PI49FCT807CTQE Equivalent & Substitute Parts

Part Overview

The PI49FCT807CTQE is a Clock Fanout Buffer (Distribution) IC manufactured by Diodes Incorporated, designed for 1:10 clock distribution at 100 MHz. This part operates with CMOS/TTL input and output compatibility, supporting supply voltages from 4.75V to 5.25V across an operating temperature range of -40°C to 85°C. The device is packaged in a 20-SSOP (0.154", 3.90mm Width) form factor.

The PI49FCT807CTQE is classified as obsolete. Substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and legacy system support.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Part Number	PI49FCT807CTQE
Type	Fanout Buffer (Distribution)
Ratio - Input:Output	1:10
Frequency - Max	100 MHz
Input Logic	CMOS, TTL
Output Logic	CMOS, TTL
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SSOP (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the PI49FCT807CTQE is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Ratio - Input:Output: 1:10 (all substitutes maintain this specification)
Package / Case: 20-SSOP (0.154", 3.90mm Width) (all substitutes use identical packaging)
Mounting Type: Surface Mount (consistent across all options)
RoHS Status: ROHS3 Compliant (all substitutes meet this requirement)
Moisture Sensitivity Level: 1 (Unlimited) (all substitutes match this rating)

Electrical Performance Considerations:

Frequency - Max: 100 MHz or higher
Input/Output Logic Compatibility: CMOS and/or TTL
Supply Voltage Range: Must support the application's voltage requirements
Operating Temperature Range: Must encompass the application's thermal requirements

Substitute parts are grouped into two categories based on frequency capability and supply voltage specifications:

Category A - Enhanced Frequency (166 MHz): 74FCT20807QGI, 74FCT20807QGI8, 74FCT3807DQGI, 74FCT3807DQGI8, 74FCT3807EQGI, 74FCT3807EQGI8

Category B - Standard Frequency (100 MHz): 74FCT3807QG, 74FCT3807QG8, 74FCT3807QGI, 74FCT3807QGI8

All substitute parts are manufactured by Renesas Electronics Corporation and maintain active product status, ensuring long-term availability and supply chain stability.

Parameter Comparison

Parameter	PI49FCT807CTQE	74FCT20807QGI	74FCT20807QGI8	74FCT3807DQGI	74FCT3807DQGI8	74FCT3807EQGI	74FCT3807EQGI8	74FCT3807QG	74FCT3807QG8	74FCT3807QGI	74FCT3807QGI8
Manufacturer	Diodes Inc.	Renesas	Renesas	Renesas	Renesas	Renesas	Renesas	Renesas	Renesas	Renesas	Renesas
Type	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer
Ratio - Input:Output	1:10	1:10	1:10	1:10	1:10	1:10	1:10	1:10	1:10	1:10	1:10
Frequency - Max	100 MHz	166 MHz	166 MHz	166 MHz	166 MHz	166 MHz	166 MHz	100 MHz	100 MHz	100 MHz	100 MHz
Input Logic	CMOS, TTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL	LVTTL
Output Logic	CMOS, TTL	LVTTL	LVTTL	CMOS, TTL	CMOS, TTL	CMOS, TTL	CMOS, TTL	CMOS, TTL	CMOS, TTL	CMOS, TTL	CMOS, TTL
Voltage - Supply	4.75V ~ 5.25V	2.3V ~ 2.7V	2.3V ~ 2.7V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP	20-SSOP
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Matched Frequency and Temperature Range):

Use 74FCT3807QGI or 74FCT3807QGI8 when the application operates at 100 MHz with an operating temperature range of -40°C to 85°C. Both parts maintain identical frequency specifications to the PI49FCT807CTQE and support the full extended temperature range. The primary difference is packaging format: 74FCT3807QGI is supplied in Tube packaging, while 74FCT3807QGI8 is supplied in Tape & Reel (TR) format. Both are manufactured by Renesas Electronics Corporation with active product status, ensuring supply chain continuity.

