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STMicroelectronics L7906CD2T-TR
- Part No.:
- L7906CD2T-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
L7906CD2T-TR.pdf
- Description:
- IC REG LINEAR -6V 1.5A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,563
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Product details
Overview
L7906CD2T-TR from STMicroelectronics is a fixed-output, three-terminal negative voltage regulator delivering -6 V at up to 1.5 A, featuring thermal overload protection, short-circuit protection, and output transition SOA protection. It is housed in a D²PAK package and designed for local on-card regulation in split-supply systems, such as ±15 V analog front-ends in industrial instrumentation.
For engineers reviewing the L7906CD2T-TR datasheet, L7906CD2T-TR pinout, L7906CD2T-TR application, or L7906CD2T-TR equivalent, key selection criteria include guaranteed -6 V output tolerance (±5%), dropout voltage of 1.4 V at 1 A, junction-to-case thermal resistance of 3 °C/W, and compatibility with solid tantalum output capacitors for stability.
Technical Context
The L7906CD2T-TR operates as a monolithic PNP-based linear regulator with internal current limiting, thermal shutdown, and safe-area protection. Its architecture ensures stable regulation under varying load (5 mA to 1.5 A) and input voltage (-9 V to -21 V) conditions while maintaining output drift of -0.8 mV/°C.
It requires no external components for basic operation but supports adjustable configurations via external resistors. The device is optimized for use with CI = 2.2 µF (input) and CO = 1 µF (output) solid tantalum capacitors, and includes built-in supply voltage rejection of 54–60 dB at 120 Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | -6 V ±5% (guaranteed over temperature and load, enabling precise biasing in dual-rail op-amp circuits) |
| Max Output Current | 1.5 A continuous (with adequate heatsinking; supports high-current analog subsystems without external pass transistors) |
| Dropout Voltage | 1.4 V at IO = 1 A, ΔVO = 100 mV (dictates minimum input headroom for reliable -6 V regulation) |
| Supply Voltage Rejection | 54–60 dB at 120 Hz (attenuates ripple from unregulated DC supplies, critical for low-noise analog stages) |
| Thermal Resistance (Junction-to-Case) | 3 °C/W (enables high-power dissipation in D²PAK when mounted to PCB copper pour or heatsink) |
| Output Noise Voltage | 200 µV RMS (10 Hz–100 kHz; suitable for precision signal conditioning where low noise is mandatory) |
| Line Regulation | 120 mV (VI = -15 V to -21 V, TJ = 25°C; ensures stable output despite input rail variation) |
Pinout & Package
Package: D²PAK (TO-263), surface-mount, thermally enhanced plastic package with exposed drain pad for efficient heat transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Unregulated negative input supply | Accepts -9 V to -21 V DC; must be decoupled with ≥2.2 µF solid tantalum capacitor near pin |
| 2 (Ground) | Circuit common reference | Connects to system ground plane; serves as return path for load current and internal bias networks |
| 3 (Output) | Regulated negative output | Delivers stable -6 V; requires ≥1 µF solid tantalum capacitor directly at pin for stability and transient response |
Key Features
| Feature | Design Value |
|---|---|
| Thermal Overload Protection | Shuts down regulator when junction temperature exceeds 150 °C, preventing permanent damage during sustained overload or poor heatsinking |
| Short-Circuit Current Limit | Clamps output current to ~1.5 A (typical), allowing safe indefinite short-circuit operation without latch-up or destruction |
| SOA Protection | Monitors voltage-current product across internal pass transistor to prevent second breakdown during transient overloads |
| Low Quiescent Current | 3 mA typical at 25 °C, minimizing standby power loss in battery-backed or energy-sensitive systems |
| High Ripple Rejection | 60 dB SVR at 120 Hz enables clean -6 V rail from rectified AC-derived supplies without additional filtering stages |
Applications
| Industrial Analog Signal Chains | Bipolar Op-Amp Power Supplies |
|---|---|
|
Use Scenario: Precision sensor signal conditioning in PLC I/O modules using dual-supply op-amps and ADC drivers. IC Role / Device Role / Timing Role: Provides stable -6 V rail for op-amp negative supply, complementing +6 V from L7806 counterpart in split-rail configuration. Use Value: Enables full-scale input swing and rail-to-rail output capability in instrumentation amplifiers, improving dynamic range by >12 dB versus single-supply designs. |
Use Scenario: Dual-rail power for audio line drivers and active filters in broadcast equipment. IC Role / Device Role / Timing Role: Delivers low-noise -6 V supply to bipolar op-amps (e.g., NE5532, OPA2134), minimizing THD+N in signal paths. Use Value: 200 µV RMS output noise and 60 dB SVR reduce audible hum and intermodulation distortion in line-level analog outputs. |
| Programmable Logic Controller (PLC) Backplanes | Test & Measurement Equipment |
|
Use Scenario: Local regulation on modular I/O card backplanes requiring isolated -6 V for analog output DACs and isolation interface ICs. IC Role / Device Role / Timing Role: On-card negative regulator eliminating long-trace distribution losses and ground bounce in multi-channel analog output modules. Use Value: 1.5 A output capacity supports simultaneous driving of multiple 4–20 mA loops with HART modulation, reducing need for external boost circuitry. |
