Texas Instruments LM614 MDC

Overview

LM614 MDC from Texas Instruments is a monolithic quad operational amplifier with integrated adjustable voltage reference in a 16-pin SOIC package. It delivers 450 μA total supply current, supports 4 V to 36 V single-supply operation, and provides rail-to-rail–compatible output swing (V−+0.8 V to V+−1.4 V) alongside a programmable reference (1.2 V to 5.0 V) for precision signal conditioning in transducer bridge circuits.

For engineers reviewing the LM614 MDC datasheet, LM614 MDC pinout, LM614 MDC application, or LM614 MDC equivalent, this device is selected for low-power, wide-input-range analog front-ends where simultaneous op-amp gain/conditioning and stable local reference generation are required-especially in industrial sensor interfaces and data acquisition systems with large common-mode signals.

Technical Context

The LM614 MDC integrates four independent high-input-impedance (3.8 GΩ common-mode) op-amps with lateral PNP input stages enabling ±36 V differential input tolerance and rail-swing capability down to V−+0.8 V. Its internal voltage reference uses a band-gap shunt topology with 1.244 V nominal cathode-feedback voltage, programmable via external resistors on the FEEDBACK pin.

Each op-amp features 0.8 MHz gain-bandwidth product, ±0.7 V/μs slew rate (LM614I grade), and 95 dB common-mode rejection at 25°C. The reference maintains ≤1 Ω dynamic output impedance, ±2.0% initial tolerance, and <150 ppm/°C temperature drift across −40°C to +85°C, supporting stable biasing under capacitive loads up to 3 mA.

Key Specifications

Pinout & Package

LM614 MDC is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with standard 1.27 mm pitch and gull-wing leads. Pin numbering follows TI's standard dual-inline convention with Pin 1 marked by a dot or bevelled corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad op-amp + reference applications.

Compared with LM324DR and TLV2464IDR, the LM614 MDC uniquely combines wide-supply quad op-amps with a programmable reference in one package-enabling compact, low-drift, single-supply analog subsystems without external reference design overhead.

Availability

LM614 MDC is available at Aetrix Electronics and suitable for transducer bridge drivers, process flow signal conditioners, and power supply monitors requiring stable component supply, long-lifecycle assurance, and industrial-grade temperature performance.

Supply support for LM614 MDC 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision amplifiers and voltage references.

The LM614 MDC belongs to TI's Super-Block™ family-designed specifically to reduce board space and system cost in industrial sensing and data acquisition by integrating multiple analog functions into monolithic ICs.

FAQ

What is the operating temperature range for the LM614 MDC?

The LM614 MDC is rated for −40°C to +85°C junction temperature, matching the LM614I industrial grade specification. This range is validated per TI's production test limits and supports deployment in harsh environments such as factory automation controllers, outdoor environmental sensors, and motor drive feedback circuits where ambient temperatures exceed commercial-grade limits. The LM614 MDC maintains specified parameters-including reference drift <150 ppm/°C and op-amp input bias current ≤35 nA-across this full range.

Can the LM614 MDC reference output be set to exactly 2.5 V?

Yes, the LM614 MDC reference output (VRO) can be precisely set to 2.5 V using external resistors on the FEEDBACK pin. With the internal cathode-feedback voltage fixed at 1.244 V, a resistor divider network (e.g., R1 = 49.9 kΩ from cathode to FEEDBACK, R2 = 50.5 kΩ from FEEDBACK to anode) yields VRO = 2.5 V ±2.0% initial tolerance. TI's Application Note SNOSC21C Figure 52 confirms this configuration, and the reference remains stable with load currents from 17 μA to 20 mA and capacitive loads up to 3 mA.

Does the LM614 MDC require external compensation for stability?

No, the LM614 MDC op-amps are internally compensated for unity-gain stability with capacitive loads up to 50 pF. For larger capacitive loads (e.g., >100 pF), TI recommends adding a small series resistor (≥20 Ω) between the op-amp output and the load to isolate the capacitance-verified in Figure 27 and Figure 29 of the datasheet. The integrated reference also exhibits inherent AC stability across 20 μA–3 mA load currents without added compensation, as shown in Figure 8.

How does the LM614 MDC handle input voltages beyond the supply rails?

The LM614 MDC tolerates differential input voltages up to ±36 V and common-mode voltages from V− to (V+ −1.8 V). Its lateral PNP input stage has no input clamping diodes to V+, allowing inputs to safely exceed V+ by up to a diode drop (≈0.7 V) without damage or phase reversal. However, pins must not exceed absolute maximum ratings: −0.3 V below V− or >36 V above V−. This robustness enables direct interface with unconditioned transducer outputs and high-side current sense signals.

Is the LM614 MDC pin-compatible with other TI quad op-amps like the LM324?

No, the LM614 MDC is not pin-compatible with the LM324 or LM2902. While both are 14-pin SOIC quad op-amps, the LM614 MDC uses a 16-pin SOIC package to accommodate its integrated reference (pins 8, 11, 16) and requires different pin assignments-for example, V− is on Pin 4 (not Pin 11), and the reference cathode is on Pin 16. Attempting LM324 footprint reuse would result in incorrect power, reference, and signal connections. Always use the LM614-specific layout per TI's DW package drawing.