MC13851EPR2 - 2.5GHz Low Noise Amplifier w/ Bypass | NXP
MPN: MC13851EPR2 ✗ סוף ייצורMC13851EPR2 סקירה
An RF Low Noise Amplifier (LNA) is a critical building block at the very front of any receiver chain, placed immediately after the antenna and the filter/pre-selector. Its job is to add as little noise as possible to the weakest incoming signals so that downstream stages (mixers, ADCs, baseband) can extract information from them. LNAs must simultaneously provide high gain, low Noise Figure (NF), high linearity (IIP3 / OIP3), and stable 50-ohm input/output impedance across the band of interest - trade-offs that the MC13851 is engineered to balance.
Key electrical highlights of the MC13851EPR2 include a typical gain of 16.4 dB across its 1GHz to 2.5GHz operating range, a low-noise figure that makes it suitable as the first gain stage in a 2.4 GHz ISM / Wi-Fi / LTE / cellular band receiver, and an integrated bypass mode that improves linearity (IIP3) at higher input levels. The MLPD-8 (2x2 mm) package combines an exposed thermal pad with a tiny footprint, suitable for densely populated RF PCB layouts. The single 3 V rail and integrated bias chain simplify power-tree design.
Architecturally the part uses a single-transistor silicon bipolar input stage with on-chip matching networks so that the user does not need to provide external LC matching for nominal operation. The bypass switch is implemented in parallel with the LNA core; when the receiver detects a strong blocker, the bypass path is selected so that the overall front-end does not compress. This architecture lets the same hardware serve both small-signal and large-signal conditions in TDD systems.
Typical applications for the MC13851EPR2 include single-band pico-cell and femtocell base-station receivers, 2.4 GHz ISM front-ends for Wi-Fi / Bluetooth / Zigbee radios, LTE band 7/40/41 receive paths, and general-purpose 1-2.5 GHz low-noise gain blocks. It is widely used in NXP's MC13851-1960EVK (1960 MHz) and MC13851-2400EVK (2.4 GHz) evaluation kits for rapid prototyping.
When designing with this part, place the input trace as a 50-ohm controlled-impedance line as short as possible from the antenna filter, and route the DC bias through an RF choke to keep bias noise off the supply rail. Decouple VCC with a 100 nF ceramic capacitor placed within 1-2 mm of the VCC pin to suppress bypass-mode switching transients.
This page synthesises distributor pricing, drop-in LNA alternatives and practical PCB/power-supply design notes that go beyond the manufacturer datasheet, giving RF engineers a faster path to a working front-end.
חלופות תחליף ישיר עבור MC13851EPR2 — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
MC13851EP
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MC13851EPR2G
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MC13851EPR2 דירוגים מרביים ומאפיינים חשמליים
| פונקציה | Low Noise Amplifier (LNA) with integrated bypass switch |
| Frequency Range | 1 GHz to 2.5 GHz |
| Gain | 16.4 dB (typical) |
| מתח אספקה | 2.3 V to 3 V |
| זרם אספקה | 4.8 mA (typical) |
| RF Type | General Purpose / Single-band |
| מארז | 8-MLPD (2x2) with exposed pad (also referenced as 8-WFDFN EP / 8-UDFN EP) |
| Input / Output Match | On-chip, 50 ohm nominal |
| Bypass Switch | Integrated (selectable for high-linearity mode) |
| Bias Circuitry | On-chip (no external bias reference required) |
| סוג הרכבה | Surface Mount |
| סטטוס RoHS | Compliant (per distributor listings) |
| Packaging | Tape & Reel (EPR2 suffix) |
תצורת פינים של MC13851EPR2
| פין 1 | GND — RF/DC ground (also exposed pad) |
| פין 2 | RF_IN — RF input, 50 ohm matched on-chip |
| פין 3 | GND — RF/DC ground |
| פין 4 | BYPASS — Bypass-mode logic control input |
| פין 5 | VCC — Supply voltage (2.3 V to 3 V) |
| פין 6 | GND — RF/DC ground |
| פין 7 | RF_OUT — RF output, 50 ohm matched on-chip |
| פין 8 | GND — RF/DC ground; EP also ground |
יישומים טיפוסיים
MC13851EPR2 מתאים עבור 6 יישוםs: 2.4 GHz ISM / Wi-Fi Receiver Front-End, Single-Band Pico-Cell / Femtocell Receiver, LTE Band 7 / 40 / 41 Receive Path, Bluetooth / Zigbee LNA Stage, Cable & Satellite IF Gain Block, General-Purpose RF Test & Measurement Front-End.
2.4 GHz ISM / Wi-Fi Receiver Front-End
The MC13851EPR2 is a natural fit for the 2.4 GHz ISM receive chain because its 1GHz to 2.5GHz bandwidth covers the entire 2.4-2.5 GHz Wi-Fi/Bluetooth/Zigbee band with 16.4 dB typical gain. Placed between the antenna filter and the down-converting mixer (or ADC in an SDR implementation), the part's on-chip 50-ohm matching eliminates the LC network, while the integrated bypass switch raises IIP3 when a strong neighbouring 2.4 GHz interferer appears. The 4.8 mA supply current keeps power budget modest - the EVK reference design (MC13851-2400EVK) demonstrates a complete 2.4 GHz LNA footprint usable in production.
מומלץ
Single-Band Pico-Cell / Femtocell Receiver
Femtocell and pico-cell base stations need a low-cost, compact LNA in the 1.9-2.1 GHz band, and the MC13851EPR2 covers this range with the required 16.4 dB gain and 4.8 mA bias current. The integrated bypass switch improves resilience to in-band blockers in dense urban deployments, which is critical because femtocells are often co-located with macro cells. The 8-MLPD (2x2 mm) footprint allows several front-end channels to be placed within a small radio module without thermal or PCB-routing congestion.
