NXP Semiconductors SA612AN,112

Overview

SA612AN,112 from NXP Semiconductors is a low-power VHF double-balanced mixer with integrated oscillator and voltage regulator, designed for RF signal conversion in communication systems. It delivers 14–17 dB conversion gain at 45 MHz, operates with RF inputs up to 500 MHz and LO frequencies up to 200 MHz, and achieves a typical noise figure of 5.0 dB - making it suitable for cordless telephone and cellular radio front-ends.

For engineers reviewing the SA612AN,112 datasheet, SA612AN,112 pinout, SA612AN,112 application, or SA612AN,112 equivalent, key selection criteria include its Gilbert-cell architecture, internal biasing of RF/LO/mixer ports, SO8 package compatibility, and verified performance in crystal-based 45 MHz IF stages with third-overtone oscillators.

Technical Context

The SA612AN,112 implements a differential Gilbert-cell multiplier core with symmetrical RF inputs (IN_A/IN_B) and balanced mixer outputs (OUT_A/OUT_B), enabling high linearity and rejection of even-order distortion. Its on-chip oscillator supports crystal, tuned-tank, or external LO injection via OSC_B (pin 6), with emitter output (OSC_E, pin 7) usable as a buffered LO source.

Internally biased RF and mixer terminals eliminate external DC blocking requirements, while the 1.5 kΩ || 3 pF input impedance (≤50 MHz) and 1.5 kΩ output termination resistors simplify interface design. The device's temperature-compensated bias network ensures stable operation across −40 °C to +85 °C ambient conditions without external trimming.

Key Specifications

Pinout & Package

SA612AN,112 is housed in an 8-lead SO (SO8, SOT96-1) surface-mount package with 3.9 mm body width and standard pitch - compatible with automated reflow assembly per J-STD-020D lead-free profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar double-balanced mixer and oscillator applications.

Compared with SA612AN,112, SA612AD/01,112 offers identical RF performance in a tape-and-reel format optimized for SMT lines, while NE612N provides functional equivalence only in through-hole implementations - limiting thermal management and layout density in modern VHF systems.

Availability

SA612AN,112 is available at Aetrix Electronics and suitable for cordless telephone receivers, portable VHF transceivers, and RF data link modems requiring stable component supply across extended production lifecycles.

Supply support for SA612AN,112 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and communications markets.

The SA612AN,112 belongs to NXP's legacy RF mixer product line, engineered specifically for cost-sensitive, low-power VHF communication systems - emphasizing integration, low EMI, and compatibility with crystal and ceramic IF filters.

FAQ

What is the maximum RF input frequency supported by the SA612AN,112?

The SA612AN,112 supports RF input frequencies up to 500 MHz, as confirmed in Table 6 of the NXP datasheet (Rev. 3, June 2014). This specification applies across the full operating temperature range (−40 °C to +85 °C) and enables direct VHF reception without additional pre-mixing stages. Performance metrics such as conversion gain and noise figure are characterized at 45 MHz but remain functional within the 500 MHz limit.

Can the SA612AN,112 operate with an external local oscillator signal?

Yes, the SA612AN,112 can accept an external LO signal injected at OSC_B (pin 6) through a DC-blocking capacitor. The datasheet specifies a required input amplitude of 200–300 mV_PP. This mode bypasses the internal oscillator and is used in synthesizer-controlled systems where precise LO frequency agility is needed - for example, in RF data links requiring channel hopping.

What is the typical noise figure of the SA612AN,112 and at what condition is it measured?

The SA612AN,112 has a typical noise figure of 5.0 dB, measured at 45 MHz with VCC = +6 V and Tamb = 25 °C (Table 6, Dynamic Characteristics). This value is critical for receiver sensitivity - enabling detection of −119 dBm signals with 12 dB S/N in cordless telephone applications when paired with appropriate filtering.

Does the SA612AN,112 require external biasing components on its RF input pins?

No, the SA612AN,112 features internally biased RF inputs (IN_A and IN_B). The datasheet explicitly states these pins should not be externally DC-biased. They present an AC impedance of approximately 1.5 kΩ || 3 pF up to 50 MHz and require only AC coupling - simplifying front-end design and reducing component count in compact receivers.

What package type is used for the SA612AN,112 and is it RoHS-compliant?

The SA612AN,112 is supplied in an 8-lead SO (SO8, SOT96-1) plastic small outline package with 3.9 mm body width. Per NXP's product change notifications and compliance documentation, this package variant is RoHS-compliant and qualified for lead-free reflow soldering per J-STD-020D - supporting both SnPb and lead-free assembly processes.