ZXLD1366QDACTC LED Driver IC Equivalent & Substitute Parts

Part Overview

The ZXLD1366QDACTC is a DC-DC step-down (buck) LED driver IC manufactured by Diodes Incorporated, designed for automotive-grade lighting applications. This device integrates an internal switch with PWM dimming capability, delivering 1A output current from a 6V to 60V input supply range. The part operates at 1MHz switching frequency and is packaged in a 6-VDFN form factor with AEC-Q100 automotive qualification.

Substitute parts are identified when product availability changes, manufacturing discontinuation occurs, or design flexibility permits alternative topologies while maintaining functional compatibility within specified electrical and mechanical constraints.

Key Parameters

Parameter	ZXLD1366QDACTC
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Down (Buck)
Number of Outputs	1
Voltage Supply (Min)	6V
Voltage Supply (Max)	60V
Current Output / Channel	1A
Switching Frequency	1MHz
Dimming	PWM
Operating Temperature	-40°C ~ 125°C (TA)
Grade	Automotive
Qualification	AEC-Q100
Package / Case	6-VDFN Exposed Pad
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts are classified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Topology: Step-Down (Buck) configuration
Number of Outputs: Single output
Dimming Method: PWM or Analog/PWM capable
Internal Switch: Present
Operating Temperature Range: -40°C to 125°C minimum
Automotive Grade and AEC-Q100 qualification preferred for direct replacement

Secondary Compatibility Factors:

Input voltage range overlap with 6V–60V specification
Output current capability ≥ 1A or application-specific requirements
Switching frequency in the 300kHz–2MHz range
Surface mount packaging suitable for PCB integration

Substitutes are grouped into three categories:

Direct Replacements (Automotive-Qualified): Parts with AEC-Q100 qualification, automotive grade, and matching topology
Functional Equivalents (Non-Automotive): Parts meeting electrical specifications but without automotive qualification
Topology Variants: Parts with alternative topologies (boost, SEPIC, flyback) suitable only for specific application requirements

Parameter Comparison

Part Number	Manufacturer	Topology	Voltage Supply (Min–Max)	Current Output	Dimming	Frequency	Package	Automotive Grade	AEC-Q100
ZXLD1366QDACTC	Diodes Inc.	Step-Down (Buck)	6V–60V	1A	PWM	1MHz	6-VDFN	Yes	Yes
A6214KLKTR-T	Allegro MicroSystems	Step-Down (Buck)	4.5V–55V	2A	Analog, PWM	—	10-SOIC	Yes	Yes
CAV4201TD-GT3	onsemi	Step-Down (Buck)	6.5V–36V	350mA	Analog	50kHz–1MHz	TSOT-23-5	No	No
LM3402HVMRX/NOPB	National Semiconductor	Step-Down (Buck)	6V–75V	500mA	PWM	1MHz	8-PowerSOIC	No	No
LM3405XMKX/NOPB	Texas Instruments	Step-Down (Buck)	3V–15V	1A	PWM	1.6MHz	TSOT-23-6	No	No
LM3407MYX/NOPB	Texas Instruments	Step-Down (Buck)	4.5V–30V	350mA	PWM	300kHz–1MHz	8-HVSSOP	No	No
LM3414HVSD/NOPB	Texas Instruments	Step-Down (Buck)	4.5V–65V	1A	Analog, PWM	500kHz	8-WSON (3x3)	Yes	No
LT3465AES6#TRMPBF	Analog Devices Inc.	Step-Up (Boost)	2.7V–16V	225mA (Switch)	PWM	2.4MHz	TSOT-23-6	No	No
LT3474EFE-1#PBF	Analog Devices Inc.	Step-Down (Buck)	4.6V–36V	1A	PWM	200kHz–2MHz	16-TSSOP-EP	Yes	No
LT3932EUFD#PBF	Analog Devices Inc.	Step-Down (Buck)	3.6V–36V	2A	Analog, PWM	200kHz–2MHz	28-QFN (4x5)	Yes	No
LT3956IUHE#PBF	Analog Devices Inc.	Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost)	4.5V–80V	3.3A (Switch)	Analog, PWM	100kHz–1MHz	36-QFN (5x6)	No	No

Engineering Selection Recommendations

Direct Replacement (Automotive-Qualified, AEC-Q100):

The A6214KLKTR-T (Allegro MicroSystems) is the primary direct substitute. It maintains automotive grade and AEC-Q100 qualification, operates in step-down topology with 1A minimum output capability (rated 2A), and supports both analog and PWM dimming. Input voltage range (4.5V–55V) overlaps the ZXLD1366QDACTC specification. Package transition from 6-VDFN to 10-SOIC requires PCB layout modification.

