My Inquiry
My Account
Analog Devices Inc. LTC1728ES5-1.8#TRMPBF
- Part No.:
- LTC1728ES5-1.8#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC1728ES5-1.8#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:816
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1728ES5-1.8#TRMPBF from Analog Devices is a micropower triple supply monitor IC in 5-lead SOT-23 package, designed to supervise 3.0V, 1.8V, and adjustable (≥1.0V) supply rails with ±1.5% threshold accuracy over temperature. It provides a single active-low open-drain RESET output with 200ms delay, guaranteed operation down to VCC3 ≥ 1V or VCC18 ≥ 1V, and consumes only 10µA typical supply current. It is used in portable battery-powered equipment for reliable power-on reset and brownout detection.
For engineers reviewing the LTC1728ES5-1.8#TRMPBF datasheet, LTC1728ES5-1.8#TRMPBF pinout, LTC1728ES5-1.8#TRMPBF application, or LTC1728ES5-1.8#TRMPBF equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in Analog Devices' Rev. E specification and package documentation.
Technical Context
The LTC1728ES5-1.8#TRMPBF monitors three independent supply inputs: VCC3 (3.0V sense/supply), VCC18 (1.8V sense/supply), and VCCA (adjustable ≥1.0V input). Its internal bandgap reference enables accurate trip-point comparison across –40°C to +85°C, with glitch immunity achieved via 10% hysteresis-equivalent input filtering and a fixed 200ms reset timer.
Power is autonomously drawn from whichever of VCC3 or VCC18 reaches ≥1V first, ensuring RST remains asserted until both supplies exceed their respective thresholds (VRT3 = 2.76–2.85V, VRT18 = 1.656–1.710V, VRTA = 0.985–1.015V) and remain stable for 200ms. No individual comparator outputs are provided - unlike the LTC1727 - making it a dedicated system-reset solution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Monitor Inputs | VCC3 (3.0V rail), VCC18 (1.8V rail), VCCA (adjustable ≥1.0V rail) - supports dual-rail + auxiliary voltage supervision |
| Reset Threshold Accuracy | ±1.5% over –40°C to +85°C - ensures reliable reset assertion without false triggering across industrial temperature range |
| Reset Pulse Width | 140–280ms (min–max over temp) - guarantees sufficient hold time for microprocessor initialization |
| Supply Current | 10µA typical - enables integration into ultra-low-power battery-operated systems without significant drain |
| Minimum Operating Voltage | VCC3 or VCC18 ≥ 1V - allows early reset assertion during slow-ramp power-up sequences |
| Output Type | Active-low open-drain RST with weak internal 6µA pull-up to VCC3 - compatible with 3.0V/3.3V logic and supports external pull-up to higher voltages |
| Undervoltage Detection Delay | 110µs - fast response to supply droop, enabling timely system shutdown or recovery |
Pinout & Package
Package: 5-Lead Plastic TSOT-23 (S5), 1.90mm × 1.50mm footprint, 0.95mm height, JEDEC MO-193 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST (Pin 1) | Active-low reset output | Open-drain output asserted low when any monitored supply falls below threshold; requires external pull-up for logic-high state |
| GND (Pin 2) | Ground reference | Common return path for all internal comparators and bandgap reference; must be low-impedance connection |
| VCCA (Pin 3) | Adjustable supply monitor input | High-impedance input for monitoring auxiliary rails ≥1.0V; threshold = 1.000V ±15mV; unused pin may be tied to VCC3 or VCC18 |
| VCC3 (Pin 5) | 3.0V supply monitor and primary power source | Senses 3.0V rail (threshold 2.76–2.85V); powers device when ≥1V and higher than VCC18; bypass with ≥0.1µF ceramic capacitor |
| VCC18 (Pin 4) | 1.8V supply monitor and alternate power source | Senses 1.8V rail (threshold 1.656–1.710V); powers device when ≥1V and higher than VCC3; bypass with ≥0.1µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring in SOT-23 | Enables full 3-rail supervision (3.0V, 1.8V, adjustable) in <2mm² footprint - ideal for space-constrained portable designs |
