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74LCX573WM Equivalent & Substitute Parts
Part Overview
The 74LCX573WM is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring 1 channel with 8:8 circuit configuration and tri-state output capability. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and production continuity. The 74LCX573WM operates across a 2V to 3.6V supply voltage range with 1.5ns propagation delay and 24mA output drive capability in both high and low states.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74LCX573WM |
| Manufacturer | onsemi |
| Logic Type | D-Type Transparent Latch |
| Circuit Configuration | 8:8 |
| Output Type | Tri-State |
| Voltage Supply Range | 2V ~ 3.6V |
| Independent Circuits | 1 |
| Propagation Delay | 1.5ns |
| Output Current (High/Low) | 24mA / 24mA |
| Operating Temperature | -40°C ~ 85°C |
| Package Type | 20-SOIC (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution eligibility for the 74LCX573WM is determined by the following critical parameters: logic type (D-Type Transparent Latch), circuit configuration (8:8), output type (tri-state), package type (20-SOIC), and mounting type (surface mount). All substitute parts must maintain identical functional specifications in these core areas.
The voltage supply range, propagation delay, and output current specifications define the operational envelope within which substitutes must function. Parts are grouped into three categories based on their relationship to the original specification:
Direct Substitutes maintain all electrical parameters within the original 74LCX573WM specification range and are pin-compatible.
Upgrade Substitutes offer extended operating temperature ranges or improved product status (active vs. obsolete) while maintaining electrical compatibility.
Similar Substitutes share the same base product number and functional characteristics but may have variations in voltage supply range, propagation delay, or operating temperature that require design verification.
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Circuit | Output Type | Voltage Supply | Propagation Delay | Output Current (H/L) | Operating Temp | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 74LCX573WM | onsemi | D-Type Transparent Latch | 8:8 | Tri-State | 2V ~ 3.6V | 1.5ns | 24mA / 24mA | -40°C ~ 85°C | 20-SOIC | Obsolete | Not Specified |
| MC74LCX573DWG | onsemi | D-Type Transparent Latch | 8:8 | Tri-State | 2V ~ 3.6V | 1.5ns | 24mA / 24mA | -55°C ~ 125°C | 20-SOIC | Active | ROHS3 Compliant |
| MC74LCX573DWR2G | onsemi | D-Type Transparent Latch | 8:8 | Tri-State | 2V ~ 3.6V | 1.5ns | 24mA / 24mA | -55°C ~ 125°C | 20-SOIC | Active | ROHS3 Compliant |
| 74LVC573AD,112 | Nexperia USA Inc. | D-Type Transparent Latch | 8:8 | Tri-State | 1.2V ~ 3.6V | 1.5ns | 24mA / 24mA | -40°C ~ 125°C | 20-SOIC | Obsolete | ROHS3 Compliant |
| 74LVC573AD,118 | Nexperia USA Inc. | D-Type Transparent Latch | 8:8 | Tri-State | 1.2V ~ 3.6V | 1.5ns | 24mA / 24mA | -40°C ~ 125°C | 20-SOIC | Active | ROHS3 Compliant |
| 74LVC573AD-Q100J | Nexperia USA Inc. | D-Type Transparent Latch | 8:8 | Tri-State | 1.2V ~ 3.6V | 1.5ns | 24mA / 24mA | -40°C ~ 125°C | 20-SOIC | Active | ROHS3 Compliant |
| SN74LVC573ADW | Texas Instruments | D-Type Transparent Latch | 8:8 | Tri-State | 1.65V ~ 3.6V | 2ns | 24mA / 24mA | -40°C ~ 85°C | 20-SOIC | Active | ROHS3 Compliant |
| SN74LVC573ADWR | Texas Instruments | D-Type Transparent Latch | 8:8 | Tri-State | 1.65V ~ 3.6V | 2ns | 24mA / 24mA | -40°C ~ 85°C | 20-SOIC | Active | ROHS3 Compliant |
| SN74LVC573ANS | Texas Instruments | D-Type Transparent Latch | 8:8 | Tri-State | 1.65V ~ 3.6V | 2ns | 24mA / 24mA | -40°C ~ 125°C | 20-SOIC | Active | ROHS3 Compliant |
| SN74LVC573ANSR | Texas Instruments | D-Type Transparent Latch | 8:8 | Tri-State | 1.65V ~ 3.6V | 2ns | 24mA / 24mA | -40°C ~ 85°C | 20-SOIC | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation: MC74LCX573DWR2G (onsemi)
The MC74LCX573DWR2G is the optimal replacement for the obsolete 74LCX573WM. This part maintains identical electrical specifications (2V to 3.6V supply, 1.5ns propagation delay, 24mA output drive) while offering active product status and ROHS3 compliance. The extended operating temperature range (-55°C to 125°C) provides superior thermal performance compared to the original specification. Tape & Reel packaging supports high-volume production requirements.
