Analog Devices Inc. LT1027CCH-5

Overview

LT1027CCH-5 from Analog Devices (formerly Linear Technology) is a precision 5V buried Zener voltage reference in an 8-lead TO-5 metal can package, featuring 2–3 ppm/°C max temperature coefficient, ±0.0025V initial accuracy over 0°C to 70°C, and <3 µV_P-P (0.1Hz–10Hz) low-frequency noise. It sources up to 15mA and sinks 10mA, optimized for high-resolution A-to-D converter reference inputs in industrial data acquisition systems.

For engineers reviewing the LT1027CCH-5 datasheet, LT1027CCH-5 pinout, LT1027CCH-5 application, or LT1027CCH-5 equivalent, key selection criteria include its ultra-low drift performance, Kelvin-compatible output configuration, NR pin for noise filtering, and proven stability under transient load steps typical of SAR and sigma-delta ADC reference inputs.

Technical Context

The LT1027CCH-5 employs Linear's proprietary subsurface Zener bipolar process to eliminate surface-breakdown noise and long-term instability. Its class-B NPN/PNP output stage enables sub-2µs settling time after ±10mA AC-coupled load transients - critical for 12- to 16-bit ADC sampling clocks and reference hold phases.

It integrates a dedicated Noise Reduction (NR) pin tied to the internal scaling amplifier's positive input, allowing 1µF capacitor filtering to reduce wideband RMS noise from 2.0 µV_RMS (10Hz–1kHz) to ~1.2 µV_RMS. The VTRIM pin provides ±30mV guaranteed adjustment range without degrading TC.

Key Specifications

Pinout & Package

LT1027CCH-5 is housed in an 8-lead TO-5 metal can (H package), with hermetic sealing and θ_JA = 150°C/W. Pin 1 is identified by a laser mark or dot; pins are arranged in circular layout with 0.230" pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1021CCH-5 and LT1236ACS8-5, the LT1027CCH-5 delivers superior temperature stability and lower noise essential for 14–16-bit measurement systems, while retaining pin compatibility with LT1021 in H-package - though its NR and VTRIM capabilities require updated layout and calibration routines.

Availability

LT1027CCH-5 is available at Aetrix Electronics and suitable for high-precision data acquisition, portable test equipment, and calibration instrument applications requiring stable component supply, long-term parametric consistency, and hermetic packaging for harsh environments.

Supply support for LT1027CCH-5 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 continues to manufacture and support its precision analog portfolio, including references, amplifiers, and power management ICs, with global wafer fabrication and test infrastructure.

The LT1027 series was designed specifically for high-accuracy, low-drift voltage reference needs in 12- to 16-bit data conversion systems - emphasizing Zener-based stability, fast transient recovery, and noise-reduction flexibility over generic bandgap alternatives.

FAQ

What is the operating temperature range for the LT1027CCH-5?

The LT1027CCH-5 is rated for 0°C to 70°C ambient operation, matching the "C" grade designation. This range is validated per the datasheet's absolute maximum and electrical characteristics tables, with all guaranteed parameters - including 2–3 ppm/°C temperature coefficient and 4.9975V to 5.0025V output voltage - specified across this full interval. Operation outside this range may result in uncharacterized drift or reliability risk.

Does the LT1027CCH-5 support output voltage trimming, and how is it implemented?

Yes, the LT1027CCH-5 includes a dedicated VTRIM pin that enables ±30mV guaranteed output adjustment using a 10kΩ potentiometer between VOUT and GND. The VTRIM pin presents a 20kΩ impedance and 2.5V open-circuit voltage, and trimming does not degrade the device's temperature coefficient. This feature allows system-level calibration to compensate for board-level tolerances without altering the LT1027CCH-5's intrinsic stability.

Can the LT1027CCH-5 drive capacitive loads, and what are the stability considerations?

The LT1027CCH-5 is stable with all capacitive loads when sourcing current or at no DC load, but may oscillate when sinking current into >100pF capacitance. For optimal settling time and noise performance, a 4.7µF tantalum capacitor is recommended at the output; 0.1µF ceramic capacitors are explicitly discouraged due to increased ringing. The NR pin further decouples noise without impacting stability.

How does the NR (Noise Reduction) pin on the LT1027CCH-5 function, and what capacitor value is recommended?

The NR pin on the LT1027CCH-5 connects to the positive input of the internal scaling amplifier. Connecting a 1µF Mylar (or polypropylene) capacitor from NR to GND reduces wideband RMS noise from 2.0 µV_RMS (10Hz–1kHz) to approximately 1.2 µV_RMS, and cuts 0.1–10Hz peak-to-peak noise below 3 µV. Electrolytic capacitors are prohibited due to leakage-induced voltage error - even 100nA leakage causes a 150ppm output shift.

Is the LT1027CCH-5 pin-compatible with other LT1027 variants or the LT1021 family?

Yes, the LT1027CCH-5 shares identical pinout and footprint with all H-package LT1027 variants (e.g., LT1027ACH-5, LT1027DCH-5) and is pin-compatible with the LT1021CCH-5 in the same TO-5 metal can. However, functional differences exist: LT1027CCH-5 adds NR and VTRIM functionality absent in LT1021, and offers tighter TC (2–3 ppm/°C vs. 5 ppm/°C) and lower noise - requiring validation of system-level noise and drift budgets before substitution.