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

Diodes Incorporated ZSM380GTA

Name: ZSM380GTA
Brand: Diodes Incorporated
SKU: ZSM380GTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZSM380GTA

Manufacturer:: Diodes Incorporated

Category:: Supervisors

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

Datasheet:: ZSM380GTA.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT223

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ZSM380GTA from Zetex (now Diodes Incorporated) is a 3-terminal under-voltage monitor IC for microprocessor power-on reset and brown-out detection. It features a fixed 3.8 V threshold, 20 mV hysteresis, open-collector output sinking ≥10 mA, and guaranteed operation from 1.0 V to 6.5 V supply. Used in 5 V logic systems requiring reliable reset assertion during power ramp-up or sag.

For engineers reviewing the ZSM380GTA datasheet, ZSM380GTA pinout, ZSM380GTA application in microprocessor reset circuits, or ZSM380GTA equivalent for 3.8 V UVLO monitoring - this page delivers verified electrical parameters, package mapping, real-world timing behavior, and validated alternatives with documented functional trade-offs.

Technical Context

The ZSM380GTA integrates a precision bandgap voltage reference and comparator with built-in hysteresis to eliminate oscillation near threshold. Its output remains low from power-on (V_CC ≥ 1.0 V) until V_CC exceeds 3.81 V (typ), then asserts high; it reasserts low if V_CC drops below 3.79 V (typ).

It supports external RC delay networks for programmable reset timeout (T_DY = R·C_d·ln[1/(1−V_TH(MPU)/V_IN)]) and includes an internal clamp diode (V_F = 0.6–1.5 V at 10 mA) to discharge delay capacitors automatically.

Key Specifications

Parameter	Value and Actual Design Meaning
Threshold Voltage (rising)	3.81 V (typ); triggers reset release when supply crosses into valid 5 V logic window
Hysteresis	20 mV (typ); prevents chatter during slow or noisy supply transitions
Output Sink Current	10 mA (min); drives standard TTL/CMOS reset inputs without buffer stage
Supply Range	1.0–6.5 V; enables use across 3.3 V, 5 V, and mixed-rail systems
Quiescent Current	200 µA (max); supports battery-backed applications with minimal standby drain
Propagation Delay	3 µs (typ); 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

Available in SOT223 (suffix G) and TO92 (suffix C) packages. ZSM380GTA uses SOT223 with Pin 4 internally floating or tied to Pin 2 (ground). Pin 1 = V_CC, Pin 2 = GND, Pin 3 = Open-collector Output.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Supply Input	Connects to monitored V_CC; device draws current only when active or transitioning
Pin 2	Ground Reference	Return path for internal reference and output sink current; ties to system ground plane
Pin 3	Open-Collector Output	Sinks current to assert active-low reset; requires external pull-up to host V_CC
Pin 4	No Connect / Ground Tie	Internally unconnected; may be bonded to Pin 2 for thermal enhancement on PCB

Key Features

Feature	Design Value
Fixed 3.8 V Threshold	Matches standard 5 V microprocessor reset requirements without external resistor divider
Integrated Clamp Diode	Discharges external RC delay capacitor automatically-no external diode needed
Power-On Reset Generation	Asserts low output from 1.0 V up to threshold; eliminates need for separate POR circuit
Low Standby Current	200 µA max at 5 V enables >10-year battery life in coin-cell–powered instrumentation
Guaranteed Operation Down to 1 V	Supports reset assertion even during deep brown-out or backup battery fallback

Applications

Microprocessor Power-On Reset

Industrial PLC Power Monitoring

Use Scenario: Microcontroller power rail ramps from 0 V to 5 V during cold start.

IC Role / Device Role / Timing Role: Under-voltage monitor asserting active-low reset until V_CC ≥ 3.81 V and holding for ≥100 µs post-threshold.

Use Value: Prevents CPU execution before stable clock and memory bias; eliminates boot corruption.

Use Scenario: Programmable logic controller operating in factory environment with fluctuating 24 V DC input converted to 5 V.

IC Role / Device Role / Timing Role: Brown-out detector triggering watchdog reset when 5 V rail sags below 3.79 V due to load transients.

Use Value: Maintains deterministic state recovery without software intervention during line disturbances.

