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Texas Instruments LM140K-15/NOPB
- Part No.:
- LM140K-15/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-204AA, TO-3
- Datasheet:
-
LM140K-15/NOPB.pdf
- Description:
- IC REG LINEAR 15V 1A TO3-2
- Quantity:
- Payment:
- Shipping:
Inventory:1,995
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Product details
Overview
LM140K-15/NOPB from Texas Instruments is a fixed-output, 3-terminal positive voltage regulator delivering 15 V ±4% at 25°C with 1 A continuous output current, internal thermal shutdown, short-circuit current limiting, and safe-area protection in a TO-3 metal can package. It serves as a rugged local regulator for industrial power supplies, test equipment, and analog instrumentation requiring stable DC bias under variable load and line conditions.
For engineers reviewing the LM140K-15/NOPB datasheet, LM140K-15/NOPB pinout, LM140K-15/NOPB application, or LM140K-15/NOPB equivalent, key selection criteria include dropout voltage (2.0 V at 1 A), load regulation (≤35 mV over 5 mA–1 A), ripple rejection (≥60 dB at 120 Hz), quiescent current (6 mA typical), and TO-3 thermal performance (θJA = 39°C/W).
Technical Context
The LM140K-15/NOPB implements a monolithic series-pass regulator architecture with PNP pass transistor, internal bandgap reference, and error amplifier. Its safe-area compensation prevents second breakdown during overload, while thermal shutdown activates at junction temperatures exceeding 150°C.
It operates across −55°C to +125°C ambient temperature and requires minimum input voltage of 17.5 V to maintain regulation. Input bypassing is mandatory only when located >2 inches from bulk filter capacitor; output bypassing (0.1 μF ceramic) improves transient response but is not required for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 15 V ±4% at TJ = 25°C - ensures precise bias for op-amp rails and sensor excitation circuits |
| Output Current | 1 A continuous - supports medium-power analog subsystems without external boost transistors |
| Dropout Voltage | 2.0 V at IO = 1 A - enables operation from 19.5 V input in 24 V systems with margin |
| Ripple Rejection | ≥60 dB at 120 Hz - suppresses rectified AC noise in linear power supply front-ends |
| Load Regulation | ≤35 mV (5 mA to 1 A) - maintains voltage accuracy across dynamic loads like relay drivers |
| Quiescent Current | 6 mA typical - minimizes standby power loss in always-on instrumentation |
| Thermal Shutdown | Activates at TJ ≥ 150°C - protects against sustained overload or inadequate heatsinking |
Pinout & Package
LM140K-15/NOPB uses the TO-3 (NDS) metal-can package: two-terminal configuration with Input (collector) and Output (emitter) pins; case serves as Ground (base) terminal. Mounting tab is electrically connected to ground and must be isolated from chassis unless chassis is grounded.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Input (Pin 1) | Unregulated DC input | Connects to filtered rectifier output; must exceed 17.5 V for regulation |
| Output (Pin 2) | Regulated 15 V output | Supplies load; bypass with 0.1 μF ceramic near pin for transient immunity |
| Case (Ground) | Reference and thermal path | Electrically tied to circuit ground; provides primary heat conduction path to heatsink |
Key Features
| Feature | Design Value |
|---|---|
| Internal Safe-Area Protection | Prevents second breakdown during short-circuit or high-VCE overload, enabling robust operation without external foldback |
| Thermal Overload Shutdown | Self-resetting protection that disables output above 150°C junction temperature, preventing permanent damage |
| Short-Circuit Current Limit | Clamps peak output current to 1.2 A (typical), allowing indefinite fault survival with adequate heatsinking |
| P+ Product Enhancement Tested | Validated for enhanced reliability in extended temperature and long-life applications per TI's P+ screening flow |
Applications
| Industrial Power Supplies | Test & Measurement Equipment |
|---|---|
Use Scenario: Local regulation for ±15 V op-amp rails in bench power supplies and signal generators. IC Role / Device Role / Timing Role: Fixed 15 V positive rail generator with low noise and high PSRR. Use Value: Delivers 15 V ±0.6 V over full temperature and load range, eliminating need for post-regulation trimming. | Use Scenario: Bias supply for precision ADC reference buffers and analog front-ends in multimeters. IC Role / Device Role / Timing Role: Low-drift, low-noise DC source for sensitive analog circuitry. Use Value: 40 μV RMS output noise (10 Hz–100 kHz) preserves measurement resolution in 6½-digit instruments. |
| Embedded Control Systems | Analog Instrumentation |
Use Scenario: Regulated 15 V for PLC I/O module logic and isolation drivers. IC Role / Device Role / Timing Role: Rugged local regulator tolerant of industrial transients and wide ambient swings. Use Value: Operates from −55°C to +125°C ambient and withstands 35 V DC input surges per absolute max rating. | Use Scenario: Stable excitation voltage for strain gauge bridges and RTD interfaces in process transmitters. IC Role / Device Role / Timing Role: Precision voltage source with <±0.6 mV/°C TC and minimal load-induced drift. Use Value: Average TC of −1.8 mV/°C ensures bridge offset drift remains below 0.01% FS over 0–70°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM340K-15/NOPB | Same TO-3 package, identical pinout, but rated for −40°C to +125°C (vs. −55°C to +125°C); lower IQ (4.5 mA typ) | Suitable for commercial/industrial use where extended low-temp operation is unnecessary | Select for cost-sensitive designs needing same footprint and thermal performance without military-grade temp range |
| LM7815K | TO-3 package, same 15 V output, but no P+ enhancement testing; higher dropout (2.5 V) and lower ripple rejection (55 dB) | Acceptable for non-critical analog rails where tighter regulation and noise specs are not required | Choose when legacy compatibility or broader distributor availability outweighs enhanced reliability and PSRR |
Compared with LM140K-15/NOPB, LM340K-15/NOPB offers lower quiescent current and simplified qualification, while LM7815K trades off PSRR and safe-area protection for wider legacy support-making LM140K-15/NOPB optimal for high-reliability analog systems demanding tight regulation and robust fault tolerance.
