Device Model: SPM0404UD5

1. General Overview

• Device Type: Surface-mount Ultrasonic Acoustic Sensor
• Series: SiSonic™ "Mini" Ultrasonic Sensor
• Manufacturer: Knowles Acoustics (a division of Knowles Electronics)
• Primary Applications:Handheld telecommunication devicesPosition sensingPneumatic flow sensing

2. Part Identification

• Part Number: SPM0404UD5
• Manufacturing Location Code:"S" – Suzhou, ChinaNo letter – Itasca, IL, USA"E" – Engineering samples
• Job ID: 7-digit number following location code

3. Environmental Specifications

• Operating Temperature Range: –40°C to +100°C
• Storage Temperature Range: –40°C to +100°C

4. Acoustic & Electrical Specifications

• Test Conditions: +20°C, 60–70% RH
• Frequency Response: Wideband, normalized to 1 kHz with 2.2 µF coupling capacitor
• Response Curve: Refer to datasheet Figure 5 (normalized free-field response)

5. Mechanical Specifications

• Package Type: Surface-mount MEMS microphone
• Dimensions (mm):Length: 4.00 ± 0.10Width: 3.00 ± 0.10Height: 1.30 ± 0.10Acoustic port diameter: ~0.965 mm
• Tolerance: ±0.15 mm (unless otherwise specified)

6. Recommended PCB Land Pattern

• Land Pattern Dimensions (mm):Length: 2.972Width: 2.210Acoustic port clearance: 1.245 mm radius
• Special Note: Avoid touching or covering the acoustic port mesh during assembly

7. Recommended Interface Circuit

• Pinout:Pin 1: OutputPin 2: GroundPin 3: VddPin 4: Gain set (external resistor divider)
• External Gain: Configurable via resistor ratio (–R1/R2)
• Reference Voltage (Vref): Supplied externally

8. Packaging Details

• Tape & Reel: EIA-481 standard
• Reel Dimensions:Outer diameter: 330 mm (13.0")Component pitch: 4.00 mmTape width: 12.0 mm
• Labeling: Applied to both external package and reel

9. Soldering & Assembly Guidelines

• Reflow Profile:Peak temperature: 260°CPreheat: 170–180°CSolder melt time: ~100–120 seconds
• Moisture Sensitivity Level (MSL): Class 2a
• Shelf Life: 12 months in sealed ESD/moisture bag (≤30°C, ≤70% RH)
• Reflow Cycles: Max 3 cycles recommended

10. Handling & Usage Warnings

• Do not:Pull vacuum over the acoustic portBoard wash or use cleaning agents after reflowUse ultrasonic cleaningBrush the board after reflowInsert any object into the acoustic port

11. Reliability Specifications

• Post-Stress Sensitivity Shift: ≤ ±3 dB after reliability testing

12. Document Revision

• Revision: A (Initial Release)
• Release Date: July 20, 2009
• Status: ACTIVE

13. Notes

• Dimensions are for reference only; consult factory for critical tolerances.
• This document is intended for technical guidance only and does not constitute a license or guarantee.
• Supersedes all previous revisions.