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Analog Devices Inc. LTC2903IS6-B1#TRMPBF
- Part No.:
- LTC2903IS6-B1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC2903IS6-B1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,405
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Product details
Overview
LTC2903IS6-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 deployed in multivoltage systems such as network servers and optical networking equipment where reliable power sequencing and brownout detection are critical.
For engineers reviewing the LTC2903IS6-B1#TRMPBF datasheet, LTC2903IS6-B1#TRMPBF pinout, LTC2903IS6-B1#TRMPBF application, or LTC2903IS6-B1#TRMPBF equivalent, this page provides verified technical context, exact pin functions, real-world use scenarios, and validated alternative parts for system-level power integrity design.
Technical Context
The LTC2903IS6-B1#TRMPBF integrates four independent voltage comparators referenced to an internal bandgap, each monitoring a fixed threshold: 4.425V (5V, 10%), 2.921V (3.3V, 10%), 2.213V (2.5V, 10%), and 1.593V (1.8V, 10%). Its internal VCC is autonomously generated from the higher of V1 or V2 inputs, enabling operation without external bias.
It features glitch-immune comparator architecture with transient filtering (≥150µs duration required for 1% overdrive), a 200ms reset timeout counter that resets on any undervoltage event, and low-voltage pull-down circuitry sustaining RST low down to 0.2V input supply-critical for robust reset hold during deep brownouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Monitored Voltages | 5V, 3.3V, 2.5V, 1.8V - fixed thresholds per variant B1; no external resistors needed |
| Threshold Accuracy | ±1.5% over full operating temperature range - ensures deterministic reset timing across industrial environments |
| Reset Delay | 200ms nominal - guarantees stable power-up before releasing system reset |
| Supply Current | 20µA typical - enables integration into ultra-low-power systems without compromising supervision fidelity |
| Minimum VCC | 0.5V guaranteed - maintains RST assertion even during severe undervoltage conditions |
| RST Output Type | Active-low open-drain with weak internal pull-up to V2 - supports wired-OR reset buses and flexible voltage-level interfacing |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded and telecom applications |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, JEDEC MO-193 compliant. Dimensions: 2.90 mm × 1.60 mm × 0.80–0.90 mm height.
| 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) | Reference ground | Common return for all comparators and RST pull-down path |
| 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 during undervoltage |
| RST (Pin 6) | Reset logic output | Open-drain output pulled low when any input falls below threshold; internal ~10µA pull-up to V2 |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow-voltage reset hold | RST remains asserted down to VCC = 0.5V - prevents spurious release during marginal supply recovery |
| No hysteresis design | Maintains ±1.5% threshold accuracy without degrading spec via intentional hysteresis - preserves true supply margin analysis |
| Glitch-immune comparators | Requires ≥150µs transient overdrive at 1% of threshold - rejects EMI-induced false triggers in noisy server backplanes |
| Autonomous VCC generation | VCC derived from greater of V1/V2 - eliminates need for dedicated bias supply in multi-rail systems |
| Low-profile SOT-23 packaging | 1mm height TSOT-23 - enables dense placement near VRMs and processors in space-constrained telecom modules |
Applications
| Network Server Power Sequencing | Optical Line Card Supervision |
|---|---|
|
Use Scenario: Simultaneous monitoring of 5V, 3.3V, 2.5V, and 1.8V rails powering FPGAs, SERDES, and PHYs on high-density line cards. IC Role / Device Role / Timing Role: Quad-supply supervisor asserting single RST signal only after all rails stabilize for 200ms post-power-up. Use Value: Prevents configuration lockup by ensuring FPGA config memory receives valid VCCIO before JTAG or PCIe initialization begins. |
Use Scenario: Monitoring DC/DC outputs feeding laser diode drivers and transimpedance amplifiers in CFP2/OSFP modules. IC Role / Device Role / Timing Role: Detecting sub-100mV droop on 3.3V analog bias rail while maintaining 200ms reset hold to avoid laser modulation glitches. Use Value: Eliminates optical burst errors caused by premature DAC enablement during 2.5V digital core ramp-up. |
| Cell Phone Base Station RF Front-End | Multivoltage Industrial PLC Controller |
|
Use Scenario: Supervising 5V PA bias, 3.3V control logic, 2.5V ADC reference, and 1.8V DSP core in remote radio units. IC Role / Device Role / Timing Role: Generating unified reset pulse only when all rails exceed ±1.5% thresholds - no partial-release behavior. Use Value: Guarantees synchronized startup of RF calibration routines across multiple ASICs sharing one reset domain. |
Use Scenario: Monitoring isolated 5V I/O, 3.3V microcontroller, 2.5V sensor interface, and 1.8V FPGA configuration in harsh factory environments. IC Role / Device Role / Timing Role: Holding RST low during AC line sags below 85% nominal - leveraging 0.5V VCC guarantee for extended brownout immunity. Use Value: Avoids watchdog timeouts and firmware corruption during 20–50ms grid disturbances common in motor-drive zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2900CS6-5 | 16 selectable threshold combinations via pin-strapping; same ±1.5% accuracy and 200ms delay; requires external configuration resistors | Supports non-standard rails (e.g., 1.2V, 3.0V) but lacks fixed B1 mapping; higher BOM count | Select when custom voltage combinations beyond 5V/3.3V/2.5V/1.8V are required; not drop-in for B1 footprint |
| LTC2902IS6-5 | Includes RST disable function and adjustable tolerance (5%/10%); identical pinout and B1 threshold set; 25µA typical IQ | Enables dynamic reset inhibition during firmware updates; slightly higher quiescent current | Choose when system-level software-controlled reset suspension is mandatory; otherwise, LTC2903IS6-B1#TRMPBF offers lower IQ and simpler implementation |
Compared with LTC2900CS6-5 and LTC2902IS6-5, the LTC2903IS6-B1#TRMPBF delivers optimized fixed-threshold supervision with lowest quiescent current and zero configuration overhead - ideal for cost-sensitive, high-volume multivoltage systems where 5V/3.3V/2.5V/1.8V coverage is standard.
