KA2903DTF Equivalent & Substitute Parts

Part Overview

The KA2903DTF is a differential comparator IC manufactured by onsemi, housed in an 8-SOIC surface-mount package. This device is classified as obsolete, with 7,382 units currently in stock. The KA2903DTF features dual differential comparator elements designed for general-purpose signal comparison applications across a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply).

Due to its obsolete product status, sourcing alternatives becomes necessary for new designs or long-term production continuity. Substitute parts must maintain electrical compatibility across key parameters including supply voltage range, input offset voltage, input bias current, output current capability, and operating temperature range, while accommodating the 8-SOIC package form factor.

Key Parameters

Parameter	KA2903DTF Value	Unit
Type	Differential	—
Number of Elements	2	—
Voltage - Supply, Single/Dual (±)	2V ~ 36V, ±1V ~ 18V	V
Voltage - Input Offset (Max)	7mV @ 5V	mV
Current - Input Bias (Max)	0.25µA @ 5V	µA
Current - Output (Typ)	16mA @ 5V	mA
Current - Quiescent (Max)	2.5mA	mA
Operating Temperature	-40°C ~ 85°C	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the KA2903DTF are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution logic is determined by the following parameters:

Critical Compatibility Parameters:

Supply voltage range: Must support 2V ~ 36V (single) or ±1V ~ 18V (dual)
Input offset voltage: Maximum 7mV @ 5V or better
Input bias current: Maximum 0.25µA @ 5V
Output current: Minimum 16mA @ 5V
Quiescent current: Maximum 2.5mA
Package: 8-SOIC form factor with 0.154" (3.90mm) width
Mounting: Surface mount
Compliance: ROHS3 compliant

Substitution Categories:

Category 1: Direct Electrical Equivalents (onsemi LM2903 Series) Parts LM2903DR2G, LM2903VDR2G, and LM2903M maintain full electrical compatibility with the KA2903DTF across all critical parameters. These general-purpose comparators feature identical supply voltage ranges, input/output specifications, and package dimensions. LM2903DR2G and LM2903VDR2G are active products with extended temperature ranges (-40°C to 105°C and -40°C to 125°C respectively), while LM2903M is a Last Time Buy offering from Texas Instruments.

Category 2: Compatible General-Purpose Comparators (onsemi LM293/LM393 Series) Parts LM293DR2G and LM393DR2G are general-purpose comparators with improved input offset voltage specifications (5mV @ 30V) compared to the KA2903DTF. Both maintain the required supply voltage range, output current, and quiescent current specifications. Operating temperature ranges differ: LM293DR2G operates -25°C to 85°C, while LM393DR2G operates 0°C to 70°C.

Category 3: Automotive-Grade Alternative (onsemi NCV2903DR2G) The NCV2903DR2G is an automotive-qualified comparator (AEC-Q100) with extended temperature range (-40°C to 125°C) and specified propagation delay (1.3µs). It maintains all electrical compatibility parameters with the KA2903DTF and offers enhanced reliability for automotive applications.

Category 4: Alternative Manufacturers (UMW, Rohm Semiconductor) The UMW LM2903DR and Rohm BA10393F-E2, BA2903SF-E2, and BA2903YF-CE2 provide functional equivalence with package variations. The UMW part uses 8-SOP packaging and operates 0°C to 70°C. Rohm parts feature 8-SOP packaging with 0.173" (4.40mm) width and lower quiescent current (1mA). The BA2903YF-CE2 includes automotive qualification (AEC-Q100) with -40°C to 125°C operating range.

Parameter Comparison

Part Number	Manufacturer	Product Status	Supply Voltage (V)	Input Offset Max (mV)	Input Bias Max (µA)	Output Current (mA)	Quiescent Max (mA)	Temp Range (°C)	Package
KA2903DTF	onsemi	Obsolete	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	2.5	-40 to 85	8-SOIC (3.90mm)
LM2903DR2G	onsemi	Active	2-36, ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 to 105	8-SOIC (3.90mm)
LM2903VDR2G	onsemi	Active	2-36, ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 to 125	8-SOIC (3.90mm)
LM293DR2G	onsemi	Active	2-36, ±1-18	5 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-25 to 85	8-SOIC (3.90mm)
LM393DR2G	onsemi	Active	2-36, ±1-18	5 @ 30V	0.25 @ 5V	16 @ 5V	2.5	0 to 70	8-SOIC (3.90mm)
NCV2903DR2G	onsemi	Active	2-36, ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 to 125	8-SOIC (3.90mm)
LM2903DR	UMW	Active	2-30, ±1-15	5 @ 5V	0.25 @ 5V	16 @ 5V	2.5	0 to 70	8-SOP (3.90mm)
LM2903M	Texas Instruments	Last Time Buy	2-36, ±1-18	7 @ 30V	0.25 @ 5V	16 @ 5V	2.5	-40 to 85	8-SOIC (3.90mm)
BA10393F-E2	Rohm Semiconductor	Active	2-36, ±1-18	5 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 to 85	8-SOP (4.40mm)
BA2903SF-E2	Rohm Semiconductor	Active	2-36, ±1-18	7 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 to 105	8-SOP (4.40mm)
BA2903YF-CE2	Rohm Semiconductor	Active	2-36, ±1-18	4 @ 5V	0.25 @ 5V	16 @ 5V	1	-40 to 125	8-SOP (4.40mm)

Engineering Selection Recommendations

For Direct Replacement (Active Product Status): LM2903DR2G is the primary recommended substitute. It is an active onsemi product maintaining identical electrical specifications and 8-SOIC package dimensions to the KA2903DTF. The extended operating temperature range (-40°C to 105°C) provides improved thermal margin over the obsolete KA2903DTF (-40°C to 85°C). Both parts are ROHS3 compliant with identical supply voltage and current specifications.

