Hammond 804A 125/500 Ohm Hybrid Isolating Audio Transformer
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Create Free Business AccountKey Features
- Isolating, matching or hybrid use; 125/500 (150/600) ohm primary and secondary
- Max. primary D.C. unbalanced current: 0.5 mA
- +15 dBm maximum power level; +/- 0.5 dB from 50 Hz to 15 kHz
- Deep-drawn tin plated steel case with two 6-32 mounting studs and hardware
- Wire leads, 4" minimum length; 1.75" W x 1.25" D x 2.56" H max
- Humbucking construction with balanced split windings
- Electrostatic shield between primary and secondary
- RoHS and REACH compliant
The 804A is a broadcast-quality 800A Series audio transformer for 150/600 ohm class line work. Both windings are rated at a nominal 125/500 ohms (150/600 ohms also listed), and the listed applications are isolating, matching and hybrid circuits, making it a fit for line isolation in studios, installed sound and telephone-interface style hybrid designs.
The primary accepts a maximum D.C. unbalanced current of 0.5 mA. Frequency response is +/- 0.5 dB max. from 50 Hz to 15 kHz, insertion loss is approximately 1 dB, and the maximum power level is +15 dBm with the specified characteristics, or higher with reduced low frequency performance.
Humbucking construction helps reject stray magnetic fields, and balanced split windings on both primary and secondary give circuit versatility; the primary may be used as the secondary and vice versa for impedance matching. An electrostatic shield sits between the primary and secondary windings. It is housed in a deep-drawn steel case with a tin plated finish and fastens with two 6-32 mounting studs, supplied with hardware. Connections are made by wire leads of at least 4" in length. Maximum overall dimensions are 1.75" (44.5 mm) wide x 1.25" (31.8 mm) deep x 2.56" (65 mm) high.
The 804A is RoHS and REACH compliant. Its listed shipping weight is 0.48 lbs (0.22 kg), and it is identified by UNSPSC 39121301.
Ideal For
- 600 ohm line isolation
- Hybrid circuits
- Audio impedance matching
- Broadcast and studio line interfaces
Overview
| Series | 800A Series (Audio Broadcast Quality) |
| Application | Isolating, Matching, Hybrid |
| Product Type | Audio transformer, broadcast quality, with wire leads |
| Short Description | AUDIO TX B-CAST W/ LEADS |
Dimensions
| Overall Dimensions (Max) | 1.75" (44.5 mm) wide x 1.25" (31.8 mm) deep x 2.56" (65 mm) high |
Electrical
| Impedance Note | Below nominal impedance, power capability is lower and the frequency spectrum shifts downward; at higher impedances both shift upward |
| Frequency Response | +/- 0.5 dB max. from 50 Hz to 15 kHz |
| Maximum Power Level | +15 dBm with specified characteristics (higher levels with reduced low frequency performance) |
| Primary Nominal Impedance | *125/500 (150/600) ohms (* electrostatic shield between primary & secondary) |
| Secondary Nominal Impedance | 125/500 (150/600) ohms |
| Max. Primary DC Unbalanced Current | 0.5 mA |
Identifiers
| UPC | 623980607115 |
| UNSPSC | 39121301 |
| Part Number | 804A |
Packaging & Shipping
| Shipping Weight | 0.48 lbs (0.22 kg) |
| Series Shipping Weight (Spec Sheet) | 0.5 lb. (0.2 kg) |
Construction & Finish
| Case | Deep-drawn steel case, tin plated finish |
| Leads | Wire leads, minimum length 4" |
| Mounting | Two 6-32 mounting studs with hardware |
| Windings | Balanced split windings on primary & secondary; primary may be used as secondary and vice versa for impedance matching |
| Construction | Humbucking |
| Electrostatic Shield | Between primary & secondary |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What applications is the 804A listed for?▾
Isolating, matching and hybrid.
What are the 804A impedances?▾
Primary and secondary are each a nominal 125/500 ohms, with 150/600 ohms also listed.
How is the 804A mounted?▾
The 804A has a deep-drawn tin plated steel case with two 6-32 mounting studs, and the mounting hardware is included. Connections are by wire leads with a minimum length of 4".
What is the frequency response of the 804A?▾
Frequency response is +/- 0.5 dB max. from 50 Hz to 15 kHz with approximately 1 dB insertion loss, at up to +15 dBm with the specified characteristics.
What are the dimensions of the 804A?▾
Overall dimensions are 1.75" (44.5 mm) wide x 1.25" (31.8 mm) deep x 2.56" (65 mm) high max.
Is the 804A RoHS compliant?▾
Yes. The 804A is listed as RoHS compliant and REACH compliant.
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