| Autonomous dual-source power architecture | Draws operating power from whichever of VCC3 or VCC18 rises first ≥1V - eliminates need for external bias supply |
| Guaranteed reset assertion at 1V | Ensures RST stays low even during deep brownout conditions where VCC3 or VCC18 drops to 1V - improves system robustness |
| Glitch-immune input detection | Requires ≥10% threshold overdrive for ≥50µs to trigger - rejects noise spikes and ripple without external RC filtering |
| 200ms reset timeout with temperature stability | Fixed delay meets µP reset timing requirements across –40°C to +85°C; no external timing components needed |
Applications
| Portable Battery-Powered Equipment | Notebook Computers |
|---|---|
Use Scenario: Supervising main 3.0V system rail, 1.8V core logic rail, and adjustable DC/DC feedback node in handheld medical devices. IC Role / Device Role / Timing Role: Triple-supply monitor providing synchronized power-on reset and brownout protection for ARM Cortex-M4-based controller. Use Value: Prevents firmware execution before stable 3.0V/1.8V rails are established; 10µA quiescent current extends battery life by >12 months in sleep mode. |
Use Scenario: Monitoring 3.0V I/O rail, 1.8V DDR3 memory rail, and adjustable 1.05V CPU core rail during dynamic voltage scaling. IC Role / Device Role / Timing Role: System-level reset generator that asserts RST if any rail dips below spec during thermal throttling or load transients. Use Value: Eliminates need for discrete supervisor + RC timing network; ±1.5% threshold accuracy prevents premature resets during rail droop. |
| Intelligent Instruments | Network Servers (Management Controllers) |
Use Scenario: Ensuring clean startup of 3.0V analog front-end, 1.8V FPGA configuration rail, and adjustable 1.2V sensor interface rail in portable oscilloscopes. IC Role / Device Role / Timing Role: Single-chip reset supervisor replacing multiple discrete comparators and timers in mixed-signal measurement subsystems. Use Value: Reduces BOM count by 4 components; 5-lead SOT-23 simplifies layout and improves thermal performance vs. larger packages. |
Use Scenario: Power sequencing verification for BMC (Baseboard Management Controller) on server motherboards with 3.0V management rail, 1.8V SPI flash rail, and adjustable 1.0V PMBus reference. IC Role / Device Role / Timing Role: Fail-safe reset source for out-of-band management processor, asserting RST if any critical rail fails during hot-swap events. Use Value: Guarantees RST remains asserted until all rails stabilize for ≥200ms - satisfies IPMI 2.0 power-good timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1985-1.8 | Push-pull RST output (not open-drain); same 3.0V/1.8V/adjustable monitoring; 1.2V minimum VCCA threshold | Eliminates need for external pull-up resistor but incompatible with wired-OR reset buses | Select when driving CMOS inputs directly without level-shifting or bus arbitration |
| LTC1326-2.5 | Monitors 2.5V/3.3V/adjustable rails (not 3.0V/1.8V); ±0.75% threshold accuracy; 8-lead MSOP package | Higher accuracy and different voltage combinations - suitable for legacy 2.5V logic systems, not direct replacement | Select only if redesigning for 2.5V/3.3V rails and requiring tighter tolerance; requires PCB layout change |
Compared with LTC1728ES5-1.8#TRMPBF, LTC1985-1.8 offers push-pull drive for simpler interfacing but sacrifices bus-sharing capability, while LTC1326-2.5 provides superior accuracy at the cost of incompatible rail voltages and larger footprint - neither is pin-compatible, and both require schematic and layout revision.
Availability
LTC1728ES5-1.8#TRMPBF is available at Aetrix Electronics and suitable for portable battery-powered equipment, notebook computers, intelligent instruments, and network server management controllers requiring stable component supply and guaranteed long-term availability.
