Maxim MAX9108EUD+, quad general-purpose comparator, 25 ns propagation delay, 2 mV hysteresis, TTL output, 4.5 V to 5.5 V supply, -40°C to 85°C, 14-TSSOP.
| Parameter | Value |
|---|---|
| Type | General Purpose |
| Output type | TTL |
| Mounting | Surface Mount |
| Voltage - input offset | 1.6mV @ 5V |
| Voltage - supply, single (Dual (±)) | 4.5V ~ 5.5V |
| Current - quiescent | 700µA |
| Current - input bias | 0.125µA @ 5V |
| Operating temperature | -40°C ~ 85°C |
| Package | Tube |
| Hysteresis | 2mV |
| Case | 14-TSSOP (0.173\", 4.40mm Width) |
| CMRR, PSRR | 86.02dB CMRR, 86.02dB PSRR |
| Number of elements | 4 |
| Propagation delay | 25ns |
The 14-TSSOP package (0.173" body width, 4.40 mm) is a common footprint shared with many logic and comparator parts, so board layout reuse across variants is straightforward. Surface-mount only — no through-hole option.
No last-time-buy notice, no NRND flag.
No — the MAX9108EUD+ is not a direct pin-for-pin replacement for the LM339. The LM339 uses a 14-DIP or 14-SOIC package with open-collector outputs, while the MAX9108EUD+ uses a 14-TSSOP package with TTL push-pull outputs. The 25 ns propagation delay of the MAX9108EUD+ is significantly faster than the LM339's typical 300 ns, so the electrical characteristics differ enough that a board redesign would be required. The LM339 also operates from a wider supply range (2 V to 36 V or ±18 V) versus the MAX9108EUD+'s 4.5 V to 5.5 V single-supply range.
The maximum propagation delay is 25 ns. That is the time from input crossing the threshold to the TTL output changing state. For high-speed comparator applications like overcurrent detection or zero-crossing, this delay is short enough to avoid adding significant latency to the control loop.
Within the same Maxim family, the MAX9109 is a similar quad comparator with the same 14-TSSOP footprint and TTL outputs, but it offers a wider supply range (2.7 V to 5.5 V). The MAX9108EUD+ is the 4.5 V to 5.5 V variant. For a direct pin-compatible swap without changing the board layout, the MAX9109EUD+ is the closest alternative, though the supply voltage minimum differs. No other manufacturer's quad comparator in 14-TSSOP with TTL outputs and 25 ns delay is a guaranteed pin-compatible second source without layout verification.