Availability
LM140K-15/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, test equipment, embedded control systems, and analog instrumentation requiring stable component supply with long-term lifecycle assurance.
Supply support for LM140K-15/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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal technologies for industrial, automotive, and communications markets.
The LM140K series was designed as a high-reliability, metal-can linear regulator family for mission-critical analog power rails where thermal robustness, safe-area operation, and extended temperature range are essential.
FAQ
What is the maximum input voltage for LM140K-15/NOPB?
The absolute maximum DC input voltage for LM140K-15/NOPB is 35 V, as specified in the Absolute Maximum Ratings table. For reliable operation within electrical specifications, input voltage must remain between 17.5 V (minimum for regulation) and ≤30 V (per VMIN–VMAX limits in Electrical Characteristics). Exceeding 35 V risks permanent damage even with brief transients.
Does LM140K-15/NOPB require an output capacitor for stability?
No, LM140K-15/NOPB does not require an output capacitor for stability-it is unconditionally stable per the datasheet. However, a 0.1 μF ceramic capacitor placed directly at the output pin significantly improves transient response during load steps. This capacitor is recommended but optional for basic regulation functionality.
What thermal considerations apply to LM140K-15/NOPB in TO-3 package?
LM140K-15/NOPB in TO-3 has θJA = 39°C/W without heatsink. With a typical 4°C/W heatsink, total θJA drops to ~43°C/W. At 1 A output and 20 V input (5 V dropout), power dissipation is 5 W-raising junction temperature by ~215°C above ambient without heatsink. Thus, a heatsink is mandatory for continuous 1 A operation at ambient >25°C.
Can LM140K-15/NOPB be used in adjustable configurations?
Yes, LM140K-15/NOPB can be configured as an adjustable regulator using external resistors per Figure 2 in the datasheet, though its internal feedback is optimized for fixed 15 V. The equation VOUT = 15 V + (15 V/R1 + IQ)R2 applies, with IQ ≈ 6 mA. Performance (line/load regulation, noise) may degrade versus fixed-mode operation.
Is LM140K-15/NOPB RoHS compliant?
Yes, LM140K-15/NOPB is RoHS compliant, as confirmed in TI's Packaging Information Addendum: "RoHS: Yes" for orderable part number LM140K-15/NOPB. The /NOPB suffix explicitly denotes lead-free finish, meeting EU Directive 2011/65/EU requirements.
LM140K-15/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-204AA, TO-3
- Packaging:
- Tray
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 15V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-3-2
LM140K-15/NOPB FAQ
1.How can I place an order for LM140K-15/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM140K-15/NOPB 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 LM140K-15/NOPB reliable?
The price and inventory of LM140K-15/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM140K-15/NOPB is usually 5 days.
3.What payment methods are accepted for LM140K-15/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM140K-15/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM140K-15/NOPB?
LM140K-15/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM140K-15/NOPB 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 LM140K-15/NOPB?
For technical support, including LM140K-15/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM140K-15/NOPB requirements.
6.How does Aetrix verify that LM140K-15/NOPB is sourced from the original manufacturer or authorized distributors?
All LM140K-15/NOPB 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 LM140K-15/NOPB meets industry standards.
7.What is the process for return or replacement of LM140K-15/NOPB?
All LM140K-15/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM140K-15/NOPB, 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 LM140K-15/NOPB part is unused and in its original packaging.
Return procedure for LM140K-15/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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