# AHD to NTSC Inline Converter

## Description

Compact automotive inline AHD 720P/1080P camera to NTSC CVBS converter module with 12 V protection, regulated rails, video decode/scale/encode chain, and rugged 4\-pin vehicle camera connectors\.

## Project Details

- **Owner:** autochimp
- **Created:** 6/7/2026
- **Last Updated:** 6/7/2026
- **Visibility:** Public

## Key Components

### D1 — [SMBJ24A](https://flux.ai/cherepanyadima/smbj24a~2b.md)

- Datasheet URL: https://services\.taiwansemi\.com/storage/resources/datasheet/SMBJ%20SERIES\_R2104\.pdf
- Role Details: Input TVS clamp; SMBJ24A library part, consider SMBJ33CA per LM74700\-Q1 datasheet for full 24V jump\-start tolerance
- Manufacturer Name: Taiwan Semiconductor Corporation
- Manufacturer Part Number: SMBJ24A\-TR
- Part Type: TVS
- Role: Protection

**Pins:**
- A [pin 2]
- K [pin 1]

### D2 — [PESD5V0S1BA](https://flux.ai/lcsc/pesd5v0s1ba~qi2k.md)

- Datasheet URL: https://www\.lcsc\.com/datasheet/C2827694\.pdf?spm=wm\.sxq\.inf\.ggs&lcsc\_vid=T1kIXgFeT1NaU1RXQFBbUlUHT1cKU1NXFVBeX1VSTlAxVlNRTlhaXlFRR1ZWXzsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D
- Forward Voltage: 0\.8V
- LCSC Part Number: C2827694
- Role Details: ESD clamp on exposed AHD video input; capacitance must be verified for AHD bandwidth
- Manufacturer Name: TECH PUBLIC\(台舟\)
- Package or Case Code: SOD\-323\_L1\.7\-W1\.3\-LS2\.5\-BI
- Diode Type: TVS Diode
- JLCPCB Part Class: Extended Part
- Part Type: ESD Protection Devices
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: Protection
- Max Reverse Voltage: 5V
- Manufacturer Part Number: PESD5V0S1BA

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### D3 — [PESD5V0S1BA](https://flux.ai/lcsc/pesd5v0s1ba~qi2k.md)

- Role Details: ESD clamp on exposed composite output
- Role: Protection
- Datasheet URL: https://www\.lcsc\.com/datasheet/C2827694\.pdf?spm=wm\.sxq\.inf\.ggs&lcsc\_vid=T1kIXgFeT1NaU1RXQFBbUlUHT1cKU1NXFVBeX1VSTlAxVlNRTlhaXlFRR1ZWXzsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D
- Forward Voltage: 0\.8V
- LCSC Part Number: C2827694
- Manufacturer Name: TECH PUBLIC\(台舟\)
- Package or Case Code: SOD\-323\_L1\.7\-W1\.3\-LS2\.5\-BI
- Diode Type: TVS Diode
- JLCPCB Part Class: Extended Part
- Part Type: ESD Protection Devices
- License: https://creativecommons\.org/licenses/by/4\.0/
- Max Reverse Voltage: 5V
- Manufacturer Part Number: PESD5V0S1BA

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J1 — [54\-00376](https://flux.ai/cherepanyadima/54-00376~5f.md)

- Role Details: M12/circular 4\-pin substitute for aviation\-style camera input: 12V, GND, AHD\_VIDEO\_IN, SHIELD\_REF
- Manufacturer Name: Tensility International Corp
- Part Type: Connector
- Datasheet URL: https://tensility\.s3\.us\-west\-2\.amazonaws\.com/uploads/pdffiles/54\-00376\.pdf
- Role: Input Connector
- Manufacturer Part Number: 54\-00376

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- SHIELD [pin SH]

### J2 — [54\-00376](https://flux.ai/cherepanyadima/54-00376~5f.md)

- Role: Output Connector
- Manufacturer Name: Tensility International Corp
- Part Type: Connector
- Datasheet URL: https://tensility\.s3\.us\-west\-2\.amazonaws\.com/uploads/pdffiles/54\-00376\.pdf
- Role Details: Matching 4\-pin output: 12V pass\-through, GND, CVBS\_NTSC\_OUT, SHIELD\_REF
- Manufacturer Part Number: 54\-00376