מומלץ
LTE Band 7 / 40 / 41 Receive Path
LTE bands 7 (2.5-2.69 GHz), 40 (2.3-2.4 GHz) and 41 (2.5-2.69 GHz, TDD) fall partly within or adjacent to the MC13851EPR2's 1-2.5 GHz range, making the part usable as the first gain stage in single-band TDD-LTE receivers. The 16.4 dB gain lifts noise-riding signals above the ADC noise floor, while the bypass mode lets the receiver handle the strong out-of-band LTE signals and adjacent band-7 TD-LTE blockers. A typical implementation chains the MC13851EPR2 to a SAW filter and then to an integrated transceiver such as the NXP/Freescale predecessor devices.
מומלץ
Bluetooth / Zigbee LNA Stage
Bluetooth (2.4-2.4835 GHz) and Zigbee (2.4-2.4835 GHz) low-power radios often need a discrete LNA to extend range in industrial or smart-home installations, and the MC13851EPR2 is a drop-in solution in this band. The 16.4 dB gain and integrated bias mean that only the IC, an input match trace, and a 100 nF decoupling capacitor are required on the RF PCB footprint. The single 3 V supply is convenient for battery-backed systems using Li-ion or USB-bus-derived rails.
מומלץ
Cable & Satellite IF Gain Block
Although not a true CATV amplifier, the MC13851EPR2's broadband 1-2.5 GHz range and 16.4 dB usable gain also let it be repurposed as a low-cost gain block in 1-2 GHz cable-TV upstream and intermediate-frequency stages. The on-chip 50-ohm match supports cascaded stages without inter-stage matching networks, and the 4.8 mA bias is small enough to allow several cascaded blocks within a head-end module. Designers should evaluate linearity (IIP3) and P1dB against the specific cable upstream plan before deployment.
מומלץ
General-Purpose RF Test & Measurement Front-End
Bench RF test equipment and developer-grade SDR front-ends can use the MC13851EPR2 as a generic 1-2.5 GHz low-noise gain block. The 8-MLPD package is breadboard-friendly with exposed paddle for grounding, and the integrated bypass switch lets a developer toggle gain mode electronically. The part's documented electrical performance and 50-ohm match simplify characterisation against known noise-figure sources during product bring-up.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור MC13851EPR2 — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | MC13851EP | MC13851EPR2G |
|---|---|---|---|
| Package | 8-MLPD (2x2) with EP | 8-MLPD (2x2) with EP - same | 8-MLPD (2x2) with EP - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Frequency Range | 1 GHz to 2.5 GHz | 1 GHz to 2.5 GHz - same | 1 GHz to 2.5 GHz - same |
| Gain | 16.4 dB typical | 16.4 dB typical - same | 16.4 dB typical - same |
| Supply Voltage | 2.3 V to 3 V | 2.3 V to 3 V - same | 2.3 V to 3 V - same |
| Supply Current | 4.8 mA typical | 4.8 mA typical - same | 4.8 mA typical - same |
| Bypass Switch | Integrated | Integrated - same | Integrated - same |
| Packaging | Tape & Reel (EPR2) | Tube / Tray (EP) | Tape & Reel, green/RoHS (EPR2G) |
מבדילים עיקריים
- Compact 8-MLPD (2x2 mm) package with exposed thermal pad (לעומתMC13821 (8-pin larger package))
- Integrated bypass switch for blocker handling (לעומתDiscreet LNA with external attenuator bypass)
- Single 3 V supply, on-chip bias (לעומתCompetitor LNAs requiring external bias reference and 5 V rail)
הערות תכנון
Keep the RF input trace as a 50-ohm controlled-impedance line as short as possible from the antenna/SAW filter output. Place the 100 nF VCC decoupling capacitor within 1-2 mm of pin 5 and route VCC through an RF choke (typically 100 nH to 220 nH) so that supply noise does not couple into the RF path. The exposed paddle must be soldered to a contiguous ground pour with multiple ground vias placed on a 0.5 mm pitch around the EP perimeter to keep the RF return path low-impedance at 2.4 GHz.
Use a low-noise LDO (LDO noise floor below a few uVrms) to feed the MC13851EPR2 supply rail. Although the part's on-chip bias is stable, RF LNA supply-noise rejection at 1-2.5 GHz is limited and a noisy 3 V rail will modulate the LNA's gain and noise figure. A ferrite bead in series with the supply trace further improves isolation from shared digital rails on the same PCB.
Avoid placing the bypass-switch control line (BYPASS, pin 4) on a trace that passes near the RF output - the switching edge can couple into the 2.4 GHz output. Tie BYPASS to GND for permanent LNA-mode operation; drive it through a 10 kohm resistor for digital control. Do not exceed the absolute maximum supply voltage of 3.6 V or the device may be permanently damaged - a TVS diode on VCC is recommended for portable hot-plug scenarios.
The 8-MLPD (2x2 mm) package with exposed pad has a low junction-to-ambient thermal resistance (theta_JA typically ~50 C/W on a 1 oz 4-layer PCB with EP soldered). At 4.8 mA from a 3 V supply the dissipation is about 14 mW, which is well within the package's thermal envelope - no heatsinking is required even at +85 C ambient. Pay attention to PCB copper area over the EP during thermal design verification, especially for enclosed housings with limited airflow.
מידע על תאימות
RoHS compliance per DigiKey product listing. No AEC-Q100 qualification is offered for this consumer-grade RF LNA. Manufacturer has not published halogen-free status; treat as unknown until confirmed on lot-specific certificate of compliance.
