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SN74HC245PWT Equivalent & Substitute Parts
Part Overview
The SN74HC245PWT is a non-inverting bus transceiver logic integrated circuit manufactured by Texas Instruments, housed in a 20-TSSOP surface mount package. This device functions as a 1-element, 8-bit per element transceiver with 3-state output capability, operating across a 2V to 6V supply voltage range. The SN74HC245PWT is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SN74HC245PWT |
| Manufacturer | Texas Instruments |
| Series | 74HC |
| Logic Type | Transceiver, Non-Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Output Type | 3-State |
| Current - Output High, Low | 7.8mA, 7.8mA |
| Voltage - Supply | 2V ~ 6V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 20-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Discontinued at DiGi Electronics |
Substitute Part Grouping Explanation
Substitution of the SN74HC245PWT is determined by strict equivalence across the following critical parameters:
Electrical Equivalence Requirements:
- Logic Type: Transceiver, Non-Inverting
- Number of Elements: 1
- Number of Bits per Element: 8
- Output Type: 3-State
- Current - Output High, Low: 7.8mA, 7.8mA
- Voltage - Supply: 2V ~ 6V
Mechanical Equivalence Requirements:
- Package / Case: 20-TSSOP (0.173", 4.40mm Width)
- Mounting Type: Surface Mount
Compliance Requirements:
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level (MSL): 1 (Unlimited)
Substitute parts are grouped into three categories: Parametric Equivalents (identical electrical and mechanical specifications), Direct Manufacturer Equivalents (alternative manufacturers with identical specifications), and MFR Recommended alternatives (manufacturer-designated replacements with extended operating temperature ranges or automotive qualification).
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements / Bits | Output Type | Current (mA) | Voltage Supply | Temp Range (°C) | Package | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| SN74HC245PWT | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 20-TSSOP | Discontinued |
| SN74HC245APWR | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 20-TSSOP | Active |
| SN74HC245PWR | Texas Instruments | Transceiver, Non-Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 20-TSSOP | Active |
| MC74HC245ADTR2G | onsemi | Transceiver, Non-Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -55 ~ 125 | 20-TSSOP | Active |
| 74HC245PW,112 | Nexperia USA Inc. | Transceiver, Non-Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 125 | 20-TSSOP | Obsolete |
| 74HC245PW,118 | Nexperia USA Inc. | Transceiver, Non-Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 125 | 20-TSSOP | Active |
| 74HC245PW-Q100J | Nexperia USA Inc. | Transceiver, Non-Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 125 | 20-TSSOP | Active |
| MC74HC245ADTG | onsemi | Transceiver, Non-Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -55 ~ 125 | 20-TSSOP | Active |
| MM74HC245AMTC | Fairchild Semiconductor | Transceiver, Non-Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 20-TSSOP | Active |
| MM74HC245AMTCX | Fairchild Semiconductor | Transceiver, Non-Inverting | 1 / 8 | 3-State | 7.8 / 7.8 | 2V ~ 6V | -40 ~ 85 | 20-TSSOP | Active |
Engineering Selection Recommendations
Primary Substitutes (Identical Specifications, Active Status):
SN74HC245APWR and SN74HC245PWR from Texas Instruments are direct parametric equivalents with identical electrical and thermal specifications to the SN74HC245PWT. Both maintain active product status and are available in standard packaging configurations. These represent the lowest-risk substitution path for applications requiring exact thermal and electrical performance matching.
Extended Temperature Range Alternatives:
MC74HC245ADTR2G and MC74HC245ADTG from onsemi provide extended operating temperature range (-55°C to 125°C) while maintaining all core electrical parameters. These alternatives are suitable for applications requiring broader thermal operating margins beyond the original -40°C to 85°C specification.
Nexperia Alternatives:
74HC245PW,118 is the recommended active substitute from Nexperia USA Inc., offering extended temperature range (-40°C to 125°C) with high inventory availability. The 74HC245PW-Q100J variant includes AEC-Q100 automotive qualification for applications requiring automotive-grade components.
Fairchild Semiconductor Alternatives:
MM74HC245AMTC and MM74HC245AMTCX maintain the original thermal specification (-40°C to 85°C) and are available in active status with substantial inventory levels.
Frequently Asked Questions (FAQ)
Q: Can I substitute SN74HC245APWR for SN74HC245PWT in my design?
A: Yes. SN74HC245APWR is a parametric equivalent with identical electrical specifications (2V to 6V supply, 7.8mA output current, -40°C to 85°C operating range) and identical 20-TSSOP package. The primary difference is product status; SN74HC245APWR is active while SN74HC245PWT is discontinued.
Q: What is the difference between the Texas Instruments and onsemi versions?
A: Both manufacturers produce functionally equivalent 74HC245 transceivers in the 20-TSSOP package with identical core electrical specifications. The onsemi variants (MC74HC245ADTR2G, MC74HC245ADTG) offer extended operating temperature range (-55°C to 125°C) compared to the Texas Instruments standard range (-40°C to 85°C). Selection depends on thermal requirements and packaging preference (tape & reel versus tube).
Q: Is the 74HC245PW,118 from Nexperia a direct replacement?
A: Yes, for electrical function. The 74HC245PW,118 maintains all core electrical parameters and 20-TSSOP package compatibility. It offers extended temperature range (-40°C to 125°C) and is in active production status. Packaging differs (Cut Tape & Digi-Reel versus the original configuration), which may affect procurement and handling procedures.
Q: Can I use the automotive-qualified 74HC245PW-Q100J in non-automotive applications?
A: Yes. The 74HC245PW-Q100J meets all standard 74HC245 electrical specifications and AEC-Q100 automotive qualification requirements. Automotive-qualified components are suitable for any application requiring equivalent or higher reliability standards. Availability and cost may differ from standard industrial variants.
Q: What does the extended temperature range (-55°C to 125°C) mean for my application?
A: Extended temperature range variants (MC74HC245ADTR2G, MC74HC245ADTG) operate reliably across a broader thermal envelope than the standard -40°C to 85°C specification. If your application operates within the standard range, either variant is acceptable. Extended range variants provide additional thermal margin for demanding environments.
Q: Are all these parts RoHS3 compliant?
A: All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original SN74HC245PWT specifications.
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