Overview
The KA431SAMF2TF is a programmable shunt regulator from onsemi, part of the KA431S, KA431SA, and KA431SL series. This three-terminal adjustable regulator is known for its guaranteed thermal stability over the operating temperature range. It allows the output voltage to be set to any value between approximately 2.5 V (VREF) and 36 V using two external resistors. The device is designed to provide a sharp turn-on characteristic, making it an excellent replacement for zener diodes in many applications.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Reference Input Voltage (VREF) | 2.470 | 2.495 | 2.520 | V |
| Deviation of Reference Input Voltage Over-Temperature (ΔVREF/ΔT) | -4.5 | 17.0 | mV | |
| Reference Input Current (IREF) | -1.5 | 4.0 | μA | |
| Minimum Cathode Current for Regulation (IKA(MIN)) | 0.45 | 1.00 | mA | |
| Off-Stage Cathode Current (IKA(OFF)) | 0.05 | 1.00 | μA | |
| Dynamic Output Impedance (ZKA) | 0.15 | 0.50 | Ω | |
| Cathode Voltage (VKA) | VREF | 36 V | V | |
| Cathode Current (IKA) | 1 | 100 mA | mA | |
| Operating Temperature Range (TOPR) | -25 | 85 °C | °C | |
| Storage Temperature Range (TSTG) | -65 | 150 °C | °C | |
| Junction Temperature (TJ) | 150 °C | °C | ||
| Thermal Resistance Junction-Air (RθJA) | 350 °C/W | °C/W | ||
| Power Dissipation (PD) | 350 mW | mW |
Key Features
- Programmable Output Voltage to 36 V using two external resistors.
- Low Dynamic Output Impedance of 0.2 Ω (Typical).
- Sink Current Capability: 1.0 to 100 mA.
- Equivalent Full-Range Temperature Coefficient of 50 ppm/°C (Typical).
- Temperature Compensated for Operation Over Full Rated Operating Temperature Range.
- Low Output Noise Voltage.
- Fast Turn-on Response.
- Pb-Free and Halogen-Free.
Applications
- Replacement for zener diodes in many applications.
- Shunt Regulator: Can be used to regulate voltage in various circuits.
- Output Control for Three-Terminal Fixed Regulator: Can be configured to control output voltage in fixed regulator applications.
- High Current Shunt Regulator: Suitable for high current shunt regulation needs.
- Current Limit or Current Source: Can be used to limit or source current in circuits.
- Constant-Current Sink: Can be configured as a constant-current sink.
Q & A
- What is the KA431SAMF2TF used for?
The KA431SAMF2TF is a programmable shunt regulator used to regulate voltage in various electronic circuits.
- What is the output voltage range of the KA431SAMF2TF?
The output voltage can be set to any value between approximately 2.5 V (VREF) and 36 V using two external resistors.
- What is the typical dynamic output impedance of the KA431SAMF2TF?
The typical dynamic output impedance is 0.2 Ω.
- What is the sink current capability of the KA431SAMF2TF?
The sink current capability ranges from 1.0 to 100 mA.
- What is the temperature coefficient of the KA431SAMF2TF?
The equivalent full-range temperature coefficient is 50 ppm/°C (Typical).
- Is the KA431SAMF2TF Pb-Free and Halogen-Free?
Yes, the device is Pb-Free and Halogen-Free.
- What is the operating temperature range of the KA431SAMF2TF?
The operating temperature range is -25°C to 85°C.
- What is the storage temperature range of the KA431SAMF2TF?
The storage temperature range is -65°C to 150°C.
- What is the junction temperature limit of the KA431SAMF2TF?
The junction temperature limit is 150°C.
- Can the KA431SAMF2TF be used as a replacement for zener diodes?
Yes, it can be used as a replacement for zener diodes in many applications due to its sharp turn-on characteristic.
