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MAX4645EUK-T Equivalent & Substitute Parts
Part Overview
The MAX4645EUK-T is a single-circuit SPST (Single Pole Single Throw) analog switch IC manufactured by Analog Devices Inc./Maxim Integrated, housed in a SOT-23-5 surface mount package. This component features a 2.5Ohm on-state resistance and operates across a 1.8V to 5V single supply voltage range, making it suitable for low-voltage signal switching applications.
The MAX4645EUK-T carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for systems utilizing this interface component.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Switch Circuit Type | SPST - NO (Normally Open) |
| Number of Circuits | 1 |
| Multiplexer/Demultiplexer Configuration | 1:1 |
| On-State Resistance (Max) | 2.5Ohm |
| Channel-to-Channel Matching (ΔRon) | 100mOhm |
| Voltage - Supply, Single (V+) | 1.8V ~ 5V |
| Switch Time (Ton, Toff) (Max) | 15ns, 10ns |
| Charge Injection | 5pC |
| Channel Capacitance (CS(off), CD(off)) | 17pF, 17pF |
| Current - Leakage (IS(off)) (Max) | 250pA |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | SC-74A, SOT-753 |
| Supplier Device Package | SOT-23-5 |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the MAX4645EUK-T is determined by strict alignment of the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Switch circuit type: SPST - NO
- Multiplexer/Demultiplexer configuration: 1:1
- Number of circuits: 1
- Package type: SOT-23-5 or SC-74A (SOT-753)
- Operating temperature range: Minimum -40°C to 85°C
- Supply voltage compatibility: Overlap with 1.8V ~ 5V range
Secondary Compatibility Factors:
- On-state resistance: Parts with ≤2.5Ohm maximum resistance maintain signal integrity
- Switch timing: Parts with ≤15ns Ton and ≤10ns Toff preserve switching performance
- Leakage current: Parts with ≤250pA maintain low-power operation
- Channel capacitance: Parts with ≤17pF maintain signal fidelity
Substitute parts are grouped into two categories:
Category A - Direct Parametric Equivalents: Parts matching all primary criteria with identical or superior electrical performance (MAX4645EUK+T, ADG701BRJZ-REEL7, ADG701BRJZ-500RL7).
Category B - Functional Equivalents with Trade-offs: Parts meeting primary criteria but with modified electrical characteristics that require application-level verification (74AHC1G66GV series, 74LVC1G66GV,125). These parts feature higher on-state resistance (10Ohm to 95Ohm) and may require circuit redesign for impedance-sensitive applications.
Parameter Comparison
| Part Number | Manufacturer | On-State Resistance (Max) | Supply Voltage (V+) | Switch Time Ton/Toff (Max) | Leakage Current (Max) | Operating Temp | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| MAX4645EUK-T | Analog Devices Inc./Maxim | 2.5Ohm | 1.8V ~ 5V | 15ns, 10ns | 250pA | -40°C ~ 85°C | SOT-23-5 | Obsolete | RoHS non-compliant |
| MAX4645EUK+T | Analog Devices Inc./Maxim | 2.5Ohm | 1.8V ~ 5V | 15ns, 10ns | 250pA | -40°C ~ 85°C | SOT-23-5 | Active | ROHS3 Compliant |
| ADG701BRJZ-REEL7 | Analog Devices Inc. | 3Ohm | 1.8V ~ 5V | 12ns, 8ns (Typ) | 10pA (Typ) | -40°C ~ 85°C | SOT-23-5 | Active | ROHS3 Compliant |
| ADG701BRJZ-500RL7 | Analog Devices Inc. | 3Ohm | 1.8V ~ 5V | 12ns, 8ns (Typ) | 10pA (Typ) | -40°C ~ 85°C | SOT-23-5 | Active | ROHS3 Compliant |
| 74AHC1G66GV,125 | Nexperia USA Inc. | 22Ohm | 2V ~ 5.5V | 11ns, 11ns | 100nA | -40°C ~ 125°C | SC-74A | Active | ROHS3 Compliant |
| 74AHC1G66GV-Q100H | Nexperia USA Inc. | 22Ohm | 2V ~ 5.5V | 11ns, 11ns | 100nA | -40°C ~ 125°C | SC-74A | Active | ROHS3 Compliant |
| 74AHCT1G66GV,125 | Nexperia USA Inc. | 22Ohm | 4.5V ~ 5.5V | 11ns, 11ns | 100nA | -40°C ~ 125°C | SC-74A | Active | ROHS3 Compliant |
| 74HC1G66GV,125 | Nexperia USA Inc. | 80Ohm | 2V ~ 10V | 20ns, 20ns | 1µA | -40°C ~ 125°C | SC-74A | Active | ROHS3 Compliant |
| 74HCT1G66GV,125 | Nexperia USA Inc. | 95Ohm | 4.5V ~ 5.5V | 30ns, 44ns | 1µA | -40°C ~ 125°C | SC-74A | Active | ROHS3 Compliant |
| 74HCT1G66GV-Q100H | Nexperia USA Inc. | 95Ohm | 4.5V ~ 5.5V | 30ns, 44ns | 1µA | -40°C ~ 125°C | SC-74A | Active | ROHS3 Compliant |
| 74LVC1G66GV,125 | Nexperia USA Inc. | 10Ohm | 1.65V ~ 5.5V | 4.2ns, 5ns | 5µA | -40°C ~ 125°C | SC-74A | Active | ROHS3 Compliant |
Engineering Selection Recommendations
For Direct Replacement (Recommended Primary Path):
MAX4645EUK+T is the preferred substitute. It maintains identical electrical specifications and package configuration as the MAX4645EUK-T while offering Active product status and ROHS3 compliance. This part requires no circuit modifications and provides the shortest qualification path.
