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

Diodes Incorporated ZM33164N8TA

Name: ZM33164N8TA
Brand: Diodes Incorporated
SKU: ZM33164N8TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZM33164N8TA

Manufacturer:: Diodes Incorporated

Category:: Supervisors

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: ZM33164N8TA.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ZM33164N8TA from Zetex Semiconductors (now Diodes Incorporated) is a three-terminal under-voltage monitor IC for microprocessor power-on reset and brown-out detection in 5V systems. It features a fixed 4.3V threshold, 60mV hysteresis, open-collector output sinking ≥10mA, and guaranteed operation from 1V to 10V supply. Used in embedded controllers where reliable reset assertion during power ramp-up or sag is critical.

For engineers reviewing the ZM33164N8TA datasheet, ZM33164N8TA pinout, ZM33164N8TA application, or ZM33164N8TA equivalent, key selection factors include its precise 4.3V trip point, built-in hysteresis, low quiescent current (175–260µA), TO92/SO8/SOT223 package options, and compatibility with standard 5V logic reset inputs.

Technical Context

The ZM33164N8TA integrates a precision bandgap voltage reference and a comparator with internal hysteresis to eliminate oscillation near the threshold. Its open-collector output requires only one external pull-up resistor to interface with TTL/CMOS reset inputs.

Operation begins at V_CC ≥ 1V; below 4.15V (min), output is actively pulled low; above 4.45V (max), output floats high. Propagation delay is 2.0µs typical under defined load and temperature conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Threshold Voltage (rising)	4.15–4.45V - defines exact 5V system reset release point
Hysteresis	60mV - prevents chatter during slow or noisy supply transitions
Output Sink Current	10–50mA - drives standard reset inputs without buffer stage
Quiescent Current	175–260µA at 5V - enables low-power battery-backed monitoring
Supply Range	1.0–10V - supports wide input margin including partial power-up states
Propagation Delay	2.0µs typical - ensures fast response to brown-out events
Operating Temp	−40°C to +85°C - qualified for industrial and automotive environments

Pinout & Package

Package: SO8 (suffix N8), leaded plastic small-outline package with standard 1.27mm pitch; thermal pad on underside not electrically connected.

Pin/Terminal	Circuit Role	Design Meaning
1 (V_IN)	Supply Input	Monitored voltage rail; device operates from 1V–10V here
2 (GND)	Ground Reference	Analog and digital ground return for reference and comparator
3 (OUT)	Open-Collector Output	Sinks current when V_IN < threshold; requires external pull-up
4–8	No Connect / Thermal Pad	Pins 4–7 are NC; Pin 8 is exposed thermal pad (not bonded)

Key Features

Feature	Design Value
Fixed 4.3V Threshold	Optimized for clean release of 5V µP reset lines without external resistive divider
Internal Hysteresis	60mV prevents false resets during marginal or noisy supply recovery
Open-Collector Output	Direct interface to diverse logic families (TTL, CMOS, microcontroller reset pins)
Clamp Diode Integration	Allows safe discharge of external RC delay capacitor without external diode
1V Start-Up Capability	Asserts reset from earliest power ramp phase, enabling robust POR sequencing

Applications

Microprocessor Power-On Reset

Battery-Powered Instrumentation

Use Scenario: System powers up from cold start; supply ramps from 0V to 5V.

IC Role / Device Role / Timing Role: Under-voltage monitor asserting active-low reset until stable 5V is reached and maintained.

Use Value: Guarantees CPU remains held in reset until V_CC exceeds 4.3V and hysteresis window clears, preventing illegal instruction execution.

Use Scenario: Portable multimeter operating from two AA cells (2.0–3.2V nominal).

IC Role / Device Role / Timing Role: Monitors declining battery voltage and triggers controlled shutdown before data corruption.

Use Value: Uses 1V minimum operating voltage to detect early depletion; hysteresis avoids repeated wake/sleep cycling near cutoff.

Automotive Body Control Module

Industrial PLC I/O Card

Use Scenario: Vehicle battery dips during cranking (down to ~6V), then recovers.

IC Role / Device Role / Timing Role: Brown-out detector maintaining reset during transient sags below 4.3V.

