Infineon Technologies BFP640E6327

Overview

BFP640E6327 from Infineon Technologies is an NPN silicon germanium RF transistor optimized for low-noise, high-gain amplification in wireless front-ends. It delivers 0.65 dB noise figure at 1.8 GHz and 24 dB maximum stable gain at the same frequency, with 70 GHz f_T, gold metallization, and AEC-Q101 qualification - deployed in CDMA and WLAN receiver LNA stages.

For engineers reviewing the BFP640E6327 datasheet, BFP640E6327 pinout, BFP640E6327 application, or BFP640E6327 equivalent, key selection criteria include noise figure vs. frequency, Z_Sopt impedance mapping, S-parameter stability (k > 1), thermal resistance (R_thJS ≤ 300 K/W), and RoHS-compliant SOT343 packaging for high-reliability RF designs.

Technical Context

This SiGe NPN transistor uses a Gummel-Poon SPICE model with verified f_T ≥ 40 GHz (IC = 30 mA, V_CE = 3 V) and exhibits broadband noise performance: F = 0.65 dB @ 1.8 GHz and F = 1.2 dB @ 6 GHz under matched Z_Sopt conditions. Its C_cb = 0.09–0.2 pF and C_eb = 0.5 pF support stable 50 Ω matching up to 6 GHz.

The device operates with V_CEO = 4 V, I_C = 50 mA max, and P_tot = 200 mW at T_S ≤ 90 °C. Package parasitics (e.g., L_BC = 120 pH, C_CEO = 131.2 fF) are characterized and validated to 6 GHz, enabling accurate EM-aware circuit simulation.

Key Specifications

Pinout & Package

Supplied in RoHS-compliant SOT343 (SC-82AB) package with gold-metallized leads for high reliability and wire-bond compatibility. Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector, Pin 4 = Emitter (dual-emitter configuration).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RF transistor applications.

Compared with BFP640H6327, the E6327 variant offers identical RF performance with smaller reel logistics; versus NE85633, it delivers superior noise figure below 6 GHz but requires tighter bias control due to lower V_CEO.

Availability

BFP640E6327 is available at Aetrix Electronics and suitable for CDMA receiver design, WLAN front-end development, and automotive GNSS LNA modules requiring stable component supply across multi-year production cycles.

Supply support for BFP640E6327 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, and high-frequency RF components with global manufacturing and quality certification.

The BFP640 belongs to Infineon's SiGe RF transistor product line, engineered specifically for ultra-low-noise, high-linearity amplification in sub-6 GHz wireless infrastructure and mobile terminal applications.

FAQ

What is the recommended DC bias condition for minimum noise figure?

For minimum noise figure at 1.8 GHz, operate at I_C = 5 mA and V_CE = 3 V with source impedance matched to Z_Sopt ≈ 50 + j15 Ω. This condition is validated per Infineon's Application Note AN341 and yields F = 0.65 dB. Higher collector currents increase gain but degrade noise figure above 10 mA.

Can BFP640E6327 be used in 5G sub-6 GHz bands?

Yes - its 1.2 dB noise figure at 6 GHz and verified S-parameters up to 6 GHz make it suitable for n77/n78/n79 5G FR1 bands. However, for 3.5 GHz operation, Z_Sopt shifts to ~42 − j8 Ω, requiring re-optimization of the input matching network per the provided impedance plots.

Is thermal derating required above 90 °C board temperature?

Yes - total power dissipation must be linearly derated above T_S = 90 °C per the curve in datasheet Figure 5: P_tot = 200 mW × (1 − (T_S − 90)/30). At T_S = 105 °C, maximum allowable dissipation drops to 100 mW to maintain T_j ≤ 150 °C.

Does the dual-emitter configuration require external connection?

No - Pins 2 and 4 are internally isolated emitters. For standard use, both are connected to AC ground. Differential or push-pull configurations require external biasing of Pin 4 independent of Pin 2, as detailed in Infineon's BFP640 Application Circuit AN339.