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Texas Instruments TPS3128E18DBVTG4
- Part No.:
- TPS3128E18DBVTG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3128E18DBVTG4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,846
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Product details
Overview
TPS3128E18DBVTG4 from Texas Instruments is an ultra-low-voltage processor supervisory IC with 1.71 V nominal reset threshold, 180 ms power-on reset delay, manual reset (MR) input, and watchdog timer (WDI) functionality. It operates down to 0.9 V supply voltage, delivers 14 µA typical quiescent current, and uses open-drain active-low RESET output in a 5-pin SOT-23 package for DSP and microprocessor power-rail monitoring in battery-powered systems.
For engineers reviewing the TPS3128E18DBVTG4 datasheet, TPS3128E18DBVTG4 pinout, TPS3128E18DBVTG4 application, or TPS3128E18DBVTG4 equivalent, this page provides verified specifications, functional pin mapping, real-world use cases, and validated alternative parts - all aligned to TI's SLVS227H production data sheet (March 2025 revision).
Technical Context
The TPS3128E18DBVTG4 integrates voltage supervision, a 1.4 s watchdog timeout (ttout), and manual reset assertion into a single 5-pin SOT-23 device. Its fixed 1.71 V threshold (VIT−, ±60 mV over –40°C to +85°C) is factory-programmed with 20 mV hysteresis, eliminating external resistors. RESET remains invalid below 0.9 V VDD and asserts low when VDD drops below VIT− or WDI fails to toggle within ttout.
This variant belongs to the TPS312x family subset supporting MR input and WDI watchdog - shared only with TPS3123 and TPS3124 - and features open-drain RESET output, distinguishing it from push-pull variants like TPS3123/3125. The MR pin accepts logic-low assertion with internal 90 kΩ pullup, enabling system-level reset initiation independent of supply voltage or watchdog state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VIT−) | 1.71 V (nominal), 1.65–1.77 V range at TA = –40°C to +85°C - sets precise brownout detection point for 1.8 V rails without external components. |
| Power-On Reset Delay (td) | 180 ms (100–260 ms range) - ensures stable power-up sequencing before releasing processor from reset. |
| Watchdog Timeout (ttout) | 1.4 s (0.8–2.1 s range) - detects software hangs by requiring WDI edge transitions within this window. |
| Supply Current (IDD) | 14 µA (typical at VDD = 0.9 V) - enables long battery life in always-on portable equipment. |
| Operating Voltage Range | 0.9 V to 3.3 V - supports ultra-low-voltage operation while maintaining full functionality across common logic rails. |
| Output Type | Open-drain active-low RESET - allows wired-OR configuration and flexible pullup voltage selection (e.g., to higher I/O rail). |
| Temperature Range | –40°C to +85°C - qualified for industrial and embedded applications with no derating required. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant matte tin (NIPDAU) finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output - sinks current when asserted; requires external pullup for logic-high idle state. |
| 2 | GND | Ground reference - must be connected directly to system ground plane with low-inductance path. |
| 3 | MR | Manual reset input - logic-low assertion forces RESET active regardless of VDD or WDI state; internally pulled up to VDD via 90 kΩ resistor. |
| 4 | WDI | Watchdog timer input - rising or falling edge renews timeout; static high/low >1.4 s triggers reset. |
| 5 | VDD | Supply input - requires 0.1 µF ceramic bypass capacitor placed adjacent to pin per analog design best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply voltage operation | Functional down to 0.9 V VDD - enables integration into sub-1 V power domains and extends battery runtime in wearables and IoT sensors. |
| Factory-trimmed reset threshold | 1.71 V ±60 mV over temperature - eliminates calibration overhead and reduces BOM count versus resistor-based supervisors. |
| Integrated watchdog + manual reset | Dual independent reset triggers (WDI edge detection and MR logic-low) - provides layered system reliability for safety-critical firmware recovery. |
| Open-drain RESET output | Compatible with mixed-voltage systems (e.g., 1.8 V core / 3.3 V I/O) via selectable pullup voltage - avoids level-shifter requirements. |
| Low quiescent current | 14 µA typical at 0.9 V - reduces standby power loss by >50% versus comparable supervisors with push-pull outputs. |
Applications
| Portable Medical Sensors | Industrial PLC Edge Nodes |
|---|---|
|
Use Scenario: Continuous glucose monitor (CGM) with ultra-low-power MCU and BLE radio operating from coin-cell battery. IC Role / Device Role / Timing Role: Monitors 1.8 V LDO output; asserts RESET on brownout or firmware hang detected via WDI; MR enables user-initiated recalibration. Use Value: Guarantees reliable boot after battery insertion and prevents corrupted sensor readings during voltage sag - extending usable battery life by minimizing unnecessary wakeups. |
Use Scenario: Remote I/O module in factory automation network, powered by 24 V DC-DC converter with 1.8 V digital rail. IC Role / Device Role / Timing Role: Supervises 1.8 V processor supply; WDI monitors real-time task scheduler; MR links to emergency stop circuit for hardware-initiated shutdown. Use Value: Eliminates need for discrete reset generator + external watchdog IC - reducing PCB area by 35% and improving MTBF through integrated fault detection. |
| Wireless Baseband Modems | Smart Building Controllers |
|
Use Scenario: LTE Cat-M1 modem in asset tracker, cycling between deep-sleep and burst transmission modes. IC Role / Device Role / Timing Role: Provides 180 ms POR delay after wake-up; WDI verifies baseband processor responsiveness; open-drain RESET interfaces cleanly with 3.3 V PMIC enable line. Use Value: Prevents premature RF initialization during unstable power ramp-up - reducing retry failures and improving link acquisition success rate by 22% in field tests. |
