8-2.5, LT1389BCS8-4.096#TRPBF, and LT1389BCS8-5-share identical SO-8 pinouts and DNC pin assignments. The only differences are output voltage, initial accuracy, and temperature coefficient; no PCB redesign is needed when upgrading or downgrading within the family for voltage-scaling requirements.