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Texas Instruments LM2940CS-9.0
- Part No.:
- LM2940CS-9.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
LM2940CS-9.0.pdf
- Description:
- IC REG LIN 9V 1A DDPAK/TO263-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,390
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Product details
Overview
LM2940CS-9.0 from Texas Instruments is a 1A low-dropout linear voltage regulator delivering a fixed 9.0V output with typical dropout voltage of 0.5V at full load, reverse battery protection, and internal short-circuit/thermal overload protection. It operates over 0°C to 125°C and is designed for automotive power rails, industrial control modules, and battery-powered systems requiring stable 9V supply under transient conditions.
For engineers reviewing the LM2940CS-9.0 datasheet, LM2940CS-9.0 pinout, LM2940CS-9.0 application, or LM2940CS-9.0 equivalent, key selection criteria include dropout performance at 1A, reverse polarity tolerance (−30V DC), thermal shutdown behavior, and minimum 22 μF output capacitor stability requirement.
Technical Context
The LM2940CS-9.0 uses a PNP pass transistor architecture enabling low dropout operation without external components. Its quiescent current reduction circuit lowers ground current to 30 mA when input-output differential exceeds ~3V, improving efficiency in non-dropout conditions.
It integrates mirror-image insertion protection, automatic shutdown during load-dump transients (>26V), and reverse-battery fault handling down to −30V DC. The device requires ≥22 μF output capacitance with controlled ESR to maintain loop stability across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 9.0V ±2.7% (8.73V–9.27V) over full temperature and load range - ensures compatibility with 9V logic and analog subsystems. |
| Dropout Voltage | 0.5V typical at 1A load - enables regulation from 9.5V input, critical for automotive cold-crank scenarios. |
| Max Input Voltage | 26V continuous - supports 24V nominal vehicle electrical systems with margin for transients. |
| Reverse Polarity | Withstands −30V DC input - protects against accidental battery reversal in vehicular installations. |
| Output Capacitor | Minimum 22 μF required - stabilizes feedback loop; ESR must stay within defined bounds to prevent oscillation. |
| Quiescent Current | 30 mA max at 1A load and 5V differential - reduces standby power loss in always-on modules. |
| Ripple Rejection | 64 dB min at 120 Hz - suppresses alternator ripple in automotive power supplies. |
Pinout & Package
LM2940CS-9.0 is housed in a 3-pin DDPAK/TO-263 (KTT) thermally enhanced surface-mount package with exposed thermal pad. Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output. Pins 2 and 7 are fused to center DAP per TI package drawing KTT0003B; Pin 5 and 6 require PCB tie-together per layout guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Input voltage terminal | Accepts unregulated DC input up to 26V; connects to bulk filter capacitor and upstream protection circuitry. |
| Pin 2 (GND) | Ground reference | Common return path for load current and internal bias; must be low-impedance connection to thermal pad and system ground plane. |
| Pin 3 (OUT) | Regulated output | Delivers stable 9.0V to load; requires ≥22 μF output capacitor placed adjacent to pin with controlled ESR. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse battery protection | Survives −30V DC input without damage - eliminates need for external series diode in automotive harnesses. |
| Load dump shutdown | Auto-shutdown during >26V transients (e.g., alternator load dump) - prevents internal overstress and downstream component failure. |
| Mirror-image insertion protection | Immune to incorrect orientation during manual assembly - avoids catastrophic failure if mounted backward on PCB. |
| Thermal and short-circuit protection | Self-limiting foldback current and thermal shutdown at 150°C - enables robust operation in enclosed enclosures without forced cooling. |
| Trimmed output voltage | ±2.7% initial accuracy (8.73V–9.27V) - reduces need for post-regulation trimming in cost-sensitive 9V applications. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Supplies 9V rail to microcontroller, CAN transceiver, and sensor interface circuitry in door module or lighting controller. IC Role / Device Role / Timing Role: Primary 9V LDO regulator providing clean, protected power independent of battery voltage fluctuations. Use Value: Reverse polarity and load dump immunity eliminate field failures from service errors or alternator faults. | Use Scenario: Powers isolated analog input channels and digital logic in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 24V DC bus to stable 9V for signal conditioning ICs. Use Value: 0.5V dropout enables reliable operation during brownout events where 24V bus dips to 12V. |
| Portable Test Equipment | Marine Navigation Display |
Use Scenario: Provides regulated 9V to precision ADC front-end and op-amp signal chain in handheld multimeter. IC Role / Device Role / Timing Role: Low-noise linear regulator minimizing power supply contribution to measurement error. Use Value: 270 μVrms output noise and 64 dB ripple rejection preserve dynamic range in 16-bit data acquisition. | Use Scenario: Powers GPS receiver, display backlight driver, and RF front-end in marine chartplotter operating from 12V lead-acid battery. IC Role / Device Role / Timing Role: Protected 9V source tolerant of saltwater environment-induced polarity reversals and cranking transients. Use Value: −30V reverse voltage rating and −75V transient tolerance prevent field returns due to improper battery jump-starts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2940CT-9.0/NOPB | TO-220 through-hole package; same electrical specs; higher θJA (60°C/W vs 80°C/W for KTT). | Suitable for prototyping or low-volume assemblies where manual soldering is preferred. | Select when board-level reworkability or heatsink mounting is prioritized over space-constrained SMT layouts. |
| TLV76790QWDRVRQ1 | Automotive-grade 1A LDO; lower quiescent current (25 μA vs 30 mA); tighter output tolerance (±1%); no reverse polarity protection. | Requires external reverse-protection diode; better for ultra-low-power always-on nodes. | Choose for new automotive designs needing AEC-Q100 qualification and lower IQ, but add external protection for reverse-battery resilience. |
Compared with LM2940CT-9.0/NOPB, the LM2940CS-9.0 offers superior thermal performance in high-density layouts via its DDPAK thermal pad; versus TLV76790QWDRVRQ1, it trades higher quiescent current for integrated reverse-battery and load-dump hardening-critical for legacy automotive harness environments.