Use Value: Prevents spurious MCU reboots during engine start; 85°C rating supports under-hood placement.

Use Scenario: Factory-floor controller subjected to line surges and EMI-induced supply noise.

IC Role / Device Role / Timing Role: Supervisory circuit rejecting short-duration dips via hysteresis and propagation delay filtering.

Use Value: 2.0µs delay and 60mV hysteresis jointly suppress false resets from switching noise on 5V bus.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX809SEUR+T	4.63V threshold, 140mV hysteresis, 1.2µs delay, SOT23-3	Higher trip point suits 5V systems with tighter tolerance; smaller footprint	Prefer when higher reset threshold or space-constrained PCB layout is required
TPS3808G12DBVR	Adjustable threshold (via resistor divider), 2.9µs delay, enable pin, SOT23-6	Supports custom trip points and sequenced power monitoring across multiple rails	Choose when design requires programmability or multi-rail supervision

Compared with MAX809SEUR+T and TPS3808G12DBVR, the ZM33164N8TA offers fixed 4.3V accuracy ideal for legacy 5V µP reset, lower quiescent current than MAX809, and simpler 3-pin interface versus TPS3808's 6-pin configurability-making it optimal for cost-sensitive, high-volume industrial reset applications.

Availability

ZM33164N8TA is available at Aetrix Electronics and suitable for microprocessor reset, battery-powered instrumentation, and automotive body control modules requiring stable component supply over extended production lifecycles.

Supply support for ZM33164N8TA 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, acquired by Diodes Incorporated in 2008, specialized in high-performance analog and power management ICs for industrial and automotive markets.

The ZM33164 belongs to Zetex's supervisor IC product line, designed specifically for robust, low-cost power-on and brown-out reset generation in 5V microprocessor systems with minimal external components.

FAQ

What is the function of the clamp diode inside the ZM33164N8TA?

The integrated clamp diode connects between the V_IN pin and GND, allowing safe discharge of an external RC timing capacitor used for reset delay extension. This eliminates the need for an external diode in time-delayed reset circuits, reducing component count and board area while ensuring predictable discharge behavior across temperature.

Can the ZM33164N8TA be used with a 3.3V microprocessor system?

No-the ZM33164N8TA has a fixed 4.3V threshold optimized for 5V logic. Using it with a 3.3V system would cause continuous reset assertion since V_CC never reaches the trip point. For 3.3V systems, a dedicated 3.08V or 3.0V supervisor such as the MCP100-302DI/TO is required.

How does the hysteresis improve system reliability?

The 60mV hysteresis creates separate rising (4.33V typ) and falling (4.27V typ) thresholds, preventing output oscillation when supply voltage lingers near the trip point due to noise or slow regulation. This eliminates multiple reset pulses during marginal power conditions, ensuring deterministic single-event reset assertion and release.

Is the SO8 package thermally enhanced compared to TO92?

Yes-the SO8 package (ZM33164N8TA) has a rated power dissipation of 780mW, identical to TO92, but achieves better thermal coupling to PCB copper. Its exposed thermal pad (Pin 8) allows soldering to internal ground planes, improving long-term reliability in sustained 10V/10mA sink conditions versus through-hole TO92's limited heatsinking.

ZM33164N8TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

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:: 8-SO

ZM33164N8TA FAQ

1.How can I place an order for ZM33164N8TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZM33164N8TA 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 ZM33164N8TA reliable?

The price and inventory of ZM33164N8TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZM33164N8TA is usually 5 days.

3.What payment methods are accepted for ZM33164N8TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZM33164N8TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZM33164N8TA?

ZM33164N8TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZM33164N8TA 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 ZM33164N8TA?

For technical support, including ZM33164N8TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZM33164N8TA requirements.

6.How does Aetrix verify that ZM33164N8TA is sourced from the original manufacturer or authorized distributors?

All ZM33164N8TA 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 ZM33164N8TA meets industry standards.

7.What is the process for return or replacement of ZM33164N8TA?

All ZM33164N8TA units undergo pre-shipment inspection (PSI). If there is an issue with ZM33164N8TA, 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 ZM33164N8TA part is unused and in its original packaging.

Return procedure for ZM33164N8TA:

1.Submit a request within 90 days.

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

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