AL1781T16E-13 LED Driver IC Equivalent & Substitute Parts

Part Overview

The AL1781T16E-13 is a linear PWM LED driver IC manufactured by Diodes Incorporated, designed for single-output lighting applications. This device operates across a 6.5V to 30V supply range with 1.5A output current capability and features PWM dimming control in a 16-TSSOP package with exposed pad.

The AL1781T16E-13 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Substitute selection must maintain compatibility with the original electrical specifications and mechanical form factor constraints.

Substiute Parts

AL1781T16E-13

Diodes IncorporatedIn Stock: 7928AL1781T16E-13 Datasheet

Current PartRFQ

AL1783T16E-13

Diodes IncorporatedIn Stock: 5934AL1783T16E-13 Datasheet

MFR RecommendedRFQ

APS13568ELJATR

Allegro MicroSystemsIn Stock: 3619APS13568ELJATR Datasheet

MFR RecommendedRFQ

MAX16835ATE+

Analog Devices Inc./Maxim IntegratedIn Stock: 879MAX16835ATE+ Datasheet

MFR RecommendedRFQ

MIC4802YME

Microchip TechnologyIn Stock: 2420MIC4802YME Datasheet

MFR RecommendedRFQ

NUD4001DR2G

onsemiIn Stock: 31791NUD4001DR2G Datasheet

MFR RecommendedRFQ

TL4242DRJR

Texas InstrumentsIn Stock: 35333TL4242DRJR Datasheet

MFR RecommendedRFQ

TSCR421CX6 RFG

Taiwan Semiconductor CorporationIn Stock: 3989TSCR421CX6 RFG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AL1781T16E-13 are selected based on the following critical parameters that determine functional compatibility:

Primary Selection Criteria:

• Single output configuration (Number of Outputs = 1)
• Linear topology with PWM dimming capability
• Supply voltage range overlap with 6.5V minimum and 30V maximum
• Output current capability at or above 1.5A
• Surface mount packaging suitable for PCB integration
• Operating temperature range of -40°C to 125°C or better

Secondary Considerations:

• Package form factor (TSSOP, SOIC, SON, or TQFN variants acceptable based on PCB layout constraints)
• RoHS3 compliance for regulatory alignment
• Active product status preferred for long-term availability

Substitutes are grouped by electrical performance tier and package compatibility. Parts with lower output current ratings (125mA, 150mA, 350mA, 500mA, 800mA) are listed as alternatives where application requirements permit reduced current delivery. Parts with different package types (8-SOIC, 8-SON, 16-TQFN) are included where pin configuration and thermal characteristics remain compatible.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: AL1783T16E-13

The AL1783T16E-13 from Diodes Incorporated is the manufacturer-recommended equivalent. It maintains identical package geometry (16-TSSOP Exposed Pad), supply voltage range (6.5V to 60V), and operating temperature specification (-40°C to 125°C). The AL1783T16E-13 is active in production and ROHS3 compliant. The primary difference is output configuration: three outputs at 125mA per channel versus one output at 1.5A. This part is suitable where the application can accommodate multiple lower-current outputs or where a single 375mA aggregate output (3 × 125mA) meets requirements.

Secondary Substitutes by Current Capability:

For 500mA applications: NUD4001DR2G (onsemi) and TL4242DRJR (Texas Instruments) both deliver 500mA in 8-SOIC and 8-SON packages respectively. Both support 30V+ supply ranges and maintain -40°C to 125°C+ operating temperatures. NUD4001DR2G includes automotive grade qualification. TL4242DRJR extends to 150°C junction temperature.

For 350mA applications: MAX16835ATE+ (Analog Devices/Maxim) provides 350mA in a 16-TQFN package with 6.5V to 40V supply range and automotive grade qualification. Operating temperature reaches 125°C (junction).

For 800mA applications: MIC4802YME (Microchip) delivers 800mA but operates within a restricted 3V to 5.5V supply range, suitable only for low-voltage LED driver applications.

For low-current applications: TSCR421CX6 RFG (Taiwan Semiconductor) provides 11mA output in SOT-26 package. This part is obsolete but included for reference in legacy designs.

Compliance and Availability:

All active substitutes carry ROHS3 compliance and REACH unaffected status. Inventory availability ranges from 859 to 35,300 units across the substitute portfolio. Selection should prioritize active-status parts (AL1783T16E-13, APS13568ELJATR, MAX16835ATE+, MIC4802YME, NUD4001DR2G, TL4242DRJR) over obsolete alternatives for new designs and long-term production support.

Frequently Asked Questions (FAQ)

Q: Can AL1783T16E-13 directly replace AL1781T16E-13 in existing designs?

A: AL1783T16E-13 shares identical package (16-TSSOP Exposed Pad) and supply voltage range (6.5V to 60V). However, it provides three 125mA outputs instead of one 1.5A output. Direct replacement requires circuit redesign if the application demands a single 1.5A output. If the design can distribute current across three channels or operate at reduced current levels, substitution is feasible with minimal PCB modification.

Q: What is the minimum output current requirement for selecting a substitute?

A: The AL1781T16E-13 delivers 1.5A per output. Substitutes with lower current ratings (125mA, 150mA, 350mA, 500mA, 800mA) are acceptable only if the LED load or application circuit requires less than the substitute's rated current. Exceeding a substitute's current rating causes thermal stress and device failure. Verify LED forward current and total load current before selection.

Q: Are package changes acceptable when substituting?

A: Package changes from 16-TSSOP to 8-SOIC, 8-SON, or 16-TQFN require PCB layout modification, including trace routing, thermal pad design, and component placement. Pin configurations differ across packages. Electrical functionality remains compatible if supply voltage, output current, and dimming control specifications align. Consult PCB design guidelines for the target package before committing to a package-different substitute.

Q: Which substitutes support automotive-grade applications?

A: MAX16835ATE+ and NUD4001DR2G both carry automotive grade qualification. TSCR421CX6 RFG also includes automotive grade but is obsolete. Automotive-grade parts undergo extended temperature and reliability testing suitable for vehicle lighting and powertrain applications.

Q: What is the supply voltage overlap between AL1781T16E-13 and available substitutes?

A: AL1781T16E-13 operates from 6.5V to 30V. Substitutes with overlapping ranges include AL1783T16E-13 (6.5V to 60V), MAX16835ATE+ (6.5V to 40V), NUD4001DR2G (3.6V to 30V), and TL4242DRJR (4.5V to 42V). APS13568ELJATR operates 7V to 24V (narrower range). MIC4802YME is restricted to 3V to 5.5V (incompatible with 6.5V minimum). TSCR421CX6 RFG maximum is 4.5V (incompatible).

Q: Does dimming control differ across substitutes?

A: AL1781T16E-13 uses PWM dimming. All listed substitutes except TL4242DRJR support PWM dimming. TL4242DRJR does not specify dimming control in the provided parameters. If PWM dimming is required, exclude TL4242DRJR from consideration.

Q: What is the moisture sensitivity level (MSL) impact on storage and handling?

A: AL1781T16E-13 has MSL 1 (unlimited shelf life). Most substitutes carry MSL 1 or MSL 2 (1 year). APS13568ELJATR and NUD4001DR2G have MSL 3 (168 hours), requiring controlled storage conditions and bake-out procedures before reflow soldering. MSL 3 parts demand stricter moisture management during manufacturing.