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STMicroelectronics STV8131
- Part No.:
- STV8131
- Manufacturer:
- STMicroelectronics
- Package:
- Heptawatt-7 (Vertical, Bent and Staggered Leads)
- Datasheet:
-
STV8131.pdf
- Description:
- IC REG LIN 5/8V 1A/1A 7HEPTAWATT
- Quantity:
- Payment:
- Shipping:
Inventory:4,809
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Product details
Overview
STV8131 from STMicroelectronics is a monolithic dual positive voltage regulator providing fixed 5 V ±2% and 8 V ±2% outputs with up to 1 A per channel, TTL-disable control on both outputs, short-circuit and thermal protection, and 1.4 V typical dropout at 750 mA - used in multi-rail consumer power supplies and legacy set-top box mainboards.
For engineers reviewing the STV8131 datasheet, STV8131 pinout, STV8131 application, or STV8131 equivalent, key selection considerations include independent TTL disable capability per output, Darlington-based low-dropout architecture, dual-input supply dependency (VIN2 requires VIN1), and ±100 ppm/°C thermal drift of output voltage.
Technical Context
The STV8131 integrates two independent linear regulators sharing a single zener-trimmed reference, with VIN1 powering both the reference and Regulator 1, while VIN2 powers only Regulator 2 - making Regulator 2 nonfunctional if VIN1 is unpowered. Each output uses a Darlington pass stage delivering 1.2 V typical dropout.
Disable logic activates when TTL-level low (<0.8 V) is applied to Pin 3 (Output 2) or Pin 5 (Output 1), forcing corresponding output into high-impedance shutdown. Thermal shutdown triggers at 145 °C junction temperature, and short-circuit current is internally limited to 1.6 A (VIN2 ≤16 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 Voltage | 5 V ±2% (4.9–5.1 V at 10 mA; 4.8–5.2 V across 5–750 mA load) |
| Output 2 Voltage | 8 V ±2% (7.84–8.16 V at 10 mA; 7.7–8.3 V across 5–750 mA load) |
| Max Output Current | 1 A per output (internally current-limited; short-circuit safe up to VIN2 = 16 V) |
| Dropout Voltage | 1.4 V typical at 750 mA (enables operation with VIN1 ≥6.4 V for 5 V output) |
| Disable Threshold | VDISL = 0.8 V max (TTL-compatible active-low enable; VDISH = 2 V min) |
| Thermal Shutdown | 145 °C junction temperature (self-resetting after cooldown; RTH(j-c) = 3 °C/W max) |
| Line Regulation | ≤80 mV over 7–14 V VIN1 and 10–14 V VIN2 (supports variable input rails) |
Pinout & Package
STV8131 is housed in a 9-pin multilayer ceramic package (JEDEC MO-179AA), with exposed thermal pad for enhanced heat dissipation. Pin 1 is VIN1, Pin 2 is GND, Pin 3 is DIS2, Pin 4 is VIN2, Pin 5 is DIS1, Pin 6 is OUT2, Pin 7 is OUT1, Pin 8 is NC, Pin 9 is NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (VIN1) | Main input supply for reference and Regulator 1 | Must be powered for both outputs to operate; max 20 V DC |
| Pin 2 (GND) | Common ground reference | Shared return path for both regulators and disable inputs |
| Pin 3 (DIS2) | Active-low disable for Output 2 | Drives OUT2 high-Z when ≤0.8 V; draws ≤2 µA bias current |
| Pin 4 (VIN2) | Input supply for Regulator 2 only | Independent of VIN1 but requires VIN1 active; max 20 V DC |
| Pin 5 (DIS1) | Active-low disable for Output 1 | Drives OUT1 high-Z when ≤0.8 V; TTL-compatible interface |
| Pin 6 (OUT2) | 8 V regulated output | Delivers up to 1 A; Darlington stage enables 1.2 V typical dropout |
| Pin 7 (OUT1) | 5 V regulated output | Delivers up to 1 A; shares reference with OUT2; thermally coupled |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent TTL-disable control | Enables selective rail shutdown without external logic - critical for power sequencing in multi-voltage systems |
| Shared precision zener reference | Zener-zap trimmed during test ensures tight 5 V/8 V matching and <100 ppm/°C thermal drift |
| Darlington pass transistor topology | Reduces dropout to 1.4 V at 750 mA - extends usable input range vs. standard series regulators |
| Integrated thermal & short-circuit protection | Self-limiting behavior prevents damage during overload; no external components required |
| Multi-rail supply dependency architecture | VIN1 powers reference and OUT1; OUT2 functional only when VIN1 is present - enforces safe power-up order |
Applications
| Cable Set-Top Box Power Supply | DVD Player Mainboard |
|---|---|
Use Scenario: Provides isolated 5 V and 8 V rails for MPEG decoder ICs, front-panel microcontrollers, and analog video circuitry. IC Role / Device Role / Timing Role: Dual-output linear regulator managing primary system power domains with independent enable control. Use Value: Eliminates need for two discrete regulators and external disable logic, reducing BOM count and PCB area by ~35%. | Use Scenario: Supplies 5 V to servo motor drivers and 8 V to laser diode bias circuits in optical pickup assemblies. IC Role / Device Role / Timing Role: Precision dual-rail regulator enabling simultaneous activation and independent shutdown of mechanical and optical subsystems. Use Value: TTL-disable allows laser diode bias (8 V) to remain off until servo alignment completes - preventing premature lasing. |
| Legacy LCD Monitor Logic Board | Industrial HMI Display Module |
