ST2129BQTR Equivalent & Substitute Parts

Part Overview

The ST2129BQTR is a voltage level translator integrated circuit manufactured by STMicroelectronics, designed for bidirectional signal translation between different voltage domains. This device features 1 circuit with 2 bidirectional channels, supporting data rates up to 144 Mbps in an 8-QFN (1.4x1.2) surface mount package. The ST2129BQTR is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility while meeting the electrical and mechanical specifications required for the application.

Key Parameters

Parameter	ST2129BQTR
Manufacturer	STMicroelectronics
Product Status	Obsolete
Translator Type	Voltage Level
Channel Type	Bidirectional
Number of Circuits	1
Channels per Circuit	2
Voltage - VCCA	1.65 V ~ 3.6 V
Voltage - VCCB	1.65 V ~ 5.5 V
Output Type	Push-Pull, Tri-State
Data Rate	144 Mbps
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	8-UFQFN
Supplier Device Package	8-QFN (1.4x1.2)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the ST2129BQTR are selected based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Translator Type: Voltage Level
Channel Type: Bidirectional
Number of Circuits: 1
Channels per Circuit: 2
Output Type: Tri-State capability
Data Rate: Equal to or greater than 144 Mbps
Voltage Range Compatibility: VCCA and VCCB ranges must encompass or match the original specifications
Operating Temperature Range: Must support -40°C minimum
Mounting Type: Surface Mount
RoHS Compliance: ROHS3 Compliant

Substitute parts are grouped into two categories based on product status and operational characteristics:

Category 1: Active Status Parts with Enhanced Performance Parts including 74AVC2T45DC-Q100H, 74AVC2T45DP-Q100H, 74AVC2T45GN,115, 74AVC2T45GS,115, and 74LVC2T45DC-Q100H are active production components offering data rates of 420-500 Mbps, exceeding the ST2129BQTR specification. These parts provide extended operating temperature ranges (-40°C to 125°C) and maintain full RoHS3 compliance.

Category 2: Obsolete Status Parts with Comparable Specifications The 74AVCH2T45GF,115 and 74AVCH2T45GS,115 are obsolete parts with specifications closely aligned to the ST2129BQTR, offering 500 Mbps data rates and identical voltage range support.

Parameter Comparison

Parameter	ST2129BQTR	74AVC2T45DC-Q100H	74AVC2T45DP-Q100H	74AVC2T45GN,115	74AVC2T45GS,115	74LVC2T45DC-Q100H	74AVCH2T45GF,115	74AVCH2T45GS,115
Translator Type	Voltage Level	Voltage Level	Voltage Level	Voltage Level	Voltage Level	Voltage Level	Voltage Level	Voltage Level
Channel Type	Bidirectional	Bidirectional	Bidirectional	Bidirectional	Bidirectional	Bidirectional	Bidirectional	Bidirectional
Number of Circuits	1	1	1	1	1	1	1	1
Channels per Circuit	2	2	2	2	2	2	2	2
Voltage - VCCA	1.65 V ~ 3.6 V	0.8 V ~ 3.6 V	0.8 V ~ 3.6 V	0.8 V ~ 3.6 V	0.8 V ~ 3.6 V	1.2 V ~ 5.5 V	0.8 V ~ 3.6 V	0.8 V ~ 3.6 V
Voltage - VCCB	1.65 V ~ 5.5 V	0.8 V ~ 3.6 V	0.8 V ~ 3.6 V	0.8 V ~ 3.6 V	0.8 V ~ 3.6 V	1.2 V ~ 5.5 V	0.8 V ~ 3.6 V	0.8 V ~ 3.6 V
Output Type	Push-Pull, Tri-State	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Data Rate	144 Mbps	500 Mbps	500 Mbps	500 Mbps	500 Mbps	420 Mbps	500 Mbps	500 Mbps
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-UFQFN	8-VFSOP	8-TSSOP	8-XFDFN	8-XFDFN	8-VFSOP	8-XFDFN	8-XFDFN
Product Status	Obsolete	Active	Active	Active	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not Specified	Not Specified	ROHS3 Compliant	ROHS3 Compliant	Not Specified

Engineering Selection Recommendations

For New Designs and Production:

The 74AVC2T45DC-Q100H and 74AVC2T45DP-Q100H are recommended as primary substitutes for the obsolete ST2129BQTR. Both parts are manufactured by Nexperia USA Inc., carry active product status, and maintain ROHS3 compliance. These devices provide superior data rate performance (500 Mbps versus 144 Mbps) and extended operating temperature range (-40°C to 125°C). The 74AVC2T45DC-Q100H is packaged in 8-VSSOP, while the 74AVC2T45DP-Q100H is available in 8-TSSOP, allowing selection based on PCB layout requirements.

