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74ACTQ245PC Equivalent & Substitute Parts
Part Overview
The 74ACTQ245PC is an octal bus transceiver with non-inverting logic, featuring 3-state output capability. Manufactured by onsemi, this 20-DIP through-hole component operates across a 4.5V to 5.5V supply range and is rated for -40°C to 85°C operating temperature. The part is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Specification |
|---|---|
| Logic Type | Transceiver, Non-Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Output Type | 3-State |
| Current - Output High, Low | 24mA, 24mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Through Hole |
| Package / Case | 20-DIP (0.300", 7.62mm) |
Substitute Part Grouping Explanation
Substitution for the 74ACTQ245PC is determined by matching the following critical parameters:
- Logic type: Transceiver, Non-Inverting
- Bit configuration: 1 Element, 8 Bits per Element
- Output capability: 3-State
- Output current: 24mA (High and Low)
- Supply voltage range: 4.5V ~ 5.5V
- Package: 20-DIP (0.300", 7.62mm)
- Mounting: Through Hole
All identified substitutes maintain these electrical and mechanical specifications, ensuring direct functional compatibility in circuit applications.
Parameter Comparison
| Parameter | 74ACTQ245PC (onsemi) | CD74ACT245E (Harris) | SN74ACT245N (TI) | SN74ACT245NE4 (TI) |
|---|---|---|---|---|
| Logic Type | Transceiver, Non-Inverting | Transceiver, Non-Inverting | Transceiver, Non-Inverting | Transceiver, Non-Inverting |
| Number of Elements | 1 | 1 | 1 | 1 |
| Number of Bits per Element | 8 | 8 | 8 | 8 |
| Output Type | 3-State | 3-State | 3-State | 3-State |
| Current - Output High, Low | 24mA, 24mA | 24mA, 24mA | 24mA, 24mA | 24mA, 24mA |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -55°C ~ 125°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole |
| Package / Case | 20-DIP (0.300", 7.62mm) | 20-DIP (0.300", 7.62mm) | 20-DIP (0.300", 7.62mm) | 20-DIP (0.300", 7.62mm) |
| Product Status | Obsolete | Obsolete | Active | Active |
| RoHS Status | Not specified | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
For new designs and ongoing procurement, SN74ACT245N or SN74ACT245NE4 (both Texas Instruments) are the preferred substitutes. Both parts maintain active product status and achieve ROHS3 compliance, supporting modern supply chain requirements and regulatory standards.
CD74ACT245E (Harris Corporation) provides parametric equivalence with extended operating temperature range (-55°C to 125°C), suitable for applications requiring broader thermal performance. However, this part carries obsolete status and RoHS non-compliance designation.
All three substitutes are electrically and mechanically interchangeable with the 74ACTQ245PC within the specified parameter constraints.
Frequently Asked Questions (FAQ)
Q: Can SN74ACT245N directly replace 74ACTQ245PC in existing circuits?
A: Yes. Both parts share identical electrical specifications (supply voltage, output current, logic configuration) and package format (20-DIP). Direct pin-for-pin substitution is supported.
Q: What is the difference between SN74ACT245N and SN74ACT245NE4?
A: Both are Texas Instruments parts with identical electrical and package specifications. The designation suffix indicates different manufacturing or distribution batches. Functionally, they are equivalent for circuit applications.
Q: Why is CD74ACT245E listed as a substitute if it is RoHS non-compliant?
A: CD74ACT245E meets all electrical and mechanical substitution criteria. RoHS compliance status is provided as a selection factor for applications subject to regulatory requirements. The part remains functionally equivalent.
Q: Does the extended temperature range of CD74ACT245E (-55°C to 125°C) affect compatibility?
A: No. Extended temperature range is a superset capability. Applications designed for -40°C to 85°C operation remain fully compatible. The broader range does not introduce incompatibility.
Q: Are there pin configuration differences between these parts?
A: No. All substitutes use the 20-DIP package with identical pinout. No circuit board modifications are required for substitution.
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