Part A
74VHC245FT
東芝電晶體與存儲
- Lifecycle
- Active
- Stock
- 4188 件
- Package
- TSSOP-20
- Series
- 邏輯-緩衝器、驅動器、接收器、收發器
Replacement verdict
Not a drop-in replacement
The 74VHC245FT and 74VHC02MTC are not functionally interchangeable. The 74VHC245FT is an octal bus transceiver with 3-state outputs, while the 74VHC02MTC is a quad 2-input NOR gate. They differ in logic function, channel configuration, pinout, and package type, making direct substitution impossible without redesign.
Different logic function
Different channel count
Different pinout
Different package type
Parts at a glance
Part B
74VHC02MTC
安森美
- Lifecycle
- Active
- Stock
- 8517 件
- Series
- 邏輯-門和逆變器
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 74VHC245FT | 74VHC02MTC | Why it matters |
|---|---|---|---|
| Logic Function | Octal Bus Transceiver, 3-state | Quad 2-input NOR gate | Defines the fundamental logic operation; these devices are not functionally interchangeable. |
| Number of Channels / Gates | 8 channels (bidirectional) | 4 gates (2-input NOR) | Determines how many independent signal paths or logic functions are available. |
| Direction Control | Direction pin (A-to-B or B-to-A) | Not applicable | Bus transceivers require direction control for bidirectional data flow; logic gates do not. |
| Output Type | 3-state (tri-state) outputs | Standard push-pull CMOS output | Tri-state outputs allow bus sharing; standard outputs cannot be tied together. |
| Output Enable | Yes (OE pin) | No | Output enable allows high-impedance state for multiplexed bus architectures. |
| Supply Voltage Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | Both support the same VHC family voltage range, enabling similar system-level power design. |
| Logic Family | VHC (Very High Speed CMOS) | VHC (Very High Speed CMOS) | Same family implies compatible input/output thresholds and similar speed characteristics. |
| Propagation Delay (typ.) | ~4.5 ns at 5 V | ~5.5 ns at 5 V | Affects timing margins in high-speed digital systems. |
| Package | TSSOP-20 | SOIC-14 | Different footprints and pin counts prevent direct PCB drop-in replacement. |
| Pin Count | 20 | 14 | Pin count mismatch means the devices cannot share the same PCB footprint. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 74VHC245FT | 74VHC02MTC |
|---|---|---|
| Supplier | - | onsemi |
| Series | 74VHC | 74VHC |
| Part Status | Active | Obsolete |
| Logic Type | Transceiver, Non-Inverting | NOR Gate |
| Number of Circuits | - | 4 |
| Number of Inputs | - | 2 |
| Voltage - Supply | 2V ~ 5.5V | 2V ~ 5.5V |
| Current - Quiescent (Max) | - | 2 µA |
| Current - Output High Low | 8mA, 8mA | 8mA, 8mA |
| Logic Level - Low | - | 0.5V |
| Logic Level - High | - | 1.5V |
| Max Propagation Delay @ V Max CL | - | 7.5ns @ 5V, 50pF |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Number of Elements | 1 | - |
| Number of Bits per Element | 8 | - |
| Output Type | 3-State | - |
Frequently asked questions
What are the primary functions of the 74VHC245FT and 74VHC02MTC?
The 74VHC245FT is an octal bidirectional transceiver with 3-state outputs, designed for asynchronous two-way data bus communication. The 74VHC02MTC is a quad 2-input NOR gate, providing four independent logic gates for general-purpose logic inversion and combination.
Are the 74VHC245FT and 74VHC02MTC pin-compatible or functionally interchangeable?
No. The 74VHC245FT is a 20-pin device (TSSOP20) with data direction and output-enable controls, while the 74VHC02MTC is a 14-pin device (TSSOP14) containing four NOR gates. They have different pin counts, pin functions, and logic architectures, so they are not interchangeable.
What are the operating voltage ranges for the 74VHC245FT and 74VHC02MTC?
Both devices are members of the VHC family and operate over a supply voltage range of 2.0 V to 5.5 V, with typical operation at 3.3 V or 5.0 V. This wide range supports mixed-voltage system designs.
What are the maximum operating frequencies or propagation delays for these devices?
The 74VHC245FT and 74VHC02MTC are characterized by propagation delay (tPD) rather than a maximum operating frequency. At 5.0 V, typical tPD is approximately 3.5 ns to 5.5 ns depending on load and temperature. For exact limits, refer to the manufacturer datasheet.
What output drive current can the 74VHC245FT and 74VHC02MTC sink or source?
Both devices provide standard VHC-family output drive: ±8 mA at 5.0 V (sink/source) and ±4 mA at 3.3 V, with symmetrical drive characteristics. These ratings are specified at recommended operating conditions in the respective datasheets.
What are the package and pin count differences between the 74VHC245FT and 74VHC02MTC?
The 74VHC245FT is supplied in a 20-pin TSSOP (TSSOP20) package. The 74VHC02MTC is supplied in a 14-pin TSSOP (TSSOP14) package. The package body widths are similar, but the pin counts and pinouts differ.
Can the 74VHC245FT and 74VHC02MTC be used in the same design without level-shifting concerns?
Yes, both devices are VHC-family parts with the same 2.0 V to 5.5 V supply range and CMOS-compatible input thresholds, so they can share a common supply rail without additional level shifting, provided the system logic levels are within the specified VIL/VIH limits.
What are the input/output logic thresholds for the 74VHC245FT and 74VHC02MTC?
Both devices use standard CMOS input thresholds: at 5.0 V, VIL max = 0.8 V and VIH min = 2.0 V; at 3.3 V, VIL max = 0.8 V and VIH min = 2.0 V. Output levels are rail-to-rail CMOS compatible.
Are the 74VHC245FT and 74VHC02MTC qualified for automotive or industrial temperature ranges?
The standard versions of both devices are specified for the industrial temperature range of −40 °C to +85 °C. Automotive-qualified variants, if available, would carry a separate part number and AEC-Q100 qualification; the base part numbers do not imply automotive qualification.