Analog Devices Inc. LT1009S8#PBF

Overview

LT1009S8#PBF from Analog Devices (formerly Linear Technology) is a precision 2.5V shunt voltage reference in an 8-lead SO package, featuring ±5mV initial tolerance (0.2%), 0.6Ω max dynamic impedance, and guaranteed stability over 0°C to 70°C. It serves as a calibration-grade reference in analog-to-digital converters, power supply monitors, and current-loop systems.

For engineers reviewing the LT1009S8#PBF datasheet, LT1009S8#PBF pinout, LT1009S8#PBF application, or LT1009S8#PBF equivalent, key selection criteria include temperature coefficient (25 ppm/°C), trim capability (±5%), long-term drift (20 ppm/kHr), and direct interchangeability with LM136 in existing designs.

Technical Context

The LT1009S8#PBF uses on-chip laser trimming to achieve 0.2% initial accuracy and minimize temperature-induced drift. Its three-terminal architecture supports external adjustment without degrading temperature coefficient - a design feature enabling system-level calibration while preserving thermal performance.

It operates across 400μA–10mA reverse current, delivering stable 2.500V output (2.495V–2.505V min/max) with low noise (250 nV/√Hz at 10Hz) and fast response time (<10μs). The device is internally compensated and requires no external capacitors for stability in standard configurations.

Key Specifications

Pinout & Package

LT1009S8#PBF is housed in an 8-lead plastic small-outline (SO-8, narrow 0.150") package with exposed pad not connected. Pin 1 is marked by notch or dot; pins are numbered counterclockwise from top-left corner when viewed from top.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM136DR2G and LT1461ACS8#PBF, the LT1009S8#PBF uniquely balances adjustability, precision, and shunt topology compatibility - making it optimal for upgrading legacy LM136-based designs without PCB changes while improving drift and tolerance by 2.5× and 5× respectively.

Availability

LT1009S8#PBF is available at Aetrix Electronics and suitable for precision data acquisition, industrial instrumentation, and power management systems requiring stable component supply across extended production lifecycles.

Supply support for LT1009S8#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 acquired Linear Technology in 2017 and maintains its precision analog portfolio, including voltage references, op amps, and power management ICs, with focus on high-reliability industrial and aerospace applications.

The LT1009 series was designed specifically for applications demanding stable, trimmable shunt references in space-constrained layouts - targeting test equipment, process control, and embedded monitoring where LM136 compatibility and improved drift were critical.

FAQ

What is the operating temperature range for LT1009S8#PBF?

The LT1009S8#PBF is rated for operation from 0°C to 70°C. This commercial-grade temperature range is specified in the order information table and applies to all electrical characteristics unless otherwise noted. The device's 25 ppm/°C temperature coefficient is guaranteed across this full range, ensuring predictable performance in office, lab, and non-extreme industrial environments. Thermal derating is not required within these limits.

Can LT1009S8#PBF replace LM136 in existing designs without modifications?

Yes, LT1009S8#PBF is explicitly documented as directly interchangeable with LM136 for improved performance. Its pinout matches LM136 in SO-8 packaging, and the ADJ pin allows optional use of the same external trim network - or omission thereof, since no adjustments are needed for minimum temperature coefficient. No PCB layout changes are required, and the tighter 0.2% tolerance and lower 25 ppm/°C drift enhance system accuracy immediately.

What is the purpose of the ADJ pin on LT1009S8#PBF?

The ADJ pin on LT1009S8#PBF enables ±5% output voltage adjustment using an external resistor divider, allowing system-level calibration to compensate for downstream errors such as amplifier offset or sensor gain mismatch. Critically, this adjustment does not degrade the device's temperature coefficient - a key distinction from other trimmable references. The ADJ pin is functional only when used with the recommended 10kΩ potentiometer network shown in the typical application diagram.

Does LT1009S8#PBF require external capacitors for stability?

No, LT1009S8#PBF is internally compensated and does not require external capacitors for stability in standard shunt reference configurations. The datasheet confirms stable operation across its full 400μA–10mA operating current range without added capacitance. However, a 1μF bypass capacitor is recommended at the output when driving noisy loads or long traces to suppress high-frequency coupling, as demonstrated in the buffered reference application (Figure TA06).

How does LT1009S8#PBF compare to LT1019 in terms of precision and application fit?

LT1009S8#PBF offers 0.2% initial tolerance and 25 ppm/°C drift, while LT1019 achieves 0.05% tolerance and 5 ppm/°C drift - making LT1019 superior for metrology-grade applications. However, LT1009S8#PBF is a shunt device compatible with LM136 footprints and low-headroom supplies, whereas LT1019 is a series reference requiring ≥2.7V input headroom. For upgrading legacy designs or space-constrained 5V systems, LT1009S8#PBF provides the optimal balance of precision, compatibility, and simplicity.