PI74VCX16374A Equivalent & Substitute Parts

Part Overview

The PI74VCX16374A is a dual 8-bit D-type flip-flop logic IC manufactured by Diodes Incorporated in 48-TFSOP surface mount packaging. This component functions as a standard positive edge-triggered flip-flop with tri-state, non-inverted outputs, operating across a 1.8V to 3.6V supply range with a maximum clock frequency of 250 MHz.

The PI74VCX16374A is classified as obsolete. Substitute parts are necessary to ensure design continuity, maintain supply chain reliability, and access active product support from manufacturers.

Key Parameters

Parameter	Value
Function	D-Type Flip-Flop
Number of Elements	2
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Trigger Type	Positive Edge
Clock Frequency	250 MHz
Max Propagation Delay @ 3.3V, 30pF	3 ns
Voltage Supply Range	1.8V ~ 3.6V
Current Output High/Low	24 mA / 24 mA
Quiescent Current (Iq)	20 µA
Input Capacitance	6 pF
Operating Temperature	-40°C ~ 85°C
Package Type	48-TFSOP (0.240", 6.10mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the PI74VCX16374A is determined by the following critical parameters:

Functional equivalence: D-Type flip-flop with 2 elements, 8 bits per element, tri-state non-inverted outputs, positive edge trigger
Electrical compatibility: Supply voltage range must encompass or be compatible with 1.8V ~ 3.6V; clock frequency and propagation delay must meet or exceed performance specifications
Package compatibility: Surface mount 48-pin packages (TFSOP, TVSOP, or SSOP variants)
Output drive capability: Current output ratings of 24 mA or greater for both high and low states

Substitute parts are grouped into two categories:

Category 1 - Direct Package Match (48-TFSOP):

74VCX16374MTDX (Fairchild Semiconductor)
SN74ALVCH162374GR (Texas Instruments)
SN74ALVCH16374DGG (Texas Instruments)
SN74ALVCH16374DGGR (Texas Instruments)

Category 2 - Alternative Surface Mount Packages (48-TVSOP, 48-SSOP):

SN74ALVCH16374DGVR (Texas Instruments, 48-TVSOP)
SN74ALVCH16374DL (Texas Instruments, 48-SSOP)
SN74ALVCH16374DLR (Texas Instruments, 48-SSOP)

Parameter Comparison

Part Number	Manufacturer	Series	Clock Frequency (MHz)	Max Propagation Delay @ 3.3V (ns)	Voltage Supply (V)	Output Current (mA)	Quiescent Current (µA)	Package	Product Status
PI74VCX16374A	Diodes Incorporated	74VCX	250	3.0	1.8 ~ 3.6	24 / 24	20	48-TFSOP	Obsolete
74VCX16374MTDX	Fairchild Semiconductor	74VCX	250	3.0	1.2 ~ 3.6	24 / 24	20	48-TFSOP	Active
SN74ALVCH162374GR	Texas Instruments	74ALVCH	150	4.6	1.65 ~ 3.6	12 / 12	40	48-TFSOP	Active
SN74ALVCH16374DGG	Texas Instruments	74ALVCH	150	4.2	1.65 ~ 3.6	24 / 24	40	48-TFSOP	Active
SN74ALVCH16374DGGR	Texas Instruments	74ALVCH	150	4.2	1.65 ~ 3.6	24 / 24	40	48-TFSOP	Active
SN74ALVCH16374DGVR	Texas Instruments	74ALVCH	150	4.2	1.65 ~ 3.6	24 / 24	40	48-TVSOP	Active
SN74ALVCH16374DL	Texas Instruments	74ALVCH	150	4.2	1.65 ~ 3.6	24 / 24	40	48-SSOP	Active
SN74ALVCH16374DLR	Texas Instruments	74ALVCH	150	4.2	1.65 ~ 3.6	24 / 24	40	48-SSOP	Active

Engineering Selection Recommendations

Primary Recommendation: 74VCX16374MTDX

The 74VCX16374MTDX from Fairchild Semiconductor is the closest functional equivalent. It maintains the 74VCX series designation, identical clock frequency (250 MHz), propagation delay (3 ns @ 3.3V, 30pF), and output drive capability (24 mA). The supply voltage range extends to 1.2V, providing broader compatibility. This part is in active production status, ensuring long-term availability and manufacturer support.

