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LM2990T-12
Texas Instruments
IC REG LINEAR -12V 1.8A TO220-3
5666 Pcs New Original In Stock
Linear Voltage Regulator IC Negative Fixed 1 Output 1.8A TO-220-3
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5.0 / 5.0
- (131 Ratings)
LM2990T-12
Product Overview
1476834
DiGi Electronics Part Number
LM2990T-12-DGManufacturer
Texas Instruments
LM2990T-12
Description
IC REG LINEAR -12V 1.8A TO220-3Inventory
5666 Pcs New Original In Stock
Linear Voltage Regulator IC Negative Fixed 1 Output 1.8A TO-220-3
Quantity
Minimum 1
Minimum 1
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LM2990T-12 Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
Packaging
-
Series
-
Product Status
Last Time Buy
Output Configuration
Negative
Output Type
Fixed
Number of Regulators
1
Voltage - Input (Max)
-26V
Voltage - Output (Min/Fixed)
-12V
Voltage - Output (Max)
-
Voltage Dropout (Max)
1V @ 1A
Current - Output
1.8A
Current - Quiescent (Iq)
1 mA
Current - Supply (Max)
5 mA
PSRR
52dB (1kHz)
Control Features
-
Protection Features
Over Temperature, Short Circuit
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-220-3
Supplier Device Package
TO-220-3
Base Product Number
LM2990
Datasheet & Documents
Manufacturer Product Page
LM2990T-12 Specifications
HTML Datasheet
LM2990T-12-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
2166-LM2990T-12-296
Standard Package
45
Alternative Parts
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QUANTITY AVAILABLE
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UNIT PRICE
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Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
DiGi Electronics的快速發貨和優質售後服務讓我非常滿意。
de desembre 02, 2025
価格が競争力があるため、安心して購入できます。コストパフォーマンス最高です！
de desembre 02, 2025
Speedy shipping and tough build quality make DiGi Electronics a reliable choice for professional use.
de desembre 02, 2025
The overall packaging quality contributed significantly to my positive shopping experience.
de desembre 02, 2025
Their delivery process is seamless and impressively fast.
de desembre 02, 2025
Their after-sales team provides quick solutions and helpful guidance.
de desembre 02, 2025
The logistics process is streamlined, offering peace of mind.
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Frequently Asked Questions (FAQ)
Can the LM2990T-12 replace the older 7912 linear regulator in my negative rail design without requiring circuit modifications?
Yes, the LM2990T-12 is a direct functional upgrade to the 7912 and can typically replace it without circuit changes due to its similar pinout and -12V fixed output. However, unlike the 7912, the LM2990T-12 has a lower dropout voltage (1V max at 1A vs. ~2V for the 7912), which improves efficiency in low-headroom applications. Ensure your input voltage stays above -13V under full load to maintain regulation. Also verify thermal performance—the LM2990T-12 can deliver up to 1.8A, so heatsinking may be necessary depending on your input-output differential and ambient temperature.
What are the critical thermal design considerations when using the LM2990T-12 at full 1.8A load in an enclosed industrial environment?
At 1.8A output, the LM2990T-12 can dissipate significant power—e.g., over 10W with a -20V input—requiring careful thermal management. In an enclosed industrial setting with ambient temperatures approaching 50°C, you must use a properly sized heatsink to keep the junction temperature below 125°C. Calculate required thermal resistance using θJA = (Tj_max - Ta) / Pd, and account for the TO-220 package’s θJC of ~3°C/W. Without adequate heatsinking, thermal shutdown may trigger intermittently, causing system instability. Consider forced airflow or metal-core PCBs if space constraints limit heatsink size.
Is the LM2990T-12 a suitable drop-in replacement for the ON Semiconductor MC7912BT in a legacy power supply, and what risks should I evaluate?
The LM2990T-12 can serve as a replacement for the MC7912BT in many cases due to matching pinout and -12V output, but key differences exist: the LM2990T-12 supports higher output current (1.8A vs. 1A) and has better PSRR (52dB vs. ~40dB at 1kHz), improving noise rejection. However, verify that your input capacitor ESR and layout meet TI’s recommendations—unstable operation can occur if bypassing is inadequate. Also, note that the LM2990T-12 is in Last Time Buy status; plan for long-term sourcing or qualify an alternate like the LM2990T-12/NOPB to avoid future supply chain disruptions.
How does the dropout performance of the LM2990T-12 compare to modern LDOs like the TPS7A3001, and when might it still be the right choice despite being older technology?
The LM2990T-12 has a relatively high dropout voltage (1V at 1A), making it far less efficient than modern LDOs like the TPS7A3001 (which achieves ~350mV dropout). However, the LM2990T-12 remains viable in high-current, negative-rail applications where ultra-low dropout isn’t critical but robustness and simplicity are. It includes built-in short-circuit and over-temperature protection, and its through-hole TO-220 package simplifies prototyping and repair. Use it when input voltages are sufficiently negative (e.g., ≥ -14V) and when replacing legacy designs where redesigning for SMD LDOs isn’t cost-effective.
What failure modes should I anticipate if I operate the LM2990T-12 near its maximum input voltage of -26V in a high-vibration automotive application?
Operating the LM2990T-12 near -26V increases stress on internal components and raises the risk of premature failure, especially in high-vibration environments typical of automotive systems. Prolonged exposure to maximum input voltage can accelerate oxide degradation and reduce long-term reliability. Additionally, mechanical stress from vibration may fatigue the TO-220 leads or solder joints if not properly secured. Mitigate this by derating the input voltage (e.g., stay below -24V), using strain relief on wiring, and applying conformal coating. Also ensure input transient protection (e.g., TVS diodes) is in place, as load dumps or inductive spikes could exceed absolute maximum ratings even briefly.
Quality Assurance (QC)
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LM2990T-12 CAD Models
Texas Instruments LM2990T-12 PCB symbols & footprints
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