AL8400QSE-7 Equivalent & Substitute Parts

Part Overview

The AL8400QSE-7 is a linear LED driver IC manufactured by Diodes Incorporated, designed for single-output LED applications in signage and lighting systems. This surface-mount device operates across a 2.2V to 18V supply range and is qualified to AEC-Q100 automotive standards. The part is currently active in production with 15,100 units in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges.

Key Parameters

Parameter	AL8400QSE-7 Specification
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Type	Linear
Number of Outputs	1
Voltage - Supply (Min)	2.2V
Voltage - Supply (Max)	18V
Voltage - Output	0.2V ~ 18V
Internal Switch(s)	No
Package / Case	5-TSSOP, SC-70-5, SOT-353
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 125°C (TA)
Grade	Automotive
Qualification	AEC-Q100
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the AL8400QSE-7 are classified based on the following substitution criteria:

Parametric Equivalents maintain identical or overlapping electrical specifications and package compatibility:

Single output configuration
Linear topology without internal switching
Supply voltage range compatibility (minimum 2.2V, maximum 18V)
Surface-mount packaging in SOT-353 or equivalent footprint
Operating temperature range -40°C to 125°C or better
Active product status with ROHS3 compliance

Manufacturer-Recommended Alternatives provide functional equivalence with allowable variations in:

Internal switch presence (permitted for higher current applications)
Package form factor (different surface-mount or through-hole options)
Supply voltage range (may exceed the original specification)
Output current capability (higher ratings acceptable for same application class)
Operating temperature range (extended ranges acceptable)

All substitute parts maintain single-output LED driver functionality, automotive-grade qualification where specified, and ROHS3 compliance.

Parameter Comparison

Parameter	AL8400QSE-7	AL8400SE-7	LM3466TA/NOPB	NCR401UX	R2A20134SP#W5	TL4242DRJR
Manufacturer	Diodes Inc.	Diodes Inc.	Texas Instruments	Nexperia USA Inc.	Renesas Electronics	Texas Instruments
Type	Linear	Linear	Linear	Linear	Linear	Linear
Number of Outputs	1	1	1	1	1	1
Voltage - Supply (Min)	2.2V	2.2V	6V	—	8.5V	4.5V
Voltage - Supply (Max)	18V	18V	70V	40V	24V	42V
Internal Switch(s)	No	No	Yes	Yes	No	Yes
Package / Case	5-TSSOP, SOT-353	5-TSSOP, SOT-353	TO-220-7	SC-74, SOT-457	8-SOIC	8-WDFN
Mounting Type	Surface Mount	Surface Mount	Through Hole	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TJ)	-55°C ~ 150°C (TA)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)
Grade	Automotive	Automotive	—	Automotive	—	—
Qualification	AEC-Q100	AEC-Q100	—	AEC-Q101	—	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active
Inventory	15,100 Pcs	33,400 Pcs	1,365 Pcs	17,012 Pcs	1,345 Pcs	35,300 Pcs

Engineering Selection Recommendations

AL8400SE-7 (Diodes Incorporated) is the primary parametric equivalent. This part maintains identical electrical specifications, package form factor (SOT-353), and automotive qualification (AEC-Q100). Supply voltage range, output voltage range, and operating temperature specifications are identical. Higher inventory availability (33,400 units) supports production continuity.

TL4242DRJR (Texas Instruments) provides the highest inventory availability (35,300 units) among alternatives. This part accommodates higher supply voltages (4.5V to 42V) and includes internal switching capability with 500mA output current. Package differs (8-WDFN vs. SOT-353), requiring PCB layout modification. Product status is active with ROHS3 compliance.

NCR401UX (Nexperia USA Inc.) offers automotive qualification (AEC-Q101) with extended operating temperature range (-55°C to 150°C). This part includes internal switching and operates to 40V maximum supply. Package is SC-74 (SOT-457), requiring footprint change. Inventory is 17,012 units.

R2A20134SP#W5 (Renesas Electronics Corporation) operates within 8.5V to 24V supply range, overlapping the upper portion of the AL8400QSE-7 specification. Package is 8-SOIC, requiring PCB redesign. Inventory is limited (1,345 units). No internal switch.

LM3466TA/NOPB (Texas Instruments) operates at higher supply voltages (6V to 70V) with internal switching and 1.5A output current capability. Package is through-hole (TO-220-7), suitable only for applications permitting through-hole mounting. Inventory is 1,365 units. No automotive grade specified.

Frequently Asked Questions (FAQ)

Q: Can AL8400SE-7 be used as a direct replacement for AL8400QSE-7?

A: Yes. AL8400SE-7 maintains identical electrical specifications, package form factor (SOT-353), supply voltage range (2.2V to 18V), output voltage range (0.2V to 18V), and automotive qualification (AEC-Q100). No circuit modification is required.

Q: What are the key differences between AL8400QSE-7 and TL4242DRJR?

A: TL4242DRJR includes an internal switch (AL8400QSE-7 does not), supports higher supply voltages (4.5V to 42V vs. 2.2V to 18V), and provides 500mA output current. Package differs (8-WDFN vs. SOT-353), requiring PCB layout changes. TL4242DRJR lacks automotive qualification.

Q: Is NCR401UX suitable for automotive applications?

A: NCR401UX carries AEC-Q101 qualification and automotive grade designation. However, it operates to a maximum supply voltage of 40V and includes internal switching, differing from the AL8400QSE-7 specification. Package is SC-74 (SOT-457), not SOT-353.

Q: Why does LM3466TA/NOPB have a through-hole package?

A: LM3466TA/NOPB is packaged in TO-220-7 for through-hole mounting, suitable for applications requiring higher thermal dissipation or through-hole assembly processes. This package type is incompatible with surface-mount PCB designs using SOT-353 footprints.

Q: What inventory considerations apply to substitute selection?

A: AL8400SE-7 offers the highest inventory (33,400 units) among parametric equivalents. TL4242DRJR provides 35,300 units but requires package redesign. R2A20134SP#W5 and LM3466TA/NOPB have limited availability (1,345 and 1,365 units respectively), affecting lead time and production planning.

Q: Can parts with internal switches replace the AL8400QSE-7 in existing designs?

A: Parts with internal switches (TL4242DRJR, LM3466TA/NOPB, NCR401UX) provide functional LED driver capability but require circuit evaluation. Internal switching changes current handling characteristics and may affect thermal management, dimming control, and protection circuit design. PCB layout and component selection must be re-evaluated.

Q: What is the significance of the SOT-353 package specification?

A: SOT-353 (5-TSSOP, SC-70-5) is a small-outline surface-mount package. AL8400SE-7 maintains this package, enabling direct PCB footprint compatibility. Substitute parts with different packages (8-SOIC, 8-WDFN, SC-74, TO-220-7) require PCB redesign and cannot be used as drop-in replacements.

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