Diodes Incorporated AZ7042ZTR-E1

Overview

AZ7042ZTR-E1 from BCD Semiconductor Manufacturing Limited is a precision under-voltage detector IC with 4.2 V detection threshold, open-collector output, and -40°C to +85°C operating temperature range. It monitors power supply rails in embedded systems, provides reset signaling during brownout events, and features 50 mV typical hysteresis and 0.8 V minimum operating voltage for reliable low-V_CC operation.

For engineers reviewing the AZ7042ZTR-E1 datasheet, AZ7042ZTR-E1 pinout, AZ7042ZTR-E1 application, or AZ7042ZTR-E1 equivalent, this device serves as a cost-effective, lead-free voltage supervisor for CPU reset generation, battery backup control, and low-battery indication in space-constrained TO-92 ammo-packaged designs.

Technical Context

The AZ7042ZTR-E1 integrates an on-chip precision voltage reference and comparator to compare V_CC against a fixed 4.2 V threshold (±0.15 V over temperature). Its open-collector output requires external pull-up and asserts low when V_CC falls below V_DET− (4.05 V min), releasing high only after V_CC rises above V_DET+ (4.35 V max) due to 50 mV hysteresis.

It operates down to 0.8 V supply (typical), draws just 30 µA at 5.25 V (IC_CH) and 300 µA near detection (IC_CL), and delivers 16 mA sink current across full temperature range - enabling direct LED drive or microcontroller reset assertion without buffering.

Key Specifications

Pinout & Package

AZ7042ZTR-E1 is supplied in TO-92 package with ammo packing (ZTR suffix), featuring 3-pin through-hole configuration and JEDEC-standard mechanical dimensions (12.5 mm length, 4.3 mm diameter).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV7031DBVR and MAX809SEUR+T, AZ7042ZTR-E1 offers higher sink current (16 mA), built-in hysteresis (50 mV), and TO-92 compatibility - making it optimal for cost-sensitive, through-hole designs requiring robust reset signaling without external components.

Availability

AZ7042ZTR-E1 is available at Aetrix Electronics and suitable for low-battery detection, processor reset generation, and power-fail indication requiring stable component supply in industrial, consumer, and medical electronics.

Supply support for AZ7042ZTR-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 and power IC design house specializing in high-reliability, cost-optimized semiconductor solutions for power management and signal conditioning.

The AZ70XX series was developed specifically for accurate, low-power voltage monitoring in resource-constrained embedded systems - emphasizing simplicity, robustness, and compatibility with legacy through-hole assembly processes.

FAQ

What is the exact detect voltage tolerance for AZ7042ZTR-E1 across temperature?

The AZ7042ZTR-E1 has a detect voltage of 4.2 V with ±0.15 V absolute tolerance (4.05 V to 4.35 V) over the full -40°C to +85°C operating range, and a temperature coefficient of ±0.01 %/°C - meaning drift remains within ±3.36 mV over a 30°C change.

Can AZ7042ZTR-E1 drive a standard red LED directly?

Yes - with its 16 mA guaranteed sink current at -40°C to +85°C and 0.4 V max low-level output voltage at 20 mA, AZ7042ZTR-E1 can directly drive a 20 mA red LED using a 220 Ω series resistor from a 5 V rail, as shown in Figure 13 of the datasheet.

Is the TO-92 ammo pack (ZTR) compatible with automated insertion equipment?

Yes - the AZ7042ZTR-E1 uses industry-standard TO-92 ammo packing with defined tape pitch (12.5 mm), carrier width (14.5 mm), and component orientation per JEDEC J-STD-020, enabling compatibility with most axial lead auto-insertion machines used in high-volume manufacturing.

Does AZ7042ZTR-E1 require an external capacitor on the output?

No - the open-collector output does not require an external capacitor. However, a 100 pF load capacitance is specified in timing tests (Figure 12); adding >1 nF may increase propagation delay beyond 15 µs, potentially affecting reset timing margins in high-speed systems.