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Analog Devices Inc. LTC2903IS6-D1#TRMPBF
- Part No.:
- LTC2903IS6-D1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC2903IS6-D1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,401
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Product details
Overview
LTC2903IS6-D1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision quad supply monitor IC in 6-lead TSOT-23 package, designed for multivoltage systems requiring simultaneous monitoring of one fixed 3.3V supply and three adjustable inputs (V2/V3/V4) referenced to an internal 0.5V bandgap. It guarantees ±1.5% threshold accuracy over temperature, 200ms reset timeout, and ultralow-voltage reset operation down to VCC = 0.5V. Used in optical networking systems and cell phone base stations for reliable power-up sequencing and brownout protection.
For engineers reviewing the LTC2903IS6-D1#TRMPBF datasheet, LTC2903IS6-D1#TRMPBF pinout, LTC2903IS6-D1#TRMPBF application, or LTC2903IS6-D1#TRMPBF equivalent, key selection criteria include its 3.086V nominal V1 threshold (3.3V, 5%), adjustable 0.492–0.508V input thresholds for V2/V3/V4, 20µA typical quiescent current, open-drain RST output with V1-referenced weak pull-up, and guaranteed reset assertion below 0.5V VCC.
Technical Context
The LTC2903IS6-D1#TRMPBF implements four independent voltage comparators, each comparing an input against a precision 0.5V internal reference (for V2/V3/V4) or a trimmed 3.086V threshold (for V1). Its internal VCC is derived solely from V1 - not V2 - per datasheet Note 3 and Block Diagram BD2, enabling operation even when only V1 is present.
Reset logic holds RST low until all four inputs exceed their respective thresholds for a continuous 200ms period; the reset delay timer clears on any threshold violation. The RST output features active-low open-drain architecture with internal weak pull-up to V1 (not V2), and robust low-voltage pull-down capability down to 0.2V on V1, ensuring deterministic reset behavior during deep brownouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V (3.3V, 5%) - fixed trip point for primary supply monitoring |
| V2/V3/V4 Threshold | 0.500V ±0.008V - internal reference enables precise external resistor-divider programming |
| Threshold Accuracy | ±1.5% over full operating temperature range - ensures tight system voltage margin design |
| Reset Timeout | 200ms nominal - provides noise immunity and prevents spurious resets from transient dips |
| Quiescent Current | 20µA typical - drawn exclusively from V1, minimizing impact on monitored supplies |
| VCC Operating Range | 0.5V minimum guaranteed - enables reset assertion during severe brownout conditions |
| RST Output Type | Active-low open-drain with internal V1-referenced pull-up - supports wired-OR and flexible voltage-level interfacing |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1.00mm max height, JEDEC MO-193 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 (Pin 1) | Primary voltage input & VCC source | Supplies internal regulator; sets fixed 3.086V threshold; requires 0.1µF bypass capacitor |
| GND (Pin 2) | Ground reference | Common return for all analog and digital circuitry; must be low-impedance |
| V2 (Pin 3) | Adjustable voltage input | Compares external divided voltage to 0.5V reference; used for second supply monitoring |
| V3 (Pin 4) | Adjustable voltage input | Compares external divided voltage to 0.5V reference; used for third supply monitoring |
| V4 (Pin 5) | Adjustable voltage input | Compares external divided voltage to 0.5V reference; used for fourth supply monitoring |
| RST (Pin 6) | Open-drain reset output | Pulls low when any input falls below threshold; internal weak pull-up to V1; supports external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Triple adjustable inputs (V2/V3/V4) | Each compares to 0.5V reference, enabling precise monitoring of arbitrary positive supplies via resistor dividers |
| V1-only VCC generation | Eliminates dependency on secondary supply for internal operation - critical for single-rail or asymmetric startup |
| Ultralow-voltage reset guarantee | RST remains asserted down to VCC = 0.5V, ensuring deterministic reset during deep brownouts |
| No hysteresis implementation | Maintains ±1.5% threshold accuracy without degrading spec via intentional hysteresis-induced error |
| Glitch-immune comparator design | Proprietary transient filtering rejects short-duration noise spikes without compromising response time |
Applications
| Optical Networking Line Cards | Cell Phone Base Station Power Management |
|---|---|
Use Scenario: Monitoring multiple DC/DC converter outputs (e.g., 12V bias, 3.3V logic, 2.5V PHY, 1.8V FPGA core) on dense line cards subject to thermal drift and load transients. IC Role / Device Role / Timing Role: Quad supply monitor asserting system-wide reset if any rail drops below specification during hot-swap or cooling-fan failure events. Use Value: ±1.5% threshold accuracy over –40°C to +85°C eliminates need for derating margins, reducing risk of false resets in field-deployed equipment. | Use Scenario: Ensuring clean power-up sequencing across RF front-end, baseband processor, and memory subsystems in macrocell BTS units. IC Role / Device Role / Timing Role: Simultaneous supervision of 3.3V analog supply and three programmable rails (e.g., 5.0V PA bias, 2.8V ADC, 1.2V DSP core) with synchronized 200ms reset holdoff. Use Value: V1-only VCC sourcing allows reliable reset assertion even if auxiliary supplies are delayed or absent during cold start. |
| Multivoltage Server Management | Industrial Embedded Control Units |
