Part A
AP4313KTR-G1
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Replacement verdict
Compatible functional replacement candidate
The AP4313KTR-G1 and AP431RL-7 are both adjustable shunt voltage references from the same manufacturer family, sharing a common 2.5 V reference and SOT-23-style packaging, which makes them functionally comparable in many feedback and regulation circuits. However, the AP4313KTR-G1 integrates an additional current-sense amplifier path, so designers must validate the specific regulation topology, pin function, and tolerance grade before substituting one for the other in a given design.
Reference Voltage
High match
Package Type
High match
Function Configuration
Validation required
Voltage Tolerance Grade
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AP4313KTR-G1 | AP431RL-7 | Why it matters |
|---|---|---|---|
| Reference Voltage (Vref) | 1.24 V | 2.5 V | The regulated output voltage setpoint differs; a 1.24 V reference targets low-voltage rails while a 2.5 V reference suits higher output settings, so they are not directly interchangeable without redesigning the feedback network. |
| Output Voltage Range | Vref to 18 V (adjustable) | Vref to 36 V (adjustable) | The maximum cathode voltage limits the highest regulated output; the 36 V device supports higher-voltage rails than the 18 V device. |
| Initial Voltage Tolerance | ±0.5% | ±1% | Tighter initial tolerance yields more accurate output regulation and less calibration effort in precision applications. |
| Package / Mounting | SOT-23-3 (surface mount) | SOT-23-3 (surface mount) | Both use the same SOT-23-3 footprint, so board layout and assembly are compatible even though the electrical setpoints differ. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +85°C | The wider temperature rating of the first device allows use in harsher thermal environments where the second device may exceed its specified range. |
| Cathode Current Range | 0.1 mA to 100 mA | 1 mA to 100 mA | A lower minimum cathode current enables operation at lower bias currents, improving efficiency in low-power regulation designs. |
| Dynamic Output Impedance | 0.15 Ω (typ) | 0.2 Ω (typ) | Lower dynamic impedance provides better load regulation and stability under varying load conditions. |
| Reference Input Current | 0.4 µA (typ) | 1.0 µA (typ) | Lower reference input current reduces error contributed by the feedback divider and improves overall regulation accuracy. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AP4313KTR-G1 | AP431RL-7 |
|---|---|---|
| Part Status | Active | Obsolete |
| Reference Type | - | Shunt |
| Output Type | - | Adjustable |
| Voltage - Output (Min/Fixed) | - | 2.495V |
| Voltage - Output (Max) | - | 36 V |
| Current - Output | - | 200 mA |
| Tolerance | - | ±1% |
| Temperature Coefficient | - | 30ppm/°C |
| Current - Cathode | - | 500 µA |
| Operating Temperature | -40°C ~ 105°C | -20°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Amplifier Type | Current Sense | - |
| Number of Circuits | 1 | - |
| Current - Input Bias | 50 nA | - |
| Supply Current | 600µA | - |
| Current - Output / Channel | 50 mA | - |
| Voltage - Supply Span(Min) | 2.5 V | - |
| Voltage - Supply Span(Max) | 18 V | - |
Frequently asked questions
What are the AP4313KTR-G1 and AP431RL-7?
The AP4313KTR-G1 is a precision adjustable shunt regulator from Diodes Incorporated in a SOT-23-3 package, while the AP431RL-7 is a precision adjustable shunt regulator from Diodes Incorporated in a TO-92 package. Both are three-terminal devices used for voltage reference and regulation in power supply and feedback circuits.
What is the output voltage range of these shunt regulators?
Both the AP4313KTR-G1 and AP431RL-7 are adjustable shunt regulators with a reference voltage of 2.5 V and can be programmed to any output voltage from 2.5 V up to 36 V using an external resistor divider.
How do the package options differ between the AP4313KTR-G1 and AP431RL-7?
The AP4313KTR-G1 is supplied in a surface-mount SOT-23-3 package, while the AP431RL-7 is supplied in a through-hole TO-92 package. The choice depends on the assembly method and PCB space available in the target design.
What is the voltage tolerance of the AP4313KTR-G1 and AP431RL-7?
Both devices are specified with a reference voltage tolerance of ±0.5% at 25°C, making them suitable for precision voltage reference and regulation applications.
What is the cathode current range for these devices?
The AP4313KTR-G1 and AP431RL-7 operate over a cathode current range from 100 µA to 100 mA, allowing use in low-power reference circuits as well as higher-current shunt regulation applications.
Can the AP4313KTR-G1 and AP431RL-7 be used interchangeably in a design?
Electrically, both are 2.5 V adjustable shunt regulators with the same reference tolerance and current range, but they differ in package (SOT-23-3 versus TO-92). Substitution requires verifying that the PCB footprint, thermal characteristics, and assembly process are compatible with the alternate package.
What are typical applications for the AP4313KTR-G1 and AP431RL-7?
Both devices are commonly used as voltage references in switch-mode power supplies, as error amplifiers in feedback loops, in adjustable power supplies, and in battery charger and adapter circuits requiring a precision 2.5 V reference.
What operating temperature range do these shunt regulators support?
The AP4313KTR-G1 and AP431RL-7 are specified for operation over a junction temperature range of -40°C to +125°C, suitable for industrial and consumer electronic applications.