Diodes Incorporated AZ574ZTR-E1

Overview

AZ574ZTR-E1 from BCD Semiconductor Manufacturing Limited is a monolithic 33 V precision voltage reference IC designed for cathode-anode operation in TV tuner AGC and band-switching circuits. It delivers 33 V nominal cathode voltage (±2 V), 0.6 mV/°C temperature drift, <12 Ω dynamic impedance at 1 kHz, and supports up to 30 mA operating cathode current - enabling stable tuning voltage generation in analog broadcast tuners.

For engineers reviewing the AZ574ZTR-E1 datasheet, AZ574ZTR-E1 pinout, AZ574ZTR-E1 application, or AZ574ZTR-E1 equivalent, key selection criteria include cathode voltage stability over -20°C to +75°C ambient, low dynamic impedance under 5–30 mA load, TO-92-2 mechanical compatibility, and RoHS-compliant lead-free packaging (E1 suffix).

Technical Context

The AZ574ZTR-E1 operates as a two-terminal shunt voltage reference with anode and cathode terminals only - no control or sense pins. Its internal structure provides fixed 33 V regulation via bandgap-derived Zener-like stabilization, optimized for constant-current biasing in tuner front-end voltage-controlled oscillators and band-selection switches.

It functions within a narrow ambient range (-20°C to +75°C), requires external series resistance for current limiting, and exhibits worst-case cathode voltage drift of 0.6 mV/°C across that full range - verified at I_KA = 5 mA. Dynamic impedance remains ≤12 Ω at 1 kHz with 0.5 mA AC superimposed on 5 mA DC cathode current.

Key Specifications

Pinout & Package

Package: TO-92-2 - 3-lead plastic package with leads spaced 0.1" (2.54 mm) apart, body height ≤4.7 mm, lead diameter 0.38–0.55 mm, and standard orientation per Figure 2 (top view).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt voltage reference applications.

Compared with TL431ACLP and LM4040C33IDBZR, the AZ574ZTR-E1 offers native 33 V fixed output, higher cathode current (30 mA), TO-92-2 through-hole fit, and proven thermal stability in tuner environments - making it uniquely suited for legacy analog TV tuner replacement without circuit modification.

Availability

AZ574ZTR-E1 is available at Aetrix Electronics and suitable for analog TV tuner repair, broadcast equipment maintenance, and legacy consumer electronics refurbishment requiring stable component supply and long-lifecycle support.

Supply support for AZ574ZTR-E1 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

BCD Semiconductor Manufacturing Limited is a Shanghai-based analog IC foundry and fabless designer specializing in high-reliability power management and precision analog components for consumer and industrial markets.

The AZ574 belongs to BCD's legacy voltage reference product line, engineered specifically for analog TV tuner applications where fixed 33 V cathode bias, low temperature drift, and TO-92-2 mechanical compatibility were critical design requirements.

FAQ

What is the maximum allowable cathode current for continuous operation?

The AZ574ZTR-E1 supports up to 30 mA cathode current under recommended operating conditions (TA = –20°C to +75°C). At 75°C ambient, power dissipation must not exceed 700 mW - limiting practical current to ~21 mA when VKA = 33 V. Exceeding 30 mA risks permanent damage per absolute maximum ratings.

Can AZ574ZTR-E1 replace a generic 33 V Zener diode in tuner circuits?

Yes - the AZ574ZTR-E1 is a direct functional upgrade over discrete 33 V Zeners, offering lower dynamic impedance (5–12 Ω vs. >50 Ω), tighter voltage tolerance (±2 V vs. ±5%), and superior temperature stability (0.6 mV/°C vs. 2–5 mV/°C). No circuit changes are needed beyond verifying series resistor value.

Is the TO-92-2 package compatible with standard through-hole assembly equipment?

Yes - the TO-92-2 package uses standard 0.1" (2.54 mm) lead spacing, 4.4–4.7 mm body height, and 0.38–0.55 mm lead diameter, matching IPC-7351B TO-92-2 land pattern requirements and supporting wave soldering, selective soldering, and manual rework with standard tools.

Does AZ574ZTR-E1 require external capacitors for stability?

No - the AZ574ZTR-E1 is internally compensated and does not require external capacitors for basic shunt operation. However, a 0.1 µF ceramic capacitor placed directly at the cathode-to-anode terminals is recommended to suppress high-frequency noise in tuner RF sections, per typical application guidance in Figure 10.