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Silicon Labs TSM917EUK+
- Part No.:
- TSM917EUK+
- Manufacturer:
- Silicon Labs
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TSM917EUK+.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,099
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Product details
Overview
TSM917EUK+ from Silicon Laboratories is a nanopower analog comparator with integrated 1.245V ±1.5% reference, designed for ultra-low-power battery monitoring and threshold detection. It operates down to +1.8V, draws only 750nA supply current, features rail-to-rail push-pull output, and supports input voltages extending 200mV beyond supply rails - enabling direct sensing at ground or supply lines in 2-cell battery systems.
For engineers reviewing the TSM917EUK+ datasheet, TSM917EUK+ pinout, TSM917EUK+ application, or TSM917EUK+ equivalent, key selection criteria include guaranteed 1.8V operation, internal hysteresis (4mV), input offset voltage (≤10mV over temperature), reference temperature coefficient (95ppm/°C), and SOT23-5 package compatibility with MAX917.
Technical Context
The TSM917EUK+ implements a robust CMOS input stage tolerant of inputs from VEE − 0.2V to VCC + 0.2V, with typical input bias current of 0.15nA. Its internal 1.245V reference has 200kΩ output impedance and exhibits 600µVRMS noise (10Hz–100kHz) without external bypass.
The comparator uses fixed internal hysteresis (4mV) to prevent oscillation near trip points and employs a rail-to-rail push-pull output stage capable of sourcing/sinking ±8mA while minimizing supply-current surges during switching - critical for stable operation in high-impedance, low-noise battery-powered signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - enables direct operation from single Li-ion or dual alkaline cells without regulation. |
| Supply Current | 750nA at 1.8V - extends battery life in always-on monitoring circuits beyond 2.5 million hours per AA cell. |
| Reference Voltage | 1.245V ±1.5% (±18.7mV) - provides stable, factory-trimmed threshold for precision low-voltage detection. |
| Input Offset Voltage | ≤10mV over −40°C to +85°C - ensures reliable trip-point accuracy across industrial temperature range. |
| Propagation Delay | 17µs (high-to-low) at 1.8V - supports fast response in wake-up or fault-detection circuits with minimal latency. |
| Output Drive | ±8mA rail-to-rail push-pull - eliminates need for external pull-up resistors and simplifies interface to microcontroller GPIO or logic inputs. |
| Hysteresis | 4mV internal - suppresses noise-induced chatter without external feedback components. |
Pinout & Package
Package: 5-pin SOT23 (SC70), 1.6mm × 1.6mm footprint, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Comparator Output | Push-pull digital output driving high/low to VCC/VEE rails - compatible with 1.8V–5.5V logic interfaces. |
| 2 (VEE) | Negative Supply Voltage | Ground reference pin; supports single-supply operation when tied to system GND. |
| 3 (IN+) | Noninverting Input | High-impedance (±0.15nA bias) input accepting signals up to VEE − 0.2V or VCC + 0.2V - enables over-rail sensing. |
| 4 (REF) | Reference Output / Inverting Input | Provides 1.245V reference and serves as comparator inverting input - allows self-referenced threshold detection. |
| 5 (VCC) | Positive Supply Voltage | Accepts 1.8V–5.5V supply; powers both comparator core and reference - no separate reference supply required. |
Key Features
| Feature | Design Value |
|---|---|
| Second-source for MAX917 | Electrically and form-factor identical - enables drop-in replacement in legacy designs without layout or firmware changes. |
| Rail-to-rail input voltage range | Extends 200mV beyond supply rails - permits direct monitoring of battery voltage or sensor outputs referenced to ground or VCC. |
| No phase reversal | Guaranteed correct output polarity even when inputs exceed supply rails - prevents false triggering in overvoltage conditions. |
| Crowbar-current-free switching | Eliminates shoot-through current during output transitions - reduces supply ripple and avoids need for large bypass capacitors. |
