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onsemi CS8122YTHA5G
- Part No.:
- CS8122YTHA5G
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
CS8122YTHA5G.pdf
- Description:
- IC REG LIN 5V 750MA TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,209
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Product details
Overview
CS8122YTHA5G from onsemi is a precision 5.0 V ±2.0% low-dropout linear regulator delivering up to 750 mA output current with 0.6 V dropout at 500 mA, integrated delayed RESET function programmed via external RC network, and robust fault protection including −50 V reverse transient, 60 V load dump, short-circuit (1.2 A typ), and thermal shutdown - deployed in automotive power management and industrial control systems requiring stable 5 V supply under harsh electrical conditions.
For engineers reviewing the CS8122YTHA5G datasheet, pinout, applications, or equivalent options, key selection criteria include its externally programmable RESET delay (16–48 ms with 0.1 µF capacitor), operation down to 1.0 V output for brownout detection, hysteresis-enhanced noise immunity on both RESET and delay comparators, and TO-220-5 horizontal package with copper tab for heatsink attachment.
Technical Context
The CS8122YTHA5G implements a bandgap-referenced error amplifier driving an anti-saturation pass transistor, with separate low-voltage inhibit and reset delay circuits. Its RESET output is open-collector NPN, activated when VOUT falls below 4.65 V (ON threshold) and released only after the delay capacitor charges above 3.50 V (HI threshold), ensuring clean power-on sequencing.
Fault protection is hardware-based and fully integrated: reverse-battery protection handles −30 V DC and −50 V transients; overvoltage shutdown triggers at 32–40 V; thermal shutdown activates at 150–210 °C; and current limiting caps output at 0.75–1.20 A. All protections operate independently of input voltage as long as VOUT ≥ 1.0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±2.0% - ensures stable logic-level supply for microcontrollers and sensors across temperature and load. |
| Dropout Voltage | 0.6 V @ 500 mA - enables operation with VIN as low as 5.6 V while maintaining regulation. |
| Output Current | 750 mA continuous - supports multiple downstream ICs without external boost circuitry. |
| RESET Threshold | VRT(ON) = 4.65 V, VRT(OFF) = 4.50 V - provides 150 mV hysteresis to prevent chatter during brownout recovery. |
| Delay Time | 16–48 ms with 0.1 µF capacitor - configurable reset hold-off for safe system initialization. |
| Input Voltage Range | −0.5 V to 26 V - accommodates automotive battery transients including 60 V load dump. |
| Thermal Shutdown | 150–210 °C - protects die integrity during sustained overload or poor heatsinking. |
Pinout & Package
CS8122YTHA5G is housed in a TO-220-5 horizontal package (Case 314A) with copper tab electrically connected to Pin 3 (GND) and thermally optimized for heatsink mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Unregulated input supply | Accepts −0.5 V to 26 V; withstands −50 V reverse transients and 60 V load dump pulses. |
| 2 - VOUT | Regulated 5.0 V output | Delivers up to 750 mA; maintains regulation down to 1.0 V for brownout detection logic. |
| 3 - GND | Ground reference & thermal tab | Common return path; copper tab serves as primary heat conduction path to heatsink. |
| 4 - Delay | Timing capacitor charge/discharge node | Sources 5–15 µA to charge external capacitor; sinks current to discharge it during fault events. |
| 5 - RESET | Open-collector NPN output | Pulls low when VOUT < 4.65 V; requires external pull-up; CMOS/TTL compatible. |
Key Features
| Feature | Design Value |
|---|---|
| Externally programmable RESET delay | Enables precise power-on reset timing (16–48 ms) using standard RC components - eliminates need for discrete timer ICs. |
| Hysteresis on RESET and delay comparators | 200–250 mV RESET hysteresis and 200–800 mV delay hysteresis suppress false triggering from supply noise or ripple. |
| Latching delay capacitor discharge | Ensures full discharge of timing capacitor during any brief fault, guaranteeing consistent RESET pulse width after recovery. |
| Integrated fault protection suite | Single-package protection against reverse battery (−30 V DC), load dump (+60 V), reverse transients (−50 V), short circuit, and thermal runaway. |
