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onsemi CS8126-2GTHA5
- Part No.:
- CS8126-2GTHA5
- Manufacturer:
- onsemi
- Package:
- -
- Datasheet:
-
CS8126-2GTHA5.pdf
- Description:
- IC REG LINEAR FIXED LDO REG
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Inventory:1,019
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Product details
Overview
CS8126-2GTHA5 from ON Semiconductor is a 5V, 750mA low dropout linear regulator with integrated delayed RESET function, reverse battery protection (±50V/60V), thermal shutdown, and short-circuit current limiting. It delivers 3% output accuracy, 0.6V dropout at 0.5A, and operates across -40°C to +125°C ambient for automotive power rail conditioning.
For engineers reviewing the CS8126-2GTHA5 datasheet, pinout, applications, or equivalent options, key selection criteria include its programmable RESET delay (via external capacitor), open-collector RESET output, VOUT(SENSE) capability in SOIC variants, and TO-220 horizontal mounting compatibility for thermally demanding chassis-grounded installations.
Technical Context
The CS8126-2GTHA5 implements a PNP-based LDO architecture with anti-saturation control and internal bandgap reference, enabling stable 5V regulation down to 1V output during fault recovery. Its dual comparator system features hysteresis on both RESET and DELAY thresholds (200–250mV and 200–800mV respectively) for noise immunity.
RESET assertion is triggered by output undervoltage (VRT(OFF) = 4.50–4.70V), overvoltage shutdown (>32V), thermal overload (>150°C), or short circuit - all independently monitored. The latching discharge circuit fully discharges the external delay capacitor to ≤0.5V even during sub-millisecond faults, ensuring deterministic RESET pulse generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.00 V ±3% - ensures microcontroller I/O and analog subsystems receive compliant supply under full load and temperature. |
| Dropout Voltage | 0.60 V max at 500 mA - enables operation with VIN as low as 5.6V while maintaining regulation, critical for cold-crank automotive scenarios. |
| RESET Threshold | 4.65–4.90 V (ON), 4.50–4.70 V (OFF) - provides 150–250 mV hysteresis to prevent chatter during brownout recovery. |
| Delay Time | 16–48 ms with 0.1 µF capacitor - configurable reset hold-off prevents spurious MCU resets during transient input dips. |
| Transient Protection | +60 V / −50 V peak - withstands ISO 7637-2 Pulse 5a load dump and reverse battery connection without external clamping. |
| Thermal Shutdown | 150–210 °C junction - self-protects during sustained overload or inadequate heatsinking in enclosed enclosures. |
| Quiescent Current | 55–100 mA at 500 mA load - balances low-noise regulation with power efficiency in always-on vehicle modules. |
Pinout & Package
CS8126-2GTHA5 uses a 5-lead TO-220 package with horizontal lead orientation and tab connected to GND. The tab serves as thermal path and electrical ground reference, requiring insulated mounting when chassis-grounded.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Unregulated Input Supply | Accepts 6–26 V DC input; withstands +60 V / −50 V transients per ISO 7637-2. |
| 2 RESET | Open-Collector Reset Output | Sinks current when asserted; requires external pull-up; compatible with CMOS/TTL logic inputs. |
| 3 Gnd | Ground Reference | Common return for bias, regulation, and RESET; electrically tied to metal tab. |
| 4 Delay | Timing Capacitor Interface | Sources charge current (5–15 µA) and sinks discharge current to control RESET delay timing. |
| 5 VOUT | Regulated 5 V Output | Delivers up to 750 mA; supports remote sensing only in SOIC variant (not applicable to CS8126-2GTHA5). |
Key Features
| Feature | Design Value |
|---|---|
| Reverse Battery Protection | Withstands −30 V continuous and −80 V transient input without damage or latch-up. |
| Latching Delay Discharge | Forces full capacitor discharge to ≤0.5 V during any fault, guaranteeing minimum RESET pulse width. |
| High-Frequency Ripple Rejection | 54–75 dB at 120 Hz - suppresses alternator ripple and switching noise from adjacent DC/DC converters. |
| Overvoltage Shutdown | Triggers at 32–40 V input - protects downstream 5 V circuitry during load-dump events. |
| Current Limit | 0.75–1.20 A foldback - limits fault energy during short circuits while minimizing thermal stress. |