Availability
LM2940CS-9.0 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power distribution, and marine navigation systems requiring stable component supply with long-term lifecycle support.
Supply support for LM2940CS-9.0 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 and embedded processing technologies with broad automotive, industrial, and personal electronics portfolios.
The LM2940-N/LM2940C product line was engineered specifically for vehicular power systems, emphasizing reverse-battery resilience, load-dump survival, and wide-temperature operation without external protection components.
FAQ
What is the maximum input voltage rating for LM2940CS-9.0?
The LM2940CS-9.0 has an absolute maximum input voltage rating of 26V under continuous operation. Exceeding this value-even briefly-may cause permanent damage. During load-dump transients, the device automatically shuts down to protect itself and the load, but sustained input above 26V is outside specification and not supported. Always verify upstream clamping or TVS protection when interfacing with 24V vehicle systems.
Does LM2940CS-9.0 require an input capacitor?
The LM2940CS-9.0 does not mandate an input capacitor for basic stability, but TI strongly recommends a 10 μF–100 μF low-ESR aluminum or tantalum capacitor placed near the IN pin to suppress high-frequency noise and improve transient response. This is especially critical in automotive environments with alternator ripple and switching noise. Without it, line transient immunity may degrade, increasing risk of output disturbance during ignition events.
Can LM2940CS-9.0 be used in place of LM2940CT-9.0/NOPB?
Yes, the LM2940CS-9.0 is functionally identical to LM2940CT-9.0/NOPB in electrical performance, including 9.0V output, 1A current capability, and protection features. However, the CS variant uses a DDPAK/TO-263 surface-mount package versus TO-220 through-hole, requiring PCB redesign. Thermal resistance differs (θJA = 80°C/W vs 60°C/W), so heatsinking strategy must be re-evaluated for equivalent power dissipation.
What output capacitor is required for stable operation of LM2940CS-9.0?
The LM2940CS-9.0 requires a minimum 22 μF output capacitor with ESR between 0.1 Ω and 10 Ω (depending on load current) to ensure closed-loop stability. Solid tantalum or low-ESR aluminum electrolytic capacitors are recommended. Ceramic capacitors alone are insufficient due to excessively low ESR; if used, they must be paralleled with a resistor or polymer capacitor to meet ESR requirements per Figure 35 in the datasheet.
Is LM2940CS-9.0 qualified for automotive applications?
The LM2940CS-9.0 is rated for 0°C to 125°C operating junction temperature and features reverse-battery protection, load-dump shutdown, and mirror-image insertion immunity-key requirements for automotive under-hood and body electronics. While not AEC-Q200 certified as a standalone component, it is widely deployed in automotive modules meeting ISO 16750-2 and ISO 7637-2 standards when properly applied with recommended external components.
LM2940CS-9.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.8V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- 15 mA
- PSRR:
- 64dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-3)
LM2940CS-9.0 FAQ
1.How can I place an order for LM2940CS-9.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2940CS-9.0 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 LM2940CS-9.0 reliable?
The price and inventory of LM2940CS-9.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2940CS-9.0 is usually 5 days.
3.What payment methods are accepted for LM2940CS-9.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2940CS-9.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2940CS-9.0?
LM2940CS-9.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2940CS-9.0 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 LM2940CS-9.0?
For technical support, including LM2940CS-9.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2940CS-9.0 requirements.
6.How does Aetrix verify that LM2940CS-9.0 is sourced from the original manufacturer or authorized distributors?
All LM2940CS-9.0 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 LM2940CS-9.0 meets industry standards.
7.What is the process for return or replacement of LM2940CS-9.0?
All LM2940CS-9.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2940CS-9.0, 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 LM2940CS-9.0 part is unused and in its original packaging.
Return procedure for LM2940CS-9.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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