PI49FCT806ATQ Equivalent & Substitute Parts

Part Overview

The PI49FCT806ATQ is a Clock Fanout Buffer (Distribution) IC manufactured by Diodes Incorporated, designed for 1:5 clock distribution at 66 MHz maximum frequency. This device features 2 circuits with CMOS/TTL input compatibility and CMOS output, operating within a 4.75V to 5.25V supply range across -40°C to 85°C. The part is mounted in a 20-SSOP (0.154", 3.90mm Width) package and is classified as obsolete. Due to its obsolete status and limited availability, equivalent substitute parts from Renesas Electronics Corporation are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	PI49FCT806ATQ
Manufacturer	Diodes Incorporated
Series	49FCT
Type	Fanout Buffer (Distribution)
Number of Circuits	2
Ratio - Input:Output	1:5
Input Type	CMOS, TTL
Output Type	CMOS
Frequency - Max	66 MHz
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the PI49FCT806ATQ is determined by the following critical parameters:

Functional Equivalence Parameters:

Fanout Buffer (Distribution) type with 1:5 input-to-output ratio
2 circuits per device
20-SSOP package form factor (0.154", 3.90mm Width)
Surface mount technology

Electrical Compatibility Parameters:

Input compatibility: CMOS/LVTTL (broader than original TTL/CMOS)
Output type: CMOS/LVTTL
Supply voltage range: 3V ~ 3.6V (narrower than original 4.75V ~ 5.25V)
Operating temperature: -40°C ~ 85°C (extended range variants available)
Maximum frequency: 66 MHz minimum (166 MHz variants available for higher performance)

Regulatory & Compliance Parameters:

RoHS3 compliance (improvement over non-compliant original)
Moisture Sensitivity Level: 1 (Unlimited)
REACH Unaffected status

All substitute parts are manufactured by Renesas Electronics Corporation under the 49FCT3805 base product number with varying speed grades (A, D, E) and packaging options (Tube, Cut Tape, Tape & Reel).

Parameter Comparison

Parameter	PI49FCT806ATQ	49FCT3805AQG	49FCT3805AQG8	49FCT3805AQGI	49FCT3805AQGI8	49FCT3805DQGI	49FCT3805DQGI8	49FCT3805EQGI	49FCT3805EQGI8	49FCT3805QG	49FCT3805QG8
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
Number of Circuits	2	2	2	2	2	2	2	2	2	2	2
Ratio - Input:Output	1:5	1:5	1:5	1:5	1:5	1:5	1:5	1:5	1:5	1:5	1:5
Input Type	CMOS, TTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL
Output Type	CMOS	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL	CMOS, LVTTL
Frequency - Max	66 MHz	66 MHz	66 MHz	66 MHz	66 MHz	166 MHz	166 MHz	166 MHz	166 MHz	66 MHz	66 MHz
Voltage - Supply	4.75V ~ 5.25V	3V ~ 3.6V	3V ~ 3.6V	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	0°C ~ 70°C	0°C ~ 70°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
Package / Case	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.209", 5.30mm)	20-SSOP (0.154", 3.90mm)	20-SSOP (0.154", 3.90mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Option	-	Tube	Cut Tape (CT)	Tube	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Tube	Tape & Reel (TR)

Engineering Selection Recommendations

For Direct Functional Replacement (66 MHz Operation):

Select 49FCT3805AQGI8 or 49FCT3805AQGI for applications requiring the full -40°C to 85°C operating temperature range. These parts maintain the 1:5 fanout buffer configuration with identical 20-SSOP package dimensions (0.154", 3.90mm Width) and are available in high-volume packaging (Tape & Reel or Tube). Both are ROHS3 compliant and active products with established supply chains.

For commercial temperature range applications (0°C to 70°C), 49FCT3805AQG or 49FCT3805AQG8 provide equivalent functionality with lower cost and broader availability.

For Enhanced Performance (166 MHz Operation):

The 49FCT3805DQGI8 and 49FCT3805EQGI8 offer 2.5x frequency capability (166 MHz) while maintaining backward compatibility with the 1:5 fanout buffer architecture and -40°C to 85°C temperature range. These are suitable for designs requiring higher clock distribution speeds without circuit topology changes.

Supply Voltage Consideration:

All Renesas 49FCT3805 variants operate at 3V to 3.6V, which differs from the original PI49FCT806ATQ specification of 4.75V to 5.25V. System power supply architecture must be evaluated to confirm compatibility with the lower voltage range.

Compliance Status:

All substitute parts are ROHS3 compliant, addressing regulatory requirements that the obsolete PI49FCT806ATQ cannot meet. Moisture Sensitivity Level remains at 1 (Unlimited) across all variants.

Frequently Asked Questions (FAQ)

Q: Can the 49FCT3805 series directly replace the PI49FCT806ATQ in existing designs?

A: Functional replacement is possible for the 1:5 fanout buffer operation and package form factor. However, the supply voltage range differs (3V–3.6V vs. 4.75V–5.25V). System power supply must be evaluated. Input/output logic levels are compatible (CMOS/LVTTL vs. CMOS/TTL).

Q: What is the difference between the A, D, and E speed grades in the 49FCT3805 series?

A: Speed grade A operates at 66 MHz maximum frequency. Speed grades D and E both operate at 166 MHz maximum frequency, providing 2.5x higher clock distribution capability. All grades maintain the same 1:5 fanout buffer architecture and package dimensions.

Q: Which packaging option should be selected for production?

A: Tape & Reel (TR) packaging (designated with "8" suffix, e.g., 49FCT3805AQGI8) is recommended for automated assembly and high-volume production. Tube packaging is suitable for lower-volume applications or manual assembly. Cut Tape (CT) provides intermediate volume flexibility.

Q: Are there temperature range variants available?

A: Yes. Parts designated with "Q" (e.g., 49FCT3805AQG) operate at 0°C to 70°C commercial range. Parts designated with "QGI" or "QGI8" operate at -40°C to 85°C industrial range. Select based on application environment requirements.

Q: What is the impact of the 49FCT3805EQGI8 package dimension change?

A: The 49FCT3805EQGI8 uses a 20-SSOP package with 0.209" width (5.30mm) compared to the standard 0.154" width (3.90mm) used by other variants. This dimension change may affect PCB layout compatibility. Verify footprint compatibility before selection.

Q: Is RoHS3 compliance mandatory for the substitute part?

A: All active Renesas 49FCT3805 variants are ROHS3 compliant. The original PI49FCT806ATQ is RoHS non-compliant. For applications subject to RoHS regulations, substitute parts are required.

Q: What inventory levels are available for each substitute part?

A: Inventory varies by variant. 49FCT3805AQGI8 has 4090 units in stock. 49FCT3805QG has 5100 units. 49FCT3805DQGI8 has 4027 units. Verify current availability with your supplier for production scheduling.

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