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Analog Devices Inc. LTC2903CS6-B1#TRMPBF
- Part No.:
- LTC2903CS6-B1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC2903CS6-B1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL TSOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2903CS6-B1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision quad supply monitor IC in a 6-lead TSOT-23 package, designed to supervise four independent voltage rails-5V, 3.3V, 2.5V, and 1.8V-with ±1.5% threshold accuracy over temperature. It delivers active-low open-drain reset output with 200ms delay, ultralow 20µA quiescent current, and guaranteed reset assertion down to VCC = 0.5V. It is used in multivoltage systems such as optical networking equipment and network servers for reliable power-on sequencing and brownout protection.
For engineers reviewing the LTC2903CS6-B1#TRMPBF datasheet, LTC2903CS6-B1#TRMPBF pinout, LTC2903CS6-B1#TRMPBF application, or LTC2903CS6-B1#TRMPBF equivalent, key selection criteria include guaranteed 10% undervoltage thresholds per rail, low-voltage pull-down capability below 1V, glitch-immune comparator design, and compatibility with SOT-23 layout constraints in space-constrained embedded power management.
Technical Context
The LTC2903CS6-B1#TRMPBF employs four independent bandgap-referenced comparators, each monitoring a fixed threshold (5V/3.3V/2.5V/1.8V) without hysteresis, relying instead on transient-duration filtering and a 200ms reset timeout counter to reject noise. Its internal VCC is auto-generated from the higher of V1 or V2 inputs, enabling operation even when only one monitored rail is present above 0.5V.
Reset logic remains asserted until all four inputs exceed their respective thresholds for ≥200ms; the RST output features an internal ~10µA weak pull-up to V2 and strong pulldown derived from V1/V2/V3, supporting wired-OR configurations and robust low-voltage hold-down during power ramp-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Monitored Voltages | 5V (V1), 3.3V (V2), 2.5V (V3), 1.8V (V4) - fixed thresholds per pin, no external resistor required |
| Threshold Accuracy | ±1.5% over full operating temperature range - ensures predictable reset timing across industrial environments |
| Reset Delay Time | 140–260ms (typ 200ms) - guarantees stable power-up before releasing system reset |
| Supply Current | 20µA typical - enables use in battery-backed or ultra-low-power systems without significant load impact |
| VCC Operating Range | 0.5V minimum guaranteed - supports reset assertion during deep brownout or partial power loss |
| RST Output Type | Active-low open-drain - allows flexible pull-up voltage selection and multi-source reset arbitration |
| Input Voltage Range | V1/V2: –0.3V to 6.5V; V3: 2.7V or (VCC + 0.3V); V4: –0.3V to 6.5V - defines safe signal routing and bypassing requirements |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, JEDEC MO-193 compliant, footprint compatible with standard SOT-23 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 (Pin 1) | Main input supply reference | Monitors 5V rail; supplies internal VCC if ≥ V2; requires 0.1µF bypass capacitor to GND |
| GND (Pin 2) | Ground reference | Common return path for all analog comparators and digital logic; must be low-impedance |
| V2 (Pin 3) | Secondary input supply reference | Monitors 3.3V rail; supplies internal VCC if > V1; requires 0.1µF bypass capacitor to GND |
| V3 (Pin 4) | Tertiary input supply reference | Monitors 2.5V rail; assists RST pulldown below 1V; not adjustable in B1 variant |
| V4 (Pin 5) | Quaternary input supply reference | Monitors 1.8V rail; contributes to low-voltage pulldown strength; not adjustable in B1 variant |
| RST (Pin 6) | Reset logic output | Open-drain active-low output with internal ~10µA pull-up to V2; sinks ≥5µA at VOL ≤ 150mV (VCC = 0.5V) |
Key Features
| Feature | Design Value |
|---|---|
| No hysteresis, high-accuracy thresholding | ±1.5% tolerance over temperature avoids false resets while maintaining tight system voltage margins |
| Ultralow-voltage reset guarantee | Asserts RST down to VCC = 0.5V - critical for detecting early-stage brownouts before logic corruption |
| Glitch-immune comparator architecture | Rejects transients <150µs duration unless overdrive exceeds 1% of threshold - eliminates noise-induced resets |
| Auto-generated internal supply (VCC) | Derives power from greater of V1/V2 - eliminates need for separate bias supply in multirail systems |
| Low quiescent current | 20µA typical draw - reduces standby power in always-on telecom and server management subsystems |
Applications
| Optical Networking Line Cards | Network Server Power Sequencing |
|---|---|
Use Scenario: Monitoring 5V, 3.3V, 2.5V, and 1.8V rails powering FPGA, SerDes, and PHY ICs on dense line cards subject to thermal cycling and EMI. IC Role / Device Role / Timing Role: Quad-rail supervisor ensuring synchronized power-up and brownout detection with 200ms reset hold time. Use Value: Prevents configuration lockup by holding RST until all rails stabilize, leveraging ±1.5% threshold accuracy to avoid over-margining. |
Use Scenario: Coordinating startup of CPU, memory, and I/O subsystems across multiple voltage domains in 1U/2U rack servers. IC Role / Device Role / Timing Role: Centralized reset arbiter with open-drain RST output enabling wired-OR integration with other supervisors or manual reset buttons. Use Value: Guarantees clean boot sequence via 200ms delay and low-voltage pulldown, reducing field failures from marginal power conditions. |
| Cell Phone Base Station RF Modules | Multivoltage Industrial Controllers |
Use Scenario: Supervising isolated DC/DC outputs feeding PA bias, ADC/DAC, and control logic in outdoor macrocell units exposed to wide temperature swings. IC Role / Device Role / Timing Role: Precision voltage monitor with guaranteed operation from –40°C to 85°C and 0.5V VCC support. Use Value: Maintains reset integrity during cold-start and brownout events where VCC drops below 1V, preventing undefined logic states. |