Secondary Recommendation: SN74ALVCH16374DGG or SN74ALVCH16374DGGR

The Texas Instruments SN74ALVCH16374 series (DGG or DGGR variants) provides active product status with RoHS3 compliance. These parts maintain the same package footprint (48-TFSOP), output drive capability (24 mA), and operating temperature range. The trade-off is reduced clock frequency (150 MHz versus 250 MHz) and slightly increased propagation delay (4.2 ns). These parts are suitable for applications where the original 250 MHz specification is not a hard requirement.

Package Alternatives: SN74ALVCH16374DGVR, SN74ALVCH16374DL, SN74ALVCH16374DLR

For designs with PCB layout flexibility, the 48-TVSOP (SN74ALVCH16374DGVR) and 48-SSOP variants (SN74ALVCH16374DL, SN74ALVCH16374DLR) offer identical electrical performance to the 48-TFSOP versions. The TVSOP package is narrower (4.40mm versus 6.10mm width), and the SSOP package is wider (7.50mm). Selection depends on available board space and routing requirements.

Compliance Considerations:

The PI74VCX16374A is RoHS non-compliant. All Texas Instruments substitutes (SN74ALVCH series) are RoHS3 compliant. The 74VCX16374MTDX compliance status is not specified in the provided data. For applications requiring RoHS compliance, the SN74ALVCH series is mandatory.

Frequently Asked Questions (FAQ)

Q: Can I directly replace PI74VCX16374A with SN74ALVCH16374DGG on my PCB?

A: Yes, if your application does not require the full 250 MHz clock frequency. Both parts use the same 48-TFSOP package with identical pinout. The SN74ALVCH16374DGG operates at 150 MHz with 4.2 ns propagation delay versus the original 3 ns. Verify that your circuit timing margins accommodate the slower performance before substitution.

Q: What is the difference between SN74ALVCH16374DGG and SN74ALVCH16374DGGR?

A: Both parts are electrically identical. The "R" suffix indicates Tape & Reel packaging, while DGG is supplied in standard packaging. Select based on your procurement and assembly requirements. Tape & Reel (DGGR) is typically preferred for high-volume automated assembly.

Q: Can I use SN74ALVCH16374DL instead of the 48-TFSOP package?

A: Yes, if your PCB layout permits the 48-SSOP package (0.295" width versus 0.240" for TFSOP). The electrical performance is identical to SN74ALVCH16374DGG. Verify that the wider package footprint does not conflict with adjacent components or routing constraints.

Q: Is 74VCX16374MTDX the best substitute for the obsolete PI74VCX16374A?

A: Yes, for applications requiring the original 250 MHz performance specification. The 74VCX16374MTDX maintains the 74VCX series, identical clock frequency, and propagation delay. It is in active production with extended supply voltage range (1.2V ~ 3.6V). Verify RoHS compliance requirements for your application.

Q: What are the key electrical differences between 74VCX and 74ALVCH series?

A: The 74VCX series operates at higher clock frequencies (250 MHz) with faster propagation delays (3 ns). The 74ALVCH series operates at 150 MHz with 4.2 ns propagation delay. Both maintain the same output drive capability (24 mA) and tri-state logic architecture. Select based on your circuit timing requirements.

Q: Do all substitute parts have the same pin configuration?

A: Yes. All listed substitutes maintain the same 48-pin D-Type flip-flop architecture with identical functional pinout. Package variants (TFSOP, TVSOP, SSOP) differ only in physical dimensions, not electrical connections.

Q: Which substitute offers the best long-term availability?

A: The SN74ALVCH16374 series from Texas Instruments offers the highest inventory levels and active production status. The 74VCX16374MTDX from Fairchild Semiconductor is also in active production. Both manufacturers provide long-term support for these logic families.

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