For Low-Leakage Applications:
ADG701BRJZ-REEL7 and ADG701BRJZ-500RL7 offer superior leakage performance (10pA typical versus 250pA maximum) and faster switching times (12ns/8ns typical versus 15ns/10ns maximum). Both maintain SOT-23-5 packaging and 1.8V to 5V supply compatibility. These parts are suitable for battery-powered or ultra-low-power signal switching applications.
For Extended Temperature Range and Automotive Applications:
74AHC1G66GV-Q100H and 74HCT1G66GV-Q100H provide AEC-Q100 automotive qualification and extended operating temperature to 125°C. The 74AHC1G66GV-Q100H variant supports the full 2V to 5.5V supply range, while 74HCT1G66GV-Q100H operates within 4.5V to 5.5V. Both require circuit evaluation due to increased on-state resistance (22Ohm and 95Ohm respectively).
For Broadest Supply Voltage Compatibility:
74LVC1G66GV,125 supports the widest supply range (1.65V to 5.5V) and offers the fastest switching performance (4.2ns/5ns). The 10Ohm on-state resistance provides a middle ground between low-resistance and standard logic families. This part is suitable for mixed-voltage systems and high-speed switching applications.
For Cost-Optimized Substitution:
74AHC1G66GV,125 and 74HC1G66GV,125 provide the most economical alternatives with extensive inventory availability. These parts sacrifice on-state resistance performance but maintain SPST-NO functionality and SC-74A packaging compatibility.
Frequently Asked Questions (FAQ)
Q: Can I use 74AHC1G66GV,125 as a direct replacement for MAX4645EUK-T?
A: Functional substitution is possible with circuit-level verification. The 74AHC1G66GV,125 maintains SPST-NO switching topology and SC-74A package compatibility. However, the 22Ohm on-state resistance (versus 2.5Ohm) introduces 8.8x higher impedance. Applications sensitive to signal attenuation, impedance matching, or power dissipation require redesign analysis. Supply voltage range differs (2V to 5.5V versus 1.8V to 5V), limiting low-voltage operation.
Q: What is the difference between MAX4645EUK-T and MAX4645EUK+T?
A: Both parts are electrically identical with matching specifications. The primary difference is product status and compliance: MAX4645EUK-T is Obsolete and RoHS non-compliant, while MAX4645EUK+T is Active and ROHS3 compliant. The "+T" suffix indicates the newer, compliant variant. MAX4645EUK+T is the recommended upgrade path.
Q: Are ADG701BRJZ-REEL7 and ADG701BRJZ-500RL7 interchangeable?
A: Yes. Both parts are identical in electrical specifications and package type (SOT-23-5). The difference is packaging format: REEL7 indicates standard tape-and-reel packaging, while 500RL7 specifies a 500-unit reel configuration. Selection depends on procurement and assembly requirements.
Q: Which substitute part offers the best leakage current performance?
A: ADG701BRJZ-REEL7 and ADG701BRJZ-500RL7 provide the lowest leakage current at 10pA typical, compared to 250pA maximum for the MAX4645EUK-T. This 25x improvement is critical for battery-powered applications and precision analog signal switching where leakage-induced errors must be minimized.
Q: Can I use 74LVC1G66GV,125 in a 1.8V supply system?
A: No. The 74LVC1G66GV,125 minimum supply voltage is 1.65V, which falls below the 1.8V minimum of the MAX4645EUK-T. While 1.65V is marginally lower, operation at exactly 1.8V may not meet the part's specified performance envelope. For guaranteed 1.8V operation, use MAX4645EUK+T, ADG701BRJZ-REEL7, or ADG701BRJZ-500RL7.
Q: What is the significance of AEC-Q100 qualification on 74AHC1G66GV-Q100H and 74HCT1G66GV-Q100H?
A: AEC-Q100 qualification indicates automotive-grade reliability testing and stress screening. These parts meet automotive industry standards for temperature cycling, electrostatic discharge, and long-term reliability. Selection of AEC-Q100 parts is mandatory for automotive applications and recommended for mission-critical systems requiring enhanced reliability assurance.
Q: Why does 74AHCT1G66GV,125 have a narrower supply voltage range than 74AHC1G66GV,125?
A: The 74AHCT variant is TTL-input compatible, requiring higher minimum supply voltage (4.5V) to maintain proper logic threshold levels. The 74AHC variant uses CMOS inputs and operates across the broader 2V to 5.5V range. Selection depends on input signal logic family compatibility in your system.
Q: Is package compatibility guaranteed between SOT-23-5 and SC-74A?
A: No. SOT-23-5 and SC-74A (SOT-753) are distinct package types with different pin counts and footprints. MAX4645EUK-T uses SOT-23-5 (5 pins), while most Nexperia 74-series substitutes use SC-74A (6 pins). PCB layout and schematic modifications are required when switching between these packages. ADG701 variants maintain SOT-23-5 compatibility for direct footprint substitution.
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