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Analog Devices Inc. LTC2903IS6-E1#TRMPBF
- Part No.:
- LTC2903IS6-E1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC2903IS6-E1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:487
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Product details
Overview
LTC2903IS6-E1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision quad supply monitor IC in a 6-lead TSOT-23 package, designed for simultaneous monitoring of 5V, ADJ, ADJ, ADJ rails with ±1.5% threshold accuracy over temperature, 200ms reset timeout, and guaranteed RST operation down to VCC = 0.5V - used in multivoltage telecom and server power systems.
For engineers reviewing the LTC2903IS6-E1#TRMPBF datasheet, LTC2903IS6-E1#TRMPBF pinout, LTC2903IS6-E1#TRMPBF application, or LTC2903IS6-E1#TRMPBF equivalent, this page delivers verified specifications, validated pin functions, confirmed alternative parts, and real-world use cases for high-reliability power sequencing and brownout detection in industrial and networking equipment.
Technical Context
The LTC2903IS6-E1#TRMPBF implements four independent voltage comparators referenced to an internal 0.5V bandgap, with V1 fixed at 4.675V (5V, 5% threshold) and V2/V3/V4 fully adjustable via external resistor dividers. Its internal VCC is derived solely from V1, enabling operation even when other supplies are absent.
It features a single active-low open-drain RST output with weak internal pull-up to V1, low-voltage pull-down capability down to 0.2V on V1, and glitch-immune comparator design that rejects transients <150µs unless overdrive exceeds 1% of VRTX - ensuring robust reset assertion during noisy power-up/down events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 4.675V (5V × 0.95), ±1.5% over –40°C to +85°C - sets precise 5V rail monitoring point |
| V2/V3/V4 Threshold | Adjustable via resistor divider to 0.5V reference - enables custom trip points for any positive supply |
| Reset Timeout | 200ms nominal delay after all inputs exceed thresholds - prevents premature release during marginal conditions |
| Supply Current | 20µA typical - minimizes loading on monitored rails in battery- or energy-sensitive systems |
| RST Low Voltage | ≤150mV at VCC = 0.5V, IRST = 5µA - guarantees clean logic-low assertion even during deep brownout |
| Operating Temp | –40°C to +85°C (Industrial grade) - qualified for embedded telecom and server environments |
| Package | 6-lead TSOT-23 (1mm height) - enables ultra-dense PCB layout in space-constrained modules |
Pinout & Package
6-lead ThinSOT™ (TSOT-23) package: 1.90mm × 2.80mm footprint, 1.00mm max height, JEDEC MO-193 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 (Pin 1) | Main supply input & internal VCC source | Fixed 5V monitor input; powers entire IC - must be ≥0.5V for RST functionality |
| GND (Pin 2) | Analog/digital ground reference | Common return for all comparators and RST sink path - requires low-impedance connection |
| V2 (Pin 3) | Adjustable voltage input | Monitors user-defined rail via resistor divider to 0.5V reference - no internal threshold |
| V3 (Pin 4) | Adjustable voltage input | Second adjustable monitor input - identical electrical behavior to V2 and V4 |
| V4 (Pin 5) | Adjustable voltage input | Third adjustable monitor input - supports independent trip points for three distinct supplies |
| RST (Pin 6) | Open-drain reset output | Active-low signal pulled low when any input falls below threshold; internal weak pull-up to V1 |
Key Features
| Feature | Design Value |
|---|---|
| Triple adjustable inputs (V2/V3/V4) | Enables monitoring of three custom-positive rails using one 0.5V reference and external dividers - eliminates need for multiple fixed-threshold supervisors |
| Ultralow-voltage RST operation | Guaranteed RST sinking capability down to VCC = 0.5V - ensures deterministic reset hold during severe brownout or partial power loss |
| No hysteresis design | Maintains ±1.5% threshold accuracy without degrading spec via intentional hysteresis - critical for tight-margin power systems |
| Glitch-immune comparators | Rejects transients <150µs unless overdrive >1% of threshold - prevents false resets from switching noise or ESD coupling |
| Single-supply VCC derivation | VCC sourced exclusively from V1 - allows full functionality even if V2/V3/V4 are unpowered or floating |
Applications
| Telecom Power Sequencing | Server Board Power Validation |
|---|---|
Use Scenario: Monitoring 5V main, 3.3V I/O, 1.8V core, and 12V auxiliary rails during cold start and hot-swap events in optical line cards. IC Role / Device Role / Timing Role: Quad-supply supervisor asserting system reset until all rails stabilize above thresholds for 200ms. Use Value: Prevents FPGA configuration errors and memory corruption by enforcing strict power-good timing before release. |
Use Scenario: Validating 5V, 3.3V, 1.2V, and 0.9V rails on CPU daughterboards where margining and sequencing order are critical. IC Role / Device Role / Timing Role: Adjustable-input supervisor verifying each rail against its exact specification (e.g., 1.2V ±3%) via resistor-divider scaling. Use Value: Eliminates need for multiple fixed-threshold ICs - reduces BOM count and layout area while maintaining per-rail accuracy. |
| Industrial PLC Backplane | Network Switch ASIC Power-Up |
Use Scenario: Detecting undervoltage on isolated 24V, 5V, 3.3V, and 1.8V supplies feeding analog I/O, microcontroller, Ethernet PHY, and FPGA banks. IC Role / Device Role / Timing Role: Single-chip quad monitor generating unified reset signal tied to watchdog timer and firmware initialization sequence. Use Value: Guarantees coordinated reset across heterogeneous subsystems - avoids race conditions between analog and digital domains. |
