Analog Devices Inc. LT1027ECS8-5#PBF

Overview

LT1027ECS8-5#PBF from Analog Devices (acquired Linear Technology) is a precision 5V buried Zener voltage reference IC designed for high-accuracy A-to-D and D-to-A converter reference inputs. It delivers 5.000 V output with ±5 mV initial accuracy (±100 ppm), 3–7.5 ppm/°C max temperature coefficient, 15 mA source / 10 mA sink capability, and <3 µV_P-P (0.1–10 Hz) noise - enabling 14-bit+ system accuracy in industrial data acquisition.

For engineers reviewing the LT1027ECS8-5#PBF datasheet, LT1027ECS8-5#PBF pinout, LT1027ECS8-5#PBF application, or LT1027ECS8-5#PBF equivalent, key selection criteria include low-drift stability over 0°C to 70°C, noise reduction pin (NR) support for sub-µV filtering, Kelvin-compatible layout for trace-resistance error mitigation, and compatibility with 12–16-bit ADCs such as LTC1290 requiring fast settling (<2 µs) under load transients.

Technical Context

The LT1027ECS8-5#PBF employs Linear Technology's proprietary subsurface Zener bipolar process to eliminate surface-breakdown noise and long-term drift. Its class-B NPN/PNP output stage enables rapid transient recovery (<2 µs for ±10 mA AC load steps) while maintaining low output impedance (<0.015 Ω DC, <1 Ω at 100 kHz).

It integrates a dedicated Noise Reduction (NR) pin allowing external 1 µF capacitor to reduce wideband RMS noise from 2.0 µV to ~1.2 µV (10 Hz–1 kHz); the VTRIM pin supports ±30 mV adjustment range via 10 kΩ potentiometer without degrading TC performance.

Key Specifications

Pinout & Package

LT1027ECS8-5#PBF uses an 8-lead plastic SOIC (S8) package with 150°C/W thermal resistance and 0.150-inch narrow body. Pin 1 is VIN; pins 2–4 are NC (internally connected, no external connection); pin 5 is NR (Noise Reduction); pin 6 is GND; pin 7 is VTRIM; pin 8 is VOUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1027ECS8-5#PBF, LT1021-5CN8-5 offers tighter TC but lacks SOIC packaging and modern noise performance, while LT1461ACS8-5 trades Zener-level stability for micropower operation - making LT1027ECS8-5#PBF optimal for fixed-supply, high-accuracy, medium-power instrumentation.

Availability

LT1027ECS8-5#PBF is available at Aetrix Electronics and suitable for high-resolution data acquisition, portable calibration equipment, and precision current source designs requiring stable component supply with guaranteed long-term availability and traceable lot control.

Supply support for LT1027ECS8-5#PBF 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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.

The LT1027 series belongs to ADI's precision voltage reference product line, engineered specifically for metrology-grade accuracy in 12–16-bit data conversion systems where low drift, low noise, and fast transient response are non-negotiable.

FAQ

What is the operating temperature range for LT1027ECS8-5#PBF?

The LT1027ECS8-5#PBF is specified for operation from 0°C to 70°C ambient temperature. This grade ('E' suffix) is intended for commercial and industrial environments where extreme temperature excursions are not required. The device's 3–7.5 ppm/°C temperature coefficient is guaranteed across this full range, ensuring predictable drift behavior in data acquisition and test equipment applications.

Does LT1027ECS8-5#PBF require an external capacitor on the NR pin?

No, the NR pin on LT1027ECS8-5#PBF is optional: connecting a 1 µF capacitor to ground reduces wideband RMS noise from 2.0 µV to ~1.2 µV (10 Hz–1 kHz), but the device operates fully functional without it. The capacitor must be low-leakage (e.g., Mylar or polypropylene); electrolytics are prohibited due to leakage-induced voltage error.

Can LT1027ECS8-5#PBF drive an LTC1290 ADC reference input directly?

Yes, LT1027ECS8-5#PBF is explicitly designed for this use case: its 15 mA sourcing capability, <2 µs settling time under 10 mA transient load, and low output impedance allow direct connection to the REF+ pin of the LTC1290 12-bit ADC without buffering - as confirmed in the datasheet's Typical Application diagram TA01.

What is the purpose of the NC pins (2–4) on LT1027ECS8-5#PBF?

Pins 2–4 on LT1027ECS8-5#PBF are No Connect (NC) terminals - internally bonded but electrically isolated from active circuitry. They must remain unconnected in PCB layout to prevent parasitic coupling, capacitive loading, or unintended current paths that could degrade noise performance or long-term stability.

How does the VTRIM pin on LT1027ECS8-5#PBF affect temperature coefficient?

The VTRIM pin on LT1027ECS8-5#PBF enables ±30 mV output adjustment via external potentiometer but does not alter the device's inherent temperature coefficient. Trimming adjusts the nominal output voltage at 25°C without impacting the 3–7.5 ppm/°C drift specification - preserving system accuracy across temperature after calibration.