LM134D STMicroelectronics Integrated Circuit (Small Outline Packages) In Stock
LM134D is a three-terminal adjustable current source IC by STMicroelectronics, capable of sourcing 1 µA to 10 mA with a supply voltage range of 1 V to 40 V. Key specs: 10 mA maximum output current, single function, 8-lead SOIC (Pb-free) package. From competitive pricing, in stock with worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LM134D Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Adjustable output current from 1 µA to 10 mA set by a single external resistor, enabling precise current control without op-amp or transistor biasing circuits
- Wide supply voltage range of 1 V to 40 V makes LM134D compatible with low-voltage logic rails and high-voltage analog supply rails alike
- Two-terminal current source behavior (VSET and R pins) simplifies LED biasing, sensor excitation, and reference current generation in compact designs
- Pb-free, RoHS-compliant 8-lead SOIC (R-PDSO-G8) package meets global environmental regulations for consumer and industrial applications
Applications
LM134D is widely used for precision LED current biasing, photodiode and sensor excitation circuits, and temperature measurement bridges where a stable, adjustable current source from 1 µA to 10 mA improves measurement accuracy. Its 1 V to 40 V supply range makes it suitable for industrial 4-20 mA transmitter reference stages and precision analog instrumentation where supply voltage varies. The simple single-resistor programming interface reduces design complexity in test and measurement equipment, medical sensors, and mixed-signal analog front ends.
Specifications
| Pbfree Code | Yes |
| Additional Feature | CURRENT ADJUSTABLE FROM 1MICRO AMP TO 10 MILLI AMP |
| Analog IC - Other Type | DC-DC CURRENT SOURCE MODULE |
| Input Voltage-Max | 40V |
| Input Voltage-Min | 1V |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Output Current-Max | 0.01A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temperature Grade | MILITARY |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Trim/Adjustable Output | YES |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for LM134D:
suggested
suggested
suggested
Frequently Asked Questions
How is the output current of LM134D programmed and what resistor value sets a 1 mA output?
LM134D output current is set by a single external resistor connected between the R and V- terminals. The programming equation is approximately I_out = 67.7 mV / R_set at 25°C. To set 1 mA output, R_set = 67.7 Ω (use 68 Ω standard value for approximately 0.996 mA). For 10 µA, use 6.77 kΩ (standard 6.8 kΩ). This single-resistor simplicity reduces BOM count compared to op-amp current-source topologies requiring 4-6 components.
Can LM134D source current in circuits powered by a 3.3 V microcontroller rail?
Yes. LM134D requires only 1 V minimum supply voltage, comfortably within a 3.3 V rail. At 3.3 V supply, it can source up to its 10 mA maximum output current as long as the voltage across the load resistor plus the minimum device headroom (roughly 1 V) stays within 3.3 V. For example, driving a 200 Ω load at 1 mA requires 1.2 V across LM134D plus 0.2 V across the load, totaling 1.4 V — feasible on a 3.3 V rail.
How does LM134D perform as a temperature sensor and what is its temperature coefficient?
LM134D output current has a positive temperature coefficient of approximately +0.336%/°C (PTAT — proportional to absolute temperature), which means the current increases predictably with temperature. This property allows LM134D to serve as a temperature transducer by measuring the change in output current, with sensitivity of roughly 1 µA/°C when biased at around 298 µA at 25°C. The PTAT characteristic is exploited in Kelvin-scale temperature measurement circuits accurate to within ±1°C over -40°C to +85°C with proper calibration.
For a 4-20 mA industrial transmitter loop, would LM134D be a suitable current source reference?
LM134D is suitable as a precision reference current source within a 4-20 mA transmitter design, though its 10 mA maximum output is only sufficient to drive the upper portion of the 20 mA span. In a typical implementation, LM134D provides a stable 1 µA to 10 mA reference that biases a pass transistor or current mirror, which then amplifies to the 4-20 mA range. Its 40 V maximum supply rating comfortably handles the 12-36 V loop supply common in industrial 2-wire transmitter installations.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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