FIN1104MTCX Equivalent & Substitute Parts

Part Overview

The FIN1104MTCX is a 4-channel LVDS buffer and redriver IC manufactured by onsemi, designed for high-speed signal conditioning and distribution in interface applications. Operating at data rates up to 800Mbps, this device accepts LVDS and LVPECL inputs and provides LVDS outputs with a propagation delay of 1.75ns. The component is housed in a 24-TSSOP surface mount package and is currently in active production status with full RoHS3 compliance. Substitute parts are identified when equivalent functional performance can be maintained within the specified electrical and mechanical parameter ranges for LVDS redriver applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	FIN1104MTCX
Manufacturer	onsemi
Category	Interface
Type	Buffer, ReDriver
Number of Channels	4
Data Rate (Max)	800Mbps
Input Type	LVDS, LVPECL
Output Type	LVDS
Propagation Delay	1.75ns
Supply Voltage Range	3.0V – 3.6V
Supply Current	41mA
Operating Temperature	-40°C to +85°C
Package Type	24-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the FIN1104MTCX are identified based on functional equivalence in the following critical parameters:

Channel Count: 4 channels (mandatory match)
Data Rate: 800Mbps maximum (mandatory match)
Input/Output Signaling: LVDS input and output capability (mandatory match)
Operating Temperature Range: -40°C to +85°C (mandatory match)
Product Status: Active production (mandatory match)
Compliance: RoHS3 compliant (mandatory match)

The identified substitutes are Texas Instruments DS90LV804 series devices. While these parts operate in different package types (32-WQFN versus 24-TSSOP), they maintain electrical equivalence across all functional parameters. Package differences require PCB layout redesign and are not transparent substitutions at the board level.

Parameter Comparison

Parameter	FIN1104MTCX	DS90LV804TSQ/NOPB	DS90LV804TSQX/NOPB
Manufacturer	onsemi	Texas Instruments	Texas Instruments
Number of Channels	4	4	4
Data Rate (Max)	800Mbps	800Mbps	800Mbps
Input Type	LVDS, LVPECL	CML, LVDS, LVPECL	CML, LVDS, LVPECL
Output Type	LVDS	LVDS	LVDS
Propagation Delay	1.75ns	2.0ns	2.0ns
Supply Voltage Range	3.0V – 3.6V	3.15V – 3.45V	3.15V – 3.45V
Supply Current	41mA	117mA	117mA
Operating Temperature	-40°C to +85°C	-40°C to +85°C	-40°C to +85°C
Package Type	24-TSSOP	32-WQFN (5x5)	32-WQFN (5x5)
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

Both DS90LV804 variants maintain active production status and full RoHS3 compliance, meeting the core compliance requirements for the FIN1104MTCX. The Texas Instruments devices support an extended input range (CML in addition to LVDS and LVPECL), providing functional superset capability.

Key differences requiring design consideration:

Package footprint: The 32-WQFN package is larger than the 24-TSSOP, necessitating PCB layout modifications
Supply current: DS90LV804 devices draw 117mA compared to 41mA for the FIN1104MTCX, requiring power budget reassessment
Propagation delay: DS90LV804 devices introduce 2.0ns delay versus 1.75ns for the FIN1104MTCX, a 0.25ns difference that may impact timing-critical applications
Supply voltage tolerance: DS90LV804 devices operate within a narrower voltage window (3.15V – 3.45V) versus the FIN1104MTCX (3.0V – 3.6V)
Moisture sensitivity: DS90LV804 devices require controlled storage conditions (MSL 3, 168 hours) versus unlimited storage for the FIN1104MTCX

Selection between DS90LV804TSQ/NOPB and DS90LV804TSQX/NOPB is based on availability and procurement requirements, as both variants are electrically identical.

Frequently Asked Questions (FAQ)

Q: Can DS90LV804 devices be used as direct pin-for-pin replacements for the FIN1104MTCX?

A: No. While both devices are 4-channel LVDS redrivers with 800Mbps data rate capability, the package types differ (24-TSSOP versus 32-WQFN). Pin assignments and footprints are not compatible. PCB redesign is required for substitution.

Q: What is the significance of the 0.25ns propagation delay difference?

A: The FIN1104MTCX has 1.75ns delay while DS90LV804 devices have 2.0ns delay. In timing-critical applications where signal synchronization across multiple channels is required, this difference may affect system performance. Verify timing margins in your application before substitution.

Q: Why do DS90LV804 devices consume more supply current?

A: The DS90LV804 devices draw 117mA compared to 41mA for the FIN1104MTCX. This difference is inherent to the Texas Instruments design and requires power supply capacity verification. Ensure your power distribution network can support the higher current draw.

Q: Are the supply voltage ranges compatible?

A: The FIN1104MTCX operates from 3.0V to 3.6V, while DS90LV804 devices operate from 3.15V to 3.45V. The DS90LV804 range is narrower and sits within the FIN1104MTCX range. If your system operates at 3.0V or above 3.45V, verify DS90LV804 compatibility before substitution.

Q: What does Moisture Sensitivity Level (MSL) mean for component handling?

A: The FIN1104MTCX has MSL 1 (unlimited storage without desiccant). DS90LV804 devices have MSL 3 (168-hour limit), requiring controlled storage conditions and bake-out procedures before reflow soldering. This affects component shelf life and handling procedures.

Q: Are DS90LV804TSQ/NOPB and DS90LV804TSQX/NOPB interchangeable?

A: Yes. Both variants are electrically and functionally identical. Selection is based on availability, packaging format (Cut Tape versus Digi-Reel), and procurement preferences.

Q: What input signal types does each device support?

A: The FIN1104MTCX accepts LVDS and LVPECL inputs. DS90LV804 devices accept CML, LVDS, and LVPECL inputs. The DS90LV804 provides broader input compatibility, but this does not affect substitution if your application uses only LVDS or LVPECL signals.

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