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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Diodes Incorporated ZM33164GTA

Name: ZM33164GTA
Brand: Diodes Incorporated
SKU: ZM33164GTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZM33164GTA

Manufacturer:: Diodes Incorporated

Category:: Supervisors

Package:: TO-261-4, TO-261AA

Datasheet:: ZM33164GTA.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT223

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ZM33164GTA from Zetex Semiconductors is a three-terminal under-voltage monitor IC for microprocessor power-on reset and brownout detection in 5 V systems, featuring a fixed 4.3 V threshold, 60 mV hysteresis, open-collector output capable of sinking ≥10 mA, and guaranteed operation from 1.0 V to 10 V supply.

For engineers reviewing the ZM33164GTA datasheet, ZM33164GTA pinout, ZM33164GTA application, or ZM33164GTA equivalent, key selection criteria include threshold accuracy (±150 mV), hysteresis stability over temperature, sink current capability at low Vcc, and compatibility with TO92/SOT223 PCB layouts for legacy and space-constrained designs.

Technical Context

The ZM33164GTA integrates a precision bandgap voltage reference and comparator with built-in hysteresis to eliminate oscillation during supply ramp-up/down transitions. Its output remains low below 4.15 V (VIL) and transitions high only above 4.45 V (VIH), ensuring clean reset assertion without chatter.

Operation is fully functional from 1.0 V input, enabling reliable power-on reset generation even during weak battery start-up. The internal clamp diode allows direct connection to external delay capacitors for adjustable reset timeout, eliminating need for discrete discharge components.

Key Specifications

Parameter	Value and Actual Design Meaning
Threshold Voltage (VIH)	4.15–4.45 V - defines minimum supply level required to release reset in rising-Vcc condition
Hysteresis (VH)	20–60 mV - prevents repeated toggling near threshold during slow or noisy supply transitions
Output Sink Current	10–50 mA - supports direct drive of TTL/CMOS inputs or reset lines without buffer stage
Quiescent Current	175–260 µA at 5 V - enables use in battery-powered systems with multi-year standby life
Supply Range	1.0–10 V - accommodates wide-input DC-DC outputs and degraded battery rails down to 1 V
Propagation Delay	2.0 µs - ensures sub-microsecond response to supply dips, critical for fast microcontroller recovery
Clamp Diode VF	0.6–1.5 V at 10 mA - provides controlled discharge path for external RC timing capacitor

Pinout & Package

The ZM33164GTA is supplied in SOT223 package (suffix G), with Pin 1 = V_IN, Pin 2 = GND, Pin 3 = OUTPUT, Pin 4 = NC (floating or tied to Pin 2 per datasheet).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (V_IN)	Supply Input	Monitored voltage rail; device asserts reset when this falls below 4.3 V
Pin 2 (GND)	Ground Reference	Return path for internal reference and output stage; must be low-impedance
Pin 3 (OUTPUT)	Open-Collector Output	Sinks current to pull reset line low; requires external pull-up resistor
Pin 4 (NC)	No Connect	Internally unconnected; may be left floating or bonded to Pin 2 for thermal/mechanical stability

Key Features

Feature	Design Value
Fixed 4.3 V Threshold	Optimized for 5 V logic families; eliminates need for external resistor divider calibration
60 mV Hysteresis	Guarantees monotonic reset release and prevents false releases during marginal supply conditions
1 V Minimum Operating Voltage	Enables full reset functionality during ultra-low-power wake-up sequences and battery depletion scenarios
Integrated Clamp Diode	Removes requirement for external Schottky diode in RC-delayed reset circuits, reducing BOM count
TO92 & SOT223 Options	Supports both through-hole prototyping and high-density surface-mount production without redesign

Applications

Microprocessor Power-On Reset

Battery-Powered Instrumentation

Use Scenario: System initialization after cold power-up or deep sleep wake-up in embedded controllers.

IC Role / Device Role / Timing Role: Generates a clean, glitch-free active-low reset pulse until V_CC stabilizes above 4.3 V.

Use Value: Prevents CPU lockup or corrupted register states by enforcing minimum valid supply before instruction fetch begins.

Use Scenario: Long-life portable test equipment operating from single-cell Li-ion or alkaline batteries.

IC Role / Device Role / Timing Role: Monitors decaying battery voltage and triggers graceful shutdown before brownout-induced data loss.

Use Value: 175 µA quiescent current extends usable battery life; 1 V operation detects end-of-discharge earlier than comparator-based alternatives.

Automotive Body Control Module

Industrial Computer Peripheral

Use Scenario: Reset supervision in 12 V automotive subsystems using 5 V LDO-regulated logic rails.