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- SHIELD [pin SH]

### Q1 — [DMT6008LFG](https://flux.ai/kicad-part-library/dmt6008lfg~qw.md)

- Role Details: 60V low\-RDS\(on\) pass FET for LM74700\-Q1 reverse polarity stage; verify automotive grade before release
- Role: Protection
- Manufacturer Part Number: DMT6008LFG
- Datasheet URL: https://www\.diodes\.com/assets/Datasheets/DMT6008LFG\.pdf
- Package or Case Code: Diodes\_PowerDI3333\-8

**Pins:**
- D [pin 5]
- G [pin 4]
- S [pin 3]
- S [pin 1]
- S [pin 2]

### TP1 — [Generic Testpoint](https://flux.ai/jharwinbarrozo/generic-testpoint~esx.md)

- Role Details: Bring\-up/test probe for VIN\_12V\_PROT after reverse\-polarity protection
- Testpoint Size: 0\.5
- Package: 1\.0mm
- Role: Sensing \(Shunt\)

**Pins:**
- P1

### TP2 — [Generic Testpoint](https://flux.ai/jharwinbarrozo/generic-testpoint~esx.md)

- Testpoint Size: 0\.5
- Role: Sensing \(Shunt\)
- Package: 1\.0mm
- Role Details: Bring\-up/test probe for 5V buck output

**Pins:**
- P1

### TP3 — [Generic Testpoint](https://flux.ai/jharwinbarrozo/generic-testpoint~esx.md)

- Package: 1\.0mm
- Testpoint Size: 0\.5
- Role: Sensing \(Shunt\)
- Role Details: Bring\-up/test probe for 3V3\_VIDEO LDO output

**Pins:**
- P1

### TP4 — [Generic Testpoint](https://flux.ai/jharwinbarrozo/generic-testpoint~esx.md)

- Testpoint Size: 0\.5
- Role: Sensing \(Shunt\)
- Role Details: Oscilloscope probe point for AC\-coupled AHD\_DECODER\_IN
- Package: 0\.7mm

**Pins:**
- P1

### TP5 — [Generic Testpoint](https://flux.ai/jharwinbarrozo/generic-testpoint~esx.md)

- Role Details: Oscilloscope probe point for NTSC\_DAC\_OUT feeding ADA4430
- Testpoint Size: 0\.5
- Package: 0\.7mm
- Role: Sensing \(Shunt\)

**Pins:**
- P1

### TP6 — [Generic Testpoint](https://flux.ai/jharwinbarrozo/generic-testpoint~esx.md)

- Testpoint Size: 0\.5
- Role Details: Oscilloscope probe point for CVBS\_NTSC\_OUT at connector side of 75Ω source resistor
- Role: Sensing \(Shunt\)
- Package: 0\.7mm

**Pins:**
- P1

### TP7 — [Generic Testpoint](https://flux.ai/jharwinbarrozo/generic-testpoint~esx.md)

- Role Details: Ground reference probe point for bring\-up measurements
- Testpoint Size: 0\.5
- Package: 1\.0mm
- Role: Sensing \(Shunt\)

**Pins:**
- P1

### U1 — [LM74700QDDFRQ1](https://flux.ai/adrian95/lm74700qddfrq1~2rv.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Symbol Style: parametric\-v1
- Datasheet URL: https://www\.ti\.com/lit/ds/symlink/lm74700\-q1\.pdf?ts=1609880384188&ref\_url=https%253A%252F%252Fwww\.ti\.com%252Fstore%252Fti%252Fen%252Fp%252Fproduct%252F%253Fp%253DLM74700QDBVRQ1%2526HQS%253DOCB\-tistore\-invf\-storeinv\-invf\-store\-findchips\-wwe
- Manufacturer Name: Texas Instruments
- Role: Protection
- Part Type: Integrated Circuit
- Role Details: Reverse battery protection controller sized for \~0\.4A converter load plus margin
- Manufacturer Part Number: LM74700QDDFRQ1
- Package or Case Code: SOT65P280X110\-8N

