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

Diodes Incorporated ZSM330C

Name: ZSM330C
Brand: Diodes Incorporated
SKU: ZSM330C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZSM330C

Manufacturer:: Diodes Incorporated

Category:: Supervisors

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: ZSM330C.pdf

Description:: IC SUPERVISOR 1 CHANNEL TO92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ZSM330C from Zetex Semiconductors is a three-terminal under-voltage monitor IC designed for power-on reset and supply supervision in 3.3 V microprocessor systems. It features a precise 3.1 V threshold, 20 mV hysteresis, open-collector output capable of sinking ≥10 mA, and guaranteed operation from 1.0 V to 6.5 V supply. Used in battery-powered instrumentation and automotive ECUs where reliable reset generation is critical.

For engineers reviewing the ZSM330C datasheet, ZSM330C pinout, ZSM330C application, or ZSM330C equivalent, key selection criteria include threshold accuracy (±90 mV over −40°C to +85°C), low quiescent current (120–180 µA at 3.3 V), propagation delay (2.2 µs typical), and TO92 package compatibility with legacy through-hole PCB layouts.

Technical Context

The ZSM330C integrates an internal bandgap voltage reference, comparator with built-in hysteresis, and clamp diode for external RC delay networks. Its comparator triggers on both rising and falling supply edges, enabling automatic power-on and brown-out reset functions without external logic.

Operation is fully specified from 1.0 V input - below threshold the output remains low; above threshold it goes high-impedance. The open-collector output interfaces directly with TTL/CMOS inputs using only one pull-up resistor, and the internal clamp diode discharges external timing capacitors to ensure deterministic reset release timing.

Key Specifications

Parameter	Value and Actual Design Meaning
Threshold Voltage (V_IH)	3.01–3.15 V - defines minimum supply level to release reset in 3.3 V systems
Hysteresis (V_H)	10–50 mV - prevents oscillation during slow-rising or noisy supply transitions
Output Sink Current	10–60 mA - drives standard logic inputs or reset latches without buffer stages
Quiescent Current	120–180 µA at 3.3 V - enables long-term battery operation in portable equipment
Supply Range	1.0–6.5 V - supports single-cell Li-ion, NiMH, and regulated 3.3/5 V rails
Propagation Delay	2.2 µs typical - ensures fast response to brown-out events without compromising noise immunity
Operating Temp	−40°C to +85°C - qualified for industrial and automotive under-hood environments

Pinout & Package

Supplied in TO92 through-hole package (suffix C), with pin 1 = V_IN, pin 2 = GND, pin 3 = OUTPUT (open-collector).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Supply Input (V_IN)	Monitored voltage rail; device draws current only from this pin
Pin 2	Ground (GND)	Reference node for internal comparator and clamp diode cathode
Pin 3	Open-Collector Output	Sinks current when V_IN < threshold; requires external pull-up for logic-high state

Key Features

Feature	Design Value
Internal clamp diode	Discharges external RC timing capacitor automatically, eliminating need for discrete discharge path
Guaranteed operation from 1 V	Enables use in ultra-low-voltage wake-up circuits and energy-harvesting systems
20 mV typical hysteresis	Prevents chatter during marginal supply conditions without requiring external feedback resistors
TO92 and SOT223 packaging	Supports both legacy through-hole assembly and modern surface-mount production
Low standby current	Reduces system-level power budget impact in always-on monitoring applications

Applications

Microprocessor Power-On Reset

Automotive Body Control Module

Use Scenario: Ensures clean boot sequence after cold start or battery reconnection in embedded controllers.

IC Role / Device Role / Timing Role: Under-voltage supervisor generating active-low reset pulse until V_CC exceeds 3.1 V and stabilizes.

Use Value: Eliminates need for external RC network and Schmitt trigger; 2.2 µs delay ensures sub-microsecond response to supply faults.

Use Scenario: Monitors 12 V battery-derived 3.3 V rail in door module ECUs exposed to load-dump transients.

IC Role / Device Role / Timing Role: Brown-out detector asserting reset when alternator failure drops regulated supply below 3.1 V.

Use Value: 1.0–6.5 V operating range accommodates wide input variation; −40°C to +85°C rating matches under-dash thermal requirements.

