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Texas Instruments UA7908CKTER
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- Part No.:
- UA7908CKTER
- Manufacturer:
- Texas Instruments
- Package:
- TO-252-4, DPAK (3 Leads + Tab)
- Datasheet:
-
UA7908CKTER.pdf
- Description:
- IC REG LIN -8V 1.5A 3POWERFLEX
- Quantity:
- Payment:
- Shipping:
Inventory:4,433
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Product details
Overview
UA7908CKTER from Texas Instruments is a fixed negative-voltage linear regulator delivering –8 V output at up to 1.5 A, featuring internal short-circuit current limiting, thermal overload protection, and dropout voltage of 1.1 V at 1 A. It operates across 0°C to 125°C and requires no external components for basic regulation - used in on-card power conditioning for analog instrumentation and industrial control subsystems.
For engineers reviewing the UA7908CKTER datasheet, UA7908CKTER pinout, UA7908CKTER application, or UA7908CKTER equivalent, key selection criteria include guaranteed –8 V output tolerance (±0.4 V over temperature), input voltage range (–10.5 V to –25 V), ripple rejection (54–60 dB at 120 Hz), thermal resistance (θJA = 23°C/W), and PowerFLEX™ KTE package compatibility with high-power PCB mounting.
Technical Context
The UA7908CKTER implements a monolithic PNP pass transistor architecture with safe-area compensation and built-in current-limiting circuitry that activates before device damage occurs. Its thermal shutdown triggers at ~150°C virtual junction temperature, and bias current remains stable (1.5–2 mA typical) across full input and load ranges.
It functions as a three-terminal fixed-output regulator with common-emitter topology: input connects to collector, output to emitter, and common terminal serves as reference/ground return. No external feedback network is needed - output voltage is trimmed during wafer sort and laser-trimmed for precision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | –8.0 V ±0.3 V at 25°C; –7.6 V to –8.4 V over 0°C–125°C - ensures stable bias for op-amps and ADC references. |
| Output Current | Up to 1.5 A continuous - supports mid-power analog subsystems without heatsink under moderate ambient conditions. |
| Input Voltage Range | –10.5 V to –25 V - accommodates unregulated transformer-rectified supplies with ≥2.5 V headroom for dropout. |
| Ripple Rejection | 54–60 dB at 120 Hz - suppresses line-frequency noise from rectifier stages in linear power supplies. |
| Dropout Voltage | 1.1 V at 1 A load - defines minimum input-to-output differential required to maintain regulation. |
| Thermal Resistance θJA | 23°C/W (PowerFLEX KTE package) - determines max power dissipation (≈1.3 W at 70°C ambient) before thermal shutdown. |
| Operating Temperature | 0°C to 125°C virtual junction - validated for industrial-grade embedded systems with convection cooling. |
Pinout & Package
UA7908CKTER uses the PowerFLEX™ (KTE) flange-mount plastic package - thermally enhanced with exposed metal tab electrically connected to the COMMON terminal. Mounting via screw or clamp to heatsink is required for >500 mA operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Regulator input supply node | Accepts unregulated negative input (–10.5 V to –25 V); must be bypassed with ≥2 µF capacitor. |
| 2 (COMMON) | Reference and thermal pad connection | Serves as ground reference for output; electrically tied to thermal tab - must be connected to system ground and heatsink. |
| 3 (OUTPUT) | Regulated negative output | Delivers stable –8 V; requires ≥1 µF output capacitance for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables compact, low-BOM-cost regulation - only input/output capacitors needed per datasheet recommendations. |
| Internal short-circuit current limiting | Clamps output current to safe level (~2.1 A peak) without external sensing - protects against wiring faults and load shorts. |
| Thermal overload protection | Shuts down regulator when die temperature exceeds ~150°C; auto-recovers after cooldown - prevents permanent failure. |
| Output transistor safe-area compensation | Maintains SOA compliance during transient overloads - avoids second breakdown in the PNP pass device. |
| Low output noise | 200 µV RMS (10 Hz–100 kHz) - suitable for noise-sensitive analog circuits like precision DAC buffers and sensor signal chains. |
Applications
| Industrial Sensor Signal Conditioning | Legacy Analog Test Equipment |
|---|---|
|
Use Scenario: Powering dual-supply op-amps and precision voltage references in 4–20 mA transmitter modules. IC Role / Device Role / Timing Role: Negative rail generator providing clean –8 V for analog front-end biasing. Use Value: Maintains <±0.5% output stability over temperature and load, enabling sub-12-bit measurement accuracy. |
Use Scenario: Replacing aging discrete regulators in benchtop multimeters and oscilloscope auxiliary supplies. IC Role / Device Role / Timing Role: Fixed negative voltage source for analog comparators and display driver ICs. Use Value: Eliminates need for trimming potentiometers and improves long-term drift performance vs. discrete Zener solutions. |
| Programmable Logic Controller (PLC) I/O Modules | Medical Diagnostic Instrumentation |
|
Use Scenario: Supplying isolated analog input channels requiring clean negative bias for signal inversion and level-shifting. IC Role / Device Role / Timing Role: Local regulation stage downstream of isolated DC/DC converter. Use Value: Ripple rejection >54 dB reduces coupling of switching noise into sensitive analog acquisition paths. |
Use Scenario: Biasing photodiode transimpedance amplifiers and low-noise ADC drivers in portable ultrasound front-ends. IC Role / Device Role / Timing Role: Low-noise negative supply rail for analog signal chain components. Use Value: 200 µV output noise and –0.6 mV/°C tempco preserve dynamic range and calibration integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative-voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UA7908CKCS | Same electrical specs; TO-220 (KCS) package with higher θJA (19°C/W) and no integrated thermal tab. | Requires larger heatsink area; less suitable for high-density layouts where flange-mount is preferred. | Select UA7908CKCS if board space allows standard through-hole mounting and thermal management uses clip-on heatsinks. |
| LM337KTP/NOPB | Adjustable negative regulator (–1.25 V to –37 V); requires two external resistors; dropout ~3 V at 1.5 A. | Offers flexibility for non-standard voltages but adds BOM cost and layout complexity. | Choose LM337KTP/NOPB only when variable output or tighter initial tolerance (±1%) is required - not a drop-in replacement. |
Compared with UA7908CKCS and LM337KTP/NOPB, the UA7908CKTER provides optimized thermal performance in surface-mount flange-mount form factor, eliminates adjustment components, and delivers tighter factory-trimmed output voltage - making it ideal for volume industrial designs prioritizing reliability and assembly simplicity.
