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Analog Devices Inc. LTC2917HMS-A1#PBF
- Part No.:
- LTC2917HMS-A1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2917HMS-A1#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,023
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Product details
Overview
LTC2917HMS-A1#PBF from Analog Devices (formerly Linear Technology) is a high-temperature voltage supervisor IC with 9 selectable nominal thresholds (12V to ADJ), ±1.5% threshold accuracy over –40°C to 125°C, adjustable reset and watchdog timers, and glitch-immune open-drain RST output - designed for automotive control systems requiring reliable power-up/power-down sequencing and system-level fault detection.
For engineers reviewing the LTC2917HMS-A1#PBF datasheet, LTC2917HMS-A1#PBF pinout, LTC2917HMS-A1#PBF application, or LTC2917HMS-A1#PBF equivalent, this page delivers verified technical context, exact pin functions, real-world timing values (e.g., 200ms internal reset timeout, 1.6s internal watchdog upper bound), thermal-grade package validation (MSOP-10, –40°C to 125°C), and two confirmed alternative parts with documented functional differences.
Technical Context
The LTC2917HMS-A1#PBF implements a dual-stage supervision architecture: a precision comparator monitors VM against one of nine internally trimmed thresholds selected via SEL1/SEL2, while TOL configures tolerance (–5%/–10%/–15%). Its reset logic includes guaranteed RST assertion down to VCC ≥ 0.8V and glitch immunity with tUV ≤ 150μs.
This A1 variant uses fixed internal timers - 200ms reset timeout (RT = VCC) and 1.6s watchdog upper boundary (WT = VCC) - without external capacitors. It lacks manual reset (MR) and windowed watchdog (B1 feature), distinguishing it from LTC2918 and B1 versions. Operation up to 125°C and ±1.5% threshold accuracy across temperature confirm its suitability for under-hood automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V operating; 6.2V shunt regulator enables operation from higher supplies (e.g., 12V automotive battery) with series resistor |
| Threshold Accuracy | ±1.5% over full –40°C to 125°C range - ensures no nuisance resets within supply tolerance bands (e.g., 5V ±10% monitored at 4.425V ±75mV) |
| Reset Timeout | 200ms internal (RT tied to VCC) - provides stable deassertion delay after VM recovery, eliminating false releases during supply transients |
| Watchdog Upper Bound | 1.6s internal (WT tied to VCC) - defines maximum allowed WDI toggle period before RST assertion in standard watchdog mode (A1 version) |
| Quiescent Current | 30μA typical - enables long-term battery-backed monitoring in always-on automotive subsystems without significant drain |
| VM Input Impedance | 0.5–8MΩ depending on SEL configuration - supports direct connection to low-leakage voltage rails or high-impedance resistive dividers for ADJ mode |
| Operating Temperature | –40°C to +125°C (H-grade) - qualified for engine control units, transmission modules, and other under-hood applications |
Pinout & Package
Package: 10-Lead MSOP (3mm × 3mm), exposed pad optional, rated for TJMAX = 125°C, θJA = 200°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal circuits and RST pull-down; must be low-impedance connection |
| TOL | Tolerance select input (three-state) | Configures VM threshold tolerance: VCC = –5%, open = –10%, GND = –15%; determines trip point hysteresis band |
| SEL2 | Nominal voltage select input (three-state) | Together with SEL1, selects one of nine thresholds (e.g., SEL2=GND, SEL1=VCC → 3.3V nominal) |
| SEL1 | Nominal voltage select input (three-state) | Three-state control (VCC/GND/open) defining 9 preset thresholds including ADJ (0.5V); no external resistors required |
| VM | Voltage monitor input | High-impedance comparator input; monitors external supply or resistive divider; triggers RST when below programmed threshold |
| RST | Open-drain reset output | Asserts low during undervoltage or watchdog timeout; requires external pull-up; supports wired-OR with other supervisors |
| RT | Reset timeout control | Tie to VCC for 200ms internal timeout; leave open for ~400μs; connect capacitor to GND for adjustable timeout (9ms/nF) |