Battery-Powered Data Logger

Industrial Sensor Transmitter

Use Scenario: Maintains data integrity during lithium primary cell discharge from 3.6 V to 2.8 V.

IC Role / Device Role / Timing Role: Threshold monitor disabling MCU when supply falls below safe operating voltage for flash writes.

Use Value: 120–180 µA quiescent current extends battery life; internal hysteresis avoids repeated resets near cutoff.

Use Scenario: Supervises isolated 3.3 V supply in 4–20 mA loop-powered temperature transmitter.

IC Role / Device Role / Timing Role: Fault detector triggering safe shutdown before analog front-end bias collapse.

Use Value: Open-collector output interfaces directly with optocoupler input; clamp diode simplifies RC-based watchdog timeout integration.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX809SCSA+	3.08 V threshold, ±1.5% accuracy, 1.2 µs propagation delay, SOT23-3 package only	Lacks internal clamp diode; requires external discharge path for RC delay	Preferred for space-constrained designs needing tighter threshold tolerance and faster response
TLV809K33DBZR	3.3 V threshold, 1.8–6 V supply, 0.5 µA quiescent current, SOT23-3	Higher threshold unsuitable for 3.3 V systems with tight margins; no clamp diode	Selected when ultra-low power dominates over precise 3.1 V trip point and integrated timing discharge

Compared with MAX809SCSA+ and TLV809K33DBZR, the ZSM330C offers unique value in TO92-compatible designs requiring internal clamp diode functionality, 3.1 V threshold alignment with 3.3 V logic, and proven robustness across −40°C to +85°C without derating.

Availability

ZSM330C is available at Aetrix Electronics and suitable for microprocessor reset, automotive body electronics, battery-powered instrumentation, and industrial sensor transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ZSM330C 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; legacy Zetex products maintain industrial-grade qualification and long-term availability.

The ZSM series delivers precision voltage supervisors optimized for cost-sensitive, high-reliability embedded systems where predictable reset behavior and minimal external components are essential.

FAQ

What is the function of the internal clamp diode in the ZSM330C?

The internal clamp diode connects between the output pin and ground, providing a controlled discharge path for external RC timing capacitors. This eliminates the need for a separate transistor or diode in reset delay circuits, ensuring repeatable release timing and reducing component count in power-on reset implementations.

Can the ZSM330C operate reliably below 3.3 V supply?

Yes - the ZSM330C is fully specified to operate from 1.0 V to 6.5 V. Its internal reference and comparator remain functional down to 1.0 V, allowing it to generate valid reset signals even during deep brown-out or single-cell battery discharge, with output held low until V_IN exceeds 3.1 V.

Is the ZSM330C pin-compatible with the SOT223-packaged ZSM330G?

No - the ZSM330C (TO92) and ZSM330G (SOT223) share identical electrical specifications but differ in pinout and physical layout. TO92 uses linear pin 1–2–3 assignment; SOT223 has pin 4 floating or tied to pin 2, requiring PCB redesign for substitution.

Does the ZSM330C require an external pull-up resistor on its output?

Yes - the output is open-collector, so an external pull-up resistor to the monitored supply or logic rail is mandatory to establish a defined high state. Typical values range from 10 kΩ to 100 kΩ depending on rise time and bus loading requirements.

ZSM330C Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 3.08V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: 2.2µs Typical Propagation Delay

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92

ZSM330C FAQ

1.How can I place an order for ZSM330C through Aetrix?

Please submit a Request for Quotation (RFQ) for ZSM330C 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 ZSM330C reliable?

The price and inventory of ZSM330C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSM330C is usually 5 days.

3.What payment methods are accepted for ZSM330C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSM330C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZSM330C?

ZSM330C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZSM330C 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 ZSM330C?

For technical support, including ZSM330C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSM330C requirements.

6.How does Aetrix verify that ZSM330C is sourced from the original manufacturer or authorized distributors?

All ZSM330C 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 ZSM330C meets industry standards.

7.What is the process for return or replacement of ZSM330C?

All ZSM330C units undergo pre-shipment inspection (PSI). If there is an issue with ZSM330C, 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 ZSM330C part is unused and in its original packaging.

Return procedure for ZSM330C:

1.Submit a request within 90 days.

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

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