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74ACT16646DLRG4 Equivalent & Substitute Parts
Part Overview
The 74ACT16646DLRG4 is a non-inverting transceiver IC from Texas Instruments, featuring 2 elements with 8 bits per element and 3-state output capability in a 56-SSOP package. This part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. The device operates within the 4.5V to 5.5V supply voltage range and maintains consistent performance across the -40°C to 85°C operating temperature range.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Series | 74ACT |
| Logic Type | Transceiver, Non-Inverting |
| Number of Elements | 2 |
| Number of Bits per Element | 8 |
| Output Type | 3-State |
| Current - Output High, Low | 24mA, 24mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 56-BSSOP (0.295", 7.50mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the 74ACT16646DLRG4 is determined by strict equivalence across the following parameters:
- Logic Type: Transceiver, Non-Inverting
- Number of Elements: 2
- Number of Bits per Element: 8
- Output Type: 3-State
- Current - Output High, Low: 24mA, 24mA
- Voltage - Supply: 4.5V ~ 5.5V
- Operating Temperature: -40°C ~ 85°C (TA)
- Package / Case: 56-BSSOP (0.295", 7.50mm Width)
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level (MSL): 1 (Unlimited)
All substitute parts listed below meet these criteria. Packaging format (Tape & Reel vs. bulk) does not affect functional equivalence.
Parameter Comparison
| Part Number | Manufacturer | Series | Product Status | Logic Type | Elements | Bits/Element | Output Type | Current (mA) | Supply Voltage | Temp Range | Package | Inventory |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 74ACT16646DLRG4 | Texas Instruments | 74ACT | Discontinued | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | 1152 Pcs |
| 74ACT16543DLR | Texas Instruments | 74ACT | Active | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | 1871 Pcs |
| 74ACT16646DLR | Texas Instruments | 74ACT | Active | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | 2200 Pcs |
| 74ACT16657DLR | Texas Instruments | 74ACT | Active | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | 768 Pcs |
| 74FCT162652ATPVCT | Texas Instruments | 74FCT | Obsolete | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | 830 Pcs |
| CY74FCT162543TPVCT | Texas Instruments | 74FCT | Obsolete | Non-Inverting | 2 | 8 | 3-State | 24/24 | 4.5V ~ 5.5V | -40°C ~ 85°C | 56-BSSOP | 1018 Pcs |
Engineering Selection Recommendations
For new designs and production applications, prioritize active product status parts: 74ACT16543DLR, 74ACT16646DLR, and 74ACT16657DLR. These parts maintain full manufacturer support and are available in higher quantities.
The 74ACT16646DLR offers the highest inventory level (2200 Pcs) and is functionally identical to the discontinued 74ACT16646DLRG4, differing only in packaging format (Tape & Reel vs. bulk). This part is the primary recommended substitute.
The 74FCT162652ATPVCT and CY74FCT162543TPVCT are obsolete parts and should be used only when existing inventory constraints require their use. Both maintain full parametric equivalence and ROHS3 compliance.
All substitute parts carry ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage conditions.
Frequently Asked Questions (FAQ)
Q: Can 74ACT16646DLR directly replace 74ACT16646DLRG4?
A: Yes. Both parts are parametrically identical across all functional specifications. The primary difference is packaging format: 74ACT16646DLRG4 is bulk packaging while 74ACT16646DLR is Tape & Reel. Electrical performance and pin configuration are identical.
Q: Why is 74ACT16646DLRG4 discontinued?
A: The part is discontinued at DiGi Electronics. Active equivalents from the same series (74ACT16543DLR, 74ACT16646DLR, 74ACT16657DLR) provide continued availability with identical electrical characteristics.
Q: Are 74FCT series parts suitable replacements?
A: Yes, 74FCT162652ATPVCT and CY74FCT162543TPVCT meet all parametric requirements. However, both are obsolete. Use only if existing inventory is available and long-term supply is not a concern.
Q: What is the difference between 74ACT16543DLR, 74ACT16646DLR, and 74ACT16657DLR?
A: All three parts are functionally equivalent based on the provided parameters. They differ in internal logic configuration but maintain identical electrical specifications, package type, and operating characteristics. Selection depends on specific application requirements and inventory availability.
Q: Does packaging format affect compatibility?
A: No. Tape & Reel (TR) and bulk packaging formats contain identical die and electrical performance. Packaging format affects only handling, storage, and assembly processes, not functional equivalence.
Q: Are all substitutes ROHS3 compliant?
A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting environmental and regulatory requirements for current manufacturing standards.
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