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Analog Devices Inc. LTC2903CS6-B1#TRPBF
- Part No.:
- LTC2903CS6-B1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC2903CS6-B1#TRPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL TSOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2903CS6-B1#TRPBF from Analog Devices (formerly Linear Technology) is a precision quad supply monitor IC in a 6-lead TSOT-23 package, designed to simultaneously supervise 5V, 3.3V, 2.5V, and 1.8V rails with ±1.5% threshold accuracy over temperature, 200ms reset delay, and active-low open-drain RST output - used in multivoltage systems like network servers and optical networking equipment.
For engineers reviewing the LTC2903CS6-B1#TRPBF datasheet, LTC2903CS6-B1#TRPBF pinout, LTC2903CS6-B1#TRPBF application, or LTC2903CS6-B1#TRPBF equivalent, key selection considerations include guaranteed 0.5V ultralow-voltage reset operation, 20µA typical quiescent current, 10% undervoltage monitoring tolerance, glitch immunity, and SOT-23 footprint compatibility for space-constrained power management designs.
Technical Context
The LTC2903CS6-B1#TRPBF implements four independent voltage comparators referenced to a bandgap-derived 0.5V internal reference, each with dedicated input thresholds (VRT50 = 4.425V, VRT33 = 2.921V, VRT25 = 2.213V, VRT18 = 1.593V). Its internal VCC is auto-generated from the higher of V1 or V2 inputs, enabling operation down to 0.5V supply.
It features a 200ms reset timeout counter that resets on any threshold violation, low-voltage pull-down circuitry sustaining RST low down to 0.2V input, and an integrated weak internal pull-up (≈10µA to V2) on the open-drain RST pin - eliminating need for external bias in basic applications while supporting wired-OR configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Monitored Voltages | 5V (V1), 3.3V (V2), 2.5V (V3), 1.8V (V4) - fixed thresholds per variant B1; no resistor programming required |
| Threshold Accuracy | ±1.5% over full temperature range - ensures reliable reset assertion without over-margining system supply tolerances |
| Reset Delay | 200ms nominal (140–260ms min/max) - provides stable power-up sequencing and noise immunity against transient dips |
| Supply Current | 20µA typical - enables use in always-on, battery-backed, or ultra-low-power subsystems |
| RST Output Type | Active-low open-drain with internal ~10µA pull-up to V2 - supports level-shifting, wired-OR, and external pull-up for faster rise times |
| Ultralow Reset Voltage | Guaranteed RST sink capability down to VCC = 0.5V (VOL ≤ 150mV at 5µA) - maintains deterministic reset state during deep brownout |
| Operating Temp Range | –40°C to +85°C (I-grade) - qualified for industrial and telecom infrastructure environments |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, JEDEC MO-193 compliant, 1.90mm × 2.80mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 (Pin 1) | Main voltage input / VCC source | Monitors 5V rail; supplies internal VCC when ≥ V2; bypass with 0.1µF capacitor |
| GND (Pin 2) | Ground reference | Common return for all comparators, reset logic, and internal bandgap |
| V2 (Pin 3) | Secondary voltage input / VCC source | Monitors 3.3V rail; supplies VCC if > V1; bypass with 0.1µF capacitor |
| V3 (Pin 4) | Tertiary voltage input | Monitors 2.5V rail; assists low-voltage RST pull-down below 1V |
| V4 (Pin 5) | Quaternary voltage input | Monitors 1.8V rail; contributes to RST pull-down strength in brownout conditions |
| RST (Pin 6) | Reset logic output | Open-drain active-low signal; pulled low when any input < threshold; held low for 200ms after all recover |
Key Features
| Feature | Design Value |
|---|---|
| Quad simultaneous monitoring | Four independent comparators enable single-chip supervision of heterogeneous supply domains (5V/3.3V/2.5V/1.8V) |
| Glitch-immune comparator design | Proprietary transient filtering rejects spikes < 100µs duration unless overdrive exceeds 1% of threshold - prevents false resets from EMI or switching noise |
| Low-voltage RST hold-down | Pull-down circuit sustains RST low with as little as 0.2V on V1/V2/V3 - eliminates floating reset node risk during deep undervoltage |
| No hysteresis penalty | Maintains ±1.5% accuracy without adding comparator hysteresis - avoids degrading specified threshold precision |
| Auto-generated VCC | VCC derived internally from greater of V1 or V2 - eliminates need for separate bias supply and simplifies system power architecture |
Applications
| Network Server Power Sequencing | Optical Transceiver Module Supervision |
|---|---|
Use Scenario: Monitoring 5V bias, 3.3V logic, 2.5V PHY, and 1.8V SerDes rails in a 1RU server backplane with strict power-up order requirements. IC Role / Device Role / Timing Role: Quad-supply supervisor enforcing 200ms reset assertion window and coordinated release across mixed-voltage domains. Use Value: Prevents CPU lockup or PCIe link training failure by ensuring all rails stabilize before releasing system reset. | Use Scenario: Supervising isolated DC/DC outputs powering laser drivers, TIA amplifiers, and digital control logic in SFP+ modules. IC Role / Device Role / Timing Role: Fault-detection monitor with sub-1V RST hold-down capability during hot-swap insertion or thermal shutdown events. Use Value: Guarantees clean reset assertion even during partial power loss - avoiding laser bias instability or data corruption. |
| Cellular Base Station RF Front-End | Multivoltage FPGA Power Management |
