LM394H Texas Instruments Transistor BJT NPN (Other) In Stock
LM394H is a super-matched NPN bipolar transistor pair from Texas Instruments, offering outstanding parameter matching for precision analog circuits. Features extremely low offset voltage, matched hFE within 0.2%, and low noise making it ideal for differential amplifiers. Available worldwide with fast shipping from authorized distributors.
- Manufacturer
- Texas Instruments
- Package
- Other
- Pin Count
- 6
- Lifecycle
- OBSOLETE
- Datasheet
- LM394H Datasheet PDF
- Category
- Transistor BJT NPN
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Super-matched NPN pair with hFE matching within 0.2% for differential circuits
- Extremely low input offset voltage under 100 µV for precision analog applications
- Low noise figure suitable for high-sensitivity preamplifier and sensor interface designs
Applications
The LM394H is used in precision differential amplifier stages where matched transistor characteristics reduce offset errors to under 100 µV. It suits instrumentation front-ends, audio preamplifiers, and low-noise sensor conditioning circuits operating from supply voltages up to 40 V. The metal TO-46 package provides good thermal coupling between the matched pair.
Specifications
| Reach Compliance Code | Unknown |
| YTEOL | 0 |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the hFE matching specification of the LM394H and why does it matter for differential amplifiers?
The LM394H guarantees hFE matching within 0.2% between the two transistors, which directly translates to a collector current mismatch of less than 2 µA at 1 mA bias. This tight matching reduces common-mode error in differential amplifiers to negligible levels without external trimming resistors.
Which supply voltage range can LM394H circuits operate from, and how does this compare to JFET-input op-amp front-ends?
LM394H circuits operate over a supply voltage range up to 40 V, which is broader than many JFET-input op-amps rated at 36 V. The bipolar NPN pair also delivers lower 1/f noise corner frequency below 100 Hz, making it preferable in low-frequency precision designs like strain-gauge bridges and thermocouple amplifiers.
When should a designer choose LM394H over a monolithic precision op-amp for a thermocouple preamplifier?
A designer should choose LM394H when the thermocouple signal source impedance is below 1 kΩ and 1/f noise performance below 10 Hz is critical. The matched NPN pair provides input noise voltage as low as 1 nV/√Hz at 1 kHz, outperforming many rail-to-rail op-amps in this regime while supporting collector currents up to 2 mA per device.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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