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

Diodes Incorporated ZM331643N8TA

Name: ZM331643N8TA
Brand: Diodes Incorporated
SKU: ZM331643N8TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZM331643N8TA

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: ZM331643N8TA.pdf

Description:: IC SUPPLY VOLT MON 2.68V 8-SOIC

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Product details

Overview

ZM331643N8TA from Zetex Semiconductors is a 3-terminal under-voltage monitor IC for microprocessor power-on reset and brownout detection, featuring a fixed 2.68 V threshold, 60 mV hysteresis, open-collector output capable of sinking ≥10 mA, and guaranteed operation from 1.0 V to 10 V supply. It integrates a precision voltage reference and comparator with internal clamp diode, used in 3 V logic systems requiring reliable reset assertion during power ramp-up or sag.

For engineers reviewing the ZM331643N8TA datasheet, ZM331643N8TA pinout, ZM331643N8TA application, or ZM331643N8TA equivalent, key selection criteria include threshold accuracy over temperature (±0.06 V), sink current capability at low V_CC, hysteresis stability, and compatibility with TO92/SOT223 board layouts for through-hole or surface-mount deployment.

Technical Context

The ZM331643N8TA implements a bandgap-referenced comparator with built-in hysteresis to eliminate oscillation near threshold crossing. Its output remains low when V_CC < 2.68 V (rising) or drops below 2.62 V (falling), ensuring clean reset assertion without chatter.

It supports time-delayed reset via external RC network connected to the internal clamp diode, enabling programmable delay up to milliseconds. The device operates down to 1.0 V input, maintaining defined output state across –40°C to +85°C, with quiescent current ≤190 µA at 3 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Threshold Voltage (rising)	2.55–2.71 V - defines minimum V_CC required to release reset in 3 V systems
Hysteresis	0.03–0.15 V - prevents false triggering during slow or noisy supply transitions
Output Sink Current	10–60 mA - drives standard TTL/CMOS inputs directly with single pull-up resistor
Quiescent Current	125–190 µA at 3 V - enables low-power battery operation without compromising reset reliability
Supply Range	1.0–10 V - supports wide-input applications including Li-ion, NiMH, and regulated 3.3/5 V rails
Clamp Diode V_F	0.6–1.5 V @ 10 mA - allows precise RC-based reset timing by discharging external capacitor
Propagation Delay	2.5 µs - ensures fast response to supply collapse, critical for real-time system recovery

Pinout & Package

Available in TO92 (suffix C) and SOT223 (suffix G) packages. ZM331643N8TA corresponds to SOT223 package with Pin 4 internally floating or tied to Pin 2 (V_OUT).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (SOT223)	V_CC	Positive supply input; device draws current here and asserts reset when below threshold
Pin 2 (SOT223)	V_OUT	Open-collector output; sinks current when reset active; requires external pull-up
Pin 3 (SOT223)	GND	Ground reference for comparator and internal reference; must be low-impedance
Pin 4 (SOT223)	NC / V_OUT	No internal connection or bonded to Pin 2; may be left unconnected or used as thermal pad

Key Features

Feature	Design Value
Fixed 2.68 V threshold	Optimized for 3 V microprocessor reset; eliminates need for external resistor divider calibration
60 mV typical hysteresis	Ensures monotonic output transition across temperature and noise, avoiding metastability
Internal clamp diode	Enables accurate RC reset delay generation without discrete diode or timing IC
1.0 V minimum operating voltage	Asserts valid reset signal even during deep brownout or battery depletion scenarios
TO92 and SOT223 options	Supports legacy through-hole assembly and modern high-density SMT production

Applications

Microprocessor Power-On Reset

Battery-Powered Instrumentation

Use Scenario: Power sequencing in embedded controllers where stable V_CC must exceed 2.68 V before firmware execution begins.

IC Role / Device Role / Timing Role: Under-voltage monitor providing active-low reset signal synchronized to supply ramp.

Use Value: Prevents CPU lockup or corrupted memory writes during incomplete power-up by holding reset until V_CC ≥ 2.71 V.

Use Scenario: Portable multimeter with alkaline battery pack experiencing gradual voltage decay.

IC Role / Device Role / Timing Role: Brownout detector triggering controlled shutdown before ADC reference drift compromises measurement accuracy.

Use Value: Maintains data integrity by asserting reset at 2.62 V (falling), allowing safe EEPROM save before power loss.

Automotive Body Control Module

Industrial PLC I/O Card

Use Scenario: 12 V automotive system with local 3.3 V LDO supplying MCU; load dump or cold-crank events cause transient dips.

