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
What are the key features of LM134D?
- 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
What is LM134D used for?
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.
What are the specifications of LM134D?
| 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 |
Where can I find the LM134D datasheet?
LM134D Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for LM134D?
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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Why Buy from FindMyChip
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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