| Internal 1.245V reference | ±1.5% initial accuracy and 95ppm/°C drift - replaces external reference ICs and saves BOM cost and PCB area in compact battery systems. |
Applications
| Battery Voltage Monitoring | Medical Sensor Threshold Detection |
|---|---|
Use Scenario: Continuous monitoring of 2-cell alkaline or NiMH battery voltage to trigger low-battery alerts before system shutdown. IC Role / Device Role / Timing Role: Analog comparator comparing battery voltage against internal 1.245V reference scaled via resistor divider - acts as autonomous voltage supervisor. Use Value: 750nA quiescent current extends operational lifetime to >2.5 million hours per AA cell, eliminating need for periodic battery replacement in remote telemetry units. | Use Scenario: Detecting physiological signal thresholds (e.g., ECG R-wave amplitude, pulse oximeter saturation drop) in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail comparator converting analog sensor outputs into clean digital triggers for microcontroller wake-up or alarm generation. Use Value: 4mV internal hysteresis and <10mV offset ensure stable edge detection despite sensor baseline drift and EMI - reducing false alarms in clinical environments. |
| Ultra-Low-Power Telemetry Node | Ground-Referenced Sensing Interface |
Use Scenario: Wake-up circuit in solar- or battery-powered environmental sensors that transmit data only upon crossing temperature/humidity thresholds. IC Role / Device Role / Timing Role: Always-on comparator monitoring conditioned sensor output against fixed reference - initiates MCU power-up sequence via interrupt-capable output. Use Value: 1.8V minimum operating voltage and 17µs propagation delay enable rapid response to events while consuming <1µA - preserving energy budget for RF transmission. | Use Scenario: Monitoring current-sense amplifier outputs or shunt voltage drops referenced directly to system ground in power management ICs. IC Role / Device Role / Timing Role: Comparator with IN+ tied to ground-referenced signal and REF used as precise threshold - eliminates level-shifting circuitry. Use Value: Input stage tolerance to VEE − 0.2V allows direct connection to ground-sensed signals without clamping diodes or op-amp buffers - reducing component count and error sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX917ESA+ | Pin-compatible, identical electrical specs; same 5-pin SOIC package variant but different marking and packaging (tube vs tape/reel). | Same use cases - 2-cell battery monitoring, medical instruments - but requires verification of SOIC-8 footprint compatibility. | Select MAX917ESA+ only if SOIC-8 layout exists; TSM917EUK+ is preferred for space-constrained SOT23-5 designs. |
| TLV3691IDBVR | Lower supply current (320nA), but no integrated reference; requires external 1.24V reference or resistor divider; 1.8V min supply same. | Suitable for ultra-low-power apps where reference flexibility is needed, but adds BOM cost and layout complexity. | Choose TLV3691IDBVR only when reference voltage must be programmable or externally trimmed; TSM917EUK+ simplifies design with monolithic reference. |
Compared with MAX917ESA+, TSM917EUK+ offers identical functionality in smaller SOT23-5 packaging and tape-and-reel delivery; compared with TLV3691IDBVR, it trades slightly higher supply current for integrated reference and reduced external component count - optimizing for size, cost, and time-to-market in battery-critical systems.
Availability
TSM917EUK+ is available at Aetrix Electronics and suitable for 2-cell battery monitoring, medical instrument threshold detection, and ultra-low-power telemetry requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.
Supply support for TSM917EUK+ 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
Silicon Laboratories is a U.S.-based semiconductor company specializing in energy-efficient, mixed-signal ICs for timing, MCU, wireless, and sensor applications.
The TSM917EUK+ belongs to Silicon Labs' nanopower analog comparator product line, engineered specifically for battery-operated systems demanding sub-1µA quiescent current, rail-to-rail operation, and integrated precision references.
FAQ
What is the minimum operating voltage for the TSM917EUK+?