Supply support for LTC1728ES5-1.8#TRMPBF 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1728 belongs to Analog Devices' precision power monitoring product line, engineered specifically for low-power, multi-rail systems where reliability, small size, and guaranteed reset behavior under brownout conditions are critical design requirements.
FAQ
What is the exact reset threshold voltage for the 3.0V supply input on the LTC1728ES5-1.8#TRMPBF?
The VCC3 input threshold for LTC1728ES5-1.8#TRMPBF is specified as 2.760V (min), 2.805V (typ), and 2.850V (max) over the full –40°C to +85°C temperature range. This 3.0V rail monitor is factory-trimmed to ±1.5% accuracy and does not require external calibration. The threshold applies exclusively to the VCC3 pin and is independent of VCC18 or VCCA settings.
Can the LTC1728ES5-1.8#TRMPBF monitor a 3.3V rail instead of 3.0V?
No - the LTC1728ES5-1.8#TRMPBF is specifically configured for 3.0V (not 3.3V) and 1.8V rails. Its VCC3 pin has a fixed 2.76–2.85V threshold optimized for 3.0V nominal systems. For 3.3V monitoring, use LTC1728ES5-3.3#TRMPBF (VRT3 = 3.036–3.135V) or LTC1728ES5-5#TRMPBF (with override mode). Substituting 3.3V on VCC3 of LTC1728ES5-1.8#TRMPBF will cause premature reset deassertion.
Does the LTC1728ES5-1.8#TRMPBF provide individual supply status outputs like the LTC1727?
No - the LTC1728ES5-1.8#TRMPBF provides only a single active-low open-drain RST output. Unlike the LTC1727, it omits individual comparator outputs (COMP3, COMP18, COMPA). This simplifies design for applications needing only system-wide reset, reduces pin count, and lowers cost - but precludes per-rail fault isolation without additional circuitry.
What is the minimum valid voltage on VCCA for the LTC1728ES5-1.8#TRMPBF to operate correctly?
The VCCA input on LTC1728ES5-1.8#TRMPBF has a fixed threshold of 0.985–1.015V. To ensure correct comparator operation, VCCA must be ≥1.0V and sourced from a stable, low-noise node. If unused, VCCA may be tied to VCC3 (3.0V) or VCC18 (1.8V); tying to ground or floating is prohibited and will cause undefined RST behavior.
Is the LTC1728ES5-1.8#TRMPBF RoHS-compliant and lead-free?
Yes - the "#TRMPBF" suffix explicitly denotes lead-free (Pb-free), RoHS-compliant packaging with tape-and-reel delivery (500-unit reels). The device uses matte tin lead finish per JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), and the S5 package conforms to IPC/JEDEC standard MO-193 for TSOT-23.
LTC1728ES5-1.8#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.683V, 2.805V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LTC1728ES5-1.8#TRMPBF FAQ
1.How can I place an order for LTC1728ES5-1.8#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1728ES5-1.8#TRMPBF 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 LTC1728ES5-1.8#TRMPBF reliable?
The price and inventory of LTC1728ES5-1.8#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1728ES5-1.8#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC1728ES5-1.8#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1728ES5-1.8#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1728ES5-1.8#TRMPBF?
LTC1728ES5-1.8#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1728ES5-1.8#TRMPBF 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 LTC1728ES5-1.8#TRMPBF?
For technical support, including LTC1728ES5-1.8#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1728ES5-1.8#TRMPBF requirements.
6.How does Aetrix verify that LTC1728ES5-1.8#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1728ES5-1.8#TRMPBF 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 LTC1728ES5-1.8#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1728ES5-1.8#TRMPBF?
All LTC1728ES5-1.8#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1728ES5-1.8#TRMPBF, 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 LTC1728ES5-1.8#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1728ES5-1.8#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1728ES5-1.8#TRMPBF Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
