Integrated PLL with VCO for RF local oscillators
The Texas Instruments LMX2531LQ1742/NOPB is a PLL frequency synthesizer with an integrated VCO. It accepts a clock input and delivers a CMOS output up to 1.866 GHz.
Texas Instruments LMX2531LQ1742/NOPB PLL Frequency
MPNLMX2531LQ1742/NOPB
End of Life
Texas Instruments LMX2531LQ1742/NOPB, PLL Frequency Synthesizer (RF), 1.866 GHz max, CMOS output, 2.8V~3.2V supply, -40°C~85°C, 36-WQFN (6x6), Surface Mount.
$13.64Ref. price · indicative, final on quote
Packaging36-WFQFN Exposed Pad
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Type | Frequency Synthesizer (RF) |
| Mounting | Surface Mount |
| Supply voltage | 2.8V ~ 3.2V |
| Frequency - max | 1.866GHz |
| Operating temperature | -40°C ~ 85°C |
| PLL | Yes |
| Input | Clock |
| Output | CMOS |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Case | 36-WFQFN Exposed Pad |
| Divider (Multiplier) | Yes/No |
| Number of circuits | 1 |
| Ratio - Input:Output | 2:2 |
| Differential - Input:Output | No/No |
Product details
Frequently asked questions
What is the frequency range of LMX2531LQ1742/NOPB?
The maximum output frequency is 1.866 GHz. It accepts a clock input and delivers a CMOS output. The part is a PLL frequency synthesizer with integrated VCO, so the lower frequency limit depends on the reference clock and divider settings rather than a specified floor.
Is LMX2531LQ1742/NOPB compatible with 3.3V supply?
Yes, the supply range is 2.8V to 3.2V, which includes a standard 3.3V rail. The 100 mV headroom above 3.2V is tight — the rail should be regulated within ±2% to stay inside the window. A clean 3.3V LDO feeding the part with local decoupling is the typical approach.
What is the equivalent part for LMX2531LQ1742/NOPB?
The CD74HCT7046AE is a through-hole PLL from a different series (74HCT, 38 MHz max, -55°C to 125°C) — not a functional equivalent for RF synthesis at 1.866 GHz. No direct pin-compatible second source is listed in the record. For a dual-source strategy, look at other LMX2531 family variants with the same 36-WQFN footprint and different frequency bands.
What is the operating temperature of LMX2531LQ1742/NOPB?
Rated for -40°C to 85°C, the industrial temperature range. Suitable for outdoor telecom enclosures, base stations, and factory automation where ambient temperatures stay within that span.