ALD2303ASAL Equivalent & Substitute Parts

Part Overview

The ALD2303ASAL is a general-purpose dual comparator IC manufactured by Advanced Linear Devices Inc., packaged in 8-SOIC surface-mount configuration. This device operates across supply voltage ranges of 3V to 10V (single supply) or ±1.5V to ±5V (dual supply), with CMOS, NMOS, open-drain, and TTL output types. The part is currently active in production with 947 units in stock.

Substitute parts are necessary when the ALD2303ASAL becomes unavailable, reaches end-of-life status, or when design requirements necessitate alternative electrical characteristics such as extended temperature ranges, improved propagation delay, or enhanced input bias current specifications.

Key Parameters

Parameter	ALD2303ASAL Value	Unit
Package Type	8-SOIC (0.154", 3.90mm Width)	-
Mounting Type	Surface Mount	-
Number of Elements	2	-
Output Type	CMOS, NMOS, Open-Drain, TTL	-
Voltage Supply (Single)	3V ~ 10V	V
Voltage Supply (Dual)	±1.5V ~ ±5V	V
Input Offset Voltage (Max)	1	mV @ 5V
Input Bias Current (Max)	0.001	µA @ 5V
Output Current (Typ)	60	mA
Quiescent Current (Max)	40	µA
Operating Temperature	0°C ~ 70°C	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution compatibility for the ALD2303ASAL is determined by the following critical parameters:

Package and Mounting Compatibility: All substitute parts must use the 8-SOIC package with surface-mount configuration to ensure direct PCB footprint compatibility.

Functional Equivalence: All substitutes must provide dual comparator functionality with general-purpose application capability.

Output Type Compatibility: Substitute parts must support at least CMOS and open-drain output types to maintain circuit interface compatibility.

Supply Voltage Range: Substitute parts must operate within overlapping supply voltage ranges. The ALD2303ASAL operates at 3V to 10V (single) or ±1.5V to ±5V (dual). Substitutes with narrower ranges (such as 2.5V to 5.5V) are compatible for applications operating within the intersection of these ranges.

Electrical Performance: Input offset voltage, input bias current, and quiescent current specifications determine functional equivalence. Substitutes with equal or superior (lower) specifications maintain or improve circuit performance.

Compliance and Status: All substitute parts must maintain ROHS3 compliance and MSL 1 rating to ensure manufacturing and environmental compatibility.

The substitute parts are grouped into two categories based on product status: active production parts (MAX990ESA+, MAX992ESA+, MAX992ESA+T, TLV3402IDR) and last-time-buy or obsolete parts (TLV2302IDR, TLV2302ID, TLV3402CD, TLV3402CDR, TLV3402ID).

Parameter Comparison

Parameter	ALD2303ASAL	MAX990ESA+	MAX992ESA+	MAX992ESA+T	TLV2302IDR	TLV3402IDR
Manufacturer	Advanced Linear Devices Inc.	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Texas Instruments	Texas Instruments
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Number of Elements	2	2	2	2	2	2
Output Type	CMOS, NMOS, Open-Drain, TTL	CMOS, Open-Drain, Rail-to-Rail, TTL	CMOS, Open-Drain, Rail-to-Rail, TTL	CMOS, Open-Drain, Rail-to-Rail, TTL	Amplifier, Comparator	CMOS, Open-Drain
Supply Voltage (Single)	3V ~ 10V	2.5V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V	-	2.7V ~ 16V
Supply Voltage (Dual)	±1.5V ~ ±5V	±1.25V ~ ±2.75V	±1.25V ~ ±2.75V	±1.25V ~ ±2.75V	-	±1.35V ~ ±8V
Input Offset Voltage (Max)	1 mV @ 5V	5 mV @ 5.5V	5 mV @ 5.5V	5 mV @ 5.5V	-	3.6 mV @ 15V
Input Bias Current (Max)	0.001 µA @ 5V	1 pA @ 5.5V	1 pA @ 5.5V	1 pA @ 5.5V	-	250 pA @ 15V
Output Current (Typ)	60 mA	-	-	-	-	10 mA
Quiescent Current (Max)	40 µA	24 µA	96 µA	96 µA	-	950 nA
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Last Time Buy	Active

Engineering Selection Recommendations

Primary Substitutes (Active Production Status):

The MAX992ESA+T and MAX992ESA+ (Analog Devices Inc./Maxim Integrated) are the preferred substitutes for the ALD2303ASAL. Both parts maintain active production status, ROHS3 compliance, and MSL 1 rating. The MAX992ESA+T is supplied in tape and reel packaging, while MAX992ESA+ is supplied in tube packaging. These parts provide improved propagation delay (210ns) compared to the ALD2303ASAL and support extended operating temperature ranges (-40°C to 85°C). The supply voltage range of 2.5V to 5.5V (single) or ±1.25V to ±2.75V (dual) is compatible with applications operating within the 3V to 10V range of the original part.