Use Scenario: Ensuring clean power-up of multi-core switch ASICs requiring strict sequencing: 1.2V core → 2.5V I/O → 3.3V management → 5V PHY. IC Role / Device Role / Timing Role: Configured as V1=1.2V, V2=2.5V, V3=3.3V, V4=5V with external dividers to match exact ASIC requirements. Use Value: Enables compliance with ASIC vendor's power sequencing spec without custom logic or additional timing components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2903IS6-D1#TRMPBF | V1 = 3.3V (3.086V, 5%), V2/V3/V4 adjustable - same package and accuracy but lower primary rail threshold | Suitable for 3.3V-centric systems (e.g., legacy industrial controllers) instead of 5V-primary designs | Select D1 when main system rail is 3.3V and E1 when it is 5V; both share identical adjustable architecture and performance |
| LTC2900CS6-5#TRMPBF | Fixed thresholds only (no adjustable inputs); 16 preconfigured combinations including 5V/3.3V/2.5V/1.8V set | Lacks flexibility for non-standard rail voltages - requires redesign if supply specs change post-layout | Choose LTC2900 for cost-sensitive, fixed-rail applications where resistor dividers are undesirable; E1 preferred for design flexibility |
Compared with LTC2903IS6-D1#TRMPBF, the LTC2903IS6-E1#TRMPBF provides higher primary rail threshold (4.675V vs 3.086V) for 5V systems, while both retain triple-adjustable capability. Against LTC2900CS6-5#TRMPBF, the E1 offers field-programmable thresholds via resistors - critical for prototyping and multi-platform reuse.
Availability
LTC2903IS6-E1#TRMPBF is available at Aetrix Electronics and suitable for telecom infrastructure, network servers, and industrial PLCs requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature operation.
Supply support for LTC2903IS6-E1#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 series was designed specifically for high-accuracy, low-power quad supply monitoring in space-constrained, multirail systems - emphasizing threshold stability, ultralow-voltage operation, and flexible input configuration.
FAQ
What is the exact reset threshold voltage for V1 on the LTC2903IS6-E1#TRMPBF?
The V1 input of the LTC2903IS6-E1#TRMPBF has a guaranteed 5V, 5% reset threshold: minimum 4.600V, typical 4.675V, and maximum 4.750V over –40°C to +85°C. This value is fixed and not adjustable - unlike V2, V3, and V4, which require external resistor dividers to set their trip points relative to the internal 0.5V reference.
Can the LTC2903IS6-E1#TRMPBF monitor negative voltages like –5.2V?
No, the LTC2903IS6-E1#TRMPBF cannot monitor negative voltages. Its V2, V3, and V4 inputs are designed for positive-only supplies referenced to GND, with absolute maximum ratings of –0.3V to 6.5V. The –5.2V monitoring capability is exclusive to the LTC2903-C1 variant; the E1 variant supports only positive adjustable rails.
How does the RST output behave when V1 drops below 0.5V on the LTC2903IS6-E1#TRMPBF?
When V1 falls below 0.5V, the LTC2903IS6-E1#TRMPBF can no longer guarantee RST output functionality - the internal circuitry loses bias, and the RST pin may float or become indeterminate. The datasheet specifies guaranteed RST sinking down to VCC = 0.5V, so operation below this voltage is outside specification and not recommended for reliable reset assertion.
What external components are required for basic operation of the LTC2903IS6-E1#TRMPBF?
For basic operation, the LTC2903IS6-E1#TRMPBF requires only a 0.1µF ceramic bypass capacitor on V1 (Pin 1) to GND. V2, V3, and V4 each need a resistor divider (R1/R2) to set their trip points - no capacitors are mandatory on those pins unless noise immunity is required. An external pull-up resistor on RST is optional but recommended for faster rise times or interfacing with higher-voltage logic.
Is the LTC2903IS6-E1#TRMPBF pin-compatible with other variants in the LTC2903 family?
Yes, all LTC2903 variants - including LTC2903IS6-E1#TRMPBF, LTC2903IS6-D1#TRMPBF, and LTC2903IS6-B1#TRMPBF - share identical 6-lead TSOT-23 pinout and package dimensions. This allows direct substitution at the board level when changing variants, provided the application's voltage monitoring requirements align with the selected variant's fixed/adjustable input configuration.
LTC2903IS6-E1#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:
- 4.675V, 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-E1#TRMPBF FAQ
1.How can I place an order for LTC2903IS6-E1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2903IS6-E1#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-E1#TRMPBF reliable?
The price and inventory of LTC2903IS6-E1#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-E1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2903IS6-E1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2903IS6-E1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2903IS6-E1#TRMPBF?
LTC2903IS6-E1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2903IS6-E1#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-E1#TRMPBF?
For technical support, including LTC2903IS6-E1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2903IS6-E1#TRMPBF requirements.
6.How does Aetrix verify that LTC2903IS6-E1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2903IS6-E1#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-E1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2903IS6-E1#TRMPBF?
All LTC2903IS6-E1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2903IS6-E1#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-E1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2903IS6-E1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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