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onsemi MC7905CD2TR4
- Part No.:
- MC7905CD2TR4
- Manufacturer:
- onsemi
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
MC7905CD2TR4.pdf
- Description:
- IC REG LINEAR -5V 1A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,339
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Product details
Overview
MC7905CD2TR4 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 for rugged operation in industrial power supplies. It uses D2PAK (TO-263) package with heatsink-connected pin 2, requires no external components for basic regulation, and maintains ±2% output tolerance over 0°C to +125°C junction temperature.
For engineers reviewing the MC7905CD2TR4 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 dual-rail op-amp supply designs requiring stable −5 V rails.
Technical Context
The MC7905CD2TR4 implements a monolithic bipolar pass transistor with integrated protection circuitry: thermal overload detection triggers shutdown before junction temperature exceeds +150°C, while current limiting caps peak output at ~1.8 A under short-circuit conditions. Safe-area compensation dynamically reduces short-circuit current as VIN−VOUT increases, preventing second breakdown.
Its internal topology includes precision bandgap reference, error amplifier, and Darlington pass element - all optimized for fixed negative regulation without external feedback. The device operates with input voltages down to −35 V (for −5 V output), requires ≥2.0 V headroom for regulation, and supports capacitor-stabilized operation with 0.33 µF input and 1.0 µF output bypassing per standard application circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −5.0 V nominal, −4.80 V to −5.20 V over full operating range - ensures stable bias for analog circuits requiring precise negative rail |
| Output Current | 1.0 A continuous - sufficient for powering op-amps, logic interfaces, and sensor signal chains without external boost transistors |
| Dropout Voltage | 1.3 V at 1.0 A and +25°C - defines minimum input-to-output differential needed to sustain regulation under full load |
| Ripple Rejection | 70 dB at 120 Hz - suppresses AC line ripple in unregulated DC 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 management |
| Line Regulation | ≤7.0 mV over −7.5 V ≤ VIN ≤ −25 V - limits output drift due to input variation, critical for stable reference generation |
| Load Regulation | ≤11 mV from 5 mA to 1.5 A - ensures consistent voltage across dynamic load changes in mixed-signal systems |
Pinout & Package
D2PAK (TO-263) surface-mount package with exposed metal tab (pin 2) thermally and electrically connected to the input terminal. Heatsink mounting required for >500 mA continuous operation. Pin 1 is Ground, pin 2 is Input, pin 3 is Output.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Ground | Common reference node for internal bias and error amplifier; must be low-impedance connection to system ground plane |
| Pin 2 | Input | Unregulated negative input supply; also serves as heatsink interface - electrically tied to case for thermal conduction |
| Pin 3 | Output | Regulated −5.0 V output; connects directly to load with minimal trace inductance to maintain stability |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated feedback network and reference eliminate need for external resistors or capacitors in basic configurations |
| Internal thermal overload protection | Automatic shutdown at +150°C junction temperature prevents permanent damage during sustained overload or poor heatsinking |
| Safe-area compensated output transistor | Reduces short-circuit current as VIN−VOUT rises - avoids second-breakdown failure in high-differential-voltage faults |
| 2% output voltage tolerance | Tighter initial accuracy than standard 4% variants - reduces need for post-regulation trimming in precision analog systems |
| Pb-free D2PAK packaging | G-suffix indicates RoHS-compliant lead finish and compatible with standard reflow profiles for automated assembly |
Applications
| Operational Amplifier Dual Supply | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Powering dual-supply op-amps (e.g., TL084, OPA2134) in data acquisition front-ends where symmetric ±5 V rails are required. IC Role / Device Role / Timing Role: Provides regulated −5 V rail complementary to +5 V from MC7805 or similar positive regulator. Use Value: Enables rail-to-rail input/output swing and low-noise performance by maintaining tight voltage stability under varying load currents. | Use Scenario: Biasing precision instrumentation amplifiers and analog front-ends in industrial temperature/pressure sensors. IC Role / Device Role / Timing Role: Supplies clean, low-noise negative reference for ADC drivers and transducer excitation circuits. Use Value: 40 µV RMS output noise and 70 dB ripple rejection preserve signal integrity in sub-mV-level measurements. |
| Legacy TTL/CMOS Logic Interface | Embedded Microcontroller Peripherals |
Use Scenario: Generating −5 V for older ECL or TTL-compatible level-shifting circuits in legacy test equipment. IC Role / Device Role / Timing Role: Delivers stable negative rail for interfacing between modern microcontrollers and vintage logic families. Use Value: Robust short-circuit protection prevents latch-up or damage during hot-plug or bus contention events. | Use Scenario: Powering analog peripherals (DACs, comparators, voltage references) in ARM Cortex-M or PIC-based embedded controllers. IC Role / Device Role / Timing Role: Isolates analog subsystems from noisy digital supply domains using dedicated negative regulation. Use Value: Internal thermal shutdown ensures safe operation during firmware crashes that cause sustained analog load faults. |
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, same −5.0 V output and 1.0 A rating but 4% tolerance and higher θJA (65°C/W) | Suitable for through-hole prototyping or lower-power applications where heatsinking is less constrained | Select when manual assembly or breadboarding is preferred and ±4% output accuracy is acceptable |
| LM7905CT | Same pinout and function but from Texas Instruments; 4% tolerance, 1.5 A peak current, slightly higher dropout (2.0 V) | Compatible with existing MC79xx PCB footprints but requires verification of thermal margin at full load | Choose for multi-source procurement strategy where TI's long-term availability is prioritized over tighter tolerance |
Compared with MC7905CTG and LM7905CT, the MC7905CD2TR4 offers superior thermal performance (θJC = 5.0°C/W vs. ~10°C/W for TO-220), tighter 2% output tolerance, and surface-mount compatibility - making it optimal for space-constrained, high-reliability industrial PCBs requiring precise negative regulation.