Applications
| Body Control Module (BCM) | Engine Control Unit (ECU) Power Sequencing |
|---|---|
Use Scenario: Regulating 5 V supply for microcontroller, CAN transceivers, and sensor interfaces in automotive body electronics exposed to battery transients. IC Role / Device Role / Timing Role: Primary 5 V LDO with RESET supervision; monitors VOUT and asserts RESET during cold-crank undervoltage or load-dump overvoltage. Use Value: Eliminates need for external reset supervisor IC and discrete transient protection, reducing BOM count and PCB area. | Use Scenario: Providing controlled 5 V power to ECU microcontroller core and peripherals during engine start-stop cycles. IC Role / Device Role / Timing Role: Regulator with programmable RESET delay ensures CPU remains held in reset until stable 5 V is established post-cranking. Use Value: Prevents firmware corruption by guaranteeing ≥16 ms RESET assertion during input voltage recovery from 4.2 V to 5.0 V. |
| Telematics Control Unit (TCU) | Advanced Driver Assistance Systems (ADAS) Camera Module |
Use Scenario: Powering GPS/GNSS receiver, cellular modem, and MCU in always-connected vehicle telematics units. IC Role / Device Role / Timing Role: High-reliability 5 V regulator with reverse polarity and thermal protection for unattended 24/7 operation. Use Value: Survives reverse battery jump-start attempts and maintains functional safety integrity without field returns. | Use Scenario: Supplying image sensor and ISP in rear-view or surround-view camera modules mounted near bumpers. IC Role / Device Role / Timing Role: Local 5 V regulator with robust transient immunity against ESD and load-dump coupling through short harness runs. Use Value: Enables direct connection to vehicle battery without additional TVS diodes or filtering, simplifying front-end design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5V automotive LDO with RESET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLE4260G | Pin-compatible 5V LDO with RESET; lower current rating (400 mA), no VOUT(SENSE), identical TO-220 package. | Lacks latching delay discharge; RESET pulse width depends on external RC time constant without guaranteed minimum. | Select when cost sensitivity outweighs need for deterministic fault-response timing. |
| LM2926DT | 5V, 750 mA LDO with RESET; higher quiescent current (12 mA typ), no reverse battery protection, SOIC-8 package. | Requires external TVS for ±60 V transient suppression; unsuitable for direct battery connection without added protection. | Select for space-constrained non-automotive industrial applications where chassis grounding is not required. |
Compared with TLE4260G and LM2926DT, the CS8126-2GTHA5 uniquely combines 750 mA output, integrated reverse-battery tolerance, latching delay discharge, and TO-220 horizontal thermal mounting - making it the only option qualified for direct battery-fed, high-reliability automotive modules requiring guaranteed RESET timing and thermal robustness.
Availability
CS8126-2GTHA5 is available at Aetrix Electronics and suitable for automotive body control, engine management, and telematics applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for CS8126-2GTHA5 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
ON Semiconductor (now part of onsemi) is a global semiconductor supplier specializing in automotive, industrial, cloud, and IoT power management and signal processing solutions.
The CS8126-2GTHA5 belongs to the CS81xx family of automotive-grade linear regulators designed specifically for harsh-environment 12 V battery-fed systems requiring high transient immunity, precise reset supervision, and extended temperature operation.
FAQ
What is the maximum input voltage the CS8126-2GTHA5 can withstand without damage?
The CS8126-2GTHA5 supports a peak transient voltage rating of +60 V and −50 V per ISO 7637-2 Pulse 5a, meaning it can survive automotive load-dump events and reverse battery connections without external protection components. Its absolute maximum continuous input voltage is 26 V, and overvoltage shutdown activates between 32 V and 40 V to protect downstream circuitry. This makes CS8126-2GTHA5 suitable for direct connection to vehicle battery rails in demanding automotive environments.