The TSM917EUK+ guarantees operation down to +1.8V supply voltage, making it suitable for direct interfacing with two alkaline, NiMH, or lithium primary cells across their full discharge curve. This specification is fully tested and guaranteed over the −40°C to +85°C temperature range, and the device maintains 750nA supply current even at this minimum voltage - critical for maximizing battery service life in always-on monitoring applications.
Does the TSM917EUK+ require external hysteresis components?
No, the TSM917EUK+ includes 4mV of internal hysteresis to prevent oscillation near trip points, eliminating the need for external positive-feedback resistors in most threshold-detection applications. This built-in hysteresis is factory-trimmed and stable over temperature. External hysteresis can be added using three resistors if wider bands (e.g., 100mV) are required, but doing so increases component count and slows response time - the internal hysteresis is sufficient for typical battery-monitoring and sensor-discrimination use cases of the TSM917EUK+.
Can the TSM917EUK+ inputs safely exceed the supply rails?
Yes, the TSM917EUK+ input stage tolerates voltages from VEE − 0.2V to VCC + 0.2V, enabling direct sensing of signals referenced to ground or supply rails without external clamping. This over-rail capability is achieved via robust ESD protection diodes and is specified in the Absolute Maximum Ratings table. No phase reversal occurs under these conditions, ensuring reliable output behavior - a key advantage of the TSM917EUK+ in battery voltage monitoring and ground-referenced current sensing applications.
What is the accuracy and stability of the internal reference in the TSM917EUK+?
The TSM917EUK+ integrates a 1.245V reference with ±1.5% initial accuracy (±18.7mV) over temperature, 95ppm/°C temperature coefficient, and 600µVRMS noise (10Hz–100kHz). Its 200kΩ output impedance allows stable operation with any capacitive load, and it remains accurate across the full 1.8V–5.5V supply range. These characteristics make the internal reference suitable for precision threshold detection without calibration - a defining feature of the TSM917EUK+ in medical and telemetry applications.
Is the TSM917EUK+ pin-compatible with the MAX917?
Yes, the TSM917EUK+ is electrically and form-factor identical to the MAX917, including matching pinout, electrical specifications, and SOT23-5 package dimensions. It is explicitly marketed as a second-source replacement, enabling drop-in substitution in existing MAX917 designs without layout modification, firmware update, or requalification. The TSM917EUK+ maintains identical propagation delay, supply current, reference accuracy, and input voltage range - ensuring full functional equivalence for the TSM917EUK+ in legacy and new designs alike.
TSM917EUK+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Package/Case:
- SC-74A, SOT-753
- Series:
- TSM91x
- Packaging:
- Strip
- Product Status:
- Obsolete
- Type:
- with Voltage Reference
- Number of Elements:
- 1
- Output Type:
- Push-Pull
- Voltage - Supply, Single/Dual (±):
- 1.8V ~ 5.5V
- :
- 5mV
- Voltage - Input Offset (Max):
- 0.001µA
- Current - Input Bias (Max):
- 50mA
- Current - Output (Typ):
- 680nA
- Current - Quiescent (Max):
- 80dB PSRR
- CMRR, PSRR (Typ):
- 95µs
- Propagation Delay (Max):
- 4mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-5
TSM917EUK+ FAQ
1.How can I place an order for TSM917EUK+ through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM917EUK+ 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 TSM917EUK+ reliable?
The price and inventory of TSM917EUK+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM917EUK+ is usually 5 days.
3.What payment methods are accepted for TSM917EUK+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM917EUK+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM917EUK+?
TSM917EUK+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM917EUK+ 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 TSM917EUK+?
For technical support, including TSM917EUK+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM917EUK+ requirements.
6.How does Aetrix verify that TSM917EUK+ is sourced from the original manufacturer or authorized distributors?
All TSM917EUK+ 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 TSM917EUK+ meets industry standards.
7.What is the process for return or replacement of TSM917EUK+?
All TSM917EUK+ units undergo pre-shipment inspection (PSI). If there is an issue with TSM917EUK+, 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 TSM917EUK+ part is unused and in its original packaging.
Return procedure for TSM917EUK+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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