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NLAST4599DFT2 Equivalent & Substitute Parts Reference
Part Overview
The NLAST4599DFT2 is a single-circuit SPDT (Single Pole Double Throw) analog switch IC manufactured by onsemi, designed for 2:1 multiplexing applications with 25Ohm on-state resistance. This component operates across a 2V to 5.5V single supply voltage range and delivers switching performance suitable for signal routing in analog and mixed-signal systems.
The NLAST4599DFT2 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support long-term product availability for applications currently using this component.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Switch Circuit Type | SPDT |
| Multiplexer/Demultiplexer Configuration | 2:1 |
| Number of Circuits | 1 |
| On-State Resistance (Max) | 25Ohm |
| Channel-to-Channel Matching (ΔRon) | 2Ohm |
| Supply Voltage Range (Single) | 2V ~ 5.5V |
| Switch Time (Ton/Toff Max) | 14ns / 8ns |
| -3dB Bandwidth | 200MHz |
| Charge Injection | 3pC |
| Channel Capacitance (CS(off)/CD(off)) | 10pF / 10pF |
| Leakage Current (IS(off) Max) | 1nA |
| Operating Temperature Range | -55°C ~ 125°C |
| Package Type | 6-TSSOP, SC-88, SOT-363 |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS non-compliant |
| MSL Rating | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the NLAST4599DFT2 is determined by the following critical parameters:
Functional Requirements:
- Switch circuit type must be SPDT
- Multiplexer configuration must be 2:1
- Single circuit count
Electrical Compatibility:
- On-state resistance must not exceed 25Ohm (lower values are acceptable and improve performance)
- Supply voltage range must encompass or exceed 2V ~ 5.5V
- Switch timing (Ton/Toff) must meet or exceed performance specifications
- Bandwidth must support the intended signal frequency range
Physical Compatibility:
- Package must be compatible with 6-TSSOP, SC-88, or SOT-363 footprints
- Surface mount mounting type required
- MSL rating of 1 or equivalent
Compliance Considerations:
- RoHS compliance status and product lifecycle status are secondary factors that may influence selection based on application requirements
Parameter Comparison
| Parameter | NLAST4599DFT2 | NLAST4599DFT2G | PI5A4599BCEX |
|---|---|---|---|
| Manufacturer | onsemi | onsemi | Diodes Incorporated |
| Switch Circuit | SPDT | SPDT | SPDT |
| Multiplexer Configuration | 2:1 | 2:1 | 2:1 |
| Number of Circuits | 1 | 1 | 1 |
| On-State Resistance (Max) | 25Ohm | 25Ohm | 11Ohm |
| Channel-to-Channel Matching (ΔRon) | 2Ohm | 2Ohm | 150mOhm |
| Supply Voltage Range (Single) | 2V ~ 5.5V | 2V ~ 5.5V | 1.6V ~ 6V |
| Switch Time Ton (Max) | 14ns | 14ns | 15ns |
| Switch Time Toff (Max) | 8ns | 8ns | 7ns |
| -3dB Bandwidth | 200MHz | 200MHz | 350MHz |
| Charge Injection | 3pC | 3pC | 5pC |
| Channel Capacitance (CS(off)) | 10pF | 10pF | 2.5pF |
| Leakage Current (IS(off) Max) | 1nA | 1nA | 100nA |
| Operating Temperature Range | -55°C ~ 125°C | -55°C ~ 125°C | -40°C ~ 85°C |
| Package Type | 6-TSSOP, SC-88, SOT-363 | 6-TSSOP, SC-88, SOT-363 | 6-TSSOP, SC-88, SOT-363 |
| Product Status | Obsolete | Obsolete | Last Time Buy |
| RoHS Status | RoHS non-compliant | RoHS3 Compliant | RoHS3 Compliant |
Engineering Selection Recommendations
NLAST4599DFT2G (Direct Equivalent)
The NLAST4599DFT2G is a direct functional equivalent manufactured by onsemi with identical electrical specifications. The primary distinction is packaging format (Tape & Reel versus bulk) and RoHS3 compliance status. This part is recommended for applications requiring RoHS compliance or when higher inventory availability is beneficial. Both parts share the same obsolete product status.
PI5A4599BCEX (Performance-Enhanced Alternative)
The PI5A4599BCEX from Diodes Incorporated provides superior electrical performance in several parameters: on-state resistance is reduced to 11Ohm (56% lower than the original 25Ohm specification), channel-to-channel matching is improved to 150mOhm, and bandwidth is increased to 350MHz. The supply voltage range is expanded to 1.6V ~ 6V, providing greater flexibility for low-voltage applications.
This part carries Last Time Buy status and RoHS3 compliance. The operating temperature range is narrower (-40°C ~ 85°C versus -55°C ~ 125°C), which may be a limiting factor for extended temperature applications. Leakage current is higher at 100nA compared to 1nA, which may impact low-power or high-impedance signal applications.
Selection between these substitutes depends on application-specific requirements: choose NLAST4599DFT2G for direct replacement with identical specifications and RoHS compliance, or PI5A4599BCEX when improved on-state resistance, bandwidth, and supply voltage range provide design advantages that offset the narrower temperature range and higher leakage current.
Frequently Asked Questions (FAQ)
Q: Can the PI5A4599BCEX replace the NLAST4599DFT2 in all applications?
A: The PI5A4599BCEX is functionally compatible for most applications due to identical switch circuit topology and package compatibility. However, verify two critical parameters: (1) Operating temperature range—the PI5A4599BCEX operates only to -40°C minimum versus -55°C for the original part, and (2) Leakage current—at 100nA maximum versus 1nA, which may affect high-impedance signal paths or low-power designs. The improved on-state resistance (11Ohm versus 25Ohm) and expanded supply voltage range (1.6V ~ 6V) are generally advantageous.
Q: What is the difference between NLAST4599DFT2 and NLAST4599DFT2G?
A: Both parts are manufactured by onsemi with identical electrical and functional specifications. The primary differences are packaging format (NLAST4599DFT2G is supplied in Tape & Reel format) and RoHS compliance status (NLAST4599DFT2G is RoHS3 compliant while the original is non-compliant). Both parts are obsolete. Selection depends on packaging requirements and compliance mandates for your application.
Q: Are all three parts compatible with the same PCB footprint?
A: Yes. All three parts use the 6-TSSOP, SC-88, or SOT-363 package family with identical pin configurations and footprints. PCB layout modifications are not required for substitution.
Q: Which substitute part should I select for a new design?
A: For new designs, the PI5A4599BCEX is the preferred choice due to RoHS3 compliance, improved electrical performance (lower on-state resistance, better channel matching, higher bandwidth), and Last Time Buy status providing extended availability. The NLAST4599DFT2G is suitable if your design specifically requires the original 25Ohm on-state resistance specification or the extended -55°C to 125°C temperature range.
Q: How does the lower on-state resistance of the PI5A4599BCEX affect circuit design?
A: Lower on-state resistance (11Ohm versus 25Ohm) reduces signal attenuation and power dissipation in the switch element. This generally improves signal integrity and reduces thermal effects. No circuit redesign is required; the PI5A4599BCEX will perform as a drop-in replacement with enhanced performance characteristics.
Q: What is the significance of the narrower operating temperature range in the PI5A4599BCEX?
A: The PI5A4599BCEX operates from -40°C to 85°C, compared to -55°C to 125°C for the original part. If your application requires operation below -40°C or above 85°C, the PI5A4599BCEX is not suitable. For standard industrial and commercial temperature ranges, this specification is typically adequate.
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