AT9917TS-G LED Driver Controller - Equivalent & Substitute Parts

Part Overview

The AT9917TS-G is an active LED driver controller IC manufactured by Microchip Technology, designed for power management applications requiring multi-topology DC-DC conversion. This 24-TSSOP surface mount device supports SEPIC, step-down (buck), and step-up (boost) topologies with analog and PWM dimming capabilities. The part is currently in active production status with AEC-Q100 automotive qualification and ROHS3 compliance. Substitute parts are identified when original inventory is unavailable or when design requirements necessitate alternative electrical specifications, package configurations, or supply voltage ranges.

Substiute Parts

AT9917TS-G

Microchip TechnologyIn Stock: 12330AT9917TS-G Datasheet

Current PartRFQ

LM3421MH/NOPB

Texas InstrumentsIn Stock: 1525LM3421MH/NOPB Datasheet

MFR RecommendedRFQ

LT3756IUD-2#PBF

Analog Devices Inc.In Stock: 2313LT3756IUD-2#PBF Datasheet

MFR RecommendedRFQ

LT3795EFE#TRPBF

Analog Devices Inc.In Stock: 3355LT3795EFE#TRPBF Datasheet

MFR RecommendedRFQ

LT3796EFE-1#PBF

Analog Devices Inc.In Stock: 2764LT3796EFE-1#PBF Datasheet

MFR RecommendedRFQ

MAX16821AATI+

Analog Devices Inc./Maxim IntegratedIn Stock: 1177MAX16821AATI+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AT9917TS-G are selected based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

• DC-DC controller topology support (SEPIC, step-down buck, step-up boost)
• Single output configuration
• Analog and PWM dimming capability
• Supply voltage range compatibility (minimum 5.3V to 40V overlap required)
• Switching frequency range (100kHz to 800kHz operation window)
• Surface mount package with single output
• Active product status
• ROHS3 compliance

Secondary Considerations:

• Operating temperature range (-40°C minimum required)
• Package form factor (TSSOP or QFN variants acceptable for surface mount assembly)
• Moisture sensitivity level and storage requirements
• Automotive or industrial grade qualification

The identified substitute parts maintain functional equivalence through topology support and dimming control methods while accommodating variations in package size, pin count, and extended supply voltage ranges.

Parameter Comparison

Engineering Selection Recommendations

LM3421MH/NOPB (Texas Instruments) is the manufacturer-recommended primary substitute. This part maintains SEPIC, step-down, and step-up topology support with analog and PWM dimming. The 16-PowerTSSOP package requires PCB layout modification due to reduced pin count compared to the 24-TSSOP original. Supply voltage range extends to 75V maximum, supporting applications requiring higher input voltages. Operating temperature minimum of -40°C matches the original specification. MSL rating of 1 (unlimited) provides superior moisture handling compared to the AT9917TS-G MSL 3 rating.

LT3756IUD-2#PBF (Analog Devices Inc.) offers extended topology support including flyback configuration, enabling broader application flexibility. The 16-QFN (3x3) package presents the smallest footprint among substitutes, suitable for space-constrained designs. Supply voltage range extends to 100V maximum. Frequency range of 100kHz to 1MHz overlaps the original specification. MSL 1 rating and unlimited moisture sensitivity provide enhanced reliability.

LT3795EFE#TRPBF (Analog Devices Inc.) provides the highest supply voltage maximum at 110V in a 28-TSSOP package with exposed pad. Pin count increase from 24 to 28 requires schematic and layout review. Frequency range of 100kHz to 1MHz maintains compatibility with the original operating window. MSL 1 rating ensures superior moisture protection.

LT3796EFE-1#PBF (Analog Devices Inc.) maintains SEPIC, step-down, and step-up topology support in a 28-TSSOP package configuration. Supply voltage range of 6V to 100V accommodates mid-to-high voltage applications. Frequency range of 100kHz to 1MHz aligns with original specifications. True Color PWM™ series designation indicates specialized dimming control. MSL 1 rating provides unlimited moisture sensitivity.

MAX16821AATI+ (Analog Devices Inc./Maxim Integrated) supports SEPIC, step-down, and step-up topologies in a 28-WFQFN (5x5) package. Supply voltage range of 4.75V to 28V is the most restrictive among substitutes, limiting application to lower voltage systems. PWM dimming is supported; analog dimming is not available. Frequency range of 125kHz to 1.5MHz extends beyond the original specification. MSL 1 rating provides unlimited moisture sensitivity.

All substitute parts maintain active product status and ROHS3 compliance, ensuring long-term availability and regulatory conformance.

Frequently Asked Questions (FAQ)

Q: Can the LM3421MH/NOPB replace the AT9917TS-G in existing designs without modification?

A: The LM3421MH/NOPB maintains functional topology and dimming support but requires PCB layout modification. The 16-PowerTSSOP package contains fewer pins (16 vs. 24) than the original 24-TSSOP, necessitating schematic review and PCB redesign. Pin assignments differ between parts and must be verified against respective datasheets before implementation.

Q: What is the impact of MSL rating differences between the AT9917TS-G and substitute parts?

A: The AT9917TS-G carries MSL 3 (168 hours maximum floor life), while all substitute parts carry MSL 1 (unlimited floor life). MSL 1 rated parts tolerate extended storage and handling without moisture absorption concerns, reducing production risk and enabling longer inventory holding periods. MSL 3 parts require stricter moisture control during assembly and storage.

Q: Which substitute part is suitable for applications requiring supply voltages above 40V?

A: LT3756IUD-2#PBF, LT3795EFE#TRPBF, and LT3796EFE-1#PBF all support supply voltages up to 100V or higher, compared to the AT9917TS-G maximum of 40V. LT3795EFE#TRPBF extends to 110V maximum. Applications requiring 75V to 100V input should evaluate these parts based on package compatibility and topology requirements.

Q: Are all substitute parts qualified for automotive applications?

A: The AT9917TS-G carries AEC-Q100 automotive qualification. Substitute parts do not explicitly list automotive qualification in the provided specifications. Applications requiring automotive-grade components should verify AEC-Q100 or equivalent qualification status with manufacturers before design implementation.

Q: What package considerations apply when selecting a substitute?

A: The AT9917TS-G uses 24-TSSOP packaging. Substitutes employ 16-PowerTSSOP, 16-QFN (3x3), 28-TSSOP, or 28-WFQFN (5x5) packages. Package changes require PCB layout redesign, including trace routing, thermal management, and decoupling capacitor placement. QFN packages with exposed pads provide superior thermal performance compared to TSSOP variants. Pin count increases (24 to 28) or decreases (24 to 16) necessitate full schematic verification.

Q: Can the MAX16821AATI+ be used in applications requiring analog dimming?

A: No. The MAX16821AATI+ supports PWM dimming only. Analog dimming capability is not available. Applications requiring both analog and PWM dimming control must select LM3421MH/NOPB, LT3756IUD-2#PBF, LT3795EFE#TRPBF, or LT3796EFE-1#PBF.

Q: What is the frequency range compatibility between the AT9917TS-G and substitute parts?

A: The AT9917TS-G operates at 100kHz to 800kHz. All substitute parts support minimum 100kHz operation. LM3421MH/NOPB operates at 2MHz, LT3756IUD-2#PBF at 100kHz to 1MHz, LT3795EFE#TRPBF at 100kHz to 1MHz, LT3796EFE-1#PBF at 100kHz to 1MHz, and MAX16821AATI+ at 125kHz to 1.5MHz. Frequency range differences may affect EMI characteristics and component selection in power stage design.