Use Scenario: Powers 5 V FPGA configuration circuitry and 8 V gate driver ICs for CCFL backlight inverters. IC Role / Device Role / Timing Role: Dual-rail regulator supporting staggered power-up: 5 V first for logic initialization, then 8 V for backlight enable. Use Value: Built-in VIN1-dependent architecture enforces correct sequencing without external timing components. | Use Scenario: Delivers 5 V to ARM9 application processor and 8 V to touch-screen controller ASIC in compact panel designs. IC Role / Device Role / Timing Role: Compact dual-output regulator minimizing thermal coupling between logic and analog power domains. Use Value: Low 3 °C/W junction-to-case thermal resistance supports convection-cooled enclosures up to 70 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-5.0/LM2678-8.0 (dual discrete) | Switching regulators (85% efficiency); no shared reference; higher ripple (100 mVPP) | Used where thermal budget is constrained and input voltage >12 V | Select when efficiency >75% required and noise tolerance permits switching artifacts |
| TPS7A4700RGWR + TPS7A3301RGWR | Ultra-low-noise LDOs (4.7 µVRMS); separate enable pins; no VIN1/VIN2 dependency | Preferred for audio codec and ADC reference supplies requiring <10 µV noise | Choose when PSRR >70 dB at 1 kHz and <5 µVRMS noise are mandatory |
Compared with LM2678-based discrete solutions, STV8131 offers tighter output matching and simpler layout but lower efficiency; versus TPS7A47/33 pairs, it trades noise performance for integration density and cost - ideal for space-constrained legacy consumer systems where 1.4 V dropout and TTL disable are design priorities.
Availability
STV8131 is available at Aetrix Electronics and suitable for cable set-top boxes, DVD player mainboards, legacy LCD monitor logic boards, and industrial HMI display modules requiring stable component supply despite end-of-life status.
Supply support for STV8131 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
The STV8131 belongs to ST's legacy linear regulator product line, engineered specifically for cost-sensitive, space-constrained multi-rail consumer electronics requiring precise dual-voltage outputs and simple TTL-level power sequencing.
FAQ
Can STV8131 operate with VIN2 supplied while VIN1 is unpowered?
No. The internal voltage reference and Regulator 1 are powered exclusively from Pin 1 (VIN1). If VIN1 is unpowered or below 5 V, Regulator 2 cannot function - even if VIN2 is present and within specification. This dependency enforces strict power-up sequencing and prevents unintended 8 V output activation.
What is the minimum input voltage required to maintain regulation on the 5 V output at 1 A load?
At 1 A load, the dropout voltage is 2 V maximum (per datasheet Table 4). Therefore, VIN1 must be ≥7 V to sustain 5 V output regulation. Below 7 V, OUT1 enters dropout and output voltage drops linearly with input.
Is the STV8131 RoHS-compliant and halogen-free?
Yes. STV8131 is offered in ECOPACK®-compliant packages meeting RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. Package markings include "E" suffix per ST's ECOPACK grade documentation.
Does STV8131 require external capacitors for stability?
Yes. A minimum 10 µF tantalum or 22 µF aluminum electrolytic capacitor is required on each output (OUT1 and OUT2) for stability under full-load transient conditions. Input bypass (≥1 µF ceramic) at VIN1 is also recommended to suppress high-frequency noise.
STV8131 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- Heptawatt-7 (Vertical, Bent and Staggered Leads)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 5V, 8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.4V @ 750mA, 2V @ 1A
- Current - Output:
- 1A, 1A
- Current - Quiescent (Iq):
- 2 mA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 7-HEPTAWATT
STV8131 FAQ
1.How can I place an order for STV8131 through Aetrix?
Please submit a Request for Quotation (RFQ) for STV8131 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 STV8131 reliable?
The price and inventory of STV8131 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STV8131 is usually 5 days.
3.What payment methods are accepted for STV8131?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STV8131 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STV8131?
STV8131 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STV8131 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 STV8131?
For technical support, including STV8131 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STV8131 requirements.
6.How does Aetrix verify that STV8131 is sourced from the original manufacturer or authorized distributors?
All STV8131 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 STV8131 meets industry standards.
7.What is the process for return or replacement of STV8131?
All STV8131 units undergo pre-shipment inspection (PSI). If there is an issue with STV8131, 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 STV8131 part is unused and in its original packaging.
Return procedure for STV8131:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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