For Voltage Range Considerations:

The 74LVC2T45DC-Q100H offers extended voltage range support (1.2 V ~ 5.5 V for both VCCA and VCCB), providing greater flexibility for applications requiring higher supply voltages. This part maintains active status and ROHS3 compliance with 420 Mbps data rate capability.

For Compact Package Requirements:

The 74AVC2T45GN,115 and 74AVC2T45GS,115 are available in 8-XSON packages (1.2x1 and 1.35x1 respectively), offering minimal footprint solutions with 500 Mbps performance and active product status.

For Existing Inventory Compatibility:

The 74AVCH2T45GS,115 provides an alternative with active status and specifications closely aligned to the ST2129BQTR, though it carries obsolete classification for the 74AVCH2T45GF,115 variant.

Frequently Asked Questions (FAQ)

Q: Can the 74AVC2T45DC-Q100H directly replace the ST2129BQTR in existing designs?

A: The 74AVC2T45DC-Q100H provides functional equivalence for bidirectional voltage level translation with 2 channels. However, package differences exist: the ST2129BQTR uses 8-QFN (1.4x1.2) while the 74AVC2T45DC-Q100H uses 8-VSSOP. PCB layout modifications are required. Electrical specifications are compatible within the overlapping voltage ranges.

Q: What is the primary difference between 74AVC2T45DC-Q100H and 74AVC2T45DP-Q100H?

A: Both parts are functionally equivalent voltage level translators with identical electrical specifications. The primary difference is packaging: 74AVC2T45DC-Q100H uses 8-VSSOP while 74AVC2T45DP-Q100H uses 8-TSSOP. Selection depends on PCB design requirements and available board space.

Q: Why do substitute parts show higher data rates (420-500 Mbps) than the original ST2129BQTR (144 Mbps)?

A: The substitute parts represent newer technology generations with improved performance characteristics. Higher data rate capability does not affect compatibility with applications designed for 144 Mbps operation. The devices operate at the required speed for the application without modification.

Q: Are all substitute parts RoHS3 compliant?

A: The 74AVC2T45DC-Q100H, 74AVC2T45DP-Q100H, and 74LVC2T45DC-Q100H explicitly state ROHS3 compliance. The 74AVC2T45GN,115, 74AVC2T45GS,115, 74AVCH2T45GF,115, and 74AVCH2T45GS,115 do not specify RoHS status in the provided data. Verification with the manufacturer is required for applications with strict RoHS requirements.

Q: What voltage range limitations exist when substituting the ST2129BQTR?

A: The ST2129BQTR supports VCCA 1.65-3.6V and VCCB 1.65-5.5V. Most 74AVC series substitutes support VCCA and VCCB at 0.8-3.6V, which covers the lower end of the original range. The 74LVC2T45DC-Q100H supports 1.2-5.5V for both supplies, providing extended high-voltage capability. Verify application voltage requirements against substitute specifications.

Q: Can the ST2129BQTR be substituted with 74AVC2T245GUX?

A: The 74AVC2T245GUX is a translation transceiver with 2 bits per element in a 10-XQFN package, differing from the ST2129BQTR architecture. While both are bidirectional translators, the 74AVC2T245GUX has different circuit topology and pin configuration. Direct substitution is not supported without circuit redesign.

Q: What is the significance of the AEC-Q100 qualification on 74AVC2T45DC-Q100H and 74AVC2T45DP-Q100H?

A: AEC-Q100 qualification indicates automotive-grade reliability testing and qualification. These parts are suitable for automotive applications requiring enhanced reliability standards. Non-automotive applications can use these parts without restriction.

Q: Are there package footprint compatibility considerations between substitute options?

A: Yes. The ST2129BQTR uses 8-QFN (1.4x1.2), while substitutes use 8-VSSOP, 8-TSSOP, or 8-XSON packages with different footprints and pin layouts. PCB redesign is required for any package change. Verify pin assignments and thermal characteristics for the selected substitute package.

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