Texas Instruments TL751L12CD

Overview

TL751L12CD from Texas Instruments is a 12-V fixed-output, low-dropout linear voltage regulator in SOIC-8 package with TTL/CMOS-compatible enable input, 0.6 V dropout at 150 mA, ±1% output voltage accuracy over 0°C to 125°C, and integrated reverse-transient protection down to –50 V. It serves as the primary power-management IC in automotive body control modules requiring stable 12-V rail generation from noisy battery inputs.

For engineers reviewing the TL751L12CD datasheet, TL751L12CD pinout, TL751L12CD application, or TL751L12CD equivalent, key selection criteria include its 150-mA output capability, enable-controlled high-impedance shutdown mode, 60-V load-dump immunity, and SOIC-8 thermal performance (θ_JA = 97°C/W).

Technical Context

The TL751L12CD implements a PNP pass transistor architecture with internal current limiting, thermal overload protection, and overvoltage clamping. Its ENABLE pin directly controls output stage conduction-high enables regulation, low places OUTPUT in high-impedance state-enabling precise sequencing in multi-rail systems.

Designed for battery-powered environments, it features reverse-battery protection (–15 V continuous, –50 V transient), 500-μA quiescent current in disable mode, and ripple rejection of 50 dB at 120 Hz. Input voltage range is 13 V to 26 V, supporting 12-V automotive nominal systems under load-dump and cold-crank conditions.

Key Specifications

Pinout & Package

TL751L12CD uses an 8-pin SOIC (D) package (JEDEC MS-012AA), 3.94 mm × 4.90 mm footprint, 1.75 mm max height, with exposed thermal pad not electrically connected. Pin 1 is marked by beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout regulator applications.

Compared with TL750L12CD, TL751L12CD adds programmable enable control at identical cost and footprint; versus TPS7A4700RGWR, it trades noise/PSRR for integrated automotive-grade transient protection and fixed 12-V simplicity.

Availability

TL751L12CD is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and portable medical diagnostics requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant sourcing.

Supply support for TL751L12CD 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 connectivity technologies, with over 50 years of power management innovation.

The TL751L series was designed specifically for automotive and industrial battery-powered systems requiring robust, low-quiescent, enable-controllable LDOs with integrated transient protection and wide-input tolerance.

FAQ

What is the minimum input voltage required for TL751L12CD to maintain regulation?

The TL751L12CD requires a minimum input voltage of 12.6 V to sustain 12 V output at 150 mA load, based on its 0.6 V dropout specification. Below this threshold, output voltage drops linearly with input; operation below 13 V is valid only for light loads or transient conditions like cold-crank.

Can TL751L12CD be used without the ENABLE pin connected?

Yes - TL751L12CD operates normally when ENABLE is tied to VIN or a logic-high voltage ≥2 V. Leaving ENABLE floating is not recommended; it must be actively pulled high or low via a resistor or controller to prevent erratic output behavior due to noise coupling.

Does TL751L12CD require an output capacitor, and what type is specified?

Yes - TL751L12CD requires a 10-μF tantalum capacitor with ESR < 0.4 Ω on the OUTPUT pin for stability across temperature and load. Ceramic capacitors alone are insufficient; the datasheet specifies tantalum or aluminum polymer types meeting the ESR range.

How does TL751L12CD handle reverse battery connection?

TL751L12CD withstands –15 V continuously and –50 V transients (≤100 ms) without damage or latch-up, thanks to internal reverse-battery protection circuitry. This eliminates the need for an external series diode in automotive applications where polarity reversal may occur during service.

Is TL751L12CD pin-compatible with other regulators in the TL75xL family?

TL751L12CD shares the same SOIC-8 pinout with TL751L05CD, TL751L08CD, and TL751L10CD, enabling drop-in replacement across output voltages. However, TL750L variants lack ENABLE functionality and have different pin 8 behavior - they are not functionally interchangeable without schematic revision.