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LM317KCE3
Texas Instruments
IC REG LIN POS ADJ 1.5A TO220-3
18173 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Adjustable 1 Output 1.5A TO-220-3
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5.0 / 5.0
- (131 Ratings)
LM317KCE3
Product Overview
13030542
DiGi Electronics Part Number
LM317KCE3-DGManufacturer
Texas Instruments
LM317KCE3
Description
IC REG LIN POS ADJ 1.5A TO220-3Inventory
18173 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Adjustable 1 Output 1.5A TO-220-3
Quantity
Minimum 1
Minimum 1
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LM317KCE3 Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
Packaging
-
Series
-
Packaging
Tube
Part Status
Obsolete
Output Configuration
Positive
Output Type
Adjustable
Number of Regulators
1
Voltage - Input (Max)
40V
Voltage - Output (Min/Fixed)
1.25V
Voltage - Output (Max)
37V
Voltage Dropout (Max)
-
Current - Output
1.5A
Current - Quiescent (Iq)
10 mA
PSRR
80dB ~ 65dB (120Hz)
Control Features
-
Protection Features
Over Current, Over Temperature, Short Circuit
Operating Temperature
0°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-220-3
Supplier Device Package
TO-220-3
Base Product Number
LM317
Datasheet & Documents
HTML Datasheet
LM317KCE3-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0060
Additional Information
Other Names
2156-LM317KCE3-TI
TEXTISLM317KCE3
Standard Package
1,000
Alternative Parts
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SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
가격이 합리적이고 응대도 친절해서 계속 찾는 곳이에요.
Dec 02, 2025
DiGi Electronics maintient un niveau exceptionnel en termes de ponctualité dans leurs envois.
Dec 02, 2025
I feel confident purchasing from DiGi Electronics because of their reliable support.
Dec 02, 2025
Their after-sales response is almost instant; they address my issues promptly and effectively.
Dec 02, 2025
DiGi’s attention to detail in product design is remarkable and appreciated.
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Frequently Asked Questions (FAQ)
Can the LM317KCE3 be used as a direct replacement for the LM317T in a high-temperature industrial power supply design operating near 120°C ambient?
No, the LM317KCE3 is not recommended for continuous operation near 120°C ambient due to its maximum junction temperature of 125°C and lack of thermal margin. The LM317T (also from Texas Instruments) has identical electrical specs but may have slightly better thermal characterization in some application notes. However, both share the same 125°C Tj(max), so neither is ideal. For high-temperature environments, consider a switching regulator or a regulator rated for 150°C junction temperature. If you must use the LM317KCE3, ensure aggressive heatsinking, forced airflow, and derate output current significantly—ideally below 0.5A—to keep junction temperature under 110°C for long-term reliability.
What are the key reliability risks when using the LM317KCE3 in an automotive under-hood application with frequent thermal cycling between -20°C and 85°C?
The LM317KCE3, while RoHS3 compliant and MSL 1 (unlimited floor life), was not designed for automotive-grade qualification (AEC-Q100). Repeated thermal cycling can cause solder joint fatigue at the TO-220 leads and delamination at the die attach, especially if mounted on an undersized heatsink. Additionally, input voltage spikes above 40V—common in automotive load dump scenarios—can exceed its absolute maximum rating and cause latent or immediate failure. For under-hood use, replace the LM317KCE3 with an AEC-Q100 qualified alternative like the LM317A-Q1 or use a TVS diode on the input and a conformal coating to mitigate environmental stress.
How does the LM317KCE3 compare to the LM317KCSE3 in terms of long-term availability and design continuity for legacy industrial systems?
The LM317KCE3 is marked as obsolete by Texas Instruments, while the LM317KCSE3 remains active and is the recommended drop-in replacement. Both share identical pinout, electrical characteristics, and TO-220-3 packaging, but the LM317KCSE3 benefits from ongoing manufacturing support and traceability. Continuing to design with the LM317KCE3 poses supply chain risk—especially with only 18,100 units in stock—and may require costly last-time buys. For new designs or revisions, migrate to the LM317KCSE3 to ensure long-term availability and avoid end-of-life disruptions.
Is it safe to parallel two LM317KCE3 regulators to increase output current beyond 1.5A in a precision analog power rail?
No, paralleling LM317KCE3 devices without current-sharing circuitry is unsafe and unreliable. The LM317KCE3 lacks built-in current sharing or ballast features, and minor variations in output voltage (due to resistor tolerances or thermal gradients) will cause one regulator to carry most of the load, leading to thermal runaway. Even with matched resistors, the positive temperature coefficient of the reference isn’t sufficient to ensure balance. Instead, use a single higher-current regulator like the LM338 (5A) or implement an external current-sharing scheme with ballast resistors (≥0.5Ω per amp) and thermal coupling. For precision rails, consider a low-noise LDO with higher current capability to avoid complexity and noise from paralleling.
What input filtering is required when using the LM317KCE3 downstream of a noisy switch-mode pre-regulator in a medical device power supply?
When powered by a switch-mode supply, the LM317KCE3 requires robust input filtering to prevent high-frequency noise from coupling into sensitive analog circuits. Although it has good PSRR (80dB at 120Hz), PSRR drops significantly above 10kHz—typical of linear regulators. Add a π-filter (e.g., 10µF ceramic + 10µH ferrite bead + 10µF ceramic) at the input, followed by a 1µF ceramic capacitor close to the LM317KCE3 pin. Also include a 0.1µF ceramic capacitor directly at the output to improve transient response. Without this filtering, conducted emissions from the SMPS can modulate the LM317KCE3’s reference, causing ripple in the output that may exceed medical EMC limits (e.g., IEC 60601-1-2).
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LM317KCE3 CAD Models
Texas Instruments LM317KCE3 PCB symbols & footprints
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