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Texas Instruments LM79L05ACTL
- Part No.:
- LM79L05ACTL
- Manufacturer:
- Texas Instruments
- Package:
- 6-WFBGA, DSBGA
- Datasheet:
-
LM79L05ACTL.pdf
- Description:
- IC REG LINEAR -5V 100MA 6DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,782
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Product details
Overview
LM79L05ACTL from Texas Instruments is a fixed-output, 3-terminal negative voltage regulator delivering −5 V at up to 100 mA, featuring ±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 - used in dual-rail analog power supplies and low-power industrial control circuits.
For engineers reviewing the LM79L05ACTL datasheet, LM79L05ACTL pinout, LM79L05ACTL application, or LM79L05ACTL equivalent, this page provides verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options for design continuity and supply chain resilience.
Technical Context
The LM79L05ACTL implements a monolithic bipolar linear regulator architecture with built-in safe operating area (SOA) limiting, temperature-independent short-circuit current limit, and thermal shutdown. It operates across 0°C to +70°C ambient and requires a minimum input voltage of −7.5 V to maintain regulation at full load.
Its DSBGA-6 (YZR) package enables compact PCB layout with low thermal resistance (θJA = 114°C/W on 4-layer JEDEC board), and its output stability is guaranteed with ≥0.1 μF ceramic or aluminum electrolytic capacitance - no external compensation required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −5.0 V nominal, ±5% tolerance (−4.75 V to −5.25 V) ensures compatibility with standard −5 V logic and analog circuitry. |
| Output Current | 100 mA maximum continuous - sufficient for biasing op-amps, sensors, and low-power analog subsystems. |
| Line Regulation | ≤0.07% ΔVOUT/V - maintains tight output under input variations from −7.5 V to −20 V. |
| Load Regulation | ≤0.01% ΔVOUT/mA - holds output within ±1 mV across 1–100 mA load range. |
| Quiescent Current | 2–6 mA typical - enables efficient operation in battery-backed or always-on monitoring systems. |
| Ripple Rejection | ≥50 dB at 120 Hz - suppresses AC ripple from unregulated DC sources in mixed-signal designs. |
| Input Voltage Range | −7.5 V to −20 V - defines minimum dropout and maximum safe input for reliable regulation. |
| Thermal Shutdown | Activates at TJ ≥ +125°C - prevents permanent damage during overload or poor heatsinking. |
Pinout & Package
LM79L05ACTL uses a 6-bump DSBGA (YZR) package measuring 1.09 mm × 1.88 mm × 0.76 mm, optimized for space-constrained applications and compatible with standard SMT reflow profiles (MSL Level-1, 260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Bump A1) | Ground (GND) | Reference node for output voltage; must be low-impedance connection to system ground plane. |
| Pin 2 (Bump A2) | Input (−VIN) | Negative input terminal; accepts unregulated −7.5 V to −20 V supply; requires local decoupling. |
| Pin 3 (Bump B1) | Output (−VOUT) | Regulated −5 V output; connects directly to load and 0.1 μF output capacitor. |
| Pin 4 (Bump B2) | No Connect (NC) | Internally unconnected bump; left floating per TI specification - no routing or solder mask opening required. |
| Pin 5 (Bump C1) | No Connect (NC) | Internally unconnected bump; electrically isolated - must not be tied to any net. |
| Pin 6 (Bump C2) | Ground (GND) | Second ground terminal; improves thermal conduction and reduces ground loop impedance when tied to same plane as Pin 1. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed −5 V output with ±5% accuracy | Eliminates external resistor networks and trimming, reducing BOM count and calibration effort in production. |
| Stable with 0.1 μF output capacitor | Enables use of small, low-ESR ceramic capacitors - saves board space and improves transient response vs. larger electrolytics. |
| Internal SOA, short-circuit, and thermal protection | Allows safe operation under fault conditions without external current-limiting components or foldback circuitry. |
| Low quiescent current (2–6 mA) | Minimizes standby power loss in always-on instrumentation and sensor nodes powered from limited-energy sources. |
| DSBGA-6 footprint | Reduces PCB area by >70% vs. TO-92 and >50% vs. SOIC-8, supporting ultra-compact portable and wearable electronics. |
Applications
| Industrial Sensor Signal Conditioning | Dual-Rail Analog Power Supply |
|---|---|
Use Scenario: Providing clean, stable −5 V rail for precision op-amps and ADC drivers in factory-floor temperature/pressure transmitters. IC Role / Device Role / Timing Role: Negative voltage source enabling bipolar signal swing and common-mode rejection in differential front-ends. Use Value: Maintains <±1 mV load regulation across 1–100 mA, ensuring measurement accuracy unaffected by varying sensor excitation current. | Use Scenario: Paired with LM78L05ACTL to generate symmetric ±5 V rails for audio codec ICs and analog multiplexers in medical diagnostic equipment. IC Role / Device Role / Timing Role: Dedicated negative regulator supplying isolated analog ground-referenced circuitry. Use Value: Delivers ≥50 dB ripple rejection at 120 Hz, preventing switching noise from digital sections from coupling into sensitive analog paths. |
| Low-Power IoT Node Biasing | Legacy TTL Logic Interface |