Availability
LTC2903IS6-B1#TRMPBF is available at Aetrix Electronics and suitable for network servers, optical networking systems, cell phone base stations, and industrial PLC controllers requiring stable component supply with guaranteed long-term availability.
Supply support for LTC2903IS6-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 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 telecom and computing infrastructure - emphasizing threshold stability, ultralow-VCC operation, and noise-immune reset generation.
FAQ
What is the exact threshold voltage for each monitored rail in LTC2903IS6-B1#TRMPBF?
The LTC2903IS6-B1#TRMPBF monitors four fixed rails: V1 = 5V (4.425V typical threshold), V2 = 3.3V (2.921V), V3 = 2.5V (2.213V), and V4 = 1.8V (1.593V), all with ±1.5% accuracy over –40°C to +85°C. These values are guaranteed in the Electrical Characteristics table under "LTC2903-B1" conditions with VCC = 5V.
Does LTC2903IS6-B1#TRMPBF require external pull-up resistors on the RST pin?
The LTC2903IS6-B1#TRMPBF includes an internal ~10µA pull-up to V2 on the RST pin, sufficient for basic level translation. However, an external pull-up resistor is recommended when interfacing to logic families requiring VOH > V2 or faster rise times - especially in systems with >50pF net capacitance or multi-drop reset buses.
Can LTC2903IS6-B1#TRMPBF operate with only three voltage rails connected?
Yes. Unused inputs (e.g., V4) should be tied to the highest available supply voltage (e.g., V1 or V2) to ensure they remain above threshold and do not trigger false reset. The LTC2903IS6-B1#TRMPBF will assert RST only when *all* four inputs fall below their respective thresholds - so holding unused pins high preserves correct functionality.
What is the minimum supply voltage required to guarantee RST assertion in LTC2903IS6-B1#TRMPBF?
The LTC2903IS6-B1#TRMPBF guarantees RST remains low with VCC as low as 0.5V - confirmed in Absolute Maximum Ratings and Low Voltage Reset Pull-Down Performance graphs. This is achieved via dedicated low-voltage pull-down circuitry sourcing current from V1, V2, and V3 simultaneously.
How does LTC2903IS6-B1#TRMPBF handle noise on monitored supply lines?
The LTC2903IS6-B1#TRMPBF employs dual-stage noise immunity: (1) comparator transient filtering requiring ≥150µs duration for 1% overdrive, and (2) a 200ms reset timeout that clears on any subsequent undervoltage - effectively rejecting noise bursts shorter than 5Hz. Bypass capacitors (0.1µF) on V1 and V2 are mandatory for stable VCC generation.
LTC2903IS6-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC2903IS6-B1#TRMPBF FAQ
1.How can I place an order for LTC2903IS6-B1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2903IS6-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 LTC2903IS6-B1#TRMPBF reliable?
The price and inventory of LTC2903IS6-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 LTC2903IS6-B1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2903IS6-B1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2903IS6-B1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2903IS6-B1#TRMPBF?
LTC2903IS6-B1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2903IS6-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 LTC2903IS6-B1#TRMPBF?
For technical support, including LTC2903IS6-B1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2903IS6-B1#TRMPBF requirements.
6.How does Aetrix verify that LTC2903IS6-B1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2903IS6-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 LTC2903IS6-B1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2903IS6-B1#TRMPBF?
All LTC2903IS6-B1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2903IS6-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 LTC2903IS6-B1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2903IS6-B1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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