Request Quote
(Ships tomorrow)
74FST3345DTR2 Equivalent & Substitute Parts
Part Overview
The 74FST3345DTR2 is an 8 x 1:1 bus switch logic IC manufactured by onsemi in a 20-TSSOP package. This component functions as a high-speed multiplexer for digital signal routing in logic applications. The part is currently obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain identical circuit configuration (8 x 1:1), package compatibility, and electrical operating parameters to ensure functional equivalence.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Type | Bus Switch |
| Circuit Configuration | 8 x 1:1 |
| Independent Circuits | 1 |
| Voltage Supply | Single Supply |
| Supply Voltage Range | 4V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package / Case | 20-TSSOP (0.173", 4.40mm Width) |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the 74FST3345DTR2 is determined by the following critical parameters:
- Circuit configuration: 8 x 1:1 bus switch topology
- Package type: 20-TSSOP or compatible surface mount packages
- Supply voltage range: 4V ~ 5.5V minimum compatibility
- Operating temperature range: -40°C ~ 85°C
- Single supply operation
- Surface mount technology
Substitute parts are grouped into two categories: parametric equivalents (identical electrical and package specifications) and similar parts (same circuit function with minor package or status variations).
Parameter Comparison
| Part Number | Manufacturer | Circuit | Package | Supply Voltage | Temp Range | Product Status | RoHS Status | MSL |
|---|---|---|---|---|---|---|---|---|
| 74FST3345DTR2 | onsemi | 8 x 1:1 | 20-TSSOP | 4V ~ 5.5V | -40°C ~ 85°C | Obsolete | Non-compliant | 1 |
| FST3245MTCX | onsemi | 8 x 1:1 | 20-TSSOP | 4V ~ 5.5V | -40°C ~ 85°C | Obsolete | ROHS3 Compliant | 1 |
| SN74CBT3345CDBQR | Texas Instruments | 8 x 1:1 | 20-SSOP | 4.5V ~ 5.5V | -40°C ~ 85°C | Active | ROHS3 Compliant | 2 |
| SN74CBT3345CPW | Texas Instruments | 8 x 1:1 | 20-TSSOP | 4.5V ~ 5.5V | -40°C ~ 85°C | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3345CPWR | Texas Instruments | 8 x 1:1 | 20-TSSOP | 4.5V ~ 5.5V | -40°C ~ 85°C | Active | ROHS3 Compliant | 1 |
| SN74CBT3345DGVR | Texas Instruments | 8 x 1:1 | 20-TVSOP | 4.5V ~ 5.5V | -40°C ~ 85°C | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3345PW | Texas Instruments | 8 x 1:1 | 20-TSSOP | 4.5V ~ 5.5V | -40°C ~ 85°C | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3345PWR | Texas Instruments | 8 x 1:1 | 20-TSSOP | 4.5V ~ 5.5V | -40°C ~ 85°C | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3245APWR | Texas Instruments | 8 x 1:1 | 20-TSSOP | 4V ~ 5.5V | -40°C ~ 85°C | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3245CPWR | Texas Instruments | 8 x 1:1 | 20-TSSOP | 4V ~ 5.5V | -40°C ~ 85°C | Active | ROHS3 Compliant | 1 |
Engineering Selection Recommendations
For new designs, SN74CBT3245CPWR (Texas Instruments) is the preferred substitute. This part maintains active product status, offers ROHS3 compliance, supports the full 4V ~ 5.5V supply voltage range, and is available in the standard 20-TSSOP package with MSL 1 rating.
SN74CBT3345CPWR provides an alternative with identical package and electrical specifications, also with active status and full compliance certifications.
For applications requiring extended supply voltage tolerance (4V minimum), both SN74CBT3245CPWR and SN74CBT3245APWR accommodate the lower voltage threshold of the original 74FST3345DTR2.
Parts with Last Time Buy status (SN74CBT3345PW, SN74CBT3345PWR, SN74CBT3345DGVR, SN74CBT3245APWR) remain functionally equivalent but have limited future availability. SN74CBT3345CDBQR uses a 20-SSOP package (0.154" width) instead of 20-TSSOP, requiring PCB layout modification.
Frequently Asked Questions (FAQ)
Q: Can SN74CBT3345CDBQR replace 74FST3345DTR2 directly on the PCB?
A: No. SN74CBT3345CDBQR uses a 20-SSOP package (0.154" width) while the original uses 20-TSSOP (0.173" width). PCB footprint modification is required.
Q: What is the difference between 20-TSSOP and 20-TVSOP packages?
A: Both are surface mount packages with similar pitch and lead count. SN74CBT3345DGVR uses 20-TVSOP, which has different physical dimensions. Footprint compatibility must be confirmed before substitution.
Q: Does the supply voltage range difference matter?
A: The original 74FST3345DTR2 supports 4V ~ 5.5V. Most Texas Instruments substitutes support 4.5V ~ 5.5V. If your application operates below 4.5V, use SN74CBT3245CPWR or SN74CBT3245APWR, which maintain the 4V minimum.
Q: Why is RoHS compliance important for this substitution?
A: The original 74FST3345DTR2 is RoHS non-compliant. All active substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements for new production.
Q: Which substitute has the best long-term availability?
A: SN74CBT3245CPWR and SN74CBT3345CPWR both maintain active product status, ensuring continued availability and support from Texas Instruments.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts