Differential transistor pair: Supply Voltage Range ±5V to ±18V

Component Specifications

Definition

A differential transistor pair consists of two matched bipolar junction transistors (BJTs) or field-effect transistors (FETs) configured symmetrically with their emitters or sources connected to a common current source. This configuration forms the core of differential input stages in operational amplifiers, comparators, and other analog circuits, providing high common-mode rejection ratio (CMRR), low offset voltage, and temperature stability through inherent thermal coupling.

Working Principle

The differential pair operates by converting a differential input voltage (difference between two signals) into a differential output current. When identical transistors share a constant tail current, an increase in base-emitter voltage of one transistor decreases the voltage of the other, creating a linear amplification region for small signals. Common-mode signals (identical on both inputs) produce minimal output change due to the shared current source, effectively rejecting noise and interference.

Materials

Silicon (Si) or Gallium Arsenide (GaAs) semiconductor substrates; aluminum or copper interconnects; silicon dioxide (SiO2) insulation; gold bonding wires; ceramic or plastic packaging.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Input Bias Current	10 nA-10 μA
Input Offset Voltage	0.5-5 mV
Supply Voltage Range	±5V to ±18V
Operating Temperature	-40°C to +125°C
Gain Bandwidth Product	1-100 MHz
Common Mode Rejection Ratio (CMRR)	80-120 dB

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, IEC 60747, JEDEC JESD22

Parent Products

This component is used in the following industrial products

Differential Input Stage

The initial amplification stage in a differential receiver that processes the difference between two input signals while rejecting common-mode noise.

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Engineering Analysis

Risks & Mitigation

Thermal runaway if current source fails
Mismatch in transistor parameters causing offset
Electrostatic discharge (ESD) damage during handling
Saturation at high differential input voltages

FMEA Triads

Trigger: Current source failure or imbalance
Failure: Loss of common-mode rejection, increased offset
Mitigation: Implement current mirror stabilization, use precision matched transistors

Trigger: Thermal gradient across transistors
Failure: Increased offset voltage drift
Mitigation: Use monolithic integrated pairs, symmetrical layout, thermal coupling

Trigger: ESD events during assembly
Failure: Gate oxide breakdown (MOSFETs) or junction damage
Mitigation: ESD protection circuits, proper handling procedures

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Transistor matching typically within 1-5% for critical parameters like β and VBE

Test Method

DC parameter testing (offset voltage, bias current), AC analysis (frequency response, CMRR), thermal cycling per JESD22-A104

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Differential transistor pair

Manufacturer profiles associated with Differential transistor pair.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the main advantage of using a differential transistor pair?

The primary advantage is high common-mode rejection ratio (CMRR), which allows amplification of small differential signals while rejecting noise and interference common to both inputs.

Can differential pairs be used with MOSFETs instead of BJTs?

Yes, MOSFET differential pairs are common in CMOS integrated circuits, offering very high input impedance and lower power consumption, though typically with slightly lower transconductance than BJT pairs.

How does temperature affect differential pair performance?

Matched transistors in close proximity exhibit excellent thermal tracking, minimizing drift in offset voltage and bias currents over temperature variations.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Differential transistor pair