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onsemi MC7905BD2TR4
- Part No.:
- MC7905BD2TR4
- Manufacturer:
- onsemi
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
MC7905BD2TR4.pdf
- Description:
- IC REG LINEAR -5V 1A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,556
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Product details
Overview
MC7905BD2TR4 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 a D2PAK (TO-263) package with heatsink-connected pin 2 and operates across −40°C to +125°C.
For engineers reviewing the MC7905BD2TR4 datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal performance data, real-world design guidance for dual-rail op-amp supplies and current-boost configurations, and validated alternative parts for voltage-regulated negative rail generation.
Technical Context
The MC7905BD2TR4 implements a monolithic PNP pass transistor architecture with built-in protection circuitry including foldback current limiting and thermal shutdown triggered at +150°C junction temperature. Its dropout voltage remains stable at 1.3 V under 1.0 A load at +25°C, enabling reliable regulation even with modest input-to-output differential.
It achieves 70 dB ripple rejection at 120 Hz with 20 mA load and exhibits low output noise of 40 µV RMS (10 Hz–100 kHz). Line regulation is specified at 2.0 mV over −8.0 V to −12 V input range at 1.0 A, while load regulation holds within 4.0 mV from 250 mA to 750 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −5.0 V ±2% (−4.8 V to −5.2 V at +25°C), ensuring stable bias for analog circuits requiring precise negative rails |
| Maximum Output Current | 1.0 A continuous, sufficient for powering op-amps, sensors, and logic interfaces in embedded systems |
| Dropout Voltage | 1.3 V at 1.0 A and +25°C, allowing operation with minimal headroom-e.g., −6.3 V input sustains −5.0 V output |
| Ripple Rejection | 70 dB at 120 Hz, effectively suppressing AC line noise in linear power supply designs |
| Thermal Resistance (Junction-to-Case) | 5.0 °C/W, enabling high-power dissipation when mounted on an external heatsink |
| Operating Temperature Range | −40°C to +125°C, supporting deployment in automotive engine control units and industrial motor drives |
| Package | D2PAK (TO-263), surface-mount with exposed thermal pad connected to pin 2 (input), optimized for PCB heat spreading |
Pinout & Package
D2PAK (TO-263) package with heatsink surface electrically connected to pin 2. Pin 1 is Ground, pin 2 is Input (VI), and pin 3 is Output (VO). The exposed metal tab serves as the primary thermal path and must be soldered to a large copper pour for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Ground (GND) | Reference node for internal biasing and feedback; must connect to system ground plane with low-inductance path |
| Pin 2 | Input (VI) | Negative input supply terminal; also connects to heatsink surface-requires isolation from other potentials unless referenced to input rail |
| Pin 3 | Output (VO) | Regulated −5.0 V output; requires local 1.0 µF tantalum or ceramic capacitor for stability and transient response |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained regulation with internal feedback network-eliminates need for external resistors or compensation capacitors in standard applications |
| Internal thermal overload protection | Automatic shutdown at +150°C junction temperature prevents damage during sustained overload or poor heatsinking |
| Internal short-circuit current limiting | Foldback current limit protects device and upstream supply during output faults; typical trip at ~1.8 A |
| Safe-area compensated output transistor | Prevents secondary breakdown under high-voltage/high-current stress-enables robust operation across full VI–VO differential range |
| Pb-free packaging | G-suffix denotes RoHS-compliant lead finish; compatible with standard reflow profiles per J-STD-020 |
Applications
| Operational Amplifier Dual Supply | Industrial Sensor Biasing |
|---|---|
|
Use Scenario: Powering precision op-amps (e.g., LM741, OP27) requiring symmetrical ±15 V or ±12 V rails. IC Role / Device Role / Timing Role: Negative rail generator providing clean, regulated −5.0 V reference for signal conditioning stages. Use Value: Enables rail-to-rail input common-mode range and reduces offset drift via stable bias-critical for 16-bit ADC front-ends. |
Use Scenario: Supplying negative bias to MEMS accelerometers, pressure transducers, and RTD bridge circuits. IC Role / Device Role / Timing Role: Low-noise negative voltage source maintaining sensor excitation integrity amid EMI-rich factory environments. Use Value: 40 µV RMS output noise and 70 dB ripple rejection preserve signal-to-noise ratio in sub-mV-level sensor outputs. |
| Current-Boosted Constant Current Source | Legacy TTL/CMOS Logic Interface |
|
Use Scenario: Generating 200 mA constant current for LED drivers or laser diode bias using MC7905BD2TR4 in current-source configuration. IC Role / Device Role / Timing Role: Core current-setting element with quiescent bias current (4.3 mA) contributing to total output accuracy. Use Value: Predictable IO = 5.0 V/R + 4.3 mA enables ±1% current setting with 1% tolerance resistor-no additional sensing needed. |
Use Scenario: Providing −5.0 V logic-level reference for ECL or older MECL digital systems requiring negative supply rails. IC Role / Device Role / Timing Role: Fixed-voltage regulator meeting MECL III specification for −5.2 V nominal operation with tight tolerance. Use Value: 2% output tolerance (−4.8 V to −5.2 V) ensures valid logic thresholds and timing margins in high-speed digital backplanes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC7905CD2TR4G | ±2% output tolerance (−4.8 V to −5.2 V), same D2PAK package, but rated for 0°C to +125°C operating range instead of −40°C to +125°C | Suitable for commercial/industrial ambient conditions only; not qualified for extended cold-start automotive use | Select when cost sensitivity outweighs extended temperature requirement and system ambient stays above 0°C |
| LM7905CT | TO-220 package, ±4% output tolerance (−4.75 V to −5.25 V), higher thermal resistance (65°C/W vs. 5.0°C/W case-to-junction) | Requires larger heatsink for 1 A operation; less suitable for space-constrained SMT layouts | Choose for through-hole assembly or legacy board compatibility where D2PAK footprint is unavailable |
Compared with MC7905CD2TR4G and LM7905CT, the MC7905BD2TR4 offers wider temperature qualification (−40°C to +125°C) and tighter initial tolerance (±2%), making it preferable for automotive and outdoor industrial deployments where thermal margin and precision are critical.
