Texas Instruments LM79L05ACTL/NOPB

Overview

LM79L05ACTL/NOPB from Texas Instruments is a fixed-output, 3-terminal negative linear voltage regulator delivering −5 V at up to 100 mA output current in a 6-bump DSBGA (YZR) package. It features ±5% output voltage accuracy over load, line, and temperature, internal short-circuit and thermal protection, and stable operation with only a 0.1 μF output capacitor. It is used in dual-rail analog supplies, industrial sensor interfaces, and low-power embedded subsystems requiring regulated negative bias.

For engineers reviewing the LM79L05ACTL/NOPB datasheet, LM79L05ACTL/NOPB pinout, LM79L05ACTL/NOPB application, or LM79L05ACTL/NOPB equivalent, key selection considerations include its −5 V fixed output, 100 mA current capability, DSBGA-6 footprint compatibility, dropout behavior under −7.3 V input, and thermal performance in compact PCB layouts.

Technical Context

The LM79L05ACTL/NOPB implements a monolithic PNP pass transistor architecture with built-in safe operating area (SOA) limiting, temperature-independent short-circuit current limit, and thermal shutdown. Its regulation loop maintains output stability across 1 mA–100 mA load range and input voltages from −7.3 V to −20 V.

It achieves maximum line regulation of 0.07% V_OUT/V and load regulation of 0.01% V_OUT/mA, with quiescent current as low as 0.1 mA at light loads. Ripple rejection exceeds 50 dB at 120 Hz, and output noise is 40–120 μV RMS (10 Hz–10 kHz).

Key Specifications

Pinout & Package

LM79L05ACTL/NOPB uses a 6-bump DSBGA (YZR) package measuring 1.09 mm × 1.88 mm × 0.76 mm (height), RoHS-compliant with SNAGCU finish and MSL Level-1 rating. The package has no exposed pad; all six bumps are functional terminals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar negative fixed-voltage regulator applications.

Compared with LM79L05ACTL/NOPB, the TO-92 variant offers easier handling and higher thermal margin in still air but occupies ~10× more PCB area; the SOIC-8 version provides superior thermal performance and standard SMT compatibility but requires more routing space and two unused pins.

Availability

LM79L05ACTL/NOPB is available at Aetrix Electronics and suitable for industrial sensor interfaces, dual-rail analog front-ends, and low-power embedded peripherals requiring stable component supply with long-term lifecycle support.

Supply support for LM79L05ACTL/NOPB 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 decades of expertise in precision linear regulators and industrial-grade IC design.

The LM79LXXAC series was engineered for cost-sensitive, space-constrained applications needing reliable fixed negative regulation - targeting instrumentation, industrial control, and legacy interface subsystems where simplicity and proven reliability are critical.

FAQ

What is the maximum input voltage for LM79L05ACTL/NOPB?

The absolute maximum input voltage for LM79L05ACTL/NOPB is −35 V. However, for proper regulation, the input must remain within −7.3 V to −20 V. Exceeding −35 V risks permanent damage, while inputs below −7.3 V cause dropout and loss of regulation. Always observe derating guidelines for thermal safety in the DSBGA package.

Does LM79L05ACTL/NOPB require an output capacitor, and what type is recommended?

Yes, LM79L05ACTL/NOPB requires a minimum 0.1 μF output capacitor for stability. A ceramic capacitor is recommended due to its low ESR and small footprint - aluminum electrolytic (1 μF) is acceptable if higher capacitance is needed for transient suppression, but not required. Placement must be within 2 mm of the output bump.

How does the DSBGA package of LM79L05ACTL/NOPB affect thermal performance?

LM79L05ACTL/NOPB in the DSBGA (YZR) package has a junction-to-ambient thermal resistance (θ_JA) of 114°C/W on a 4-layer JEDEC test board. This is higher than the TO-92 (232°C/W) but lower than SOIC-8 (180°C/W). Effective PCB copper pour under the package is essential to maintain T_J ≤ 125°C at full 100 mA load.

Can LM79L05ACTL/NOPB be used in adjustable configurations?

Yes, LM79L05ACTL/NOPB can be configured for adjustable output using external resistors, as shown in Figure 2 of the datasheet. The device supports boosted or adjustable negative outputs via a simple two-resistor network, though accuracy degrades beyond ±5% due to IQ variation. For dedicated adjustable regulation, TI recommends the LM137L series.

What protection features are integrated into LM79L05ACTL/NOPB?

LM79L05ACTL/NOPB integrates three protection mechanisms: (1) internal short-circuit current limiting independent of temperature, (2) safe operating area (SOA) circuitry limiting pass transistor power dissipation, and (3) thermal shutdown that disables output above +125°C junction temperature. These operate autonomously without external components.

Is LM79L05ACTL/NOPB pin-compatible with other LM79LXXAC variants?

No - LM79L05ACTL/NOPB (DSBGA-6) is not pin-compatible with LM79L05ACZ/NOPB (TO-92-3) or LM79L05ACM/NOPB (SOIC-8). Each package has distinct pin count, layout, and terminal mapping. Board redesign is required when substituting between packages, even though electrical specifications are identical across the LM79LXXAC family.