Automotive Body Control Module

Battery-Powered Data Logger

Use Scenario: 12 V vehicle battery drops to 9 V during cranking, causing 5 V LDO output to dip transiently.

IC Role / Device Role / Timing Role: Monitors post-regulator 5 V rail; asserts reset within 3 µs of crossing 3.79 V downward.

Use Value: Ensures MCU resets cleanly instead of executing random instructions during engine start.

Use Scenario: Lithium coin cell powers sensor node; voltage decays from 3.0 V to 2.0 V over years.

IC Role / Device Role / Timing Role: Detects end-of-life battery via 3.8 V threshold violation; triggers graceful shutdown sequence.

Use Value: Preserves last valid measurement and avoids corrupted flash writes during undervoltage.

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	3.08 V threshold, 140 ms fixed reset timeout, SOT23-3	Designed for fixed-delay reset; lacks programmable RC timing and clamp diode	Select when deterministic 140 ms reset hold time is required and 3.08 V threshold matches system needs
TLV803DBZR	3.08 V threshold, 200 ms min reset pulse width, push-pull output	No internal clamp diode; requires external diode for RC delay discharge; higher quiescent current (600 nA)	Choose for push-pull drive compatibility and tighter temp drift (±0.5% vs ±1.5%)

Compared with ZSM380GTA, MAX809TRD2 offers fixed timing but no RC programmability or clamp diode, while TLV803DBZR provides superior accuracy and push-pull output but adds external component overhead and lacks auto-discharge capability.

Availability

ZSM380GTA is available at Aetrix Electronics and suitable for microprocessor reset generation, industrial power monitoring, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ZSM380GTA 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 ZSM380 belongs to Zetex's supervisor IC product line, engineered specifically for robust, low-component-count reset solutions in cost-sensitive embedded systems with wide input voltage variation.

FAQ

What is the function of Pin 4 on the ZSM380GTA SOT223 package?

Pin 4 is internally unconnected but may be bonded to Pin 2 (GND) during assembly to improve thermal conduction to the PCB. It must not be used as a signal or power terminal. When left floating, it has no electrical effect; when tied to ground, it enhances heat dissipation under sustained 10 mA sink conditions.

Can ZSM380GTA monitor a 3.3 V supply directly?

No - its fixed 3.8 V threshold is optimized for 5 V systems. Monitoring 3.3 V rails would cause permanent reset assertion. For 3.3 V applications, use a supervisor with 2.93 V or 3.08 V threshold (e.g., TPS3808G18 or MAX6326) or add a resistive divider (not recommended due to leakage and accuracy loss).

How does the internal clamp diode affect RC reset delay design?

The internal clamp diode (V_F ≈ 0.9 V typ) discharges the external delay capacitor automatically when the output goes high, eliminating the need for an external diode. This simplifies layout, reduces BOM count, and ensures consistent delay timing independent of external component tolerances.

Is ZSM380GTA qualified for automotive AEC-Q100?

No - ZSM380GTA was designed for industrial-grade operation (−40°C to +85°C) and is not AEC-Q100 qualified. For automotive applications, Diodes Incorporated recommends the APX803L (AEC-Q100 Grade 2, 3.08 V) or APX823 (adjustable threshold, Grade 2) as drop-in replacements with full qualification documentation.

ZSM380GTA 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:: 3.8V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: 3µs Typical Propagation Delay

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223-3

ZSM380GTA FAQ

1.How can I place an order for ZSM380GTA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZSM380GTA 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 ZSM380GTA reliable?

The price and inventory of ZSM380GTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSM380GTA is usually 5 days.

3.What payment methods are accepted for ZSM380GTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSM380GTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZSM380GTA?

ZSM380GTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZSM380GTA 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 ZSM380GTA?

For technical support, including ZSM380GTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSM380GTA requirements.

6.How does Aetrix verify that ZSM380GTA is sourced from the original manufacturer or authorized distributors?

All ZSM380GTA 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 ZSM380GTA meets industry standards.

7.What is the process for return or replacement of ZSM380GTA?

All ZSM380GTA units undergo pre-shipment inspection (PSI). If there is an issue with ZSM380GTA, 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 ZSM380GTA part is unused and in its original packaging.

Return procedure for ZSM380GTA:

1.Submit a request within 90 days.

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

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