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onsemi MC7905ACD2TR4
- Part No.:
- MC7905ACD2TR4
- Manufacturer:
- onsemi
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
MC7905ACD2TR4.pdf
- Description:
- IC REG LINEAR -5V 1A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,523
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Product details
Overview
MC7905ACD2TR4 from onsemi is a fixed-output negative voltage regulator delivering −5.0 V at up to 1.0 A, featuring internal thermal shutdown, short-circuit current limiting, and safe-area compensation in a D2PAK (TO-263) package. It operates across 0°C to +125°C with ±2% output voltage tolerance and requires no external components for basic regulation in industrial power supplies.
For engineers reviewing the MC7905ACD2TR4 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (1.3 V at 1.0 A), ripple rejection (70 dB at 120 Hz), output noise (40 µV RMS), thermal resistance (JC = 5.0°C/W), and compatibility with standard negative dual-rail op-amp supplies.
Technical Context
This IC implements a monolithic PNP pass transistor-based linear regulation architecture with integrated protection circuitry. Its safe-area compensation dynamically reduces short-circuit current as the VI–VO differential increases, preventing second breakdown during fault conditions.
The device uses internal bandgap reference and error amplifier feedback to maintain stable −5.0 V output under line variations (−7.5 V to −20 V input) and load changes (5 mA to 1.0 A), with load regulation ≤ 9.0 mV and line regulation ≤ 6.0 mV over specified conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −5.0 V nominal, −4.80 V to −5.20 V over temperature and load - ensures stable bias for analog circuits requiring precise negative rail. |
| Max Output Current | 1.0 A continuous - supports medium-power analog subsystems without external boost transistors. |
| Dropout Voltage | 1.3 V at 1.0 A - mandates minimum −6.3 V input for regulated −5.0 V output, critical for low-differential designs. |
| Ripple Rejection | 70 dB at 120 Hz - suppresses AC mains-derived ripple in linear power supplies feeding sensitive analog stages. |
| Thermal Resistance JC | 5.0°C/W - enables high-power dissipation when mounted on heatsink; junction-to-case path dominates thermal design. |
| Output Noise | 40 µV RMS (10 Hz–100 kHz) - low enough for precision op-amp and ADC reference rails without additional filtering. |
| Operating Temperature | 0°C to +125°C junction - suitable for industrial environments without derating below full current. |
Pinout & Package
D2PAK (TO-263) surface-mount package with exposed thermal pad (Terminal 4) electrically connected to Pin 2 (Input). Heatsink surface must be soldered to PCB copper for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground | Reference node for output voltage; common return for input and output circuits. |
| 2 | Input | Negative input supply connection; also tied to heatsink surface - must be routed with low-inductance path. |
| 3 | Output | Regulated −5.0 V source; requires local 1.0 µF ceramic or tantalum capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables compact, low-BOM-count power rails - eliminates need for external pass transistors or compensation networks. |
| Internal thermal overload protection | Shuts down output above +150°C junction temperature - prevents permanent damage during sustained overload or poor heatsinking. |
| Safe-area compensated output transistor | Reduces short-circuit current as VI–VO increases - avoids SOA violation during transient faults like output-to-ground shorts. |
| 2% output voltage tolerance | Tighter than standard 4% variants (e.g., MC7905CTG) - improves accuracy in precision analog signal chains and reference generation. |
| Pb-free D2PAK packaging | RoHS-compliant lead finish (G-suffix) with thermal pad optimized for automated reflow and high-current PCB mounting. |
Applications
| Operational Amplifier Dual Supply | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Powering dual-supply op-amps (e.g., LM741, OPA2134) in data acquisition front-ends. IC Role / Device Role / Timing Role: Provides stable −5.0 V rail paired with +5.0 V regulator (e.g., MC7805) to enable rail-to-rail input/output swing. Use Value: Low 40 µV noise and 70 dB ripple rejection preserve SNR in high-gain amplification stages. | Use Scenario: Biasing bridge-based pressure/temperature sensors and powering associated instrumentation amplifiers. IC Role / Device Role / Timing Role: Supplies clean negative reference for sensor excitation and signal conditioning circuitry in harsh industrial environments. Use Value: Thermal shutdown and safe-area compensation ensure reliability during sensor cable faults or ESD events. |
| Legacy TTL/MECL Logic Power | Programmable Logic Controller (PLC) I/O Modules |
Use Scenario: Generating −5.2 V supply for older MECL 10K logic families requiring tightly regulated negative rails. IC Role / Device Role / Timing Role: Delivers precise −5.0 V output matching MECL system requirements while tolerating wide input ripple. Use Value: ±2% tolerance and 6.0 mV line regulation meet MECL voltage margin specifications without trimming. | Use Scenario: Providing isolated −5.0 V for analog input channel conditioning and digital isolator bias in modular PLC backplanes. IC Role / Device Role / Timing Role: Regulates auxiliary rail for isolated ADC drivers and optocoupler LEDs in DIN-rail mounted I/O modules. Use Value: 1.0 A capability supports multiple parallel channels; D2PAK package allows high-current PCB trace routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC7905CTG | TO-220 package, 4% output tolerance, same 0°C to +125°C range | Lacks D2PAK thermal pad; higher thermal resistance (JA = 65°C/W vs. 70°C/W) | Select when through-hole assembly or lower-cost 4% tolerance is acceptable. |
| LM7905CDT | Same −5.0 V output, TO-263 package, but 4% tolerance and no Pb-free marking | Slightly higher dropout (2.0 V) and lower ripple rejection (65 dB) | Choose if legacy LM7905 footprint compatibility is required and RoHS compliance is not mandatory. |
Compared with MC7905CTG and LM7905CDT, the MC7905ACD2TR4 offers tighter 2% output accuracy, superior thermal performance via D2PAK thermal pad, and guaranteed Pb-free compliance - making it optimal for new industrial designs demanding precision and long-term supply assurance.
