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LM2597N-ADJ
Texas Instruments
IC REG BUCK ADJ 500MA 8DIP
2957 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1.2V 1 Output 500mA 8-DIP (0.300", 7.62mm)
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5.0 / 5.0
- (359 Ratings)
LM2597N-ADJ
Product Overview
1283355
DiGi Electronics Part Number
LM2597N-ADJ-DGManufacturer
Texas Instruments
LM2597N-ADJ
Description
IC REG BUCK ADJ 500MA 8DIPInventory
2957 Pcs New Original In Stock
Buck Switching Regulator IC Positive Adjustable 1.2V 1 Output 500mA 8-DIP (0.300", 7.62mm)
Quantity
Minimum 1
Minimum 1
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LM2597N-ADJ Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - DC DC Switching Regulators
Packaging
-
Series
SIMPLE SWITCHER®
Product Status
Obsolete
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Output Type
Adjustable
Number of Outputs
1
Voltage - Input (Min)
4.5V
Voltage - Input (Max)
40V
Voltage - Output (Min/Fixed)
1.2V
Voltage - Output (Max)
37V
Current - Output
500mA
Frequency - Switching
150kHz
Synchronous Rectifier
No
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Supplier Device Package
8-PDIP
Base Product Number
LM2597
Datasheet & Documents
HTML Datasheet
LM2597N-ADJ-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
Standard Package
40
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
Leur engagement envers la satisfaction client est évident à travers leur support et leur rapidité.
de desembre 02, 2025
DiGi Electronics überzeugt durch schnelle Lieferung und unschlagbare Preise – absolut empfehlenswert!
de desembre 02, 2025
DiGi Electronics is clearly committed to making a positive environmental impact.
de desembre 02, 2025
Their support team goes above and beyond to ensure customer satisfaction.
de desembre 02, 2025
They consistently deliver products that meet the highest industry standards.
de desembre 02, 2025
Their customer service team is knowledgeable and genuinely cares about client needs.
de desembre 02, 2025
Customer service responded promptly when I inquired about shipping speeds.
de desembre 02, 2025
Fast shipping combined with reliable after-sales support makes them my preferred vendor.
de desembre 02, 2025
Tracking my shipments has never been more straightforward and reliable.
de desembre 02, 2025
The efficiency of DiGi Electronics’s delivery service is commendable.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the LM2597N-ADJ in a high-temperature industrial application near its maximum junction temperature?
When designing with the LM2597N-ADJ in high-ambient-temperature environments, thermal management is critical due to its lack of synchronous rectification, which increases power loss and heat generation. At load currents above 300mA or input voltages over 24V, ensure adequate copper pour and through-hole vias for heat dissipation. Derate output current by at least 20% when operating above 100°C ambient to maintain junction temperature below 125°C. Consider adding a heatsink on the ground pin if thermal resistance exceeds 100°C/W. Monitor thermal shutdown behavior during startup under full load to prevent cycling.
How does the LM2597N-ADJ compare to modern drop-in replacements like the LM2596 or MP1584 in terms of efficiency and PCB footprint for a 12V to 5V conversion at 500mA?
The LM2597N-ADJ has lower efficiency—typically 70–75% in 12V-to-5V @ 500mA applications—compared to the LM2596 (78%) or MP1584 (85%) due to its non-synchronous design and fixed 150kHz switching frequency. This requires a larger external inductor and results in higher ripple current. While pin-compatible with other 8-PDIP buck regulators, the LM2597N-ADJ's older architecture limits switching frequency scalability, making noise filtering harder in sensitive circuits. For space-constrained designs, the MP1584 offers a smaller overall footprint with better thermal performance, but requires re-layout as it's not pin-to-pin compatible.
Can the LM2597N-ADJ be safely used as a drop-in replacement for the obsolete LM2597N-ADJ/NOPB in new designs despite its RoHS non-compliance?
Although the LM2597N-ADJ shares functional compatibility with the LM2597N-ADJ/NOPB, its RoHS non-compliance poses regulatory risks for new commercial or consumer product designs targeting international markets. The /NOPB variant was specifically released to meet environmental standards. Using the non-compliant version may invalidate certifications like CE or FCC. For industrial or legacy repair applications where lifecycle longevity isn’t required, it may still be viable. Evaluate long-term supply stability—TI has marked this device as obsolete—favoring newer AEC-Q100 qualified alternatives with extended availability and lead-free finishes.
What layout precautions should be taken when integrating the LM2597N-ADJ in a noise-sensitive analog measurement system?
The LM2597N-ADJ’s 150kHz non-synchronous switching generates significant EMI, posing risks in precision analog systems. Minimize noise by keeping the input capacitor loop (preferably a 100µF low-ESR electrolytic + 0.1µF ceramic) as tight as possible to the VIN and GND pins. Use a Schottky diode (e.g., 1N5819) with a short cathode trace to reduce ringing. Route the feedback trace away from inductors and switching nodes, and guard it with grounded traces. Adding LC post-filtering (e.g., 10µH inductor + 220µF output cap) improves ripple suppression. Avoid sharing ground planes between analog and switch sections; use a star grounding scheme.
What reliability concerns should be considered when using the obsolete LM2597N-ADJ in a long-life embedded power supply design?
Using the obsolete LM2597N-ADJ in long-life systems introduces significant supply-chain and reliability risks. With no future availability guarantees from Texas Instruments, component obsolescence may force redesigns mid-lifecycle. Additionally, the non-synchronous design stresses the external diode under repeated thermal cycling, increasing failure risk in environments with frequent power cycling. The through-hole package offers mechanical robustness, but aging of external components—especially electrolytic capacitors—must be factored. Mitigate by qualifying second sources like the LM2576 or redesigned SMD-based solutions early, and stockpile sufficient units with controlled storage conditions for repair cycles.
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.
LM2597N-ADJ CAD Models
Texas Instruments LM2597N-ADJ PCB symbols & footprints
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