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LM3490IM5-12
Texas Instruments
IC REG LINEAR 12V 100MA SOT23-5
1000269 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 100mA SOT-23-5
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5.0 / 5.0
- (278 Ratings)
LM3490IM5-12
Product Overview
1326200
DiGi Electronics Part Number
LM3490IM5-12-DGManufacturer
Texas Instruments
LM3490IM5-12
Description
IC REG LINEAR 12V 100MA SOT23-5Inventory
1000269 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 100mA SOT-23-5
Quantity
Minimum 1
Minimum 1
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LM3490IM5-12 Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
Packaging
-
Series
-
Product Status
Obsolete
Output Configuration
Positive
Output Type
Fixed
Number of Regulators
1
Voltage - Input (Max)
30V
Voltage - Output (Min/Fixed)
12V
Voltage - Output (Max)
-
Voltage Dropout (Max)
1.2V @ 100mA
Current - Output
100mA
Current - Quiescent (Iq)
4 mA
PSRR
-
Control Features
Enable
Protection Features
Short Circuit
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
SC-74A, SOT-753
Supplier Device Package
SOT-23-5
Base Product Number
LM3490
Datasheet & Documents
HTML Datasheet
LM3490IM5-12-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LM3490IM5-12DKR
TEXTISLM3490IM5-12
LM3490IM512
2156-LM3490IM5-12
LM3490IM5-12CT
LM3490IM5-12TR
2156-LM3490IM5-12-TITR-DG
Standard Package
1,000
Alternative Parts
View DetailsPART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
Excellent packaging that kept everything secure, preventing any damage.
de desembre 02, 2025
Customer support is excellent; they handle my inquiries with care and professionalism.
de desembre 02, 2025
Consistent, complete packaging shows their commitment to quality.
de desembre 02, 2025
DiGi Electronics' technical team has a deep understanding of their offerings, which reflects in their expert guidance.
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Frequently Asked Questions (FAQ)
Can the LM3490IM5-12 be safely replaced with the LM3480IM3X-12/NOPB in a legacy 24V industrial sensor design, and what are the key risks to evaluate during drop-in substitution?
While the LM3480IM3X-12/NOPB is listed as a substitute for the LM3490IM5-12, careful evaluation is required before substitution due to subtle but critical differences. The LM3490IM5-12 supports up to 30V input and has a 1.2V dropout at 100mA, whereas the LM3480IM3X-12/NOPB has a lower maximum input voltage of 26V and slightly different enable logic thresholds. In a 24V system operating near the upper rail, transient spikes could push the LM3480 beyond its absolute maximum rating, risking premature failure. Additionally, the LM3480’s quiescent current (typically 2.5mA) is lower, which may affect power budgeting in always-on applications. Always verify input transient protection, thermal performance under load, and enable pin compatibility before committing to the swap—especially since the LM3490IM5-12 is now obsolete and long-term sourcing depends on reliable alternatives.
What are the hidden thermal risks when using the LM3490IM5-12 in a sealed enclosure with ambient temperatures approaching 85°C, and how can I mitigate junction overheating without a heatsink?
The LM3490IM5-12 in SOT-23-5 package has limited thermal dissipation capability (θJA ≈ 200–250°C/W), making it prone to thermal shutdown or accelerated aging when dissipating more than ~50mW in high-ambient environments. At 85°C ambient with a 24V input and 100mA load, power dissipation reaches 1.2W (P = (24V – 12V) × 0.1A), pushing the junction temperature well beyond the 125°C limit. To mitigate this, reduce input voltage via pre-regulation (e.g., a buck converter), derate output current below 60mA, or increase PCB copper area under the device (thermal pad connection to ground plane). Avoid relying solely on natural convection in sealed enclosures—consider adding venting or relocating the regulator to a cooler zone. Thermal modeling or empirical testing under worst-case conditions is strongly recommended.
Is it safe to operate the LM3490IM5-12 continuously at 100mA output current with a 30V input in an automotive environment, given its dropout voltage and lack of overtemperature shutdown?
Operating the LM3490IM5-12 at its absolute maximum input voltage (30V) while delivering full 100mA load presents significant reliability risks, especially in automotive environments where load dumps can exceed 40V. Although the part is rated for 30V continuous, real-world transients (e.g., ISO 7637-2 pulses) can cause voltage overshoots that damage the internal pass element. Furthermore, the device lacks integrated thermal shutdown—meaning sustained high power dissipation ((30V–12V)×0.1A = 1.8W) will cause junction temperatures to rise uncontrollably, leading to thermal runaway or latent failure. For automotive use, add external TVS diodes for transient suppression, implement input fusing, and strictly derate the operating voltage to ≤24V. Consider migrating to a more robust alternative like the TPS7B4250-Q1 if long-term reliability is critical.
How does the enable pin behavior of the LM3490IM5-12 affect system power sequencing in multi-rail designs, and what pull-up/pull-down strategies are needed to avoid unintended turn-on during startup?
The LM3490IM5-12 features an active-high enable pin with a typical threshold around 1.2V, but it lacks internal pull-up or pull-down resistors. In multi-rail systems, floating enable pins can cause unintended turn-on during power-up due to leakage currents or capacitive coupling, leading to incorrect power sequencing and potential latch-up in downstream ICs. To ensure reliable control, always tie the enable pin to a defined logic level using a 10kΩ resistor—pull to ground if default-off behavior is desired, or connect to VIN through a resistor if auto-start is acceptable. For microprocessor-controlled systems, use a GPIO with a series resistor and ensure the MCU initializes the pin state before applying input power. Avoid long traces to the enable pin to minimize noise pickup, especially in high-dV/dt environments.
Given that the LM3490IM5-12 is obsolete and RoHS non-compliant, what are the compliance and supply chain risks for continued use in new medical device designs, and which modern equivalents should be considered for redesign?
Using the LM3490IM5-12 in new medical device designs poses serious compliance and supply chain risks. Its obsolete status means Texas Instruments no longer guarantees production support, and its RoHS non-compliant status may violate EU MDR and other global regulations, blocking market access. Additionally, reliance on aftermarket stock increases exposure to counterfeit parts. For medical applications requiring high reliability and regulatory compliance, migrate to a modern, fully qualified alternative such as the TPS7A4700 (36V input, 1A, ultra-low noise, adjustable output) or the LM3480IM3X-12/NOPB (if 26V input suffices), both of which are RoHS-compliant and supported under TI’s medical-grade qualification programs. Redesign efforts should include full re-validation of PSRR, transient response, and EMI performance to meet IEC 60601 standards.
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LM3490IM5-12 CAD Models
Texas Instruments LM3490IM5-12 PCB symbols & footprints
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