Does the CS8126-2GTHA5 support remote voltage sensing for improved load regulation?
No, the CS8126-2GTHA5 does not support remote voltage sensing. Remote sense (VOUT(SENSE)) is only available on the 16-lead SOIC wide variant (CS8126YDW16), not on the 5-lead TO-220 packages like CS8126-2GTHA5. For CS8126-2GTHA5, regulation is based solely on the voltage at Pin 5 (VOUT), so PCB layout must minimize trace resistance between the regulator output and load to maintain 3% output accuracy under full 750 mA load.
How is the RESET delay time set on the CS8126-2GTHA5, and what capacitor value yields ~32 ms?
The RESET delay time on CS8126-2GTHA5 is set using an external capacitor connected between Pin 4 (Delay) and ground. With a 0.1 µF capacitor, the typical delay is 32 ms (range 16–48 ms). The formula is Delay time (ms) ≈ CDelay × 3.2 × 10⁵, where CDelay is in farads. For example, a 0.047 µF capacitor yields ~15 ms, while 0.22 µF yields ~70 ms. The CS8126-2GTHA5's latching discharge circuit ensures full capacitor reset even during brief faults, guaranteeing consistent timing behavior.
Is the CS8126-2GTHA5 pin-compatible with the LM2926, and can it be used as a drop-in replacement?
The CS8126-2GTHA5 is documented as lead-compatible with the LM2926, but it is not a drop-in replacement due to pin function differences: CS8126-2 assigns Pin 2 to RESET and Pin 5 to VOUT, whereas LM2926 uses Pin 2 for VOUT and Pin 5 for RESET. Swapping them without board revision will invert RESET logic and disconnect regulated output. Therefore, CS8126-2GTHA5 requires PCB layout adaptation despite shared TO-220 footprint and similar electrical specs.
What thermal performance can be expected from the CS8126-2GTHA5 in a standard TO-220 horizontal mount without a heatsink?
In its specified 5-lead TO-220 horizontal (GTHA) package, the CS8126-2GTHA5 has a typical junction-to-ambient thermal resistance (RΘJA) of 50°C/W. At 750 mA output with 14 V input, power dissipation is ~6.75 W; this would raise junction temperature by ~338°C above ambient - exceeding the 150°C limit. Thus, a heatsink or copper pour is mandatory. With a 10°C/W heatsink and thermal interface, junction rise drops to ~70°C, enabling reliable operation at full load and 85°C ambient. The CS8126-2GTHA5's GND-tab mounting enhances thermal transfer when properly heatsinked.
CS8126-2GTHA5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -
- Supplier Device Package:
- -
CS8126-2GTHA5 FAQ
1.How can I place an order for CS8126-2GTHA5 through Aetrix?
Please submit a Request for Quotation (RFQ) for CS8126-2GTHA5 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 CS8126-2GTHA5 reliable?
The price and inventory of CS8126-2GTHA5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CS8126-2GTHA5 is usually 5 days.
3.What payment methods are accepted for CS8126-2GTHA5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CS8126-2GTHA5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CS8126-2GTHA5?
CS8126-2GTHA5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CS8126-2GTHA5 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 CS8126-2GTHA5?
For technical support, including CS8126-2GTHA5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CS8126-2GTHA5 requirements.
6.How does Aetrix verify that CS8126-2GTHA5 is sourced from the original manufacturer or authorized distributors?
All CS8126-2GTHA5 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 CS8126-2GTHA5 meets industry standards.
7.What is the process for return or replacement of CS8126-2GTHA5?
All CS8126-2GTHA5 units undergo pre-shipment inspection (PSI). If there is an issue with CS8126-2GTHA5, 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 CS8126-2GTHA5 part is unused and in its original packaging.
Return procedure for CS8126-2GTHA5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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