Use Scenario: Powering −5 V bias for RF front-end LNA stages and EEPROM write circuitry in battery-operated environmental monitors. IC Role / Device Role / Timing Role: Efficient negative supply generator with low quiescent current and fast transient recovery. Use Value: Draws only 2–6 mA quiescent current, extending battery life in multi-year deployments while maintaining regulation during burst-mode RF transmission. | Use Scenario: Restoring legacy −5 V logic levels for interface with vintage industrial PLC I/O modules and test equipment. IC Role / Device Role / Timing Role: Voltage translation and level restoration component for backward-compatible system integration. Use Value: Provides ±5% output accuracy and ≤0.01% load regulation - meets original TTL spec requirements for valid logic '0' thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM79L05ACZ/NOPB | TO-92 (LP) 3-pin through-hole package; higher θJA (232°C/W); same electrical specs and 0–70°C rating. | Requires through-hole assembly and larger PCB footprint; better suited for prototyping or high-reliability mechanical mounting. | Select when manual assembly, thermal mass, or mechanical robustness outweighs miniaturization needs. |
| LM79L05ACM/NOPB | SOIC-8 (D) surface-mount package; 8 pins with two NC pins; θJA = 180°C/W; identical regulation performance. | Offers greater layout flexibility and easier rework than DSBGA; compatible with standard pick-and-place and AOI inspection. | Select when production scalability, testability, or thermal margin above 114°C/W is prioritized over minimal size. |
Compared with LM79L05ACTL, the TO-92 variant offers mechanical ruggedness but sacrifices board density, while the SOIC-8 version trades some miniaturization for broader manufacturing compatibility and thermal headroom - all three share identical −5 V regulation, protection features, and 100 mA capability.
Availability
LM79L05ACTL is available at Aetrix Electronics and suitable for industrial sensor conditioning, dual-rail analog power supplies, low-power IoT node biasing, and legacy TTL logic interface applications requiring stable component supply and long-term sourcing continuity.
Supply support for LM79L05ACTL 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 decades of expertise in power management ICs and industrial-grade reliability.
The LM79LXXAC series was designed specifically for cost-sensitive, space-constrained applications needing robust, fixed-output negative regulation - targeting instrumentation, sensor interfaces, and legacy system upgrades where simplicity and proven performance are critical.
FAQ
What is the maximum input voltage for LM79L05ACTL?
The absolute maximum input voltage for LM79L05ACTL is −35 V, but the recommended operating range to maintain regulation is −7.5 V to −20 V. Exceeding −20 V increases power dissipation and junction temperature risk, especially at full 100 mA load. The LM79L05ACTL datasheet specifies −20 V as the upper limit for guaranteed line regulation performance.
Does LM79L05ACTL require an input capacitor?
While not strictly mandatory, a 0.33 μF ceramic input capacitor placed close to the LM79L05ACTL input pin is strongly recommended to suppress high-frequency noise and prevent oscillation due to trace inductance. The LM79L05ACTL output remains stable with only 0.1 μF, but input bypassing improves overall PSRR and transient immunity in noisy environments.
Can LM79L05ACTL be used in adjustable configurations?
Yes - the LM79L05ACTL can be configured as an adjustable negative regulator using external resistors, as shown in Figure 2 of the SNOSBR8K datasheet. However, doing so requires careful attention to reference current (IQ) injection and stability compensation; the fixed −5 V configuration remains the most robust and widely validated use case for LM79L05ACTL.
What is the thermal resistance (θJA) of LM79L05ACTL?
The LM79L05ACTL has a junction-to-ambient thermal resistance (θJA) of 114°C/W when mounted on a 4-layer JEDEC-standard test board (JESD 51-7). This value assumes proper PCB copper pour under the DSBGA thermal pad; actual θJA will increase significantly with reduced copper area or single-layer boards.
Is LM79L05ACTL RoHS compliant and lead-free?
Yes - LM79L05ACTL/NOPB.B is RoHS compliant and features a matte tin (SNAGCU) lead finish over copper. Its MSL rating is Level-1 (unlimited floor life at ≤30°C/60% RH), and it supports standard Pb-free reflow profiles up to 260°C peak temperature, as confirmed in TI's PACKAGE OPTION ADDENDUM.
LM79L05ACTL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Negative
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- -35V
- Voltage - Output (Min/Fixed):
- -5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 50dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DSBGA (1.5x1.3)
LM79L05ACTL FAQ
1.How can I place an order for LM79L05ACTL through Aetrix?
Please submit a Request for Quotation (RFQ) for LM79L05ACTL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM79L05ACTL reliable?
The price and inventory of LM79L05ACTL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM79L05ACTL is usually 5 days.
3.What payment methods are accepted for LM79L05ACTL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM79L05ACTL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM79L05ACTL?
LM79L05ACTL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM79L05ACTL order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM79L05ACTL?
For technical support, including LM79L05ACTL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM79L05ACTL requirements.
6.How does Aetrix verify that LM79L05ACTL is sourced from the original manufacturer or authorized distributors?
All LM79L05ACTL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM79L05ACTL meets industry standards.
7.What is the process for return or replacement of LM79L05ACTL?
All LM79L05ACTL units undergo pre-shipment inspection (PSI). If there is an issue with LM79L05ACTL, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM79L05ACTL part is unused and in its original packaging.
Return procedure for LM79L05ACTL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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