SN74LS245DWG4 Equivalent & Substitute Parts

Part Overview

The SN74LS245DWG4 is a non-inverting transceiver logic IC manufactured by Texas Instruments, designed for 8-bit data bus applications with 3-state output capability. This component operates within a 4.75V to 5.25V supply voltage range and is housed in a 20-SOIC package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance, repairs, and legacy design support.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74LS245DWG4
Manufacturer	Texas Instruments
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	15mA, 24mA
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN74LS245DWG4 are classified based on strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Logic Type: Transceiver, Non-Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Current - Output High, Low: 15mA, 24mA
Voltage - Supply: 4.75V ~ 5.25V
Operating Temperature: 0°C ~ 70°C (TA)
Mounting Type: Surface Mount
Base Product Number: 74LS series

Package Considerations: Substitutes may differ in package type (SOIC vs. SSOP) while maintaining electrical equivalence. Package selection depends on PCB layout and footprint compatibility.

Parameter Comparison

Parameter	SN74LS245DWG4 (Main)	SN74LS245DBR	SN74LS245DW	SN74LS645DW
Manufacturer	Texas Instruments	Texas Instruments	onsemi	Texas Instruments
Logic Type	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting
Number of Elements	1	1	1	1
Number of Bits per Element	8	8	8	8
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	15mA, 24mA	15mA, 24mA	15mA, 24mA	15mA, 24mA
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)	20-SSOP (0.209", 5.30mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Obsolete	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Not specified	1 (Unlimited)

Engineering Selection Recommendations

SN74LS245DBR (MFR Recommended) This part is the manufacturer-recommended substitute. It maintains full electrical equivalence with identical output current specifications and supply voltage range. The primary difference is the package format: 20-SSOP versus 20-SOIC. SN74LS245DBR holds Active product status and ROHS3 compliance, making it suitable for new designs and long-term availability. Selection of this part requires PCB footprint compatibility with the 20-SSOP package (0.209", 5.30mm Width).

SN74LS245DW (Parametric Equivalent) This onsemi-manufactured part provides full electrical equivalence in the same 20-SOIC package as the original SN74LS245DWG4. However, it carries Obsolete product status and RoHS non-compliance. This part is suitable only for direct replacement in existing systems where package footprint compatibility is critical and RoHS compliance is not a requirement.

SN74LS645DW (Parametric Equivalent) This Texas Instruments part maintains electrical equivalence and ROHS3 compliance in the 20-SOIC package. It is classified as Last Time Buy, indicating limited future availability. This part is appropriate for legacy system repairs where package footprint must match the original SN74LS245DWG4 and compliance requirements align with ROHS3 standards.

Frequently Asked Questions (FAQ)

Q: Can SN74LS245DBR be used as a direct replacement for SN74LS245DWG4? A: SN74LS245DBR is electrically equivalent and maintains all critical functional parameters. However, it uses a 20-SSOP package instead of 20-SOIC. Direct PCB substitution requires footprint compatibility. If the PCB is designed for 20-SOIC, a package adapter or PCB redesign is necessary.

Q: What is the difference between 20-SOIC and 20-SSOP packages? A: Both are surface-mount packages with 20 pins. The 20-SOIC package is 0.295" wide (7.50mm), while the 20-SSOP package is 0.209" wide (5.30mm). The SSOP is more compact. Pin pitch and spacing differ, requiring different PCB footprints.

Q: Why is SN74LS245DW marked as RoHS non-compliant? A: RoHS compliance status is determined by the manufacturer and production date. The onsemi SN74LS245DW was manufactured before or outside RoHS3 compliance requirements. If RoHS compliance is mandatory for your application, select SN74LS245DBR or SN74LS645DW instead.

Q: Is SN74LS645DW a suitable long-term replacement? A: SN74LS645DW is electrically equivalent and ROHS3 compliant, but carries Last Time Buy status. This indicates the manufacturer will discontinue production. It is suitable for immediate repairs but not recommended for new designs requiring long-term component availability.

Q: What does "3-State Output" mean in the context of these transceivers? A: 3-State output refers to three possible output conditions: logic high, logic low, and high-impedance (disabled). This allows multiple devices to share a common bus without contention when their outputs are disabled.

Q: Are all substitute parts pin-compatible with the original SN74LS245DWG4? A: All listed substitutes maintain identical pin counts (20 pins) and pin assignments for the 74LS245 logic function. However, package physical dimensions differ between SOIC and SSOP variants, affecting PCB layout compatibility.

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