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Texas Instruments LM2941T/LF08
- Part No.:
- LM2941T/LF08
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2941T/LF08.pdf
- Description:
- IC REG LINEAR POS ADJ 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,238
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Product details
Overview
LM2941T/LF08 from Texas Instruments is a 1-A adjustable low-dropout linear regulator with 0.5 V typical dropout at full load, operating from 6 V to 26 V input and delivering 5 V to 20 V output via external resistor divider. It features reverse-battery protection, TTL/CMOS-compatible ON/OFF control, and thermal shutdown-designed for automotive power rails and industrial 12 V/24 V systems requiring stable mid-rail voltage.
For engineers reviewing the LM2941T/LF08 datasheet, LM2941T/LF08 pinout, LM2941T/LF08 application, or LM2941T/LF08 equivalent, key selection considerations include its 1 A continuous output capability, 30 mA quiescent current at 1 A load and 5 V VIN–VOUT differential, adjustable output range, reverse-polarity tolerance down to −30 V DC, and TO-220 (5-pin) package with exposed tab for thermal management.
Technical Context
The LM2941T/LF08 uses a PNP pass transistor architecture enabling low dropout and inherent reverse-battery protection without external diodes. Its internal bandgap reference (1.275 V typical) sets output voltage via ADJ pin feedback, while an ON/OFF pin with 0.8 V turn-on and 2 V turn-off thresholds enables active enable/disable control.
Quiescent current drops to 30 mA under normal regulation (VIN − VOUT ≥ 3 V) due to ground-current reduction circuitry, rising only in dropout mode (VIN − VOUT ≤ 3 V). Overvoltage shutdown activates above ~30 V input, and short-circuit current limit holds peak output at 1.6–1.9 A before thermal shutdown intervenes at ~155 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous - supports high-current analog/digital loads without external boost stages |
| Dropout Voltage | 0.5 V typical at 1 A - enables operation with minimal headroom, e.g., 12 V input → 11.5 V output |
| Input Voltage Range | 6 V to 26 V - compatible with 12 V and 24 V automotive and industrial bus systems |
| Output Voltage Range | 5 V to 20 V adjustable - set precisely using R1/R2 divider; reference voltage = 1.275 V |
| Quiescent Current | 30 mA at 1 A load and 5 V VIN−VOUT - reduces system standby power vs. fixed-LDO alternatives |
| Reverse Polarity Tolerance | −30 V DC - protects against battery misconnection in vehicle installations |
| Thermal Shutdown | ~155 °C junction - prevents permanent damage during overload or poor heatsinking |
Pinout & Package
LM2941T/LF08 is supplied in a TO-220 (5-pin) plastic package with exposed metal tab thermally and electrically connected to GND (Pin 3). The tab must be soldered to a large copper pour or heatsink for reliable 1 A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 4) | Input supply connection | Accepts 6–26 V unregulated input; requires ≥470 nF ceramic bypass capacitor close to pin |
| OUT (Pin 5) | Regulated output | Delivers 5–20 V adjustable output; requires ≥22 µF output capacitor with 100 mΩ–1 Ω ESR for stability |
| GND (Pin 3) | Power ground reference | Common return for IN, OUT, ADJ, and ON/OFF; tied to exposed tab for thermal conduction |
| ADJ (Pin 1) | Voltage feedback node | Sets output via resistor divider (R1/R2); bias current <100 nA - use R1 = 1 kΩ for minimal error |
| ON/OFF (Pin 2) | Enable/disable control | Active-low logic interface: <0.8 V = ON, >2 V = OFF; no internal pullup - must be externally terminated |
Key Features
| Feature | Design Value |
|---|---|
| Reverse-battery protection | Withstands −30 V DC input without damage - eliminates need for external series diode in automotive designs |
| Low-quiescent-current mode | 30 mA ground current at 1 A load and 5 V VIN−VOUT - extends battery life in always-on systems |
| Adjustable output with precision reference | 1.275 V ±3% internal reference enables 5–20 V outputs with <1% setting error using 0.1% resistors |
| Overvoltage shutdown | Disables output above ~30 V input - protects downstream circuitry during load-dump transients |
| Mirror-image insertion protection | Prevents damage if installed backward on PCB - critical for field-replaceable modules in harsh environments |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Regulating 12 V battery to 12 V or 15 V for microcontroller, CAN transceiver, and sensor interface rails in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary mid-rail LDO supplying 1 A to mixed-signal subsystems with reverse-battery and load-dump resilience. Use Value: Eliminates external reverse-protection diode and enables direct battery tie-in, reducing BOM count and thermal loss by ~0.4 W vs. diode+fixed-LDO solutions. | Use Scenario: Providing stable 5 V or 12 V to isolated digital I/O channels in programmable logic controller backplanes operating from 24 V DC field supply. IC Role / Device Role / Timing Role: Adjustable post-regulator delivering clean, low-noise power to optocoupler drivers and level-shifters. Use Value: Adjustable output allows single BOM variant to support multiple I/O voltage standards (5 V/12 V/15 V), simplifying inventory and design reuse. |
| Off-Highway Vehicle Telematics | Marine Navigation System Power |
Use Scenario: Powering GPS/GNSS receivers, cellular modems, and display controllers in construction equipment where input swings from 9 V cranking to 30 V alternator surge. IC Role / Device Role / Timing Role: Input-tolerant LDO with OVSD and thermal foldback, managing wide-input transients while maintaining regulated output. Use Value: Survives 30 V load-dump events without latch-up or reset, avoiding brownouts that disrupt GNSS lock or modem handshakes. | Use Scenario: Supplying 12 V to radar processors and chartplotter displays aboard vessels subject to salt-corrosion and battery polarity reversal during maintenance. IC Role / Device Role / Timing Role: Reverse-polarity-hardened regulator ensuring continuous operation even after accidental negative battery connection. Use Value: −30 V DC reverse tolerance prevents field failures and warranty claims caused by marine technician errors during battery replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2941CT | Same electrical specs but 0°C to +125°C operating range (vs. −40°C to +125°C for LM2941T) | Not rated for extended cold-start automotive environments below 0°C | Select LM2941CT only for commercial-temperature industrial controls where ambient stays >0°C |
| LT1129CS8-5 | Fixed 5 V output, 700 mA max, 0.6 V dropout, no ON/OFF or reverse-battery protection | Lacks adjustability, lower current, and missing automotive-grade fault protections | Choose only for space-constrained 5 V-only applications where reverse protection is handled externally |
Compared with LM2941CT, LM2941T/LF08 offers wider temperature qualification for under-hood use; compared with LT1129CS8-5, it provides higher current, full adjustability, and integrated reverse/overvoltage protection-making it uniquely suited for ruggedized 12 V/24 V systems demanding reliability over spec sheet parity.
