ZXLD1371QESTTC LED Driver Controller Equivalent & Substitute Parts

Part Overview

The ZXLD1371QESTTC is an active LED driver controller IC manufactured by Diodes Incorporated, designed for DC-DC conversion applications requiring step-down (buck) and step-up (boost) topologies with PWM dimming capability. This 16-TSSOP surface mount device operates across an 8V to 60V supply range and is qualified to AEC-Q100 automotive standards. Substitute parts are identified when packaging constraints, supply availability, or specific application requirements necessitate alternative component selection while maintaining functional compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	ZXLD1371QESTTC
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Type	DC DC Controller
Topology	Step-Down (Buck), Step-Up (Boost)
Package / Case	16-TSSOP (0.173", 4.40mm Width) Exposed Pad
Voltage - Supply (Min)	8V
Voltage - Supply (Max)	60V
Frequency	1MHz
Dimming	PWM
Operating Temperature	-40°C ~ 125°C (TJ)
Grade	Automotive
Qualification	AEC-Q100
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the ZXLD1371QESTTC are categorized based on the following substitution criteria:

Parametric Equivalents maintain identical or near-identical electrical specifications and package form factors. These parts are direct functional replacements with the same topology, supply voltage range, frequency, and dimming capability.

Manufacturer Recommended Alternatives provide functional LED driver control with variations in package type, supply voltage range, frequency, or topology. These parts are suitable when the primary part is unavailable and the application can accommodate the specified parameter differences.

Substitution eligibility is determined by:

Topology compatibility (Step-Down/Step-Up capability)
Supply voltage range overlap with application requirements
Package compatibility with PCB layout constraints
Dimming method compatibility (PWM, Analog, or both)
Operating temperature range suitability
Automotive qualification status where required

Parameter Comparison

Parameter	ZXLD1371QESTTC	ZXLD1370EST16TC	ZXLD1371EST16TC	HVLED002TR	LT8391AHFE#PBF	RT8485GS
Manufacturer	Diodes Inc.	Diodes Inc.	Diodes Inc.	STMicroelectronics	Analog Devices Inc.	Richtek USA Inc.
Type	DC DC Controller	DC DC Controller	DC DC Controller	DC DC Controller	DC DC Controller	DC DC Controller
Topology	Buck, Boost	Buck, Boost	Buck, Boost	—	Buck, Boost	Buck, Boost
Package / Case	16-TSSOP-EP	16-TSSOP-EP	16-TSSOP-EP	8-SOIC	28-TSSOP-EP	14-SOIC
Voltage - Supply (Min)	8V	6V	8V	7V	4V	4.5V
Voltage - Supply (Max)	60V	60V	60V	25V	60V	36V
Frequency	1MHz	1MHz	1MHz	250kHz	600kHz ~ 2MHz	100kHz ~ 1MHz
Dimming	PWM	PWM	PWM	—	Analog, PWM	Analog, PWM
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 150°C	-40°C ~ 150°C	-40°C ~ 125°C
Grade	Automotive	Automotive	Automotive	—	Automotive	—
Qualification	AEC-Q100	AEC-Q100	AEC-Q100	—	AEC-Q100	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Parametric Equivalents (ZXLD1370EST16TC, ZXLD1371EST16TC)

ZXLD1370EST16TC and ZXLD1371EST16TC are parametric equivalents from Diodes Incorporated with identical package form factors and electrical specifications to the primary part. Both maintain AEC-Q100 automotive qualification and ROHS3 compliance. The ZXLD1370EST16TC operates at a minimum supply voltage of 6V compared to 8V for the ZXLD1371QESTTC, providing broader input range compatibility. The ZXLD1371EST16TC matches the 8V minimum specification exactly. These parts differ only in packaging format (Cut Tape & Digi-Reel versus Tape & Reel) and are suitable for direct substitution in automotive LED driver applications.

Manufacturer Recommended Alternatives

LT8391AHFE#PBF (Analog Devices Inc.) maintains buck-boost topology, 1MHz nominal frequency operation, and AEC-Q100 automotive qualification. This 28-TSSOP package provides extended supply voltage range (4V to 60V) and supports both analog and PWM dimming methods. The higher operating temperature range (-40°C to 150°C) accommodates more demanding thermal environments. Package size increase requires PCB layout modification.

RT8485GS (Richtek USA Inc.) provides buck-boost topology with 100kHz to 1MHz frequency range and dual dimming capability (analog and PWM). Supply voltage range is limited to 4.5V to 36V, restricting use in applications requiring the full 60V upper limit. The 14-SOIC package is smaller than the primary part, potentially simplifying board space constraints. This part lacks automotive qualification.

HVLED002TR (STMicroelectronics) operates at 250kHz with a restricted supply voltage range (7V to 25V) and 8-SOIC package. Topology and dimming specifications are not provided. This part is suitable only for applications within the specified voltage window and does not carry automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can ZXLD1370EST16TC replace ZXLD1371QESTTC in all applications?

A: ZXLD1370EST16TC is a parametric equivalent with identical package and electrical specifications except for a lower minimum supply voltage (6V versus 8V). It is suitable for direct substitution in applications operating within the 8V to 60V range. The lower minimum voltage provides additional flexibility for lower-input applications.

Q: What are the key differences between the Diodes Incorporated parametric equivalents?

A: ZXLD1370EST16TC and ZXLD1371EST16TC differ only in minimum supply voltage specification (6V and 8V respectively) and packaging format (Cut Tape & Digi-Reel versus Tape & Reel). Both maintain identical 16-TSSOP package geometry, 1MHz frequency, PWM dimming, and AEC-Q100 qualification. Selection depends on supply voltage requirements and packaging availability.

Q: Is LT8391AHFE#PBF suitable for automotive applications?

A: LT8391AHFE#PBF carries AEC-Q100 automotive qualification and is suitable for automotive LED driver applications. The 28-TSSOP package is larger than the primary part and requires PCB layout modification. Extended operating temperature range (-40°C to 150°C) and broader supply voltage range (4V to 60V) provide additional design flexibility.

Q: What packaging constraints should be considered when selecting substitutes?

A: The primary part uses 16-TSSOP-EP package. ZXLD1370EST16TC and ZXLD1371EST16TC maintain identical package geometry and are direct physical replacements. LT8391AHFE#PBF uses 28-TSSOP-EP (larger footprint), RT8485GS uses 14-SOIC (smaller footprint), and HVLED002TR uses 8-SOIC (smallest footprint). Package selection must align with PCB layout constraints and thermal management requirements.

Q: Can RT8485GS be used in applications requiring 60V supply voltage?

A: No. RT8485GS maximum supply voltage is 36V, which is insufficient for applications requiring the full 60V range supported by ZXLD1371QESTTC. This part is suitable only for applications operating within the 4.5V to 36V window.

Q: What is the significance of AEC-Q100 qualification?

A: AEC-Q100 qualification indicates the component meets automotive industry reliability and quality standards. ZXLD1371QESTTC, ZXLD1370EST16TC, ZXLD1371EST16TC, and LT8391AHFE#PBF carry this qualification. RT8485GS and HVLED002TR do not. For automotive applications, AEC-Q100 qualified parts are required.

Q: How does dimming capability affect part selection?

A: ZXLD1371QESTTC supports PWM dimming only. LT8391AHFE#PBF and RT8485GS support both analog and PWM dimming, providing additional design flexibility. HVLED002TR dimming capability is not specified. Application requirements determine whether dual-mode dimming is necessary.

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