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onsemi CS8122YT5
- Part No.:
- CS8122YT5
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
CS8122YT5.pdf
- Description:
- IC REG LDO LIN 750MA 5V TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,378
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Product details
Overview
CS8122YT5 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 programmable 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 subsystems.
For engineers reviewing the CS8122YT5 datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, exact pin functions, real-world application mappings, and validated alternative options for automotive-grade 5 V supply design and RESET timing integration.
Technical Context
The CS8122YT5 integrates a bandgap-referenced error amplifier, anti-saturation current-limiting stage, and dual hysteresis comparators for RESET and delay functions - enabling reliable reset assertion down to 1.0 V output and noise-immune delay timing independent of input voltage. Its latching discharge circuit fully discharges the external delay capacitor upon any brief fault, ensuring deterministic RESET pulse generation.
It features a pre-regulator bias supply, overvoltage shutdown at 32–40 V, reverse polarity protection to −50 V transient, and internally limited power dissipation with RJA = 50 °C/W (TO-220). The open-collector RESET output meets CMOS/TTL logic thresholds with 150–250 mV hysteresis and <0.4 V low-state voltage under 3 kΩ load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±2.0% (4.9–5.1 V) - ensures stable microcontroller core supply within automotive grade tolerance. |
| 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 multi-rail 5 V loads including MCU, CAN transceivers, and sensor interfaces. |
| RESET Threshold | VRT(ON) = 4.65–4.90 V, VRT(OFF) = 4.50–4.70 V - provides 150–250 mV hysteresis to prevent chatter during brownout recovery. |
| Delay Time | 16–48 ms with 0.1 µF capacitor - allows configurable power-up sequencing and fault hold-off without firmware dependency. |
| Fault Protection | −50 V reverse transient, +60 V load dump, short-circuit (1.2 A typ), thermal shutdown - meets ISO 7637-2 pulse 5a/b and automotive reliability requirements. |
| Ripple Rejection | 54–75 dB @ 120 Hz - suppresses alternator ripple and switching noise in vehicle electrical systems. |
Pinout & Package
CS8122YT5 is housed in a 5-lead TO-220 package (Case 314D) with copper tab for heatsink attachment. The tab is electrically connected to Pin 3 (GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Unregulated input supply | Accepts −0.5 V to 26 V DC; withstands −50 V reverse and +60 V load dump transients. |
| 2 - VOUT | Regulated 5.0 V output | Delivers up to 750 mA; requires ≥10 µF output capacitor with ESR ≥ 0.1 Ω for stability. |
| 3 - GND | Ground reference and thermal path | Common return for all circuits; copper tab connects here for heatsinking. |
| 4 - Delay | Timing capacitor charge/discharge node | Sources 5–15 µA to CDELAY; sinks current to discharge capacitor when VOUT drops below VRT(OFF). |
| 5 - RESET | Open-collector reset output | Active-low CMOS/TTL-compatible signal; pulls low when VOUT < 4.65 V and remains low for programmed delay. |
Key Features
| Feature | Design Value |
|---|---|
| Externally programmable RESET delay | Enables precise power-up sequencing (16–48 ms) using one capacitor - eliminates need for external timer IC or firmware delay loops. |
| Dual hysteresis comparators | 200–800 mV delay hysteresis and 150–250 mV RESET hysteresis - prevents false triggering from noise or slow-rising VOUT. |
| Latching delay capacitor discharge | Ensures full discharge after any fault event - guarantees consistent RESET pulse width regardless of fault duration. |
| Automotive-grade transient protection | Rated for −50 V reverse battery and +60 V load dump per ISO 7637-2 - reduces need for external TVS diodes in 12 V/24 V systems. |
| Thermal and short-circuit protection | Shuts down at 150–210 °C junction temperature and limits current to 1.2 A typical - prevents damage during sustained overload or heatsink failure. |
Applications
| Engine Control Unit (ECU) Power Supply | Body Control Module (BCM) Reset Management |
|---|---|
Use Scenario: Provides regulated 5 V rail for MCU, EEPROM, and analog sensors in engine bay environments subject to wide temperature swings and load dump transients. IC Role / Device Role / Timing Role: Primary LDO regulator with integrated RESET generator - replaces discrete 5 V regulator + external reset IC + RC timing network. Use Value: Reduces BOM count by 3 components; maintains RESET assertion during 100 ms load dump events due to 1.0 V functional minimum. | Use Scenario: Powers door lock controllers, lighting drivers, and LIN transceivers in vehicle body electronics with strict power sequencing requirements. IC Role / Device Role / Timing Role: System supervisor IC - generates clean, glitch-free RESET signal with user-defined delay to coordinate boot order across multiple submodules. Use Value: Eliminates risk of race conditions during cold crank (low VIN); delay capacitor value sets exact reset hold time without firmware intervention. |
| Industrial PLC I/O Power | Telematics Control Unit (TCU) Backup Supply |
