Analog Devices Inc. LT1813CDD#PBF

Overview

LT1813CDD#PBF from Analog Devices (formerly Linear Technology) is a dual, low-power, high-speed voltage-feedback operational amplifier with 100MHz gain bandwidth, 750V/µs slew rate, and ±3.5V input common-mode range on ±5V supplies. It delivers ±40mA output current into 100Ω loads and operates from –40°C to 85°C, enabling use in video amplification, active filters, and cable driver circuits where precision, speed, and capacitive-load stability are critical.

For engineers reviewing the LT1813CDD#PBF datasheet, LT1813CDD#PBF pinout, LT1813CDD#PBF application, or LT1813CDD#PBF equivalent, key selection criteria include unity-gain stability with up to 1000pF capacitive load, 8nV/√Hz input noise, 1.5mV max input offset voltage, and compatibility with single 5V or dual ±5V supplies in space-constrained DFN packaging.

Technical Context

The LT1813CDD#PBF employs a voltage-feedback topology with current-feedback slewing behavior, achieved via complementary NPN/PNP input followers driving an internal resistor whose voltage sets mirrored current into a high-impedance gain node. Its internal compensation dynamically adapts to capacitive load-sensing the output pole and adding frequency-dependent correction-to maintain stability across 0–1000pF.

Input bias currents are partially cancelled by parallel NPN/PNP base connections, yielding low 4µA max input bias and 400nA max offset current. The output stage uses complementary emitter followers buffered by a bootstrapped RC network that unloads under heavy drive, preserving phase margin and enabling robust transient response without external compensation.

Key Specifications

Pinout & Package

LT1813CDD#PBF is housed in an 8-lead 3mm × 3mm × 0.8mm plastic DFN package (DD) with exposed metal pad internally connected to V–. The package features fine-pitch leads and thermal performance optimized for surface-mount assembly and heat dissipation in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual high-speed op-amp applications.

Compared with ADA4897-2ARMZ and OPA2355DGKR, the LT1813CDD#PBF uniquely combines 100MHz bandwidth, 750V/µs slew rate, unity-gain stability with 1000pF, and –40°C to 85°C qualification-making it the only option among the three for ruggedized video, instrumentation, and industrial cable-driving applications requiring both speed and unconditional stability.

Availability

LT1813CDD#PBF is available at Aetrix Electronics and suitable for video amplification, active filter design, and cable driver applications requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for LT1813CDD#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 high-performance analog portfolio, emphasizing precision, speed, and reliability in signal conditioning ICs.

The LT1813 product line was designed specifically for dual-channel, low-power, high-speed amplification in space-constrained industrial and video systems where traditional op-amps fail to balance bandwidth, slew rate, and capacitive-load stability.

FAQ

What is the maximum capacitive load the LT1813CDD#PBF can drive while remaining stable?

The LT1813CDD#PBF is unity-gain stable with capacitive loads from 0pF to 1000pF across its full operating temperature range. This capability is enabled by internal adaptive compensation that senses the load-induced output pole and adjusts correction dynamically-eliminating the need for external isolation resistors in cable driver or ADC buffer applications. Stability is verified per manufacturer test conditions in the LT1813/LT1814 datasheet Figure 18 (G18).

Does the LT1813CDD#PBF support single-supply operation?

Yes, the LT1813CDD#PBF operates from a single 5V supply with rail-to-rail output swing from 1.1V to 3.9V into a 100Ω load referenced to 2.5V. Input common-mode range extends from 0.8V to 4.2V under these conditions, supporting direct interfacing with 3.3V logic and unipolar sensors. Full specifications-including 750V/µs slew rate and 100MHz GBW-are guaranteed for both single 5V and dual ±5V configurations.

What is the thermal performance of the LT1813CDD#PBF in its DFN package?

The LT1813CDD#PBF in the 3mm × 3mm DFN (DD) package has a junction-to-ambient thermal resistance (θJA) of 160°C/W. With a maximum junction temperature (TJMAX) of 125°C and ambient temperature up to 85°C, the device supports up to ~250mW total power dissipation-sufficient for dual-channel operation at 3.6mA per amplifier on ±5V supplies (180mW quiescent). The exposed V– pad must be soldered to a minimum 100mm² copper pour for optimal thermal conduction.

How does the LT1813CDD#PBF achieve low input bias current despite using bipolar input transistors?

The LT1813CDD#PBF achieves low input bias current (±4µA max) by connecting NPN and PNP bipolar transistors in parallel at each input. Their base currents oppose in polarity, providing first-order cancellation. While beta mismatch causes net bias current polarity to vary, the tightly controlled 400nA max input offset current ensures predictable DC error-especially when balanced source impedances are used to minimize voltage drop asymmetry.

Can the LT1813CDD#PBF be used as a comparator?

No-the LT1813CDD#PBF is not intended for comparator operation. Although its inputs tolerate ±6V differential voltage transiently, sustained differential input causes excessive internal current (up to 40mA) and power dissipation, risking thermal damage. The amplifier's internal compensation and lack of saturation recovery circuitry result in slow, unpredictable response outside linear closed-loop operation. For comparator functions, dedicated devices such as the LT1719 or LTC6702 should be used instead.