The MAX990ESA+ (Analog Devices Inc./Maxim Integrated) is an alternative active production substitute with lower quiescent current (24µA) and superior input bias current specification (1pA). This part is suitable for low-power applications. The narrower supply voltage range (2.5V to 5.5V single, ±1.25V to ±2.75V dual) requires verification for applications requiring the full 3V to 10V range of the ALD2303ASAL.

The TLV3402IDR (Texas Instruments) is an active production substitute with the widest supply voltage range (2.7V to 16V single, ±1.35V to ±8V dual), providing maximum flexibility for applications with varying supply requirements. This part features the lowest quiescent current (950nA) and superior CMRR/PSRR specifications (88dB/105dB). The TLV3402IDR is supplied in tape and reel packaging with 27,578 units in stock, providing high availability.

Secondary Substitutes (Last Time Buy / Obsolete Status):

The TLV2302IDR (Texas Instruments) is designated as last-time-buy and should be used only when existing inventory is available or when design requirements specifically necessitate this part. The TLV3402CD and TLV3402CDR are obsolete parts and should not be selected for new designs. The TLV3402ID is designated as last-time-buy.

Compliance and Regulatory Considerations:

All recommended substitutes maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage processes. All parts carry EAR99 ECCN classification and are REACH unaffected, maintaining regulatory equivalence with the original ALD2303ASAL.

Frequently Asked Questions (FAQ)

Q: Can the MAX992ESA+ directly replace the ALD2303ASAL in all applications?

A: The MAX992ESA+ is mechanically and functionally compatible for applications operating within the overlapping supply voltage range (2.5V to 5.5V). Applications requiring the full 3V to 10V range of the ALD2303ASAL must verify that the MAX992ESA+ supply range is sufficient. The MAX992ESA+ provides improved propagation delay and extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), which may benefit circuit performance.

Q: What is the difference between MAX992ESA+ and MAX992ESA+T?

A: Both parts are electrically identical. The primary difference is packaging: MAX992ESA+ is supplied in tube packaging, while MAX992ESA+T is supplied in tape and reel (TR) format. Selection depends on manufacturing process requirements and volume needs.

Q: Why is the TLV3402IDR recommended despite having lower output current (10mA versus 60mA)?

A: The TLV3402IDR is recommended for applications where the lower output current is acceptable. For applications requiring 60mA output current, the MAX992ESA+ or MAX990ESA+ are more appropriate selections. The TLV3402IDR offers advantages in supply voltage range flexibility (2.7V to 16V) and extremely low quiescent current (950nA), making it suitable for battery-powered or wide-range supply applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (unlimited) rating, ensuring compatibility with standard manufacturing processes and environmental requirements.

Q: What is the impact of different input offset voltage specifications?

A: The ALD2303ASAL specifies 1mV input offset voltage at 5V. Substitute parts with higher input offset voltage (such as MAX992ESA+ at 5mV or TLV3402IDR at 3.6mV) may require circuit design adjustments for precision applications. Applications with relaxed offset voltage tolerance can accommodate these variations without modification.

Q: Can the TLV2302IDR be used for new designs?

A: The TLV2302IDR is designated as last-time-buy status. While it remains available in inventory (1,618 units), it should not be selected for new designs. Active production alternatives such as MAX992ESA+T, MAX992ESA+, MAX990ESA+, or TLV3402IDR are recommended for new designs to ensure long-term supply availability.

Q: What is the significance of the extended operating temperature range in TLV3402IDR (-40°C to 125°C)?

A: The TLV3402IDR supports a wider operating temperature range (-40°C to 125°C) compared to the ALD2303ASAL (0°C to 70°C). This extended range is beneficial for industrial, automotive, or extreme-environment applications. Applications operating within the standard 0°C to 70°C range do not require this extended capability.

Q: How do CMRR and PSRR specifications affect substitution?

A: The ALD2303ASAL does not specify CMRR or PSRR values. Substitute parts with specified CMRR and PSRR (such as MAX990ESA+ and MAX992ESA+ at 80dB, or TLV3402IDR at 88dB/105dB) provide documented common-mode and power-supply rejection performance. These specifications are beneficial for noise-sensitive applications but do not affect basic functional compatibility.

Q: Is the 8-SOIC package identical across all substitute parts?

A: Yes. All substitute parts use the 8-SOIC package with 0.154" (3.90mm) width, ensuring identical PCB footprint compatibility. Surface-mount assembly processes and reflow profiles remain unchanged.

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