Use Scenario: Supplies isolated 5 V to digital I/O buffers and optocouplers in DIN-rail mounted programmable logic controllers exposed to 24 V DC industrial bus noise. IC Role / Device Role / Timing Role: Fault-tolerant local regulator - handles reverse polarity connection errors and sustains regulation during 40 V surges. Use Value: Withstands −30 V DC reverse polarity and −50 V transients without latch-up; enables "plug-and-play" field installation safety. | Use Scenario: Maintains 5 V supply to GPS module and cellular modem during main battery disconnect or deep discharge in vehicle telematics units. IC Role / Device Role / Timing Role: Secondary supervisor - asserts RESET to halt modem operations when VOUT falls below 4.65 V, preventing corrupted data writes during brownout. Use Value: 150 mV RESET hysteresis prevents oscillation during gradual battery recovery; latching discharge ensures single, clean reset pulse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5 V automotive LDO with RESET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70750PDQNR | Lower IQ (25 µA vs. 2–100 mA), no RESET delay programming, fixed 200 ms RESET timeout, 300 mA output. | Not suitable for high-current or programmable-delay use cases; lacks load dump/−50 V reverse protection. | Select only for low-power, space-constrained modules where 750 mA and automotive transients are not required. |
| MAX6465XR37+T | Fixed 3.7 V RESET threshold, no external delay adjustment, 120 mA output, no reverse polarity or load dump rating. | Designed for general-purpose microprocessor monitoring, not automotive power regulation. | Use only in non-automotive embedded systems requiring simple voltage monitoring without regulation capability. |
Compared with CS8122YT5, TLV70750PDQNR trades 750 mA output and programmable delay for ultra-low quiescent current, while MAX6465XR37+T offers basic reset supervision but no regulation or automotive-grade protection - making CS8122YT5 uniquely suited for 5 V power + RESET co-location in harsh environments.
Availability
CS8122YT5 is available at Aetrix Electronics and suitable for automotive ECU power supplies, industrial PLC I/O modules, telematics control units, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CS8122YT5 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, with leadership in automotive, industrial, cloud, and IoT markets.
The CS8122YT5 belongs to onsemi's SMART REGULATOR® family - engineered specifically for automotive power management with integrated protection, precise reset timing, and ruggedized packaging for under-hood deployment.
FAQ
What is the minimum input voltage required for CS8122YT5 to maintain 5.0 V regulation at 750 mA?
The CS8122YT5 requires VIN ≥ VOUT + Dropout. At 750 mA, dropout is not explicitly specified, but at 500 mA it is 0.6 V typ. Extrapolating conservatively from Figure 8 (Dropout vs. Output Current), dropout reaches ~0.75 V at 750 mA. Thus, minimum VIN is ~5.75 V. This ensures regulation during cold-crank conditions where battery voltage dips to 6–7 V.
Can CS8122YT5 operate with an output capacitor smaller than 10 µF?
No - the datasheet mandates a minimum 10 µF output capacitor (COUT) with ESR ≥ 0.1 Ω for loop stability, as shown in Figure 11 and confirmed in Application Notes. Using smaller values or ceramic capacitors with near-zero ESR risks oscillation, especially at low temperatures or high load transients. Stability testing per Figure 13 is required if deviating from recommendations.
Does CS8122YT5 require an input capacitor, and if so, what value is recommended?
Yes - an input capacitor (CIN) is required if the CS8122YT5 is located more than a few inches from the main power filter, per Figure 13. A 100 nF ceramic capacitor is recommended to suppress high-frequency noise and improve transient response. It is not optional in distributed power architectures or noisy environments like automotive harnesses.
How does the latching discharge circuit in CS8122YT5 improve system reliability compared to non-latching designs?
The latching discharge circuit in CS8122YT5 forces full discharge of the delay capacitor whenever VOUT falls below VRT(OFF), even for sub-millisecond faults. This guarantees that every fault triggers a full-duration RESET pulse - unlike non-latching designs where residual charge could shorten or skip the reset, risking inconsistent MCU initialization or memory corruption in automotive ECUs.
Is the copper tab on the CS8122YT5 TO-220 package electrically isolated or connected to a specific pin?
The copper tab on the CS8122YT5 TO-220 package (Case 314D) is electrically connected to Pin 3 (GND), as confirmed in the "PACKAGE LEAD DESCRIPTION" section (page 4) and thermal data table (page 10). It must be insulated from heatsinks unless the heatsink is grounded; direct mounting without isolation risks shorting GND to chassis.
CS8122YT5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- -
- Output Type:
- -
- Number of Regulators:
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- -
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
CS8122YT5 FAQ
1.How can I place an order for CS8122YT5 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS8122YT5 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 CS8122YT5 reliable?
The price and inventory of CS8122YT5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS8122YT5 is usually 5 days.
3.What payment methods are accepted for CS8122YT5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS8122YT5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS8122YT5?
CS8122YT5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS8122YT5 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 CS8122YT5?
For technical support, including CS8122YT5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS8122YT5 requirements.
6.How does Aetrix verify that CS8122YT5 is sourced from the original manufacturer or authorized distributors?
All CS8122YT5 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 CS8122YT5 meets industry standards.
7.What is the process for return or replacement of CS8122YT5?
All CS8122YT5 units undergo pre-shipment inspection (PSI). If there is an issue with CS8122YT5, 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 CS8122YT5 part is unused and in its original packaging.
Return procedure for CS8122YT5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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