Use Scenario: Validating stable operation of 5V backplane, 3.3V I/O, 1.8V SoC, and adjustable 1.0V DDR termination voltage in network server motherboards. IC Role / Device Role / Timing Role: Centralized reset generator that prevents CPU execution until all critical rails meet tolerance and remain stable for 200ms. Use Value: Adjustable V2/V3/V4 inputs eliminate need for discrete resistor networks or multiple dedicated supervisors, saving board space and BOM cost. | Use Scenario: Supervising isolated power domains (e.g., 24V field bus, 5V controller, 3.3V sensor interface, 1.8V ADC reference) in PLC modules exposed to EMI-rich factory environments. IC Role / Device Role / Timing Role: Fault-tolerant reset supervisor immune to supply glitches, with guaranteed operation down to 0.5V VCC during brownout recovery. Use Value: Low 20µA quiescent current minimizes standby power draw in battery-backed or energy-harvesting control nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2903IS6-E1#TRMPBF | V1 threshold is 4.675V (5V, 5%); otherwise identical pinout, package, and adjustable input architecture | Suitable when primary supply is 5V instead of 3.3V; no change to V2/V3/V4 divider design | Select when main rail is 5V and fixed-threshold requirement shifts accordingly |
| LTC2900CS6#TRMPBF | 16 user-selectable fixed threshold combinations (no adjustable inputs); same 6-lead SOT-23 package and ±1.5% accuracy | Requires preselection of exact voltage combinations at order time; lacks flexibility for custom rail voltages | Choose when all four rails match standard combinations (e.g., 5V/3.3V/2.5V/1.8V) and design stability is prioritized over configurability |
Compared with LTC2903IS6-E1#TRMPBF, the LTC2903IS6-D1#TRMPBF provides lower primary threshold for 3.3V-centric systems, while differing from LTC2900CS6#TRMPBF by offering field-programmable V2/V3/V4 thresholds via external resistors - enabling support for nonstandard or variable supply voltages without redesign.
Availability
LTC2903IS6-D1#TRMPBF is available at Aetrix Electronics and suitable for optical networking systems, cell phone base stations, and multivoltage server management requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across industrial temperature range.
Supply support for LTC2903IS6-D1#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC2903 family delivers precision quad supply monitoring with configurable thresholds and ultralow-voltage reset capability, targeting high-reliability infrastructure equipment where power integrity directly impacts system uptime and data integrity.
FAQ
What is the exact V1 reset threshold voltage for LTC2903IS6-D1#TRMPBF?
The LTC2903IS6-D1#TRMPBF has a nominal V1 reset threshold of 3.086V, corresponding to a 3.3V supply with ±5% tolerance. Per datasheet Electrical Characteristics table for LTC2903-D1, the guaranteed range is 3.036V (min) to 3.135V (max) over the full –40°C to +85°C operating temperature range, with ±1.5% accuracy relative to the monitored voltage.
How does the internal VCC generation work in LTC2903IS6-D1#TRMPBF?
In the LTC2903IS6-D1#TRMPBF, internal VCC is generated exclusively from the V1 input - not from V2 - as explicitly stated in datasheet Note 3 and confirmed by Block Diagram BD2. This architecture ensures the device remains functional even if V2, V3, or V4 are unpowered or disconnected, making it suitable for asymmetric power-up sequences.
Can V2, V3, and V4 monitor negative voltages in LTC2903IS6-D1#TRMPBF?
No. The LTC2903IS6-D1#TRMPBF V2, V3, and V4 inputs are designed for positive voltage monitoring only, as they compare against a 0.5V internal bandgap reference. Absolute maximum ratings specify V2/V3/V4 input range as –0.3V to 6.5V, but functional operation requires positive input above ~0.55V to ensure valid comparator behavior and specified input current limits.
What is the recommended bypass capacitor for LTC2903IS6-D1#TRMPBF?
A 0.1µF ceramic capacitor is required between V1 (Pin 1) and GND (Pin 2) for stable operation of the LTC2903IS6-D1#TRMPBF. Datasheet Section "Pin Functions" explicitly states this for option D1, and Figure TA06 confirms its placement. No bypass capacitor is required on V2, V3, or V4 unless operating in extremely noisy environments.
Does LTC2903IS6-D1#TRMPBF support manual reset functionality?
No. The LTC2903IS6-D1#TRMPBF does not integrate a manual reset input. Its RST output is purely voltage-monitoring driven. To implement manual reset, an external pushbutton must be added between RST and GND (with appropriate series resistor for ESD protection), as shown in Typical Application TA04 for the A1 variant - though TA04 uses LTC2903-A1, the open-drain RST architecture permits identical external implementation.
LTC2903IS6-D1#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- 3.086V, Adj, Adj, 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-23-6
LTC2903IS6-D1#TRMPBF FAQ
1.How can I place an order for LTC2903IS6-D1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2903IS6-D1#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 LTC2903IS6-D1#TRMPBF reliable?
The price and inventory of LTC2903IS6-D1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2903IS6-D1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2903IS6-D1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2903IS6-D1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2903IS6-D1#TRMPBF?
LTC2903IS6-D1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2903IS6-D1#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 LTC2903IS6-D1#TRMPBF?
For technical support, including LTC2903IS6-D1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2903IS6-D1#TRMPBF requirements.
6.How does Aetrix verify that LTC2903IS6-D1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2903IS6-D1#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 LTC2903IS6-D1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2903IS6-D1#TRMPBF?
All LTC2903IS6-D1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2903IS6-D1#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 LTC2903IS6-D1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2903IS6-D1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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