Audio transformer: VOOHU WHTT4001 replaces HanRun HR228434 comparison report

1. Introduction to friendly products (HanRun Electronics Company Limited)

The HanRun HR228434 is a 1:1, 4-pin chip audio transformer used for low frequency coupling and isolation around 600 Ω lines. The windings are connected between 1-3 and 6-4 respectively, with an insertion loss limit of 2.0 dB at 1 kHz and a return loss requirement of 10 dB min. at 350 Hz, 1 kHz and 3.5 kHz. When selecting this type of device, the turns ratio is only the starting point. DC resistance, evaluation circuit and PCB terminal position will also affect the boarding result.

2. Introduction to VOOHU alternative products (Suzhou VOOHU Electronic Technology Co., Ltd.)

VOOHU WHTT4001 also uses a 1-3/6-4 four-terminal structure with a turns ratio of 1±2%. At 1 kHz, 1 V, the parallel inductance of the 1-3 winding is 1.7 H min.; the DC resistance on both sides is not exactly the same, 1-3 is 140 Ω max., and 6-4 is 170 Ω max. It can be put into the same round of 600 Ω, 1:1 audio isolation selection for comparison, but everything from the device appearance to the pads must be reviewed, and it cannot be judged to be directly replaced based on the closeness of the parameters.

3. Comparison of core parameters

Look at the electrical specifications and the dimensions directly related to the assembly together. The test methods for insertion loss, return loss and withstand voltage are not exactly the same, and a single number cannot be used to determine the substitution relationship.

Note:

1. Line testing for HR228434 is illustrated with 600 Ω on both sides; insertion loss and return loss for WHTT4001 are described with 6-4 sides connected to 600 Ω. When doing comparison tests, the source impedance, load impedance, drive level and actual line impedance should be aligned.
2. The 1:1 turns ratio, 1.7 H parallel inductance and 1 kHz insertion loss of the two can be used as a starting point for early screening; the 6-4 winding DC resistance of WHTT4001 is 170 Ω max., which is higher than the 140 Ω max. of HR228434. It needs to be judged based on the actual loop resistance margin.
3. The insulation test cannot just look at "1000 V": HR228434 is 1000 Vrms between windings; WHTT4001 is 1000 VAC, 1 mA, 2 sec between P-S. The voltage form, current limit and duration are different and should be reviewed according to the target safety regulations.
4. Both use 1/3, 6/4 four-terminal terminals, but have different long sides. HR228434 comes with a recommended PCB Layout; before importing WHTT4001, the pin positions, pads, forbidden areas and height space stacking should be confirmed, and the sample should be put on the machine.

4. Applicable scenarios

1. 600 Ω Telephone and Voice Line Interfaces: When selecting an isolation link for a landline, modem, or voice gateway, check the line impedance, drive levels, and load network on both sides.
2. Building intercom, access control voice and broadcast front-end: When it comes to low-frequency analog voice links, focus on actual measurement of insertion loss and return loss near 350 Hz, 1 kHz, and 3.5 kHz.
3. Isolated signal interfaces for industrial instrumentation and control equipment: In addition to the 1:1 turns ratio, DC resistance, withstand test conditions and system grounding methods must be included in the same round of evaluation.
4. Existing board repair or localization import: First complete the PCB pad and outline dimension overlay, and then use samples to verify assembly, insulation and actual circuit performance.

5. Frequently Asked Questions (FAQ)

Can WHTT4001 be a direct replacement for HR228434?

No direct conclusion can be drawn. Both are 1:1, four-terminal audio transformers, and the primary inductance and 1 kHz insertion loss are comparable; however, the secondary DC resistance, long side of the shape, pad, and withstand voltage test conditions need to be checked one by one, and the results of the sample onboard shall prevail.

If the turns ratio is the same at 1:1, can the materials be changed directly?

cannot. The turns ratio only shows that the turns ratio is the same, it still depends on the 600 Ω reference conditions, source/load impedance, DC resistance, return loss test method and PCB assembly boundaries.

What items should you focus on first when testing?

It is recommended to first build an evaluation circuit based on the line impedance and peripheral network of the target product, and then check the insertion loss and return loss at 1 kHz and low-frequency endpoints; then verify the insulation requirements, pad placement, and overall machine noise performance.

What needs to be checked for mechanical compatibility?

In addition to the numbers of the four terminals, the outline length, width, height, pin position, pad size, surrounding prohibited area and reflow soldering process must be checked overlays. The recommended PCB Layout of HR228434 cannot be directly applied to WHTT4001.

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