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SN74CBT3306PWRG4 Equivalent & Substitute Parts
Part Overview
The SN74CBT3306PWRG4 is a bus switch logic IC manufactured by Texas Instruments, configured as a 1 x 1:1 switch in an 8-TSSOP surface mount package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The part operates within a single supply voltage range of 4.5V to 5.5V and maintains an operating temperature range of -40°C to 85°C. Due to its obsolete status, active or last-time-buy alternatives are required for new designs and production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | SN74CBT3306PWRG4 |
| Category | Logic |
| Type | Bus Switch |
| Circuit Configuration | 1 x 1:1 |
| Independent Circuits | 2 |
| Package / Case | 8-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| Voltage Supply Range | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution eligibility for the SN74CBT3306PWRG4 is determined by the following critical parameters:
Primary Substitution Criteria:
- Circuit configuration: 1 x 1:1 bus switch topology
- Independent circuits: 2
- Package type: 8-TSSOP with 0.173" width (4.40mm)
- Voltage supply range: 4.5V ~ 5.5V (minimum requirement)
- Operating temperature range: -40°C ~ 85°C (minimum requirement)
- Mounting type: Surface mount
- RoHS3 compliance
- Moisture sensitivity level: 1 (Unlimited)
Substitute parts are grouped into three categories based on manufacturer and product status:
Category 1: Texas Instruments Active & Last-Time-Buy Variants Parts within the 74CBT and 74CBTD series from Texas Instruments that maintain identical electrical and mechanical specifications. These include SN74CBT3305CPWR, SN74CBT3306CPWR, SN74CBT3306PWR, SN74CBTD3305CPWR, SN74CBTD3306CPWR, SN74CBTD3306CPWRG4, SN74CBTD3306PWR, and SN74CBTS3306PWR.
Category 2: Alternative Manufacturer Equivalents Parts from Nexperia USA Inc. (CBT3306PW,118) and onsemi (7WBD3306DTR2G) that meet the same functional and electrical specifications within the defined parameter ranges.
Category 3: Packaging Variants Differences in packaging designation (Tape & Reel, Cut Tape & Digi-Reel, or unspecified) do not affect electrical compatibility but may impact procurement and handling procedures.
Parameter Comparison
| Part Number | Manufacturer | Series | Product Status | Voltage Supply | Operating Temp | Package | Circuit Config | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| SN74CBT3306PWRG4 | Texas Instruments | 74CBT | Obsolete | 4.5V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | 1 x 1:1 | ROHS3 |
| SN74CBT3305CPWR | Texas Instruments | 74CBT | Active | 4.5V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | 1 x 1:1 | ROHS3 |
| SN74CBT3306CPWR | Texas Instruments | 74CBT | Active | 4.5V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | 1 x 1:1 | ROHS3 |
| SN74CBT3306PWR | Texas Instruments | 74CBT | Last Time Buy | 4.5V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | 1 x 1:1 | ROHS3 |
| SN74CBTD3305CPWR | Texas Instruments | 74CBTD | Active | 4.5V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | 1 x 1:1 | ROHS3 |
| SN74CBTD3306CPWR | Texas Instruments | 74CBTD | Active | 4.5V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | 1 x 1:1 | ROHS3 |
| SN74CBTD3306CPWRG4 | Texas Instruments | 74CBTD | Discontinued at DiGi Electronics | 4.5V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | 1 x 1:1 | ROHS3 |
| SN74CBTD3306PWR | Texas Instruments | 74CBTD | Last Time Buy | 4.5V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | 1 x 1:1 | ROHS3 |
| SN74CBTS3306PWR | Texas Instruments | 74CBTS | Last Time Buy | 4.5V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | 1 x 1:1 | ROHS3 |
| 7WBD3306DTR2G | onsemi | — | Obsolete | 4V ~ 5.5V | -55°C ~ 125°C | 8-TSSOP | 1 x 1:1 | ROHS3 |
| CBT3306PW,118 | Nexperia USA Inc. | 74CBT | Active | 4.5V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | 1 x 1:1 | ROHS3 |
Engineering Selection Recommendations
Primary Recommendation: Active Status Parts
For new designs and production applications, select from Texas Instruments active-status parts: SN74CBT3305CPWR, SN74CBT3306CPWR, SN74CBTD3305CPWR, or SN74CBTD3306CPWR. These parts maintain full product support, documented availability, and compliance with ROHS3 and REACH requirements. All are packaged in Tape & Reel format suitable for automated assembly.
Secondary Recommendation: Last-Time-Buy Parts
SN74CBT3306PWR, SN74CBTD3306PWR, and SN74CBTS3306PWR are designated as last-time-buy. These parts remain available in limited quantities but should be considered only when active alternatives are unavailable or when existing inventory must be consumed.
Alternative Manufacturer Option
CBT3306PW,118 from Nexperia USA Inc. is an active-status equivalent that meets all electrical and mechanical specifications. This part provides an alternative supply source with identical parameter compliance.
Avoid for New Designs
SN74CBT3306PWRG4 (obsolete), SN74CBTD3306CPWRG4 (discontinued at DiGi Electronics), and 7WBD3306DTR2G (obsolete) should not be selected for new designs. The onsemi part 7WBD3306DTR2G, while functionally equivalent, operates at an extended temperature range (-55°C ~ 125°C) and lower minimum voltage (4V), which may introduce unnecessary design complexity.
Frequently Asked Questions (FAQ)
Q: Can SN74CBT3306PWRG4 be directly replaced with SN74CBT3306CPWR?
A: Yes. Both parts share identical electrical specifications (4.5V ~ 5.5V supply, -40°C ~ 85°C operating range), circuit configuration (1 x 1:1), and 8-TSSOP package. The primary difference is packaging format (Tape & Reel for CPWR versus unspecified for PWRG4) and product status (Active versus Obsolete). Direct substitution is valid from an electrical and mechanical standpoint.
Q: What is the difference between 74CBT and 74CBTD series parts?
A: Both series maintain identical electrical and mechanical specifications for the 3306 configuration. The series designation reflects internal design variants within Texas Instruments' product line. All 74CBT and 74CBTD equivalents listed are functionally interchangeable for the SN74CBT3306PWRG4 application.
Q: Is the onsemi 7WBD3306DTR2G suitable as a substitute?
A: The 7WBD3306DTR2G meets the core functional requirements (1 x 1:1 bus switch, 8-TSSOP package, ROHS3 compliance). However, it operates at a lower minimum supply voltage (4V versus 4.5V) and an extended temperature range (-55°C ~ 125°C). Substitution is valid only if the application does not require the 4.5V minimum threshold and if the extended temperature range does not introduce unnecessary design margin.
Q: Why should I avoid the Nexperia CBT3306PW,118 part?
A: The Nexperia CBT3306PW,118 is not recommended for avoidance. It is an active-status part with identical specifications to the main part and is a valid alternative source. Selection between Texas Instruments and Nexperia variants depends on supply chain availability and procurement preferences.
Q: What does "Last Time Buy" status mean for SN74CBT3306PWR?
A: Last-time-buy status indicates that the manufacturer has announced end-of-life for the part. Limited inventory remains available through distributors, but no new production will occur. These parts are suitable for existing production runs or inventory replenishment but should not be selected for new long-term designs.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed in this document are ROHS3 compliant and REACH unaffected, matching the compliance status of the SN74CBT3306PWRG4.
Q: Does packaging format (Tape & Reel versus Cut Tape) affect electrical compatibility?
A: No. Packaging format affects procurement, handling, and assembly procedures but does not alter electrical or mechanical compatibility. Parts with different packaging designations are electrically interchangeable.
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