**Pins:**
- ANODE [pin 5]
- CATHODE [pin 8]
- EN [pin 1]
- GATE [pin 6]
- GND [pin 2]
- N\.C\_1 [pin 3]
- N\.C\_2 [pin 7]
- VCAP [pin 4]

### U2 — [MPQ4321GDE\-5\-AEC1\-Z](https://flux.ai/monolithicpower/mpq4321gde-5-aec1-z~1b5.md)

- Manufacturer Name: Monolithic Power Systems
- Role Details: 42V 1A fixed 5V buck; estimated 5V load \<=450mA peak
- Manufacturer Part Number: MPQ4321GDE\-5\-AEC1\-Z
- Product Image Url: https://www\.monolithicpower\.com/pub/media/catalog/product/f/i/fixed\_output\.jpg
- Product Info Url: https://www\.monolithicpower\.com/en/catalog/product/view/id/3945?utm\_source=ultralibrarian&utm\_medium=component\_search&utm\_campaign=listing
- Package or Case Code: QFN\-12\_2X3\_MPQ4321\_MNP
- Role: Regulator
- Datasheet URL: https://www\.monolithicpower\.com/en/documentview/productdocument/index/version/2/document\_type/Datasheet/lang/en/sku/MPQ4321G\-AEC1

**Pins:**
- AGND [pin 6]
- BOOT [pin 3]
- EN [pin 9]
- FB [pin 7]
- FREQ [pin 4]
- PG [pin 8]
- PGND [pin 1]
- PGND [pin 11]
- SW [pin 12]
- VCC [pin 5]
- VIN [pin 10]
- VIN [pin 2]

### U3 — [MPQ20056GG\-33\-AEC1\-P](https://flux.ai/monolithicpower/mpq20056gg-33-aec1-p~i0.md)

- Product Info Url: https://www\.monolithicpower\.com/en/catalog/product/view/id/710?utm\_source=ultralibrarian&utm\_medium=component\_search&utm\_campaign=listing
- Manufacturer Name: Monolithic Power Systems
- Role Details: AEC\-Q100 3\.3V low\-noise LDO for video IC rails; current budget assumes \<=250mA
- Package or Case Code: QFN8\_MPQ20056\_MNP
- Manufacturer Part Number: MPQ20056GG\-33\-AEC1\-P
- Product Image Url: https://www\.monolithicpower\.com/pub/media/catalog/product/M/P/MPQ20056\-AEC1\_710\_1\.jpg
- Datasheet URL: https://www\.monolithicpower\.com/en/documentview/productdocument/index/version/2/document\_type/Datasheet/lang/en/sku/MPQ20056\-AEC1
- Role: Regulator

**Pins:**
- EN [pin 2]
- EPAD [pin 9]
- FB [pin 8]
- GND [pin 1]
- IN [pin 4]
- IN [pin 3]
- NC [pin 7]
- OUT [pin 5]
- OUT [pin 6]

### U6 — [ADA4430\-1WYRTZ\-R7](https://flux.ai/adrian95/ada4430-1wyrtz-r7~5s4.md)

- Manufacturer Part Number: ADA4430\-1WYRTZ\-R7
- Datasheet URL: https://www\.analog\.com/media/en/technical\-documentation/data\-sheets/ADA4430\-1\.pdf
- Part Type: Integrated Circuit
- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: Video Driver
- Manufacturer Name: Analog Devices Inc\.
- Role Details: NTSC/PAL reconstruction filter and cable driver with 75Ω source termination

**Pins:**
- DIS [pin 5]
- GND [pin 2]
- SAG [pin 3]
- VIN [pin 1]
- VOUT [pin 4]
- VS [pin 6]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/autochimp/ahd\-to\-ntsc\-inline\-converter\~if](https://flux.ai/autochimp/ahd-to-ntsc-inline-converter~if).*

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*Generated from [https://flux\.ai/autochimp/ahd\-to\-ntsc\-inline\-converter\~if](https://flux.ai/autochimp/ahd-to-ntsc-inline-converter~if)*