IC Role / Device Role / Timing Role: Supply monitor detecting sub-threshold dips on 3.3 V rail to initiate watchdog reset.

Use Value: Ensures deterministic recovery after voltage sags >20 ms, meeting ISO 16750-2 pulse 4 immunity requirements.

Use Scenario: DIN-rail mounted PLC with isolated 3 V logic domain powering field I/O drivers.

IC Role / Device Role / Timing Role: Supervisory circuit validating auxiliary 3 V supply before enabling digital isolators and gate drivers.

Use Value: Avoids spurious I/O toggling by enforcing 2.55 V minimum before releasing enable signals to output stages.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX809TRD2T	2.93 V threshold; 140 µA quiescent current; no internal clamp diode	Requires external RC network for delay; less suitable for precise timing-critical reset	Preferred where higher threshold aligns with 3.3 V logic; avoid if RC delay is mandatory
TLV803DBZT	2.63 V threshold; 0.5 µA quiescent current; push-pull output	No open-collector flexibility; lower drive strength (4 mA sink); no clamp diode	Best for ultra-low-power applications where reset polarity and timing simplicity outweigh drive needs

Compared with MAX809TRD2T and TLV803DBZT, the ZM331643N8TA uniquely combines 2.68 V threshold matching 3 V systems, integrated clamp diode for accurate RC delay, and 10 mA+ sink capability-making it optimal for cost-sensitive, timing-aware reset circuits where external component count must be minimized.

Availability

ZM331643N8TA is available at Aetrix Electronics and suitable for microprocessor reset, battery-powered instrumentation, automotive body control modules, and industrial PLC I/O cards requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for ZM331643N8TA 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 products emphasize high-reliability, low-cost supervisory and interface ICs.

The ZM33164 series belongs to Zetex's voltage supervisor product line, designed specifically for robust, minimal-component reset generation in cost-sensitive 3 V embedded systems with demanding environmental operation.

FAQ

What is the function of Pin 4 on the SOT223 package?

Pin 4 on the ZM331643N8TA SOT223 package is not internally connected and may be left unconnected or bonded to Pin 2 (V_OUT) for thermal enhancement. It does not serve an electrical function in standard operation and must not be used as a signal path or voltage reference.

Can the ZM331643N8TA be used with a 5 V supply?

Yes-the ZM331643N8TA operates across 1.0 V to 10 V supply range. At 5 V, it still asserts reset below 2.68 V, making it suitable for monitoring 3 V logic rails derived from 5 V sources. Output saturation voltage remains ≤1.0 V at 8 mA sink, ensuring compatible interfacing with 5 V-tolerant inputs.

How is reset delay implemented using the internal clamp diode?

A capacitor (C_d) is connected between V_OUT and GND, charged via an external resistor (R) from V_CC. When V_CC rises above threshold, the clamp diode discharges C_d, delaying reset release. Delay time follows T_DY = R·C_d·ln[1/(1 − V_TH/V_IN)], enabling precise millisecond-scale timing without extra components.

Does the ZM331643N8TA require an external pull-up resistor?

Yes-an external pull-up resistor is mandatory on the open-collector V_OUT pin to define the high-state voltage level. Typical values range from 10 kΩ to 100 kΩ depending on rise time and bus loading. No internal pull-up exists; omission results in undefined logic state during reset deassertion.

ZM331643N8TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Cut Tape (CT)

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 2.68V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: 2.5µs Typical Propagation Delay

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SO

ZM331643N8TA FAQ

1.How can I place an order for ZM331643N8TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZM331643N8TA 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 ZM331643N8TA reliable?

The price and inventory of ZM331643N8TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZM331643N8TA is usually 5 days.

3.What payment methods are accepted for ZM331643N8TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZM331643N8TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZM331643N8TA?

ZM331643N8TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZM331643N8TA 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 ZM331643N8TA?

For technical support, including ZM331643N8TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZM331643N8TA requirements.

6.How does Aetrix verify that ZM331643N8TA is sourced from the original manufacturer or authorized distributors?

All ZM331643N8TA 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 ZM331643N8TA meets industry standards.

7.What is the process for return or replacement of ZM331643N8TA?

All ZM331643N8TA units undergo pre-shipment inspection (PSI). If there is an issue with ZM331643N8TA, 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 ZM331643N8TA part is unused and in its original packaging.

Return procedure for ZM331643N8TA:

1.Submit a request within 90 days.

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

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