Secondary Automotive-Grade Option:

The LM3414HVSD/NOPB (Texas Instruments) provides automotive-grade classification with 1A output current and dual dimming capability (analog and PWM). Input voltage range extends to 65V, exceeding the original specification. AEC-Q100 qualification is not listed; verify compliance requirements for your application.

Functional Equivalents (Non-Automotive Applications):

For non-automotive lighting applications, the following parts provide functional equivalence:

LM3405XMKX/NOPB: 1A output, PWM dimming, 1.6MHz frequency. Input range limited to 3V–15V; suitable for low-voltage LED applications only.
LM3407MYX/NOPB: 350mA output, PWM dimming, 300kHz–1MHz frequency. Input range 4.5V–30V; suitable for lower-power lighting circuits.
LT3474EFE-1#PBF: 1A output, PWM dimming, 200kHz–2MHz frequency. Input range 4.6V–36V; automotive-grade classification present but AEC-Q100 not confirmed.

Topology Variants (Application-Specific):

The LT3956IUHE#PBF supports multiple topologies (flyback, SEPIC, step-down, step-up) with 3.3A switch current and 4.5V–80V input range. This part is suitable only for applications requiring topology flexibility beyond standard buck regulation.

The LT3465AES6#TRMPBF employs step-up (boost) topology; use only when output voltage must exceed input voltage.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status. MSL ratings vary; verify moisture sensitivity requirements for your manufacturing process. Operating temperature range (-40°C to 125°C) is maintained across all primary substitutes.

Frequently Asked Questions (FAQ)

Q: Can the A6214KLKTR-T directly replace the ZXLD1366QDACTC without design changes?

A: The A6214KLKTR-T is functionally equivalent but requires PCB layout modification due to package change from 6-VDFN to 10-SOIC. Electrical specifications are compatible. Verify pinout mapping and thermal management requirements before implementation.

Q: What is the difference between PWM and analog dimming in these LED drivers?

A: PWM (pulse-width modulation) dimming controls LED brightness by varying the duty cycle of the switching signal at constant frequency. Analog dimming adjusts the reference voltage to modulate output current. PWM dimming provides faster response and better efficiency; analog dimming offers smoother dimming curves. The ZXLD1366QDACTC supports PWM only; substitutes with dual capability (PWM and analog) provide design flexibility.

Q: Is the LM3414HVSD/NOPB suitable for automotive applications requiring AEC-Q100 qualification?

A: The LM3414HVSD/NOPB carries automotive-grade classification but AEC-Q100 qualification is not confirmed in the provided specifications. For applications with mandatory AEC-Q100 requirement, use the A6214KLKTR-T or verify qualification status with the manufacturer.

Q: Why does the CAV4201TD-GT3 show "Last Time Buy" product status?

A: Last Time Buy status indicates the manufacturer has announced end-of-life for this part. Existing inventory may be available, but long-term supply is not guaranteed. This part is not recommended for new designs requiring sustained production support.

Q: Can I use the LT3465AES6#TRMPBF as a substitute for the ZXLD1366QDACTC?

A: No. The LT3465AES6#TRMPBF employs step-up (boost) topology, which increases voltage rather than regulating it downward. Input voltage range (2.7V–16V) and output current (225mA switch current) are incompatible with the buck-regulated, 1A output specification of the ZXLD1366QDACTC. Use only if your application requires voltage boost functionality.

Q: What packaging considerations apply when switching from 6-VDFN to alternative packages?

A: Package transitions affect PCB footprint, thermal dissipation, and board space. The 6-VDFN exposed pad provides compact integration; larger packages (10-SOIC, 8-HVSSOP, 16-TSSOP) require increased board area but may offer improved thermal performance. Verify thermal requirements and available PCB space before selecting a substitute with different packaging.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All parts listed maintain ROHS3 compliance and REACH unaffected status, meeting environmental and regulatory requirements for EU and global markets.

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