Availability
MC7905ACD2TR4 is available at Aetrix Electronics and suitable for industrial sensor interfaces, programmable logic controller (PLC) I/O modules, and operational amplifier dual-supply systems requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for MC7905ACD2TR4 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
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The MC7900 Series was designed specifically to provide rugged, drop-in complementary negative regulators for legacy and new designs using the widely adopted MC7800 positive regulator family - targeting cost-sensitive, high-reliability linear power applications.
FAQ
What is the maximum input voltage rating for the MC7905ACD2TR4?
The MC7905ACD2TR4 has a maximum input voltage rating of −35 V DC for output voltages between −5.0 V and −18 V. This limit ensures safe operation of the internal pass transistor and protection circuitry under transient overvoltage conditions commonly found in unregulated industrial DC bus lines.
Does the MC7905ACD2TR4 require input and output capacitors for stable operation?
Yes, the MC7905ACD2TR4 requires a 0.33 µF input bypass capacitor and a 1.0 µF output capacitor for stable operation. These capacitors suppress high-frequency noise and improve transient response - especially critical when the regulator is located remotely from the bulk filter or driving dynamic loads like op-amp inputs.
How does the safe-area compensation feature function in the MC7905ACD2TR4?
The safe-area compensation in the MC7905ACD2TR4 reduces short-circuit output current as the input-to-output voltage differential increases. This prevents second breakdown of the internal PNP pass transistor during output faults, allowing the device to survive sustained shorts without damage - a key reliability feature absent in basic linear regulators.
Can the MC7905ACD2TR4 be used in constant-current source configurations?
Yes, the MC7905ACD2TR4 can be configured as a constant-current source by connecting a resistor between output and ground, leveraging its precise −5.0 V reference. The output current equals (5.0 V / R) + quiescent bias current (~4.4 mA), enabling simple LED biasing or sensor excitation circuits without additional ICs.
What thermal management considerations apply to the MC7905ACD2TR4 in D2PAK package?
The MC7905ACD2TR4 in D2PAK package relies on its exposed thermal pad (Terminal 4, connected to Pin 2) for heat transfer. For 1.0 A operation, the PCB must include ≥ 25 cm² of 2-oz copper connected to the pad; thermal resistance drops from ~70°C/W (free air) to ~15°C/W with proper layout - essential to maintain junction temperature below +150°C.
MC7905ACD2TR4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- 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):
- -5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 70dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-3
MC7905ACD2TR4 FAQ
1.How can I place an order for MC7905ACD2TR4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7905ACD2TR4 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 MC7905ACD2TR4 reliable?
The price and inventory of MC7905ACD2TR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7905ACD2TR4 is usually 5 days.
3.What payment methods are accepted for MC7905ACD2TR4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7905ACD2TR4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7905ACD2TR4?
MC7905ACD2TR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7905ACD2TR4 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 MC7905ACD2TR4?
For technical support, including MC7905ACD2TR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7905ACD2TR4 requirements.
6.How does Aetrix verify that MC7905ACD2TR4 is sourced from the original manufacturer or authorized distributors?
All MC7905ACD2TR4 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 MC7905ACD2TR4 meets industry standards.
7.What is the process for return or replacement of MC7905ACD2TR4?
All MC7905ACD2TR4 units undergo pre-shipment inspection (PSI). If there is an issue with MC7905ACD2TR4, 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 MC7905ACD2TR4 part is unused and in its original packaging.
Return procedure for MC7905ACD2TR4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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