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LM117H/NOPB
Texas Instruments
IC REG LINEAR POS ADJ 1.5A TO3
6775 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Adjustable 1 Output 1.5A TO-3
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5.0 / 5.0
- (305 Ratings)
LM117H/NOPB
Product Overview
1369078
DiGi Electronics Part Number
LM117H/NOPB-DGManufacturer
Texas Instruments
LM117H/NOPB
Description
IC REG LINEAR POS ADJ 1.5A TO3Inventory
6775 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Adjustable 1 Output 1.5A TO-3
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
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LM117H/NOPB Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
Packaging
Bulk
Series
-
Product Status
Last Time Buy
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)
5 mA
PSRR
80dB ~ 65dB (120Hz)
Control Features
-
Protection Features
Over Current, Over Temperature, Short Circuit
Operating Temperature
-55°C ~ 150°C (TJ)
Mounting Type
Through Hole
Package / Case
TO-205AD, TO-39-3 Metal Can
Supplier Device Package
TO-3
Base Product Number
LM117
Datasheet & Documents
HTML Datasheet
LM117H/NOPB-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
-LM117H/NOPB-DG
*LM117H/NOPB
LM117HNOPB
2156-LM117H/NOPB-TI
TEXTISLM117H/NOPB
Standard Package
500
Alternative Parts
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MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
빠른 배송과 경제적인 가격, 두 마리 토끼를 잡은 최고의 쇼핑몰입니다.
de desembre 02, 2025
저렴한 가격이지만 품질이 정말 좋아서 추천해드리고 싶어요.
de desembre 02, 2025
Je recommande vivement! La rapidité d'expédition est impressionnante et le choix de produits est vaste.
de desembre 02, 2025
Der Kundenkontakt war sehr angenehm, sie haben regelmäßig Updates zum Versandstatus gegeben.
de desembre 02, 2025
The team handled my requests with patience and understanding.
de desembre 02, 2025
I am very satisfied with their rapid response to my post-purchase questions. Highly recommended!
de desembre 02, 2025
Their competitive pricing helps me upgrade my work tools efficiently.
de desembre 02, 2025
Consistent and quick after-sales response enhances our purchasing confidence.
de desembre 02, 2025
Reliability is what sets DiGi Electronics apart in the industry; they never let me down.
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Frequently Asked Questions (FAQ)
What are the key thermal design considerations when using the LM117H/NOPB in a high-current application at elevated ambient temperatures?
When using the LM117H/NOPB at output currents near its 1.5A maximum in environments above 70°C, thermal management becomes critical due to power dissipation (P ≈ (VIN - VOUT) × ILOAD + VIN × IQ). The TO-3 package has a junction-to-ambient thermal resistance (θJA) of approximately 50°C/W when mounted without a heatsink. To avoid triggering the internal thermal shutdown, a properly sized heatsink with adequate airflow is required—especially when dropping from high input voltages like 30V to 5V at full load, where power dissipation can exceed 40W. Use thermal interface material and verify operation under worst-case conditions by calculating TJ = TA + (P × θJA). Derate current or add forced cooling if TJ approaches the 150°C limit.
Can the LM1117-5.0 be used as a drop-in replacement for the LM117H/NOPB in new designs?
No, the LM1117-5.0 is not a drop-in replacement for the LM117H/NOPB due to significant differences in electrical and mechanical characteristics. The LM117H/NOPB is an adjustable linear regulator with a TO-3 metal can package, higher current capability (1.5A), and extended thermal and temperature range (-55°C to 150°C), making it suitable for industrial and military environments. The LM1117-5.0 is a fixed 5V, 1A regulator in a smaller SMT package with lower thermal performance. Substituting it would risk thermal overload, loss of adjustability, and reduced reliability in harsh conditions. For legacy or high-reliability designs requiring drop-in compatibility, consider the LM317K instead—but verify current and thermal specs.
How does the LM117H/NOPB handle line and load transients in sensitive analog systems, and what external components improve PSRR?
The LM117H/NOPB provides 65dB to 80dB PSRR at 120Hz, which helps suppress ripple in line-regulated applications such as precision analog front-ends or sensor conditioning circuits. However, PSRR degrades significantly above 1kHz, so for sensitive systems powered by switching supplies, additional filtering is recommended. Place a low-ESR 10μF tantalum or ceramic capacitor at the input and a 1μF capacitor at the output in parallel with the standard 10μF aluminum electrolytic. Adding a small capacitor (10nF) across the adjust pin resistor divider further improves PSRR and transient response by reducing noise gain. Always bypass the adjust pin to ground with a 10μF capacitor if used in noisy environments.
What are the risks of using the LM117H/NOPB in a battery-powered system where input voltage drops below the required headroom?
The LM117H/NOPB has no fixed dropout voltage specified in the datasheet, but it typically requires 2–3V of headroom (VIN - VOUT) to maintain regulation. In battery-powered systems, such as those using 12V lead-acid or 3-cell Li-ion, discharging below this threshold causes the output to drop out of regulation—risking system resets or erratic behavior. For example, regulating 9V output requires VIN > 11V to remain stable. Monitor battery voltage and implement undervoltage lockout (UVLO) to prevent deep discharge or use a low-dropout (LDO) alternative like the LT1086-9 for tighter headroom. Also note the quiescent current (~5mA) flows even under dropout, reducing standby efficiency.
Is the LM117H/NOPB suitable for automotive under-hood applications, and what failure modes should be mitigated?
The LM117H/NOPB can operate from -55°C to 150°C (TJ), making it technically capable of surviving under-hood temperatures, but its lack of integrated automotive-grade protections limits reliability in 12V vehicle systems. Transient voltage spikes (load dump, double battery) can exceed the 40V input limit, posing a risk of permanent damage. Always include external protection: a transient voltage suppressor (TVS) diode rated for ISO 7637-2 pulses, input series fuse, and reverse-polarity protection diode. Also, ensure mechanical mounting avoids vibration-induced fatigue in the TO-3 can. While robust, the LM117H/NOPB is not AEC-Q100 qualified—designers needing automotive compliance should evaluate alternatives like the LM2940C-12, but verify adjustability and thermal requirements match the application.
Quality Assurance (QC)
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LM117H/NOPB CAD Models
Texas Instruments LM117H/NOPB PCB symbols & footprints
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