For Enhanced Performance (Higher Frequency Capability):

Use 74FCT3807DQGI, 74FCT3807DQGI8, 74FCT3807EQGI, or 74FCT3807EQGI8 when the application can benefit from 166 MHz maximum frequency capability while maintaining -40°C to 85°C operating temperature range. These parts provide frequency headroom for future design iterations and support CMOS/TTL output logic compatibility. Supply voltage operates at 3V to 3.6V, requiring voltage regulation adjustment from the original 4.75V to 5.25V specification.

For Standard Temperature Range Applications (0°C to 70°C):

Use 74FCT3807QG or 74FCT3807QG8 when the application operates within the commercial temperature range of 0°C to 70°C. These parts maintain 100 MHz frequency matching and are available in Tube (74FCT3807QG) or Tape & Reel (74FCT3807QG8) packaging formats.

For Low-Voltage Applications (2.3V to 2.7V):

Use 74FCT20807QGI or 74FCT20807QGI8 exclusively for systems operating at 2.3V to 2.7V supply voltage with 166 MHz frequency requirements. These parts feature LVTTL input and output logic, requiring signal level translation if interfacing with standard TTL/CMOS logic levels. Available in Tube (74FCT20807QGI) or Tape & Reel (74FCT20807QGI8) packaging.

All substitute parts maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and active product status, ensuring regulatory compliance and long-term availability.

Frequently Asked Questions (FAQ)

Q: Can I use 74FCT3807DQGI as a direct replacement for PI49FCT807CTQE?

A: The 74FCT3807DQGI is functionally compatible as a 1:10 fanout buffer in the same 20-SSOP package. However, the supply voltage differs: PI49FCT807CTQE operates at 4.75V to 5.25V, while 74FCT3807DQGI operates at 3V to 3.6V. Your power supply design must be adjusted accordingly. The 74FCT3807DQGI offers enhanced 166 MHz frequency capability compared to the original 100 MHz specification.

Q: What is the difference between 74FCT3807QGI and 74FCT3807QGI8?

A: Both parts are electrically identical with matching 100 MHz frequency, 3V to 3.6V supply voltage, and -40°C to 85°C operating temperature range. The difference is packaging format: 74FCT3807QGI is supplied in Tube packaging for manual handling and small-quantity applications, while 74FCT3807QGI8 is supplied in Tape & Reel (TR) format for automated assembly and high-volume production.

Q: Why do some substitutes operate at different supply voltages?

A: The 74FCT20807QGI series operates at 2.3V to 2.7V (low-voltage LVTTL), while the 74FCT3807 series operates at 3V to 3.6V. The original PI49FCT807CTQE operates at 4.75V to 5.25V (standard TTL/CMOS). Voltage differences reflect different logic family implementations. Select substitutes based on your system's power supply voltage to avoid signal integrity issues.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and carry Moisture Sensitivity Level 1 (Unlimited), matching the original PI49FCT807CTQE specifications. All parts are suitable for lead-free soldering processes.

Q: What is the advantage of 166 MHz parts over 100 MHz parts?

A: The 74FCT3807DQGI, 74FCT3807DQGI8, 74FCT3807EQGI, 74FCT3807EQGI8, 74FCT20807QGI, and 74FCT20807QGI8 support 166 MHz maximum frequency, providing performance margin above the original 100 MHz specification. This allows for future design upgrades or operation with higher-speed clock signals without component replacement.

Q: Can I use 74FCT3807QG for applications requiring -40°C to 85°C operation?

A: No. The 74FCT3807QG operates within 0°C to 70°C temperature range, which does not cover the extended low-temperature specification of -40°C. Use 74FCT3807QGI or 74FCT3807QGI8 for applications requiring full -40°C to 85°C operation.

Q: What is the inventory status of these substitute parts?

A: All substitute parts maintain active product status with Renesas Electronics Corporation. Current inventory levels range from 661 to 18,300 pieces across various part numbers and packaging formats, ensuring availability for production requirements.

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