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74LCX126M Equivalent & Substitute Parts
Part Overview
The 74LCX126M is a non-inverting buffer IC manufactured by onsemi, featuring 4 elements with 1 bit per element and 3-state output capability. This device operates across a 2V to 3.6V supply voltage range and is housed in a 14-SOIC package. The 74LCX126M is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 74LCX126M |
| Manufacturer | onsemi |
| Logic Type | Buffer, Non-Inverting |
| Number of Elements | 4 |
| Number of Bits per Element | 1 |
| Output Type | 3-State |
| Current - Output High, Low | 24mA, 24mA |
| Voltage - Supply | 2V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the 74LCX126M is determined by the following critical parameters:
- Logic Type: Buffer, Non-Inverting
- Number of Elements: 4
- Number of Bits per Element: 1
- Output Type: 3-State
- Current - Output High, Low: 24mA, 24mA
- Package / Case: 14-SOIC (0.154", 3.90mm Width)
- Mounting Type: Surface Mount
Substitute parts must maintain identical functional specifications (4-element non-inverting buffer with 3-state output and 24mA output current capability) and physical package dimensions. Supply voltage ranges and operating temperature ranges may extend beyond the original specification while remaining compatible. All substitute parts listed are active products with current manufacturing status, providing long-term availability advantages over the obsolete 74LCX126M.
Parameter Comparison
| Part Number | Manufacturer | Logic Type | Elements | Output Type | Current (mA) | Supply Voltage | Temp Range | Package | Status |
|---|---|---|---|---|---|---|---|---|---|
| 74LCX126M | onsemi | Buffer, Non-Inverting | 4 | 3-State | 24, 24 | 2V ~ 3.6V | -40°C ~ 85°C | 14-SOIC (0.154") | Obsolete |
| MC74LCX125DG | onsemi | Buffer, Non-Inverting | 4 | 3-State | 24, 24 | 2V ~ 3.6V | -40°C ~ 85°C | 14-SOIC (0.154") | Active |
| 74LVC126AD,118 | Nexperia USA Inc. | Buffer, Non-Inverting | 4 | 3-State | 24, 24 | 1.2V ~ 3.6V | -40°C ~ 125°C | 14-SOIC (0.154") | Active |
| 74LVC126AD-Q100J | Nexperia USA Inc. | Buffer, Non-Inverting | 4 | 3-State | 24, 24 | 1.2V ~ 3.6V | -40°C ~ 125°C | 14-SOIC (0.154") | Active |
| SN74LVC126AD | Texas Instruments | Buffer, Non-Inverting | 4 | 3-State | 24, 24 | 1.65V ~ 3.6V | -40°C ~ 125°C | 14-SOIC (0.154") | Active |
| SN74LVC126ADR | Texas Instruments | Buffer, Non-Inverting | 4 | 3-State | 24, 24 | 1.65V ~ 3.6V | -40°C ~ 125°C | 14-SOIC (0.154") | Active |
| SN74LVC126ADT | Texas Instruments | Buffer, Non-Inverting | 4 | 3-State | 24, 24 | 1.65V ~ 3.6V | -40°C ~ 125°C | 14-SOIC (0.154") | Active |
| SN74LVC126ANS | Texas Instruments | Buffer, Non-Inverting | 4 | 3-State | 24, 24 | 1.65V ~ 3.6V | -40°C ~ 125°C | 14-SOIC (0.209") | Active |
| SN74LVC126ANSR | Texas Instruments | Buffer, Non-Inverting | 4 | 3-State | 24, 24 | 1.65V ~ 3.6V | -40°C ~ 125°C | 14-SOIC (0.209") | Active |
| SN74LVC126AQDRG4Q1 | Texas Instruments | Buffer, Non-Inverting | 4 | 3-State | 24, 24 | 1.65V ~ 3.6V | -40°C ~ 125°C | 14-SOIC (0.154") | Active |
| SN74LVC126AQDRQ1 | Texas Instruments | Buffer, Non-Inverting | 4 | 3-State | 24, 24 | 1.65V ~ 3.6V | -40°C ~ 125°C | 14-SOIC (0.154") | Active |
Engineering Selection Recommendations
All listed substitute parts maintain functional and electrical equivalence to the 74LCX126M. Selection should prioritize active product status for long-term availability and supply chain stability.
MC74LCX125DG from onsemi provides the closest electrical match, maintaining the original 2V to 3.6V supply voltage specification while offering active product status and improved availability.
The 74LVC series parts from Nexperia and Texas Instruments extend the supply voltage range to 1.2V or 1.65V minimum and expand the operating temperature range to 125°C maximum, providing enhanced performance margins in applications requiring lower voltage operation or extended temperature ranges.
For automotive applications requiring AEC-Q100 qualification, 74LVC126AD-Q100J (Nexperia) and SN74LVC126AQDRG4Q1 or SN74LVC126AQDRQ1 (Texas Instruments) are available.
Package considerations: SN74LVC126ANS and SN74LVC126ANSR feature a wider 14-SOIC package (0.209" width) compared to the standard 0.154" width. Verify PCB layout compatibility before selection.
Frequently Asked Questions (FAQ)
Q: Can I directly replace 74LCX126M with MC74LCX125DG?
A: Yes. Both parts share identical electrical specifications (2V to 3.6V supply, 24mA output current, 4-element non-inverting buffer with 3-state output) and the same 14-SOIC (0.154" width) package. MC74LCX125DG is an active product offering superior availability.
Q: What is the difference between 74LVC and 74LCX series?
A: Both are non-inverting buffer ICs with identical functional specifications for this application. The 74LVC series extends the minimum supply voltage to 1.2V or 1.65V and maximum operating temperature to 125°C, compared to the 74LCX specification of 2V minimum and 85°C maximum. The 74LVC series provides broader operational margins.
Q: Are SN74LVC126ANS and SN74LVC126ANSR pin-compatible with 74LCX126M?
A: Both parts are functionally equivalent with identical pin counts and logic functions. However, the package width differs: SN74LVC126ANS and SN74LVC126ANSR use 14-SOIC (0.209" width) versus the standard 14-SOIC (0.154" width) of 74LCX126M. Verify PCB footprint compatibility before substitution.
Q: Which substitute part offers the best long-term availability?
A: All listed substitute parts carry active product status. Texas Instruments SN74LVC126 variants and Nexperia 74LVC126 variants maintain broad market distribution. Inventory levels vary; consult current distributor stock for specific procurement timelines.
Q: Can I use automotive-grade parts (AEC-Q100) in non-automotive applications?
A: Yes. Automotive-qualified parts (74LVC126AD-Q100J, SN74LVC126AQDRG4Q1, SN74LVC126AQDRQ1) meet or exceed standard commercial specifications and are suitable for any application within their electrical and thermal ratings.
Q: What is the impact of extended temperature range on my design?
A: The 74LVC series extends maximum operating temperature from 85°C to 125°C. This provides additional thermal margin but does not require design changes. Designs operating within the original 74LCX126M temperature range (-40°C to 85°C) remain fully compatible with 74LVC substitutes.
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