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MAX989ESA-T Equivalent & Substitute Parts
Part Overview
The MAX989ESA-T is a dual-channel general-purpose comparator manufactured by Analog Devices Inc./Maxim Integrated, housed in an 8-SOIC surface-mount package. This device features CMOS push-pull rail-to-rail TTL output architecture with low input offset voltage and minimal input bias current. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The MAX989ESA-T operates across a supply voltage range of 2.5V to 5.5V (single supply) or ±1.25V to ±2.75V (dual supply), with a maximum propagation delay of 450ns and ±3mV hysteresis.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Number of Elements | 2 | Channels |
| Output Type | CMOS, Push-Pull, Rail-to-Rail, TTL | — |
| Voltage - Supply, Single/Dual (±) | 2.5V ~ 5.5V, ±1.25V ~ 2.75V | V |
| Voltage - Input Offset (Max) | 5mV @ 5.5V | mV |
| Current - Input Bias (Max) | 1pA @ 5.5V | pA |
| Current - Quiescent (Max) | 24µA | µA |
| CMRR, PSRR (Typ) | 80dB CMRR, 80dB PSRR | dB |
| Propagation Delay (Max) | 450ns | ns |
| Hysteresis | ±3mV | mV |
| Operating Temperature | -40°C ~ 85°C | °C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the MAX989ESA-T is determined by strict alignment across the following critical parameters:
Primary Substitution Criteria:
- Number of elements: 2 channels required
- Output type: CMOS push-pull rail-to-rail TTL architecture
- Supply voltage range: Minimum 2.5V single supply or ±1.25V dual supply capability
- Input offset voltage: Maximum 5mV
- Input bias current: Maximum 1pA
- Quiescent current: Maximum 24µA
- CMRR/PSRR: Minimum 80dB
- Propagation delay: Maximum 450ns
- Package: 8-SOIC surface mount
- Operating temperature: Minimum -40°C to 85°C range
Direct Equivalent: MAX989ESA+T matches all electrical and mechanical specifications identically, differing only in packaging format (Tape & Reel vs. tube) and product status (Active vs. Obsolete).
Parametric Equivalent: MAX985ESA+T provides identical electrical performance but contains only 1 comparator element instead of 2. This part is suitable only for applications requiring single-channel operation.
Manufacturer-Recommended Alternatives: ADCMP392ARZ, ADCMP392ARZ-RL7, ALD2302ASAL, ALD2302SAL, AZV3002S-13, BU7232F-E2, BU7232SF-E2, and BU7252SF-E2 are qualified substitutes that meet the core electrical requirements while introducing variations in secondary parameters such as propagation delay, hysteresis, quiescent current, and operating temperature range.
Parameter Comparison
| Parameter | MAX989ESA-T (Main) | MAX989ESA+T | MAX985ESA+T | ADCMP392ARZ | ALD2302ASAL | AZV3002S-13 | BU7232SF-E2 | BU7252SF-E2 |
|---|---|---|---|---|---|---|---|---|
| Number of Elements | 2 | 2 | 1 | 2 | 2 | 2 | 2 | 2 |
| Output Type | CMOS, Push-Pull, Rail-to-Rail, TTL | CMOS, Push-Pull, Rail-to-Rail, TTL | CMOS, Push-Pull, Rail-to-Rail, TTL | Rail-to-Rail | CMOS, NMOS, Push-Pull, TTL | Push-Pull | Push-Pull | Push-Pull |
| Voltage - Supply, Single/Dual (±) | 2.5V ~ 5.5V, ±1.25V ~ 2.75V | 2.5V ~ 5.5V, ±1.25V ~ 2.75V | 2.5V ~ 5.5V, ±1.25V ~ 2.75V | 2.3V ~ 5.5V | 4V ~ 10V, ±2V ~ 5V | 1.6V ~ 5.5V | 1.8V ~ 5.5V, ±0.9V ~ 2.75V | 1.8V ~ 5.5V, ±0.9V ~ 2.75V |
| Voltage - Input Offset (Max) | 5mV @ 5.5V | 5mV @ 5.5V | 5mV @ 5.5V | 5mV | 1mV @ 5V | 30mV | 11mV @ 3V | 11mV @ 3V |
| Current - Input Bias (Max) | 1pA @ 5.5V | 1pA @ 5.5V | 1pA @ 5.5V | 0.03µA | 0.001µA @ 5V | 1pA | 1pA @ 3V | 1pA @ 3V |
| Current - Quiescent (Max) | 24µA | 24µA | 24µA | 29.3µA | 500µA | 9µA (Typ) | 25µA | 65µA |
| CMRR, PSRR (Typ) | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 74dB CMRR, 80dB PSRR | — | 70dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR |
| Propagation Delay (Max) | 450ns | 450ns | 450ns | 9.7µs | — | 0.8µs | 1.7µs | 550ns |
| Hysteresis | ±3mV | ±3mV | ±3mV | 4mV | — | 13mV | — | — |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 125°C | 0°C ~ 70°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 105°C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.173", 4.40mm Width) | 8-SOIC (0.173", 4.40mm Width) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Replacement (Preferred): MAX989ESA+T is the primary substitute for MAX989ESA-T. Both parts are electrically and mechanically identical, with MAX989ESA+T currently in active production status with 17,129 units in stock. The only difference is packaging format (Tape & Reel vs. tube). This part requires no circuit redesign and maintains full compatibility with existing PCB layouts and assembly processes.