Availability
MC7905CD2TR4 is available at Aetrix Electronics and suitable for industrial power supplies, analog signal chains, and embedded controller peripherals requiring stable component supply, RoHS compliance, and surface-mount manufacturability.
Supply support for MC7905CD2TR4 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 sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC7900 series was designed specifically for robust, drop-in replacement of legacy 79xx regulators in industrial and instrumentation applications - emphasizing thermal resilience, fault tolerance, and compatibility with legacy designs.
FAQ
What is the maximum input voltage rating for the MC7905CD2TR4?
The MC7905CD2TR4 has a maximum input voltage rating of −35 VDC when regulating −5.0 V output. This rating applies across the full operating temperature range and accounts for worst-case ripple superimposed on the DC input. Exceeding −35 V risks permanent damage even with thermal protection active, as voltage breakdown occurs before thermal shutdown triggers.
Does the MC7905CD2TR4 require input and output capacitors for stable operation?
Yes, the MC7905CD2TR4 requires a 0.33 µF input capacitor and 1.0 µF output capacitor for stable operation per the datasheet. These values ensure adequate high-frequency bypassing and transient response; omitting them may cause oscillation or poor ripple rejection. Ceramic or low-ESR tantalum types are recommended, with leads kept as short as possible to minimize inductance.
Can the MC7905CD2TR4 be used in parallel to increase output current?
No, the MC7905CD2TR4 is not designed for parallel operation. Its output voltage tolerance (±2%) and lack of current-sharing features mean paralleling units will cause unequal current distribution and potential thermal runaway. For higher current, use a single higher-rated regulator or implement an external pass transistor as shown in Figure 9 of the datasheet.
What is the thermal resistance from junction to case (θJC) for the MC7905CD2TR4?
The thermal resistance from junction to case (θJC) for the MC7905CD2TR4 is 5.0°C/W, measured with proper heatsink mounting to pin 2 (the exposed tab). This value assumes full metal-to-metal contact and thermal interface material; actual performance degrades significantly with poor mounting pressure or oxidized surfaces.
Is the MC7905CD2TR4 pin-compatible with other D2PAK negative regulators like MC7912CD2TR4?
Yes, the MC7905CD2TR4 is pin-compatible with other MC79xx-series D2PAK variants (e.g., MC7912CD2TR4, MC7915CD2TR4) - all share identical pin 1 (GND), pin 2 (IN), pin 3 (OUT) assignments and D2PAK mechanical footprint. However, output voltage differs, so direct substitution alters system rail levels and requires validation of downstream component voltage ratings.
MC7905CD2TR4 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
MC7905CD2TR4 FAQ
1.How can I place an order for MC7905CD2TR4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7905CD2TR4 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 MC7905CD2TR4 reliable?
The price and inventory of MC7905CD2TR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7905CD2TR4 is usually 5 days.
3.What payment methods are accepted for MC7905CD2TR4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7905CD2TR4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7905CD2TR4?
MC7905CD2TR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7905CD2TR4 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 MC7905CD2TR4?
For technical support, including MC7905CD2TR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7905CD2TR4 requirements.
6.How does Aetrix verify that MC7905CD2TR4 is sourced from the original manufacturer or authorized distributors?
All MC7905CD2TR4 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 MC7905CD2TR4 meets industry standards.
7.What is the process for return or replacement of MC7905CD2TR4?
All MC7905CD2TR4 units undergo pre-shipment inspection (PSI). If there is an issue with MC7905CD2TR4, 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 MC7905CD2TR4 part is unused and in its original packaging.
Return procedure for MC7905CD2TR4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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