Secondary Recommendation: MC74LCX573DWG (onsemi)
The MC74LCX573DWG provides equivalent electrical performance to the MC74LCX573DWR2G with identical supply voltage and propagation delay specifications. This variant is available in Tube packaging and maintains active product status with ROHS3 compliance. Selection between MC74LCX573DWG and MC74LCX573DWR2G depends on packaging requirements and volume considerations.
Alternative Options: 74LVC573AD,118 (Nexperia) and SN74LVC573ANS (Texas Instruments)
The 74LVC573AD,118 and SN74LVC573ANS represent functionally compatible alternatives from alternative manufacturers. Both parts maintain the 8:8 circuit configuration and tri-state output with identical propagation delay and output current specifications. The 74LVC573AD,118 offers extended operating temperature range (-40°C to 125°C) and active product status. The SN74LVC573ANS provides the same temperature range with active status. Both are ROHS3 compliant.
Design Consideration: Voltage Supply Range Variation
Texas Instruments variants (SN74LVC573 series) specify a minimum supply voltage of 1.65V compared to 2V for onsemi and Nexperia parts. This represents a tighter voltage tolerance requirement and may necessitate circuit-level verification if the original design operates near the 2V minimum threshold.
Design Consideration: Propagation Delay Variation
Texas Instruments variants specify 2ns propagation delay compared to 1.5ns for onsemi and Nexperia parts. This 0.5ns difference may impact timing-critical applications and requires design verification if the original circuit depends on the 1.5ns specification.
Frequently Asked Questions (FAQ)
Q: Can I directly replace 74LCX573WM with MC74LCX573DWR2G without circuit modifications?
A: Yes. Both parts share identical electrical specifications for supply voltage (2V to 3.6V), propagation delay (1.5ns), output current (24mA), and package type (20-SOIC). Pin compatibility is maintained. The MC74LCX573DWR2G offers improved product status (active vs. obsolete) and extended operating temperature range.
Q: What is the difference between MC74LCX573DWG and MC74LCX573DWR2G?
A: Both parts are electrically identical with matching supply voltage, propagation delay, and output specifications. The primary difference is packaging: MC74LCX573DWG is supplied in Tube format, while MC74LCX573DWR2G is supplied in Tape & Reel format. Selection depends on production volume and assembly line requirements.
Q: Why do Texas Instruments parts (SN74LVC573 series) specify different propagation delay?
A: The SN74LVC573 series specifies 2ns propagation delay compared to 1.5ns for onsemi and Nexperia equivalents. This represents a different design implementation within the same functional specification. Applications with timing margins greater than 0.5ns can accommodate this variation without modification.
Q: Are all substitute parts ROHS3 compliant?
A: All active substitute parts listed are ROHS3 compliant. The original 74LCX573WM does not specify RoHS status. All recommended alternatives meet current environmental compliance requirements.
Q: Can I use SN74LVC573ANS in applications requiring -55°C minimum operating temperature?
A: No. The SN74LVC573ANS specifies -40°C minimum operating temperature, which does not meet -55°C requirements. For extended low-temperature operation, use MC74LCX573DWG or MC74LCX573DWR2G, which are rated to -55°C.
Q: What is the significance of the 74LVC573AD-Q100J automotive qualification?
A: The 74LVC573AD-Q100J carries AEC-Q100 automotive qualification, indicating compliance with automotive industry reliability and testing standards. This variant is suitable for automotive applications requiring qualified component status. Non-automotive applications can use standard industrial-grade alternatives.
Q: Are there package size differences between substitute parts?
A: All substitute parts use 20-SOIC package type with identical pin count and footprint. Package dimensions are standardized at 0.295" width (7.50mm). Physical board-level compatibility is maintained across all substitutes.
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