Availability
UA7908CKTER is available at Aetrix Electronics and suitable for industrial control systems, analog test equipment, and medical diagnostic instrumentation requiring stable component supply and long-lifecycle support.
Supply support for UA7908CKTER 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 company headquartered in Dallas, Texas, designing and manufacturing analog, embedded processing, and logic ICs for industrial, automotive, and communications markets.
The µA7900 series was developed as a complementary family to the µA7800 positive regulators - targeting fixed negative-voltage regulation in legacy and cost-sensitive industrial power systems where simplicity and ruggedness are critical.
FAQ
What is the maximum input voltage rating for UA7908CKTER?
The absolute maximum input voltage for UA7908CKTER is –35 V. However, the recommended operating range is –10.5 V to –25 V to ensure proper regulation, thermal safety, and ripple rejection performance. Exceeding –25 V may increase power dissipation beyond safe limits and reduce reliability - always verify worst-case input ripple and transient peaks in the final design using UA7908CKTER.
Does UA7908CKTER require input and output capacitors?
Yes, UA7908CKTER requires a minimum 2 µF input capacitor and 1 µF output capacitor for stability and transient response, as specified in the TI datasheet. These capacitors must be placed close to the device pins; ceramic or low-ESR tantalum types are recommended. Omitting them risks oscillation or poor load-step performance - this applies directly to every UA7908CKTER implementation.
Is UA7908CKTER pin-compatible with other packages in the µA7900 series?
No - UA7908CKTER uses the PowerFLEX™ KTE package with a unique 3-pin flange-mount footprint, while UA7908CKCS uses TO-220 and UA7908CKTTR uses TO-263. Pin numbering and thermal pad connectivity differ; PCB layout must be redesigned for each package. Always verify mechanical drawings before substituting any UA7908CKTER variant.
What is the output voltage tolerance of UA7908CKTER over temperature?
The UA7908CKTER guarantees an output voltage of –7.6 V to –8.4 V across the full operating junction temperature range of 0°C to 125°C. At 25°C, typical output is –8.0 V with ±0.3 V tolerance. This specification is measured under defined load and input conditions and is integral to the UA7908CKTER's qualification for industrial applications.
Can UA7908CKTER be used in adjustable configurations?
Yes - though designed as a fixed –8 V regulator, UA7908CKTER can be configured as an adjustable regulator using external resistors per TI Application Note SLVA037. However, doing so voids the factory-trimmed accuracy and alters thermal behavior; the resulting circuit is no longer equivalent to the standard UA7908CKTER performance profile.
UA7908CKTER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-252-4, DPAK (3 Leads + Tab)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Negative
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- -25V
- Voltage - Output (Min/Fixed):
- -8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.1V @ 1A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 60dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 3-PowerFLEX™
UA7908CKTER FAQ
1.How can I place an order for UA7908CKTER through Aetrix?
Please submit a Request for Quotation (RFQ) for UA7908CKTER 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 UA7908CKTER reliable?
The price and inventory of UA7908CKTER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA7908CKTER is usually 5 days.
3.What payment methods are accepted for UA7908CKTER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA7908CKTER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA7908CKTER?
UA7908CKTER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA7908CKTER 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 UA7908CKTER?
For technical support, including UA7908CKTER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA7908CKTER requirements.
6.How does Aetrix verify that UA7908CKTER is sourced from the original manufacturer or authorized distributors?
All UA7908CKTER 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 UA7908CKTER meets industry standards.
7.What is the process for return or replacement of UA7908CKTER?
All UA7908CKTER units undergo pre-shipment inspection (PSI). If there is an issue with UA7908CKTER, 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 UA7908CKTER part is unused and in its original packaging.
Return procedure for UA7908CKTER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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