Texas Instruments TL103WBIDR

Overview

TL103WBIDR from Texas Instruments is a dual operational amplifier with integrated 2.5V shunt voltage reference, designed for precision CC/CV feedback in high-voltage power control circuits. It delivers ±0.3mV typical input offset voltage, 1.2MHz gain bandwidth, and operates from 3V to 36V supply across –40°C to 125°C - enabling accurate battery charger and SMPS regulation.

For engineers reviewing the TL103WBIDR datasheet, TL103WBIDR pinout, TL103WBIDR application, or TL103WBIDR equivalent, this device supports isolated flyback feedback design, low-quiescent-current operation (550μA total), EMI-immune signal conditioning, and dual-amplifier + reference integration in a single SOIC-8 package.

Technical Context

The TL103WBIDR integrates two independent high-voltage op amps and a fixed 2.5V shunt reference tied to OP AMP1's noninverting input. OP AMP2 remains fully uncommitted, supporting flexible external feedback configurations. Its internal reference achieves 0.44% tolerance at 25°C and 1.04% over temperature, with cathode current capability from 0.2mA to 100mA.

This architecture enables direct implementation of constant-current/constant-voltage (CC/CV) control loops without external references or bias networks. The device features integrated RF/EMI filtering (EMIRR ≥62dB at 400MHz), rail-to-rail output swing (27.4V from 30V rail), and PSRR up to 114dB - all optimized for noisy switch-mode environments.

Key Specifications

Pinout & Package

TL103WBIDR is packaged in an 8-pin SOIC (D package), 4.9mm × 6mm body size with standard JEDEC lead pitch and thermal performance (R_θJA = 135.4°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL103WAIDR, TL103WBIDR adds EMI rejection and extends temperature range to 125°C while improving offset and reference accuracy; compared with TL431CDBVR + dual op amp, TL103WBIDR reduces footprint by >40%, eliminates inter-stage matching errors, and integrates EMI-hardened signal paths.

Availability

TL103WBIDR is available at Aetrix Electronics and suitable for battery chargers, switch-mode power supplies, and linear voltage regulation requiring stable component supply, long-term lifecycle support, and automotive-grade temperature performance.

Supply support for TL103WBIDR 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, embedded processing, and power management technologies with over 50 years of innovation in precision analog ICs.

The TL103Wx product line was developed specifically for cost-optimized, space-constrained CC/CV feedback in battery charging and isolated power supply applications - integrating reference and dual amplifiers to replace multi-component solutions.

FAQ

What is the maximum cathode current supported by TL103WBIDR?

TL103WBIDR supports a maximum cathode current of 100mA, with a typical minimum of 0.2mA required for stable 2.5V reference operation. This wide sink-current range allows direct use in high-current precision current sinks or low-power bias networks without external transistors. The reference remains stable across this full range when operated within recommended conditions, and its dynamic impedance stays below 0.8Ω.

Does TL103WBIDR require an external capacitor on the VREF pin for stability?

No, TL103WBIDR's internal shunt reference is internally compensated and does not require an external capacitor for basic stability. However, Figure 5-22 in the datasheet defines capacitive-load stability boundaries: oscillation may occur with >100nF directly at the cathode. For loads exceeding 100nF, a series resistor (e.g., 10Ω) is recommended. TL103WBIDR's stability is verified across 0.2–100mA sink currents without added capacitance.

How does the EMI rejection of TL103WBIDR improve system-level robustness?

TL103WBIDR integrates on-die RF and EMI filtering, achieving ≥75dB EMIRR at 900MHz (GSM band) and ≥88dB at 3.6GHz. This prevents demodulation of RF signals into the op amp's input stage - critical in densely packed boards with Bluetooth, Wi-Fi, or cellular modules nearby. In practice, TL103WBIDR eliminates the need for external ferrite beads or RC filters in CC/CV feedback paths, reducing board area and improving long-term reliability in EMI-prone environments.

Can TL103WBIDR operate with a single 5V supply?

Yes, TL103WBIDR operates from 3V to 36V single-supply or split-supply configurations. With a 5V supply, its internal 2.5V reference provides an accurate mid-rail voltage for biasing, and both amplifiers deliver rail-to-rail output swing (e.g., 20mV above VCC– and 27.4V below VCC+ at 30V). Input common-mode range extends to VCC– and up to VCC+ – 1.5V, ensuring full functionality in low-voltage applications like USB-powered chargers.

What is the difference between OP AMP1 and OP AMP2 in TL103WBIDR?

In TL103WBIDR, OP AMP1 has its noninverting input permanently tied to the internal 2.5V shunt reference (pin 3 = 1IN+ = VREF cathode), making it ideal for reference-based feedback loops like constant-current sensing. OP AMP2 has both inputs uncommitted (pins 5 and 6), functioning as a fully independent general-purpose amplifier for secondary regulation, monitoring, or signal conditioning - enabling dual-loop control (e.g., CC + CV) in a single IC without external reference routing.