Availability
MC7905BD2TR4 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and precision instrumentation requiring stable component supply with long lifecycle support.
Supply support for MC7905BD2TR4 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 supplier specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC7900 series was designed specifically to complement the MC7800 positive regulators, delivering rugged, drop-in negative voltage regulation for dual-rail analog and mixed-signal systems-especially where thermal resilience and fault tolerance are mandatory.
FAQ
What is the maximum input voltage rating for the MC7905BD2TR4?
The MC7905BD2TR4 supports a maximum input voltage of −35 V DC for output voltages between −5.0 V and −18 V, and −40 V DC for −24 V output variants. For the MC7905BD2TR4 specifically (−5.0 V output), the absolute maximum input is −35 V. Exceeding this risks permanent damage due to junction breakdown.
Does the MC7905BD2TR4 require input and output capacitors for stable operation?
Yes-the MC7905BD2TR4 requires a minimum 0.33 µF input capacitor (tantalum or low-ESR ceramic) placed close to pins 1 and 2, and a 1.0 µF output capacitor (tantalum preferred) across pins 1 and 3. These stabilize loop response and suppress high-frequency oscillation, especially under dynamic load changes.
Can the MC7905BD2TR4 be used in parallel to increase output current?
No-MC7905BD2TR4 devices are not designed for parallel operation. Minor output voltage mismatches cause current hogging and thermal runaway. To deliver >1.0 A, use the MC7905BD2TR4 with an external pass transistor in a current-boost configuration, as shown in Figure 9 of the datasheet.
What is the thermal performance of the MC7905BD2TR4 when mounted on a 2 oz. copper PCB pad?
When soldered to a 25 mm × 25 mm 2 oz. copper pad on a single-layer PCB, the MC7905BD2TR4 achieves approximately 40°C/W junction-to-ambient thermal resistance. This allows ~15 W power dissipation at +50°C ambient before reaching the +150°C thermal shutdown threshold-sufficient for 1.0 A at 10 V differential.
Is the MC7905BD2TR4 pin-compatible with other MC7900-series regulators in D2PAK packages?
Yes-all MC7900-series D2PAK variants (e.g., MC7912BD2TR4G, MC7915BD2TR4G) share identical pinout (GND–VI–VO), footprint, and thermal pad connection. Only the output voltage and temperature grade differ-enabling direct substitution in layout when adjusting rail voltage requirements.
MC7905BD2TR4 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:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-3
MC7905BD2TR4 FAQ
1.How can I place an order for MC7905BD2TR4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7905BD2TR4 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 MC7905BD2TR4 reliable?
The price and inventory of MC7905BD2TR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7905BD2TR4 is usually 5 days.
3.What payment methods are accepted for MC7905BD2TR4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7905BD2TR4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7905BD2TR4?
MC7905BD2TR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7905BD2TR4 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 MC7905BD2TR4?
For technical support, including MC7905BD2TR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7905BD2TR4 requirements.
6.How does Aetrix verify that MC7905BD2TR4 is sourced from the original manufacturer or authorized distributors?
All MC7905BD2TR4 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 MC7905BD2TR4 meets industry standards.
7.What is the process for return or replacement of MC7905BD2TR4?
All MC7905BD2TR4 units undergo pre-shipment inspection (PSI). If there is an issue with MC7905BD2TR4, 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 MC7905BD2TR4 part is unused and in its original packaging.
Return procedure for MC7905BD2TR4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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