| Low quiescent current | 2.0–7.0 mA across 5–500 mA load range - minimizes standby power loss in always-on automotive modules. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interface circuitry in gasoline/diesel engine management systems exposed to battery transients and temperature extremes. IC Role / Device Role / Timing Role: Primary 5 V supply regulator with fault-robust RESET signaling for MCU boot sequencing and watchdog coordination. Use Value: Maintains regulated output during 60 V load dump events and −50 V reverse battery faults, preventing ECU resets or latch-up during vehicle jump-starts or alternator failures. | Use Scenario: Providing stable 5 V rail to door module controllers, lighting drivers, and LIN transceivers in passenger compartment electronics. IC Role / Device Role / Timing Role: System power supervisor with programmable RESET delay to coordinate power-up of multi-rail subsystems (e.g., MCU before peripheral drivers). Use Value: External RC-programmable delay ensures lights or windows initialize only after all internal supplies stabilize, eliminating erratic actuator behavior during cold cranking. |
| Industrial PLC I/O Module | Telematics Control Unit (TCU) |
Use Scenario: Regulating 5 V for isolated digital I/O conditioning, ADC references, and communication interfaces in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Fault-tolerant local regulator with brownout detection and latched RESET to halt I/O updates during undervoltage conditions. Use Value: Operates reliably down to VOUT = 1.0 V, enabling accurate low-voltage detection before system shutdown - critical for safe process termination in factory automation. | Use Scenario: Supplying 5 V to GPS receiver, cellular modem, and secure boot controller in vehicle telematics units requiring high reliability and tamper-resistant power sequencing. IC Role / Device Role / Timing Role: Smart regulator with hysteresis-enhanced RESET for secure firmware validation and cryptographic module enablement. Use Value: 150 mV RESET hysteresis prevents spurious reboots during RF-induced supply noise, ensuring uninterrupted GNSS lock and OTA update integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5 V LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2940CT-5.0/NOPB | Fixed 5.0 V output, ±5% tolerance, no RESET function, 0.5 V dropout @ 250 mA, no reverse-battery protection. | Lacks programmable RESET, lower accuracy, and reduced fault coverage - suitable only for benign environments without load dump or reverse polarity risk. | Select LM2940CT-5.0/NOPB only for cost-sensitive non-automotive applications where RESET timing and transient protection are not required. |
| TPS7B6750QDDARQ1 | Automotive-grade 5 V LDO with integrated RESET (fixed 200 ms delay), ±1% accuracy, 0.35 V dropout @ 250 mA, AEC-Q100 qualified, no external delay programming. | Offers tighter accuracy and qualification but fixed delay - cannot be tuned for custom boot sequences; lacks CS8122YTHA5G's −50 V reverse transient rating. | Choose TPS7B6750QDDARQ1 for AEC-Q100-compliant designs needing guaranteed qualification and simpler layout, but use CS8122YTHA5G when field-programmable delay and extreme reverse transient immunity are mandatory. |
Compared with LM2940CT-5.0/NOPB and TPS7B6750QDDARQ1, the CS8122YTHA5G uniquely combines field-adjustable RESET timing, 2.0% output accuracy, and −50 V reverse transient capability - making it the only option among the three for legacy automotive platforms requiring design flexibility and maximum fault resilience without qualification overhead.
Availability
CS8122YTHA5G is available at Aetrix Electronics and suitable for automotive power management, industrial control systems, and telematics modules requiring stable component supply under wide-input-voltage and high-transient conditions.
Supply support for CS8122YTHA5G 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 focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The CS8122YTHA5G belongs to onsemi's SMART REGULATOR® family - engineered specifically for automotive and industrial power systems demanding high reliability, integrated fault protection, and programmable supervision functions in harsh electrical environments.
FAQ
What is the minimum output voltage required for the CS8122YTHA5G RESET function to operate?