Use Scenario: Calibration-grade power for reference voltage buffers and metrology-grade ADC front-ends. IC Role / Device Role / Timing Role: Supplies ultra-stable -6 V to buried-zener references and low-drift instrumentation amplifiers in multimeter and source-measure units. Use Value: -0.8 mV/°C output drift and ±5% initial accuracy ensure <10 ppm/°C system-level temperature coefficient in 6½-digit measurement architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative fixed-voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM337LD-TR | Adjustable output (−1.25 V to −37 V); requires two external resistors; higher quiescent current (5 mA) | Used where programmability or non-standard voltages (e.g., −7.2 V) are needed; less accurate than fixed L79xx series | Select when design flexibility outweighs need for tight output tolerance and lower IQ |
| MC7906CT | TO-220 package; RthJA = 50 °C/W vs. D²PAK's 62.5 °C/W; same electrical specs but lower thermal performance in SMT layouts | Suitable for through-hole prototyping or legacy board designs; not recommended for high-density SMT production | Choose only if mechanical constraints require through-hole mounting or existing TO-220 footprint reuse |
Compared with LM337LD-TR and MC7906CT, the L7906CD2T-TR offers superior thermal efficiency in surface-mount layouts, tighter initial output accuracy (±5% vs. ±10% for LM337), and lower quiescent current-making it optimal for space-constrained, high-reliability industrial SMT applications.
Availability
L7906CD2T-TR is available at Aetrix Electronics and suitable for industrial automation, test & measurement equipment, and programmable logic controller (PLC) backplanes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for L7906CD2T-TR 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, Switzerland, designing and manufacturing microcontrollers, power management ICs, analog chips, and discrete devices for industrial, automotive, and consumer markets.
The L79xxC series was developed specifically for robust, cost-effective local regulation in industrial control and instrumentation systems-emphasizing thermal resilience, fault protection, and compatibility with the complementary L78xx positive regulator family.
FAQ
What is the minimum input voltage required for stable -6 V output?
The L7906CD2T-TR requires a minimum input voltage of -9 V (DC) to maintain regulation at full 1.5 A load, based on its 1.4 V dropout specification. At lighter loads (<100 mA), input as low as -7.5 V may suffice, but design margin should retain ≥2 V headroom to accommodate line transients and thermal derating.
Can this regulator be used with aluminum electrolytic output capacitors?
Yes, but only with ≥10× the recommended 1 µF solid tantalum value-i.e., ≥10 µF aluminum electrolytic-to ensure phase margin and avoid oscillation. ST explicitly states that aluminum types require larger values due to higher ESR; using undersized aluminum caps risks instability and output overshoot during load steps.
Does the D²PAK package require a thermal pad connection to PCB ground?
No-the exposed pad on the D²PAK is internally connected to the output terminal (pin 3), not ground. It must be soldered to a dedicated -6 V copper pour for thermal conduction. Connecting it to ground creates a short circuit; routing it to output improves thermal resistance by up to 40% versus standard land patterns.
How does thermal overload protection behave during sustained overload?
When junction temperature reaches ~150 °C, the device enters thermal shutdown, turning off the pass transistor until temperature falls by ~15 °C. It then auto-restarts. This hiccup-mode cycling prevents damage but causes output interruption-so sustained overloads require external current limiting or heatsink redesign to avoid functional disruption.
L7906CD2T-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Negative
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- -35V
- Voltage - Output (Min/Fixed):
- -6V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.4V @ 1A (Typ)
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 3 mA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
L7906CD2T-TR FAQ
1.How can I place an order for L7906CD2T-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for L7906CD2T-TR 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 L7906CD2T-TR reliable?
The price and inventory of L7906CD2T-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7906CD2T-TR is usually 5 days.
3.What payment methods are accepted for L7906CD2T-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7906CD2T-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L7906CD2T-TR?
L7906CD2T-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L7906CD2T-TR 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 L7906CD2T-TR?
For technical support, including L7906CD2T-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7906CD2T-TR requirements.
6.How does Aetrix verify that L7906CD2T-TR is sourced from the original manufacturer or authorized distributors?
All L7906CD2T-TR 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 L7906CD2T-TR meets industry standards.
7.What is the process for return or replacement of L7906CD2T-TR?
All L7906CD2T-TR units undergo pre-shipment inspection (PSI). If there is an issue with L7906CD2T-TR, 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 L7906CD2T-TR part is unused and in its original packaging.
Return procedure for L7906CD2T-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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