Single-Channel Alternative: MAX985ESA+T is suitable only for applications where single-channel comparator functionality is sufficient. This part maintains identical electrical specifications to the main part but provides only one comparator element, reducing component cost for single-channel designs.
Extended Temperature Range Option: ADCMP392ARZ and ADCMP392ARZ-RL7 extend the operating temperature range to -40°C to 125°C, accommodating industrial and automotive applications requiring higher temperature performance. These parts introduce a longer propagation delay (9.7µs vs. 450ns) and slightly higher quiescent current (29.3µA vs. 24µA), which may impact timing-critical applications.
Low-Voltage Supply Option: AZV3002S-13 supports supply voltages as low as 1.6V, enabling battery-powered and ultra-low-voltage applications. This part exhibits higher input offset voltage (30mV vs. 5mV) and increased hysteresis (13mV vs. ±3mV), which may affect precision threshold detection.
Extended Temperature and Faster Propagation: BU7252SF-E2 combines extended operating temperature (-40°C to 105°C) with faster propagation delay (550ns vs. 450ns), offering a balance between thermal performance and speed. Quiescent current is elevated to 65µA.
Standard Industrial Range: BU7232SF-E2 maintains the standard -40°C to 85°C operating range with 1.7µs propagation delay and 25µA quiescent current, providing a cost-effective alternative with slightly relaxed timing specifications.
All substitute parts listed are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, ensuring compatibility with standard manufacturing and storage practices.
Frequently Asked Questions (FAQ)
Q: Can MAX985ESA+T replace MAX989ESA-T in all applications?
A: No. MAX985ESA+T contains only one comparator element versus two in the MAX989ESA-T. Use this part only in designs requiring single-channel operation. Dual-channel applications require MAX989ESA+T or other dual-element alternatives.
Q: What is the primary difference between MAX989ESA-T and MAX989ESA+T?
A: Both parts are electrically and mechanically identical. The difference is packaging format: MAX989ESA-T is supplied in tube packaging, while MAX989ESA+T is supplied in Tape & Reel format. MAX989ESA+T is currently in active production with higher inventory availability.
Q: Can ADCMP392ARZ be used in place of MAX989ESA-T in timing-critical applications?
A: ADCMP392ARZ has a propagation delay of 9.7µs compared to 450ns for MAX989ESA-T. This 21-fold increase in delay may violate timing requirements in high-speed comparator circuits. Verify propagation delay specifications against your application requirements before substitution.
Q: Which substitute part supports the lowest supply voltage?
A: AZV3002S-13 supports supply voltages as low as 1.6V, making it suitable for battery-powered and ultra-low-voltage applications. However, this part exhibits higher input offset voltage (30mV) and hysteresis (13mV), which may reduce precision in threshold detection compared to MAX989ESA-T.
Q: Are all substitute parts RoHS compliant?
A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings, meeting standard environmental and manufacturing requirements.
Q: What is the impact of package width differences between 0.154" and 0.173"?
A: BU7232SF-E2 and BU7252SF-E2 use 8-SOIC packages with 0.173" width versus 0.154" width for MAX989ESA-T. This 0.019" difference may affect PCB layout compatibility. Verify footprint dimensions and PCB design rules before substitution to ensure proper solder joint formation and thermal management.
Q: Which substitute offers the widest operating temperature range?
A: ADCMP392ARZ and ADCMP392ARZ-RL7 support -40°C to 125°C, extending 40°C above the MAX989ESA-T range. BU7252SF-E2 supports -40°C to 105°C, providing a 20°C extension. Select based on specific thermal environment requirements.
Q: Can ALD2302ASAL be used in 2.5V supply applications?
A: No. ALD2302ASAL requires a minimum supply voltage of 4V (single supply) or ±2V (dual supply), making it incompatible with 2.5V single-supply designs. This part is suitable only for 4V and higher supply voltage applications.
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