TPS1689 - 9V-80V, 20A Stackable eFuse with PMBus | TI
MPN: TPS1689 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.2 | $620.00 |
| 500 | $5.4 | $2,700.00 |
| 1,000 | $4.8 | $4,800.00 |
Drop-in alternatives for TPS1689 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS1689x-Q1
✅ Drop-In✓ In Stock
$3.36 / Unit
View Datasheet →TPS1685
⚡ Same Package📋 Reference alternative (not in catalog)
TPS1689 Maximum Ratings & Electrical Characteristics
| Function | Integrated hot-swap eFuse with PMBus digital telemetry |
| Input Operating Voltage Range | 9 V to 80 V |
| Absolute Maximum Input Voltage | 92 V |
| Negative Output Transient Withstand | -5 V |
| Integrated FET ON-Resistance | 3.5 mOhm (typ) |
| Maximum Continuous Current | 20 A |
| Stackable Operation | Yes (parallel eFuses for higher current) |
| Digital Interface | PMBus (telemetry, control, configuration) |
| Current Monitoring | IMON pin, shareable across parallel TPS1689x/TPS1685x devices |
| Protection Modes | Overload, short circuit, inrush, overvoltage, undervoltage, thermal shutdown |
| Package | [DATA_NEEDED: package type] |
| Mounting Type | Surface Mount |
| RoHS Status | [DATA_NEEDED: RoHS status] |
| Evaluation Module | TPS1689EVM |
| Manufacturer | Texas Instruments |
TPS1689 [data_needed: package type] Pin Configuration Guide
Complete pinout information for TPS1689 ([data_needed: package type] package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
![[data_needed: package type] package pinout diagram for TPS1689](/assets/package-diagrams/default.svg?v=1787929954)
No detailed pinout data available for TPS1689.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
TPS1689 is suitable for 6 applications: 48V Server Backplane Hot-Swap, Datacenter Power Distribution, Telecom 48V Systems, Industrial Automation Control, High-Current Parallel eFuse Arrays, Test and Measurement Instruments.
48V Server Backplane Hot-Swap
The TPS1689 fits 48V server backplanes because its 9V to 80V operating range and 92V absolute maximum absorb the surge environment of live card insertion, while the integrated 3.5mOhm FET carries up to 20A with minimal conduction loss. Placed at the card power entry, it ramps output slew rate to limit inrush into bulk capacitors and clears short-circuit faults in microseconds. Stackable operation lets two devices share load for 40A rails, with tied IMON pins reporting total current over PMBus to the shelf manager.
Recommended
Datacenter Power Distribution
In datacenter power trees, the TPS1689 provides per-rail electronic fusing with digital observability. The 3.5mOhm integrated FET reduces distribution losses versus discrete fuse-and-controller solutions, and PMBus telemetry streams voltage, current, and temperature to a baseboard controller for predictive fault detection. Configurable current limits and fault responses let operators tune protection per rail without hardware changes, while the -5V negative transient withstand guards against backplane faults during hot removal.
Recommended
Telecom 48V Systems
Telecom -48V and 48V fed equipment benefits from the TPS1689's wide 9V-80V input window and 92V absolute maximum, which cover battery float ranges and surge events common in central offices. The device limits inrush when boards plug into live shelves and disconnects loads during brownouts using programmable undervoltage thresholds. Its stackable architecture supports high-current line cards, and PMBus reporting integrates with remote management for alarming and fault logging across the network.
Recommended
Industrial Automation Control
Industrial controllers and I/O modules use the TPS1689 to protect 24V/48V field power inputs from wiring faults and capacitive inrush. The 80V rating tolerates miswiring and transient events, while overload and thermal shutdown protection isolate failures to the affected branch. PMBus configuration allows one firmware platform to define different current limits across product variants, and the IMON telemetry feeds condition-monitoring systems, improving mean time between failures in factory power distribution.
Recommended
High-Current Parallel eFuse Arrays
For rails exceeding 20A, multiple TPS1689 devices operate in a stackable parallel configuration, each sharing load current while the tied IMON pins produce a single proportional current signal representing the total. This enables 40A to 60A protected feeds without discrete ORing FETs. Uniform PMBus settings ensure balanced current sharing, and the low 3.5mOhm FET per device keeps total conduction losses low - for example, 20A per device dissipates roughly 1.4W at 3.5mOhm, manageable with proper copper pour.
Recommended
Test and Measurement Instruments
Bench instruments and rack systems use the TPS1689 as a resettable, digitally controlled main power switch. Compared with a mechanical fuse, the eFuse provides programmable inrush control for large bulk capacitors, fast short-circuit response protecting expensive internal converters, and PMBus telemetry that lets instrument firmware log supply health. The 80V rating also suits instruments powered from 48V industrial supplies, and thermal shutdown adds a self-protection layer during fault injection testing.
Recommended
Recommended Products Summary
Engineering reference data for TPS1689 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS1689x-Q1 | TPS1685 |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | [DATA_NEEDED: package] | [DATA_NEEDED: package] - same family | [DATA_NEEDED: package] |
| Input Voltage Range | 9 V to 80 V | 9 V to 80 V | [DATA_NEEDED] |
| Maximum Current | 20 A | 20 A | [DATA_NEEDED] |
| FET ON-Resistance | 3.5 mOhm (typ) | 3.5 mOhm (typ) | [DATA_NEEDED] |
| PMBus Telemetry | Yes | Yes | Yes |
| Stackable Operation | Yes | Yes | Yes |
| AEC-Q100 Qualified | No (standard grade) | Yes (automotive) | No |
Key Differentiators
- PMBus digital telemetry and configuration (vs TPS2393)
- Stackable parallel operation with shared IMON (vs TPS1685)
- Integrated 3.5mOhm FET saves board area (vs TPS1689x-Q1)
Design Notes
At 20A continuous load with 3.5mOhm typical FET on-resistance, conduction loss is approximately I^2*R = 1.4W. Provide generous PCB copper area connected to the FET power pins and an array of thermal vias to internal planes to keep junction temperature within limits. Verify worst-case on-resistance at high junction temperature, which is significantly higher than the 25C typical value, and re-run the dissipation calculation accordingly.
Route the 20A power path with wide traces or copper pours sized for the full load current, minimizing series inductance in the input and output loops. Place input and output capacitors close to the device, and connect the PMBus SCL/SDA lines with pullups appropriate for the bus speed. Tie the IMON pin network so parallel devices share a single monitoring node per the TI datasheet parallel configuration guidance.
Configure PMBus current limit, slew rate, and fault response registers to match the actual load capacitance and current draw - default register values may trip during inrush or fail to clear faults fast enough. Respect the 92V absolute maximum: the 9V-80V operating range already includes surge margin for 48V rails, but do not rely on the absolute maximum as an operating point. Verify negative transient behavior at the output when boards are hot-removed.
Compliance Information
Compliance data was not present in the verified web data. The TPS1689x-Q1 variant is the automotive-qualified option; standard TPS1689 is assumed non-automotive. Verify RoHS/REACH status on the TI product page.
