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

Diodes Incorporated ZM33164GTC

Name: ZM33164GTC
Brand: Diodes Incorporated
SKU: ZM33164GTC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZM33164GTC

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: ZM33164GTC.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT223

Quantity:: RFQ Add To RFQ list

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Inventory:3,293

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Product details

Overview

ZM33164GTC from Zetex Semiconductors is a three-terminal under-voltage monitor IC designed for power-on reset and brownout detection in 5 V microprocessor systems. It features a precise 4.3 V threshold with 60 mV hysteresis, open-collector output capable of sinking ≥10 mA, and guaranteed operation from 1.0 V to 10 V supply. Used in instrumentation and automotive ECUs for reliable system initialization.

For engineers reviewing the ZM33164GTC datasheet, ZM33164GTC pinout, ZM33164GTC application, or ZM33164GTC equivalent, key selection criteria include its fixed 4.3 V trip point, TO-92/SOT-223 package options, low quiescent current (175–260 µA), hysteresis-enabled noise immunity, and open-collector interface compatibility with TTL/CMOS logic.

Technical Context

The ZM33164GTC integrates an internal bandgap voltage reference, comparator with built-in hysteresis, and clamp diode for delay capacitor discharge. Its dual-threshold behavior (VIH = 4.15–4.45 V, VIL = 4.15–4.45 V) ensures stable reset assertion during power ramp-up and release during brownout events.

Operation begins at V_CC ≥ 1.0 V; below threshold, output remains low to hold reset. Propagation delay is 2.0 µs (V_IN 5 V → 4 V, R_L = 10 kΩ), and output saturation voltage is ≤ 0.46 V at 8 mA sink load (V_CC = 4.0 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Threshold Voltage	4.33 V typical; precisely sets reset activation point for 5 V logic rails
Hysteresis	60 mV typical; prevents chatter during slow or noisy supply transitions
Output Sink Current	10–50 mA max; drives standard pull-up resistors or logic inputs directly
Quiescent Current	175–260 µA at 5 V; enables low-power battery-backed monitoring
Supply Range	1.0–10 V; supports wide-input systems including partially discharged batteries
Propagation Delay	2.0 µs typical; ensures fast response to supply collapse without excessive timing overhead
Operating Temp	−40 °C to +85 °C; validated for industrial and automotive under-hood environments

Pinout & Package

Available in TO-92 (suffix C) and SOT-223 (suffix G) packages. ZM33164GTC uses TO-92: three leads - V_CC, GND, and open-collector output (OUT).

Pin/Terminal	Circuit Role	Design Meaning
V_CC	Positive supply input	Accepts 1.0–10 V; powers internal reference and comparator
GND	Ground reference	Return path for internal circuitry and output sink current
OUT	Open-collector output	Sinks current when V_CC < threshold; requires external pull-up for logic-high state

Key Features

Feature	Design Value
Fixed 4.3 V threshold	Optimized for 5 V microprocessor reset without external resistor networks
60 mV hysteresis	Eliminates false resets caused by supply ripple or transient dips
Clamp diode integration	Discharges external RC delay capacitor automatically, simplifying timing network design
1 V start-up capability	Generates valid reset signal even during ultra-slow power ramp-up (e.g., battery cold-start)
TO-92 and SOT-223 options	Supports legacy through-hole assembly and modern surface-mount production

Applications

Microprocessor Power-On Reset

Automotive Engine Control Unit

Use Scenario: Ensures CPU remains held in reset until 5 V rail stabilizes after power application.

IC Role / Device Role / Timing Role: Under-voltage monitor providing clean, hysteresis-stabilized reset pulse.

Use Value: Prevents code execution on marginal supply; eliminates need for discrete RC+Schmitt trigger circuits.

Use Scenario: Monitors battery-supplied 5 V domain in engine ECU during cranking (voltage sag to ~6–7 V).

IC Role / Device Role / Timing Role: Brownout detector asserting reset if V_BAT-derived 5 V drops below 4.3 V.

Use Value: Guarantees safe shutdown before MCU corruption; operates down to 1 V supply during deep sag.

Industrial PLC I/O Module

Portable Test Instrumentation

Use Scenario: Validates 5 V logic rail integrity before enabling field I/O drivers and communication interfaces.

