# SR554 Stanford Research Amplifier Used

**Features:**

-   Transformer-coupled input
-   0.1 nV/√Hz input noise
-   0.1Hz to 40 kHz bandwidth
-   Gain of 100 or 500
-   Single-ended and differential inputs
-   \>40 dB isolation from DC to 500 MHz
-   Powered by SRS lock-in amplifiers

The SR554 is a low-noise, transformer-coupled preamplifier optimized for source impedances between 0.05 Ohm and 1 kOhm. With an input noise of only 0.1 nV/√Hz, the SR554 can be used in a wide range of low-noise applications. It is the ideal preamplifier for low-temperature, synchronous detection applications where isolation between the experimental sample and the lock-in amplifier is critical.

The SR554 can operate in one of two modes. In the “bypassed” mode, the instrument is simply a passive transformer with a turns ratio of 100, providing an overall voltage gain of 100. In the “non-bypassed” mode, an additional amplifier (gain of 5) is added, increasing the overall gain to 500 and providing a low-impedance (<1 Ohm) output. In the bypassed mode, the SR554 requires no external power. When using the output amplifier, ±20 VDC must be supplied. The preamplifier connector on SRS lock-ins can be used to power the SR554.

## Details

- **Price:** 0.0 USD
- **Vendor:** Stanford Research
- **Type:** Amp Oth
- **Tags:** Amplifier, Manufacturers, Other, Other Equipment, product_manual_group_1, Product_used, Stanford Research

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 0.00 USD | In stock |

## Images

- SR554 Stanford Research Amplifier Used

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> Source: [ValueTronics](https://valuetronics.com/products/sr554-stanford-research-amplifier-used)
> Updated: 2026-05-21