For Extended Temperature Applications: LM2903VDR2G extends the operating range to -40°C to 125°C while maintaining all electrical compatibility parameters. This part is suitable for applications requiring enhanced thermal performance beyond standard industrial specifications.

For Automotive Applications: NCV2903DR2G and BA2903YF-CE2 are both AEC-Q100 qualified automotive-grade comparators. NCV2903DR2G maintains the 8-SOIC package form factor with -40°C to 125°C operation. BA2903YF-CE2 offers the same temperature range with lower quiescent current (1mA) but uses 8-SOP packaging with different physical dimensions (4.40mm width).

For Improved Input Offset Voltage: LM293DR2G and LM393DR2G both specify 5mV input offset voltage at 30V, compared to 7mV for the KA2903DTF. LM293DR2G operates -25°C to 85°C, while LM393DR2G operates 0°C to 70°C. Both maintain the 8-SOIC package and all other electrical specifications.

For Lower Quiescent Current: Rohm BA10393F-E2, BA2903SF-E2, and BA2903YF-CE2 reduce quiescent current to 1mA (versus 2.5mA for KA2903DTF). These parts use 8-SOP packaging with 4.40mm width, requiring PCB layout verification for mechanical compatibility.

For Supply Voltage Constraints: UMW LM2903DR operates with reduced maximum supply voltage (2V to 30V single, ±1V to ±15V dual) compared to the KA2903DTF (2V to 36V, ±1V to 18V). This part is suitable only for applications within these reduced voltage limits and operates 0°C to 70°C.

Frequently Asked Questions (FAQ)

Q: Can LM2903DR2G directly replace KA2903DTF without PCB modifications? A: Yes. LM2903DR2G maintains identical electrical specifications and 8-SOIC package dimensions (0.154" width, 3.90mm). No circuit modifications are required. Both parts are ROHS3 compliant and support the same supply voltage range (2V-36V single, ±1V-18V dual).

Q: What is the difference between onsemi LM2903 and LM293 series comparators? A: Both are dual comparators in 8-SOIC packages with identical supply voltage ranges and output current specifications. LM293 series specifies lower input offset voltage (5mV @ 30V) compared to LM2903 (7mV @ 30V). Operating temperature ranges differ: LM293DR2G operates -25°C to 85°C, while LM2903DR2G operates -40°C to 105°C.

Q: Are Rohm BA2903 parts compatible with KA2903DTF? A: Rohm BA2903SF-E2 and BA2903YF-CE2 are electrically compatible with KA2903DTF across all critical parameters (supply voltage, input/output currents, quiescent current). However, they use 8-SOP packaging with 4.40mm width instead of 3.90mm, requiring PCB footprint verification. Quiescent current is reduced to 1mA.

Q: What is the significance of AEC-Q100 qualification? A: AEC-Q100 qualification indicates the part meets automotive industry reliability standards. NCV2903DR2G and BA2903YF-CE2 are both AEC-Q100 qualified, making them suitable for automotive applications requiring enhanced reliability and temperature cycling performance.

Q: Can I use LM393DR2G in place of KA2903DTF? A: LM393DR2G is electrically compatible with KA2903DTF for supply voltage, input/output current, and quiescent current specifications. However, its operating temperature range is limited to 0°C to 70°C, compared to KA2903DTF's -40°C to 85°C. Use LM393DR2G only if your application operates within 0°C to 70°C.

Q: What are the package differences between 8-SOIC and 8-SOP? A: Both are 8-pin surface-mount packages. The primary difference is body width: 8-SOIC (KA2903DTF, LM2903DR2G) is 0.154" (3.90mm) wide, while 8-SOP (Rohm parts) is 0.173" (4.40mm) wide. Pin pitch and lead configuration differ, requiring separate PCB footprints. Verify PCB layout compatibility before substitution.

Q: Is LM2903M from Texas Instruments still available? A: LM2903M is classified as Last Time Buy, indicating Texas Instruments has discontinued production. While 27,883 units are currently in stock, this part should not be selected for new designs. LM2903DR2G (onsemi, active status) is the recommended alternative.

Q: What is the propagation delay specification for KA2903DTF? A: Propagation delay is not specified in the KA2903DTF datasheet. NCV2903DR2G specifies 1.3µs propagation delay. If propagation delay is critical for your application, verify timing requirements against available substitute datasheets.

Q: Can I substitute UMW LM2903DR for applications requiring ±18V dual supply? A: No. UMW LM2903DR supports maximum ±15V dual supply, while KA2903DTF supports ±18V. Use UMW LM2903DR only for applications within ±15V dual supply limits. For ±18V operation, select onsemi or Rohm alternatives.

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