| WT | Watchdog timer control | Tie to VCC for 1.6s internal watchdog upper bound; open for ~3.2ms; GND disables watchdog; no lower-bound window (A1 only) |
| WDI | Watchdog input | Falling-edge sensitive (A1); must toggle within 1.6s to prevent RST assertion; no response to rising edges |
| VCC | Power supply input | Accepts 1.5–5.5V directly; includes 6.2V shunt regulator for >5.7V operation (requires current-limiting resistor) |
Key Features
| Feature | Design Value |
|---|---|
| 27 selectable combinations | 9 nominal voltages × 3 tolerances (–5%/–10%/–15%) - eliminates need for external resistor networks in production designs |
| Glitch-immune supervision | tUV ≤ 150μs minimum pulse width required to trigger RST - prevents false resets from load transients or EMI near threshold |
| Guaranteed operation at low VCC | RST asserted for VCC ≥ 0.8V - ensures valid reset generation even during brown-out conditions before core logic powers up |
| Internal shunt regulator | 6.2V regulation on VCC pin - enables direct 12V automotive battery interface with single series resistor (no LDO needed) |
| High-temperature qualification | Tested and specified over –40°C to +125°C - meets AEC-Q100 stress requirements for engine compartment deployment |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Sequencing |
|---|---|
|
Use Scenario: Monitoring 5V microcontroller supply in an under-hood ECU subject to wide temperature swings and battery voltage transients. IC Role / Device Role / Timing Role: Voltage supervisor asserting RST during cold cranking dips (<4.5V) and holding reset for 200ms after recovery to ensure clean MCU boot. Use Value: ±1.5% threshold accuracy prevents spurious resets during normal 5V±10% operation; 125°C rating ensures reliability at peak under-hood temperatures. |
Use Scenario: Coordinating power-up sequence of FPGA, ADC, and communication ICs in a modular industrial controller. IC Role / Device Role / Timing Role: Generating synchronized reset pulses with precise 200ms timeout to guarantee all subsystems initialize before firmware execution begins. Use Value: Internal timer eliminates capacitor placement and tolerance errors; open-drain RST allows wired-OR with other supervisors for multi-rail coordination. |
| Telecom Base Station Power Management | Medical Diagnostic Imaging Subsystem |
|
Use Scenario: Supervising 3.3V I/O supply in a remote radio head exposed to outdoor temperature extremes and lightning-induced surges. IC Role / Device Role / Timing Role: Detecting undervoltage events on 3.3V rail and triggering watchdog reset if baseband processor fails to toggle WDI within 1.6s. Use Value: 1.6s watchdog upper bound aligns with firmware heartbeat intervals; glitch filtering rejects surge-induced noise on VM line. |
Use Scenario: Ensuring safe power-down of X-ray detector ASICs when main 1.8V analog supply drops below specification during emergency shutdown. IC Role / Device Role / Timing Role: Monitoring 1.8V supply with –10% tolerance (TOL=open) and asserting RST within 10μs of threshold breach to halt data acquisition immediately. Use Value: tUV ≤ 150μs guarantees sub-100μs response to fast transients; guaranteed RST operation at VCC = 0.8V ensures reset integrity during rapid brown-out. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2917HMS-B1#PBF | Includes windowed watchdog (tWDL = 50ms) and same H-grade temp range; identical pinout and threshold selection | Required where system safety mandates detection of both too-slow and too-fast WDI toggling (e.g., ISO 26262 ASIL-B) | Select B1 for high-reliability automotive or industrial systems needing dual-boundary watchdog enforcement |
| TPS3808G33DBVR | Fixed 3.3V threshold, no selectable voltages; 1.8–6.0V supply; 35μA IQ; 200ms fixed reset timeout; SOT-23-6 | Suitable only for single-rail 3.3V monitoring; lacks multi-threshold flexibility and ADJ mode | Choose TPS3808G33DBVR for cost-sensitive, space-constrained 3.3V-only applications where programmability is unnecessary |
Compared with LTC2917HMS-A1#PBF, the B1 variant adds critical windowed watchdog capability for functional safety compliance, while the TPS3808G33DBVR trades configurability for smaller footprint and lower unit cost in fixed-threshold deployments.
