74ACT16543DL Equivalent & Substitute Parts

Part Overview

The 74ACT16543DL is a non-inverting transceiver logic IC manufactured by Texas Instruments, configured as a 2-element, 8-bit per element device with 3-state output capability. The device operates across a 4.5V to 5.5V supply range and is housed in a 56-BSSOP surface mount package. The main part is classified as Last Time Buy, indicating end-of-life status. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain flexibility, and accommodate varying packaging and product status requirements.

Key Parameters

Parameter	Value
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 74ACT16543DL is determined by strict parameter matching across the following criteria:

Primary Substitution 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)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed maintain identical electrical and mechanical specifications. Variations exist only in base product number, series designation, product status, and packaging format (Tube vs. Tape & Reel). Parts are grouped by functional equivalence and availability status.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Packaging	Logic Type	Elements / Bits	Output Type	Supply Voltage	Output Current	Temp Range	Package Type	Inventory
74ACT16543DL	Texas Instruments	74ACT	Last Time Buy	Tube	Transceiver, Non-Inverting	2 / 8	3-State	4.5V ~ 5.5V	24mA, 24mA	-40°C ~ 85°C	56-BSSOP	1332 Pcs
74ACT16543DLR	Texas Instruments	74ACT	Active	Tape & Reel (TR)	Transceiver, Non-Inverting	2 / 8	3-State	4.5V ~ 5.5V	24mA, 24mA	-40°C ~ 85°C	56-BSSOP	1871 Pcs
74ACT16652DL	Texas Instruments	74ACT	Last Time Buy	Tube	Transceiver, Non-Inverting	2 / 8	3-State	4.5V ~ 5.5V	24mA, 24mA	-40°C ~ 85°C	56-BSSOP	1048 Pcs
74ACT16646DL	Texas Instruments	74ACT	Last Time Buy	Tube	Transceiver, Non-Inverting	2 / 8	3-State	4.5V ~ 5.5V	24mA, 24mA	-40°C ~ 85°C	56-BSSOP	4802 Pcs
74ACT16651DL	Texas Instruments	74ACT	Active	Tube	Transceiver, Non-Inverting	2 / 8	3-State	4.5V ~ 5.5V	24mA, 24mA	-40°C ~ 85°C	56-BSSOP	1048 Pcs
CY74FCT162543CTPVC	Texas Instruments	74FCT	Obsolete	Tube	Transceiver, Non-Inverting	2 / 8	3-State	4.5V ~ 5.5V	24mA, 24mA	-40°C ~ 85°C	56-BSSOP	821 Pcs
CY74FCT162543TPVC	Texas Instruments	74FCT	Obsolete	-	Transceiver, Non-Inverting	2 / 8	3-State	4.5V ~ 5.5V	24mA, 24mA	-40°C ~ 85°C	56-BSSOP	839 Pcs
CY74FCT162646ATPVC	Texas Instruments	74FCT	Obsolete	-	Transceiver, Non-Inverting	2 / 8	3-State	4.5V ~ 5.5V	24mA, 24mA	-40°C ~ 85°C	56-BSSOP	1202 Pcs
CY74FCT162646CTPVC	Texas Instruments	74FCT	Obsolete	-	Transceiver, Non-Inverting	2 / 8	3-State	4.5V ~ 5.5V	24mA, 24mA	-40°C ~ 85°C	56-BSSOP	1247 Pcs
CY74FCT162652ATPVC	Texas Instruments	74FCT	Obsolete	-	Transceiver, Non-Inverting	2 / 8	3-State	4.5V ~ 5.5V	24mA, 24mA	-40°C ~ 85°C	56-BSSOP	1095 Pcs
CY74FCT162952BTPVC	Texas Instruments	74FCT	Obsolete	Tube	Transceiver, Non-Inverting	2 / 8	3-State	4.5V ~ 5.5V	24mA, 24mA	-40°C ~ 85°C	56-BSSOP	1103 Pcs

Engineering Selection Recommendations

Primary Recommendation: 74ACT16543DLR

The 74ACT16543DLR is the manufacturer-recommended substitute. It maintains identical electrical and mechanical specifications to the 74ACT16543DL while offering Active product status, ensuring long-term availability and support. The Tape & Reel packaging format is standard for high-volume production environments. This part is the preferred choice for new designs and production continuity.

Secondary Recommendations: 74ACT16651DL and 74ACT16646DL

Both parts maintain full parametric equivalence and are available in Tube packaging. The 74ACT16651DL carries Active product status, providing superior long-term availability compared to Last Time Buy designations. The 74ACT16646DL offers the highest current inventory (4802 Pcs), supporting immediate procurement needs.

Obsolete Series Alternatives: 74FCT Series

The CY74FCT162543CTPVC, CY74FCT162646ATPVC, CY74FCT162646CTPVC, CY74FCT162652ATPVC, and CY74FCT162952BTPVC parts are classified as Obsolete. These parts maintain full electrical and mechanical compatibility but carry end-of-life designation. Selection of obsolete parts should be limited to legacy system maintenance or when Active alternatives are unavailable. All obsolete parts retain ROHS3 compliance and MSL 1 rating.

Compliance Considerations

All listed parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with modern manufacturing and storage requirements. REACH status is unaffected across all parts.

Frequently Asked Questions (FAQ)

Q: Can I substitute 74ACT16543DL with 74ACT16543DLR?

A: Yes. The 74ACT16543DLR is electrically and mechanically identical to the 74ACT16543DL. The primary difference is packaging format (Tape & Reel vs. Tube) and product status (Active vs. Last Time Buy). The 74ACT16543DLR is the manufacturer-recommended substitute for new designs.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging is used for lower-volume orders and manual handling. Tape & Reel packaging is standard for automated assembly lines and high-volume production. Both formats contain identical components; the difference is in delivery and handling method.

Q: Are the 74FCT series parts suitable for new designs?

A: No. The 74FCT series parts (CY74FCT162543CTPVC, CY74FCT162646ATPVC, etc.) are classified as Obsolete. While they maintain full parametric equivalence, they should be used only for legacy system maintenance or repair. For new designs, select from the Active or Last Time Buy 74ACT series alternatives.

Q: What does "Last Time Buy" product status mean?

A: Last Time Buy indicates the manufacturer has announced end-of-life for the part. Existing inventory may be available, but no new production is planned. For long-term supply security, transition to Active status parts such as 74ACT16543DLR or 74ACT16651DL.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) rating, ensuring compatibility with current manufacturing standards and environmental regulations.

Q: Can I use 74ACT16652DL as a substitute for 74ACT16543DL?

A: Yes. The 74ACT16652DL maintains identical electrical specifications, output current, supply voltage, operating temperature range, and package type. It is a parametric equivalent suitable for direct substitution.

Q: Which substitute part has the highest inventory availability?

A: The 74ACT16646DL offers the highest current inventory at 4802 Pcs, followed by 74ACT16543DLR at 1871 Pcs. Both are suitable for immediate procurement.

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