The CS8122YTHA5G RESET function remains operational as long as the output voltage stays at or above 1.0 V. Below this level, the internal comparators and latching discharge circuit cease functioning, and RESET behavior becomes undefined. This 1.0 V minimum enables reliable brownout detection well before complete system collapse, supporting graceful shutdown in automotive and industrial applications where CS8122YTHA5G is commonly deployed.
Does the CS8122YTHA5G require an external pull-up resistor on the RESET pin?
Yes, the CS8122YTHA5G RESET pin is an open-collector NPN output and requires an external pull-up resistor to VOUT (or another valid logic supply) to generate a high-level signal. The datasheet specifies test conditions using a 4.7 kΩ resistor to VCC. Selecting the correct pull-up value balances rise time, power consumption, and noise immunity - typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and speed requirements in the target CS8122YTHA5G application.
Can the CS8122YTHA5G be used without a heatsink?
The CS8122YTHA5G can operate without an external heatsink only under light load and low ambient temperature conditions. With a typical RJA of 50 °C/W and maximum junction temperature of 150 °C, power dissipation must remain below ~1.4 W at 25 °C ambient. At full 750 mA output with 12 V input, PD ≈ (12 − 5) × 0.75 = 5.25 W - far exceeding safe limits without heatsinking. Therefore, the copper tab (Pin 3) must be attached to a heatsink for continuous operation above ~200 mA in most real-world CS8122YTHA5G deployments.
What is the purpose of the Delay pin (Pin 4) on the CS8122YTHA5G?
The Delay pin (Pin 4) on the CS8122YTHA5G serves as the bidirectional timing node for the programmable RESET delay function: it sources 5–15 µA to charge an external capacitor during normal operation, and actively sinks current to rapidly discharge that capacitor whenever VOUT drops below 4.50 V. This latching discharge mechanism ensures the RESET pulse width is consistently determined by the RC time constant - even after brief faults - making the CS8122YTHA5G highly predictable in safety-critical automotive and industrial power sequencing.
How does the CS8122YTHA5G handle reverse battery connection?
The CS8122YTHA5G incorporates dedicated reverse-battery protection that blocks current flow and prevents damage when VIN is connected with negative polarity. It withstands −30 V DC reverse input with 10 Ω load and −50 V transient reverse spikes (1.0% duty cycle, <100 ms). During reverse connection, the internal protection circuit clamps VIN to approximately −0.6 V relative to GND, safeguarding downstream circuitry. This feature is integral to the CS8122YTHA5G design and requires no external components - a key differentiator versus basic LDOs lacking such protection.
CS8122YTHA5G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 500mA
- Current - Output:
- 750mA
- Current - Quiescent (Iq):
- 70 mA
- Current - Supply (Max):
- 100 mA
- PSRR:
- 75dB (120Hz)
- Control Features:
- Reset
- Protection Features:
- Over Temperature, Over Voltage, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5 Horizontal
CS8122YTHA5G FAQ
1.How can I place an order for CS8122YTHA5G through Aetrix?
Please submit a Request for Quotation (RFQ) for CS8122YTHA5G 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 CS8122YTHA5G reliable?
The price and inventory of CS8122YTHA5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS8122YTHA5G is usually 5 days.
3.What payment methods are accepted for CS8122YTHA5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS8122YTHA5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS8122YTHA5G?
CS8122YTHA5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS8122YTHA5G 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 CS8122YTHA5G?
For technical support, including CS8122YTHA5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS8122YTHA5G requirements.
6.How does Aetrix verify that CS8122YTHA5G is sourced from the original manufacturer or authorized distributors?
All CS8122YTHA5G 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 CS8122YTHA5G meets industry standards.
7.What is the process for return or replacement of CS8122YTHA5G?
All CS8122YTHA5G units undergo pre-shipment inspection (PSI). If there is an issue with CS8122YTHA5G, 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 CS8122YTHA5G part is unused and in its original packaging.
Return procedure for CS8122YTHA5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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