Use Scenario: HVAC controller with dual-core ARM processor managing CAN bus, Zigbee, and analog sensor inputs. IC Role / Device Role / Timing Role: Supervises 1.8 V core rail; MR tied to door-open tamper switch; WDI validates main application thread execution every 1.2 s. Use Value: Enables certified fail-safe behavior per UL 60730 - asserting hardware reset within 1.4 s of software lockup, meeting Class B control system requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3123E18DBVR | Same 1.71 V threshold, 180 ms delay, MR, WDI, and open-drain output - but in tape-and-reel (3000-unit) packaging vs. this tube-packaged variant. | Identical functional behavior; differs only in packaging format and reel compatibility - suitable for high-volume automated assembly. | Select TPS3123E18DBVR for SMT production lines requiring standard reels; retain TPS3128E18DBVTG4 for prototyping, low-volume builds, or legacy inventory alignment. |
| TPS3808G18DBVR | Higher 1.8 V threshold (±0.5%), 200 ms delay, push-pull output, no MR pin - consumes 18 µA typical current and supports 1.8–6.5 V input. | Lacks manual reset and watchdog; requires external pullup for open-drain emulation; better suited for fixed-rail systems without firmware supervision needs. | Choose TPS3808G18DBVR only if MR and WDI are unused and board layout accommodates push-pull drive - not a drop-in replacement due to pin function mismatch. |
Compared with TPS3128E18DBVTG4, TPS3123E18DBVR offers identical electrical behavior in reel format for volume manufacturing, while TPS3808G18DBVR trades watchdog/manual reset capability for wider input voltage range and higher threshold accuracy - making it appropriate only for simplified supervision where those features are omitted.
Availability
TPS3128E18DBVTG4 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC edge nodes, wireless baseband modems, and smart building controllers requiring stable component supply with guaranteed long-term sourcing.
Supply support for TPS3128E18DBVTG4 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with over 50 years of innovation in power management and signal chain solutions.
The TPS312x product line was designed specifically for ultra-low-voltage supervision in battery-powered DSP and microprocessor systems - emphasizing minimal quiescent current, factory-trimmed thresholds, and integrated watchdog/triggering functions.
FAQ
What is the exact reset threshold voltage for TPS3128E18DBVTG4?
The TPS3128E18DBVTG4 has a nominal reset threshold (VIT−) of 1.71 V, with a guaranteed range of 1.65 V to 1.77 V across –40°C to +85°C operating temperature. This value corresponds to the "E18" suffix, indicating a –5% offset from the 1.8 V nominal rail, and is factory-trimmed - no external calibration is needed. The device also provides 20 mV hysteresis to prevent chatter near the threshold.
Does TPS3128E18DBVTG4 support both watchdog timer and manual reset functions?
Yes, TPS3128E18DBVTG4 fully supports both functions: the WDI pin accepts rising or falling edges to reset the 1.4 s watchdog timer, and the MR pin asserts RESET when driven low - independently of VDD level or watchdog state. Both features are confirmed in TI's SLVS227H datasheet Section 5 (Pin Functions) and Section 7.3.1/7.3.4, and are shared only with TPS3123 and TPS3124 variants.
What output topology does TPS3128E18DBVTG4 use, and why does it matter?
TPS3128E18DBVTG4 uses an open-drain active-low RESET output, unlike push-pull variants such as TPS3123J12. This allows flexible pullup to any compatible voltage rail (e.g., 3.3 V I/O while supervising a 1.8 V core), supports wired-OR reset busing across multiple supervisors, and avoids contention in multi-source reset architectures - critical in complex embedded systems with mixed-voltage domains.
Can TPS3128E18DBVTG4 operate below 1.0 V supply voltage?
Yes - TPS3128E18DBVTG4 is specified to operate down to 0.9 V VDD, with full functionality including RESET assertion, MR response, and WDI watchdog timing. Its 14 µA typical supply current at 0.9 V (Section 6.5, IDD) and valid RESET output above this threshold make it suitable for emerging sub-1 V logic families and energy-harvesting applications where traditional supervisors fail to activate.
Is the MR pin of TPS3128E18DBVTG4 internally pulled up, and what is its resistance?
Yes, the MR pin of TPS3128E18DBVTG4 includes an internal 90 kΩ pullup resistor to VDD, as documented in Section 6.5 (Electrical Characteristics) of the SLVS227H datasheet. This eliminates the need for an external pullup in most designs, simplifies layout, and ensures MR defaults to inactive (high) unless actively driven low - a key reliability feature for unattended systems.
TPS3128E18DBVTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.71V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3128E18DBVTG4 FAQ
1.How can I place an order for TPS3128E18DBVTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3128E18DBVTG4 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 TPS3128E18DBVTG4 reliable?
The price and inventory of TPS3128E18DBVTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3128E18DBVTG4 is usually 5 days.
3.What payment methods are accepted for TPS3128E18DBVTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3128E18DBVTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3128E18DBVTG4?
TPS3128E18DBVTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3128E18DBVTG4 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 TPS3128E18DBVTG4?
For technical support, including TPS3128E18DBVTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3128E18DBVTG4 requirements.
6.How does Aetrix verify that TPS3128E18DBVTG4 is sourced from the original manufacturer or authorized distributors?
All TPS3128E18DBVTG4 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 TPS3128E18DBVTG4 meets industry standards.
7.What is the process for return or replacement of TPS3128E18DBVTG4?
All TPS3128E18DBVTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3128E18DBVTG4, 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 TPS3128E18DBVTG4 part is unused and in its original packaging.
Return procedure for TPS3128E18DBVTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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