IC Role / Device Role / Timing Role: System-level supply supervisor with fail-safe reset assertion.

Use Value: Meets IEC 61000-4-11 immunity requirements via hysteresis; supports −40 °C to +85 °C ambient.

Use Scenario: Powers up measurement subsystem only after stable 5 V rail is confirmed from Li-ion battery + DC-DC converter.

IC Role / Device Role / Timing Role: Low-quiescent-current (260 µA max) supply monitor enabling battery longevity.

Use Value: Extends runtime by avoiding unnecessary MCU wakeups during unstable power conditions.

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	4.63 V threshold; 140 µA quiescent current; SOT-23 package only	Higher trip point suits 5 V ±5% rails; lacks internal clamp diode	Select when tighter 5 V tolerance is required and external RC timing is acceptable
TLV809KDBZR	4.64 V threshold; 450 nA quiescent current; 3-pin SOT-23	Ultra-low I_Q ideal for coin-cell devices; no clamp diode; no TO-92 option	Prefer for battery life-critical portable designs where 4.64 V trip is acceptable

Compared with MAX809SEUR+T and TLV809KDBZR, ZM33164GTC offers lower threshold (4.33 V), integrated clamp diode for simplified RC delay, TO-92 compatibility, and higher sink current-making it optimal for cost-sensitive, robust 5 V microprocessor reset in industrial and automotive contexts.

Availability

ZM33164GTC is available at Aetrix Electronics and suitable for microprocessor power-on reset, automotive ECU brownout protection, and industrial PLC I/O module supervision requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ZM33164GTC 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 (now part of Diodes Incorporated) is a UK-based analog and power semiconductor specialist focused on high-reliability, application-optimized discrete and interface ICs.

The ZM33164 belongs to Zetex's precision voltage supervisor product line, engineered specifically for deterministic reset generation in 5 V microcontroller systems operating under harsh electrical and thermal conditions.

FAQ

What is the exact threshold voltage tolerance of ZM33164GTC?

The ZM33164GTC has a guaranteed threshold range of 4.15 V to 4.45 V at 25 °C, with typical value 4.33 V. This 300 mV window ensures reliable reset assertion across manufacturing variation and temperature drift, meeting MIL-STD-883 Class B screening requirements for industrial use.

Can ZM33164GTC be used with a 3.3 V microprocessor?

No - ZM33164GTC is specified for 4.3 V threshold and 5 V systems. Its minimum operating voltage is 1.0 V, but output logic levels and reset timing are calibrated for 5 V rail monitoring. For 3.3 V systems, use ZM33133 (3.3 V variant) or TLV803 series.

Does ZM33164GTC require an external pull-up resistor?

Yes - the open-collector output requires an external pull-up resistor to V_CC or another logic rail. Typical values range from 4.7 kΩ to 10 kΩ. The internal clamp diode allows direct connection of an RC delay network to OUT without additional components.

How does the internal clamp diode function in reset timing circuits?

The internal clamp diode discharges the external timing capacitor (C_d) when the output goes low, ensuring rapid and repeatable reset pulse width. This eliminates the need for an external discharge transistor or diode, reducing BOM count and PCB area in RC-based delayed reset designs.

ZM33164GTC 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

ZM33164GTC FAQ

1.How can I place an order for ZM33164GTC through Aetrix?

Please submit a Request for Quotation (RFQ) for ZM33164GTC 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 ZM33164GTC reliable?

The price and inventory of ZM33164GTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZM33164GTC is usually 5 days.

3.What payment methods are accepted for ZM33164GTC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZM33164GTC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZM33164GTC?

ZM33164GTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZM33164GTC 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 ZM33164GTC?

For technical support, including ZM33164GTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZM33164GTC requirements.

6.How does Aetrix verify that ZM33164GTC is sourced from the original manufacturer or authorized distributors?

All ZM33164GTC 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 ZM33164GTC meets industry standards.

7.What is the process for return or replacement of ZM33164GTC?

All ZM33164GTC units undergo pre-shipment inspection (PSI). If there is an issue with ZM33164GTC, 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 ZM33164GTC part is unused and in its original packaging.

Return procedure for ZM33164GTC:

1.Submit a request within 90 days.

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

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