Availability
LM2941T/LF08 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and marine navigation systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM2941T/LF08 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 delivering analog, embedded processing, and connectivity technologies for industrial, automotive, and personal electronics markets.
The LM2941 product line was developed specifically for automotive and industrial power management applications requiring robustness against reverse battery, load dump, and thermal stress-emphasizing fault tolerance over cost-optimized consumer-grade regulation.
FAQ
What is the maximum input voltage the LM2941T/LF08 can withstand without damage?
The LM2941T/LF08 has an absolute maximum survival input voltage of 60 V for ≤100 ms, but its recommended maximum operational input voltage is 26 V DC. Sustained operation above 26 V risks performance degradation and may trigger overvoltage shutdown at ~30 V. For reliable long-term function, keep VIN ≤26 V and ensure transient clamping for load-dump events exceeding this threshold. The LM2941T/LF08's internal OVSD circuit disables output above ~30 V to protect itself and downstream circuitry.
Can the LM2941T/LF08 be used to generate a 3.3 V output?
No, the LM2941T/LF08 is not specified to deliver 3.3 V output. Its minimum guaranteed output voltage is 5 V, as confirmed by the datasheet's "Output Voltage Adjustable From 5 V to 20 V" specification and electrical characteristics tables. Attempting to set VOUT below 5 V violates the device's design envelope and results in unstable regulation or failure to maintain regulation across temperature and load. For 3.3 V applications, select a dedicated low-voltage LDO such as the TLV73333.
How should the ON/OFF pin of the LM2941T/LF08 be configured for always-on operation?
For always-on operation, connect the ON/OFF pin (Pin 2) directly to GND (Pin 3). This ensures the pin voltage remains below the 0.8 V turn-on threshold across all conditions. Do not leave the pin floating, as noise or leakage could cause erratic enable/disable behavior. If interfacing with a microcontroller GPIO, drive the pin actively low (0 V) to enable and high-impedance or pulled high (>2 V) to disable - but for fixed-on use, a direct GND tie is simplest and most robust. This configuration applies to every LM2941T/LF08 unit deployed in the system.
What output capacitor is required for stable operation of the LM2941T/LF08?
The LM2941T/LF08 requires a minimum 22 µF output capacitor with ESR between 100 mΩ and 1 Ω for loop stability. A tantalum capacitor meeting these specs is preferred; alternatively, a 22 µF X5R/X7R ceramic capacitor may be used only if a 0.1–1 Ω series resistor is added to emulate the required ESR. The capacitor must be placed within 1 cm of the OUT and GND pins, with low-inductance ground routing. Using undersized or low-ESR ceramic-only capacitors causes oscillation and regulation failure. This requirement is mandatory for every LM2941T/LF08 implementation.
Does the LM2941T/LF08 support parallel operation for higher current?
No, the LM2941T/LF08 is not designed for parallel operation. Its architecture lacks current-sharing circuitry or master/slave control, and connecting outputs in parallel risks thermal runaway due to mismatched dropout voltages and load distribution. TI does not characterize or recommend paralleling LM2941T/LF08 devices. For >1 A requirements, use a single higher-current regulator (e.g., LM3940) or redesign the power stage - never parallel LM2941T/LF08 units. Each LM2941T/LF08 must operate independently per its datasheet limits.
LM2941T/LF08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- 20V
- Voltage Dropout (Max):
- 1V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- 15 mA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2941T/LF08 FAQ
1.How can I place an order for LM2941T/LF08 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2941T/LF08 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 LM2941T/LF08 reliable?
The price and inventory of LM2941T/LF08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2941T/LF08 is usually 5 days.
3.What payment methods are accepted for LM2941T/LF08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2941T/LF08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2941T/LF08?
LM2941T/LF08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2941T/LF08 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 LM2941T/LF08?
For technical support, including LM2941T/LF08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2941T/LF08 requirements.
6.How does Aetrix verify that LM2941T/LF08 is sourced from the original manufacturer or authorized distributors?
All LM2941T/LF08 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 LM2941T/LF08 meets industry standards.
7.What is the process for return or replacement of LM2941T/LF08?
All LM2941T/LF08 units undergo pre-shipment inspection (PSI). If there is an issue with LM2941T/LF08, 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 LM2941T/LF08 part is unused and in its original packaging.
Return procedure for LM2941T/LF08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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