IC Role / Device Role / Timing Role: Detects transient load-dump-induced dips on 5 V rail and reasserts reset to recover MCU state.

Use Value: 60 mV hysteresis rejects noise from alternator ripple; -40°C to +85°C rating meets AEC-Q100 ambient requirements.

Use Scenario: Reliable reset conditioning for USB-to-serial bridge ICs and FPGA configuration circuits.

IC Role / Device Role / Timing Role: Provides deterministic reset timing independent of host controller's internal POR circuitry.

Use Value: 2.0 µs propagation delay ensures synchronous release across multi-chip peripherals; SOT223 footprint fits tight board spacing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar under-voltage monitor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX809TRD2	4.63 V threshold, 150 mV hysteresis, 20 µA I_Q, SOT23-3	Higher threshold unsuitable for 5 V ±5% rails; lower I_Q benefits ultra-low-power apps	Select when tighter threshold tolerance (±1.5%) and smaller footprint outweigh 4.3 V match
TLV803EB29DBZR	2.93 V threshold, 100 mV hysteresis, 0.5 µA I_Q, SOT23-3	Designed for 3.3 V systems; incompatible with 5 V reset timing without level-shifting	Choose only for 3.3 V domains requiring nanowatt standby; not drop-in for ZM33164GTA

Compared with MAX809TRD2 and TLV803EB29DBZR, the ZM33164GTA uniquely balances 4.3 V threshold accuracy, robust 10 mA sink drive, and 1 V operational floor-making it optimal for legacy 5 V microprocessor reset where timing margin and drive strength are prioritized over ultra-low I_Q.

Availability

ZM33164GTA is available at Aetrix Electronics and suitable for microprocessor systems, battery-powered instrumentation, and automotive body control modules requiring stable component supply with long-term industrial availability.

Supply support for ZM33164GTA 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

Zetex Semiconductors plc was a UK-based analog and power semiconductor manufacturer, acquired by Diodes Incorporated in 2008; its legacy voltage supervisor portfolio remains widely deployed in industrial and automotive designs.

The ZM33164 series belongs to Zetex's precision voltage monitoring product line, engineered specifically for deterministic power-on and brownout reset generation in 5 V microprocessor systems with minimal external components.

FAQ

What is the minimum supply voltage required for ZM33164GTA to assert a valid reset?

The ZM33164GTA asserts reset (output low) whenever V_IN falls below 4.15 V (VIL min). It remains functional and holds output low down to 1.0 V input, enabling reset assertion even during severe brownout or battery depletion-no minimum operating voltage threshold limits reset validity.

Can ZM33164GTA drive a standard CMOS reset input directly?

Yes. With its 10 mA sink capability and 0.46 V saturation voltage at 8 mA, the ZM33164GTA can directly drive typical CMOS reset inputs (e.g., ARM, PIC, AVR) when paired with a 10 kΩ pull-up to 5 V, delivering >4.5 V high-state margin and <0.5 V low-state guarantee across temperature.

How is reset timeout adjusted using the internal clamp diode?

The internal clamp diode connects between OUTPUT and GND. When an RC network is added (R from OUTPUT to V_CC, C from OUTPUT to GND), the diode discharges C rapidly upon reset release, setting precise timeout via T_DY = R × C × ln(1/(1 − V_TH/V_IN)), eliminating external discharge components.

Is ZM33164GTA pin-compatible with ZM33164C (TO92 version)?

Yes-both share identical pinout: Pin 1 = V_IN, Pin 2 = GND, Pin 3 = OUTPUT. The SOT223 (GTA) and TO92 (C) variants differ only in package and thermal performance (2 W vs. 780 mW), allowing direct PCB footprint substitution where layout permits.

ZM33164GTA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-261-4, TO-261AA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 4.3V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: 2µs Typical Propagation Delay

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223-3

ZM33164GTA FAQ

1.How can I place an order for ZM33164GTA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZM33164GTA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ZM33164GTA reliable?

The price and inventory of ZM33164GTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZM33164GTA is usually 5 days.

3.What payment methods are accepted for ZM33164GTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZM33164GTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZM33164GTA?

ZM33164GTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZM33164GTA order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ZM33164GTA?

For technical support, including ZM33164GTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZM33164GTA requirements.

6.How does Aetrix verify that ZM33164GTA is sourced from the original manufacturer or authorized distributors?

All ZM33164GTA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ZM33164GTA meets industry standards.

7.What is the process for return or replacement of ZM33164GTA?

All ZM33164GTA units undergo pre-shipment inspection (PSI). If there is an issue with ZM33164GTA, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ZM33164GTA part is unused and in its original packaging.

Return procedure for ZM33164GTA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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