Use Scenario: Validating 5V PA bias, 3.3V LNA supply, 2.5V ADC reference, and 1.8V digital core in macrocell remote radio units. IC Role / Device Role / Timing Role: Precision voltage guardian with ±1.5% threshold accuracy over –40°C to +85°C ambient. Use Value: Eliminates need for derating margins in high-temperature outdoor deployments - reducing system-level voltage headroom requirements. | Use Scenario: Ensuring reliable configuration of Xilinx Artix-7 or Intel Cyclone V FPGAs requiring coordinated 5V/3.3V/2.5V/1.8V rail ramp-up. IC Role / Device Role / Timing Role: Single-component solution replacing discrete reset ICs and RC networks - minimizing BOM count and layout area. Use Value: Reduces PCB real estate by >70% vs. dual/triple supervisor solutions while maintaining timing integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2900CS6#TRPBF | 16 selectable voltage combinations via pin-strapping; same ±1.5% accuracy and 200ms delay but lacks ultralow 0.5V reset guarantee | Preferred where flexible rail assignment (e.g., 3.3V/2.5V/1.8V/1.2V) is needed over fixed B1 thresholds | Select LTC2900CS6#TRPBF only if programmable threshold mapping is required; LTC2903CS6-B1#TRPBF offers superior brownout resilience |
| LTC2902CS6-3.3#TRPBF | Includes RST disable function and adjustable tolerance (5%/10%); identical pinout and B1 voltage set but adds EN pin for reset inhibition | Suitable for systems requiring dynamic reset suppression during firmware updates or debug modes | Choose LTC2902CS6-3.3#TRPBF when RST disable capability is mandatory; otherwise LTC2903CS6-B1#TRPBF delivers lower cost and simpler integration |
Compared with LTC2900CS6#TRPBF and LTC2902CS6-3.3#TRPBF, the LTC2903CS6-B1#TRPBF prioritizes guaranteed ultralow-voltage reset operation and minimal quiescent current - making it optimal for thermally stressed or energy-constrained multivoltage platforms where deterministic brownout behavior is non-negotiable.
Availability
LTC2903CS6-B1#TRPBF is available at Aetrix Electronics and suitable for network servers, optical transceivers, cellular base stations, and FPGA-based embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature performance.
Supply support for LTC2903CS6-B1#TRPBF 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, datasheet documentation, and manufacturing continuity for the LTC portfolio.
The LTC2903 series belongs to Linear's precision power supervision product line, engineered specifically for high-reliability multivoltage systems where accurate, glitch-immune, and ultralow-voltage reset behavior is critical to system boot integrity.
FAQ
What is the guaranteed minimum operating voltage for LTC2903CS6-B1#TRPBF to assert RST?
The LTC2903CS6-B1#TRPBF guarantees RST output sink capability down to VCC = 0.5V, with VOL ≤ 150mV at 5µA load. This is achieved via dedicated low-voltage pull-down circuitry on V1, V2, and V3 inputs - enabling deterministic reset assertion during deep brownout conditions where other supervisors fail.
Does LTC2903CS6-B1#TRPBF require external resistors to set its voltage thresholds?
No. The LTC2903CS6-B1#TRPBF has factory-trimmed fixed thresholds for 5V (V1), 3.3V (V2), 2.5V (V3), and 1.8V (V4) - no external resistor dividers are needed. This distinguishes it from adjustable variants like LTC2903-D1/E1 and eliminates calibration overhead and component tolerance errors.
What is the reset timeout behavior of LTC2903CS6-B1#TRPBF during partial supply recovery?
The LTC2903CS6-B1#TRPBF holds RST low until all four monitored voltages (5V, 3.3V, 2.5V, 1.8V) remain above their respective thresholds for a continuous 200ms period. If any input dips below threshold during this window, the timer resets - ensuring robust immunity to supply ripple and sequential rail ramp-up artifacts.
Can LTC2903CS6-B1#TRPBF be used in systems with negative supply rails?
No. The LTC2903CS6-B1#TRPBF is rated for V1/V2/V4 inputs from –0.3V to +6.5V and V3 from 2.7V or (VCC + 0.3V); it does not support negative monitoring like the LTC2903-C1 variant (–5.2V capable). For negative rail supervision, LTC2903CS6-C1#TRPBF is the appropriate variant.
How does the internal VCC generation work in LTC2903CS6-B1#TRPBF?
The LTC2903CS6-B1#TRPBF generates its internal VCC automatically from the higher of the V1 or V2 input voltages - no external bias supply is needed. When V1 ≥ V2, VCC ≈ V1; when V2 > V1, VCC ≈ V2. This architecture enables operation across mixed-supply systems and eliminates dependency on a dedicated VCC rail.
LTC2903CS6-B1#TRPBF 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:
- 1.593V, 2.213V, 2.921V, 4.425V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC2903CS6-B1#TRPBF FAQ
1.How can I place an order for LTC2903CS6-B1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2903CS6-B1#TRPBF 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 LTC2903CS6-B1#TRPBF reliable?
The price and inventory of LTC2903CS6-B1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2903CS6-B1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2903CS6-B1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2903CS6-B1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2903CS6-B1#TRPBF?
LTC2903CS6-B1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2903CS6-B1#TRPBF 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 LTC2903CS6-B1#TRPBF?
For technical support, including LTC2903CS6-B1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2903CS6-B1#TRPBF requirements.
6.How does Aetrix verify that LTC2903CS6-B1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2903CS6-B1#TRPBF 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 LTC2903CS6-B1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2903CS6-B1#TRPBF?
All LTC2903CS6-B1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2903CS6-B1#TRPBF, 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 LTC2903CS6-B1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2903CS6-B1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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