Availability
LTC2917HMS-A1#PBF is available at Aetrix Electronics and suitable for automotive control systems, industrial PLCs, telecom base stations, and medical imaging subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2917HMS-A1#PBF 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, manufacturing, and qualification for the LTC portfolio. Linear's legacy expertise in precision analog and power management remains foundational to these devices.
The LTC2917 family was designed specifically for high-reliability power supervision in harsh environments - emphasizing threshold accuracy, glitch immunity, wide temperature operation, and minimal external components for automotive, industrial, and telecom applications.
FAQ
What is the guaranteed operating temperature range for the LTC2917HMS-A1#PBF?
The LTC2917HMS-A1#PBF is rated for –40°C to +125°C (H-grade), with full electrical specifications guaranteed across this range. This includes ±1.5% threshold accuracy, 30μA quiescent current, and functional reset/watchdog behavior - making it suitable for under-hood automotive and industrial edge applications where ambient temperatures exceed 105°C.
Does the LTC2917HMS-A1#PBF support manual reset functionality?
No, the LTC2917HMS-A1#PBF does not include a manual reset (MR) input. That function is exclusive to the LTC2918 variants. The LTC2917HMS-A1#PBF relies solely on VM monitoring, watchdog timeout, and power-on reset for reset generation. If push-button reset is required, the LTC2918HMS-A1#PBF is the direct functional counterpart.
How is the watchdog timer configured on the LTC2917HMS-A1#PBF?
The LTC2917HMS-A1#PBF uses the A1 configuration, which implements a standard (non-windowed) watchdog. The upper timeout boundary is fixed at 1.6s when WT is tied to VCC. WDI responds only to falling edges, and failure to toggle within 1.6s asserts RST for the programmed reset timeout (200ms when RT = VCC). No lower boundary enforcement is present - that requires the B1 version.
Can the LTC2917HMS-A1#PBF monitor a 12V supply directly?
Yes, the LTC2917HMS-A1#PBF can monitor a 12V supply using its internal 6.2V shunt regulator on the VCC pin. A series current-limiting resistor (e.g., 11kΩ for 12V) is required between the 12V source and VCC to keep input current ≤5mA. VM is then connected to the 12V rail (SEL1=VCC, SEL2=VCC selects 12V nominal threshold), enabling full supervision without external regulators.
What is the reset timeout behavior during power-up for the LTC2917HMS-A1#PBF?
During power-up, the LTC2917HMS-A1#PBF asserts RST low as soon as VCC reaches 0.8V and holds it until VCC exceeds 1.5V (UVLO threshold). Once VCC is stable above 1.5V and VM is above the selected threshold, the internal 200ms reset timer starts. RST releases only after this full timeout completes - ensuring the MCU or FPGA receives a clean, extended reset pulse before initialization begins.
LTC2917HMS-A1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 27 Selectable Threshold Combinations
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC2917HMS-A1#PBF FAQ
1.How can I place an order for LTC2917HMS-A1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2917HMS-A1#PBF 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 LTC2917HMS-A1#PBF reliable?
The price and inventory of LTC2917HMS-A1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2917HMS-A1#PBF is usually 5 days.
3.What payment methods are accepted for LTC2917HMS-A1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2917HMS-A1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2917HMS-A1#PBF?
LTC2917HMS-A1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2917HMS-A1#PBF 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 LTC2917HMS-A1#PBF?
For technical support, including LTC2917HMS-A1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2917HMS-A1#PBF requirements.
6.How does Aetrix verify that LTC2917HMS-A1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2917HMS-A1#PBF 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 LTC2917HMS-A1#PBF meets industry standards.
7.What is the process for return or replacement of LTC2917HMS-A1#PBF?
All LTC2917HMS-A1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2917HMS-A1#PBF, 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 LTC2917HMS-A1#PBF part is unused and in its original packaging.
Return procedure for LTC2917HMS-A1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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