Use Scenario: Ensuring reliable operation of PLC I/O modules powered by mixed 5V, 3.3V, 2.5V, and 1.8V rails in electrically noisy factory environments. IC Role / Device Role / Timing Role: Noise-hardened quad supervisor using transient-duration filtering and 200ms timeout to suppress EFT-induced resets. Use Value: Eliminates spurious reboots caused by switching transients, improving MTBF in mission-critical automation systems. |
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#TRMPBF | 16 user-selectable voltage combinations via pin-strapping; same ±1.5% accuracy and 200ms delay but lacks ultralow 0.5V VCC guarantee | Preferred when flexibility across multiple rail combinations is needed; unsuitable for sub-1V brownout detection | Select LTC2903CS6-B1#TRMPBF when fixed 5V/3.3V/2.5V/1.8V monitoring and guaranteed 0.5V operation are mandatory |
| LTC2902CS6#TRMPBF | Includes RST disable function and adjustable tolerance (5% or 10%); same pinout and thresholds but adds enable control | Used where reset can be temporarily inhibited during firmware updates or diagnostics | Choose LTC2903CS6-B1#TRMPBF for simpler, cost-optimized designs requiring only basic quad monitoring without disable logic |
Compared with LTC2900CS6#TRMPBF and LTC2902CS6#TRMPBF, the LTC2903CS6-B1#TRMPBF offers superior low-voltage robustness (0.5V VCC guarantee) and lower quiescent current (20µA vs 25µA), making it optimal for power-sensitive multivoltage systems where fixed-rail supervision suffices.
Availability
LTC2903CS6-B1#TRMPBF is available at Aetrix Electronics and suitable for optical networking systems, network servers, and cell phone base stations requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to 85°C.
Supply support for LTC2903CS6-B1#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 its precision analog portfolio, including high-reliability power monitoring ICs for telecom, industrial, and computing markets.
The LTC2903CS6-B1#TRMPBF belongs to Linear's LTC290x family of quad voltage supervisors, engineered specifically for multivoltage system integrity in space-constrained, noise-prone environments like optical line cards and server motherboards.
FAQ
What is the guaranteed minimum VCC voltage for reliable operation of the LTC2903CS6-B1#TRMPBF?
The LTC2903CS6-B1#TRMPBF guarantees full functionality-including RST assertion and comparator operation-down to VCC = 0.5V. This is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, where VOL and RST sink current are specified at VCC = 0.5V with IRST = 5µA and VOL ≤ 150mV. The device remains operational even as VCC decays through brownout conditions, ensuring deterministic reset behavior.
Does the LTC2903CS6-B1#TRMPBF require external resistors to set its voltage thresholds?
No. The LTC2903CS6-B1#TRMPBF has factory-trimmed fixed thresholds: 5V (V1), 3.3V (V2), 2.5V (V3), and 1.8V (V4), with ±1.5% accuracy over temperature. Unlike adjustable variants (e.g., LTC2903-D1/E1), it does not use external resistor dividers. Each input connects directly to its corresponding rail, simplifying layout and eliminating resistor tolerance errors in the LTC2903CS6-B1#TRMPBF design.
How does the LTC2903CS6-B1#TRMPBF handle noise on monitored supply lines?
The LTC2903CS6-B1#TRMPBF uses two noise mitigation techniques: first, comparator transient-duration filtering that rejects spikes shorter than ~150µs unless overdrive exceeds 1% of threshold; second, a 200ms reset timeout counter that prevents RST release until all rails remain above threshold for the full period. These features eliminate false resets from EFT, ESD, or switching noise without degrading threshold accuracy via hysteresis.
What is the role of the internal pull-up on the RST pin of the LTC2903CS6-B1#TRMPBF?
The RST pin of the LTC2903CS6-B1#TRMPBF includes an internal ~10µA weak pull-up to V2. This ensures a defined high state when no external pull-up is used, but rise time is slow due to high effective resistance (~50kΩ). For faster edges or pull-up to voltages > V2, an external resistor is recommended. The internal pull-up remains functional even at VCC = 0.5V, supporting basic reset signaling in ultra-low-power modes.
Can the LTC2903CS6-B1#TRMPBF monitor negative voltages?
No. The LTC2903CS6-B1#TRMPBF is not rated for negative input voltages on any pin except V4 in the C1 variant (–5.2V). For LTC2903CS6-B1#TRMPBF, V4 accepts only 0V to 6.5V. Applying negative voltage to V1, V2, V3, or RST violates Absolute Maximum Ratings and may damage the device. Negative rail monitoring requires the LTC2903-C1 variant or discrete solutions.
LTC2903CS6-B1#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:
- 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#TRMPBF FAQ
1.How can I place an order for LTC2903CS6-B1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2903CS6-B1#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 LTC2903CS6-B1#TRMPBF reliable?
The price and inventory of LTC2903CS6-B1#TRMPBF 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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2903CS6-B1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2903CS6-B1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2903CS6-B1#TRMPBF?
LTC2903CS6-B1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2903CS6-B1#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 LTC2903CS6-B1#TRMPBF?
For technical support, including LTC2903CS6-B1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2903CS6-B1#TRMPBF requirements.
6.How does Aetrix verify that LTC2903CS6-B1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2903CS6-B1#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 LTC2903CS6-B1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2903CS6-B1#TRMPBF?
All LTC2903CS6-B1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2903CS6-B1#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 LTC2903CS6-B1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2903CS6-B1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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