1.27mm Pin Header — 0.05" Pitch Male PCB Connector for JTAG & High-Density Boards
1.27mm Pin Header — High-Density 0.05" Pitch Male PCB Connectors for JTAG, SWD & Compact Designs
The 1.27mm (0.05") pitch pin header is the standard choice for high-density PCB interconnects, JTAG/SWD/ISP debug headers, and space-critical board-to-board connections where the conventional 2.54mm (0.1") pitch is too coarse. At exactly half the pitch of standard headers, 1.27mm pin headers allow twice the pin density in the same board footprint, making them indispensable for professional embedded systems design, ARM Cortex debug interfaces, and compact industrial control boards.
Key Technical Specifications
- Pitch: 1.27mm (0.05")
- Contact material: Brass, gold-plated (Au flash over Ni)
- Insulator material: Nylon 6T (UL94V-0 flame retardant)
- Current rating: 1A per contact (500V for 1.27mm)
- Contact resistance: ≤20mΩ
- Insulation resistance: ≥1000MΩ min
- Withstand voltage: AC/DC 500V
- Operating temperature: –40°C to +105°C
- Row configuration: Single row (1×N), Double row (2×N)
- Pin count: 2P to 40P (breakaway, cuttable to any length)
- Mounting styles: Straight DIP, Right-Angle DIP, Vertical SMT, Horizontal SMT
- Certifications: CE, RoHS
Complete Product Range in This Collection
This collection includes: single-row 1.27mm pin headers (1×40P breakaway, cuttable to any 2P–40P length), double-row 1.27mm pin headers (2×N configurations from 2×2P to 2×20P), right-angle SMT gold-plated headers for surface-mount reflow assembly, IDC box headers (DC3 style, 2.54mm pitch equivalent for 1.27mm ribbon cable), and JTAG/ISP/SWD debug socket box headers (6P, 10P, 20P, 26P, 34P, 40P) compatible with standard ARM and AVR debug probes.
Ideal Applications
- JTAG / SWD debug headers — ARM Cortex-M, STM32, nRF52, ESP32-S3 programming interfaces
- ISP headers — AVR, PIC, and 8051 in-system programming connectors
- High-density board-to-board stacking connectors in compact embedded systems
- Ribbon cable IDC connectors for flat cable assemblies
- Test point headers on production PCBs for automated test equipment (ATE)
- Compact industrial control boards and PLCs with space constraints
- Wearable electronics and medical device PCBs requiring minimal footprint
1.27mm Pin Header Buying Guide
Step 1 — Single row vs double row: Single-row (1×N) headers are used for simple GPIO breakouts and power rails. Double-row (2×N) headers are standard for JTAG (2×10P = 20P), ISP (2×3P = 6P), and ribbon cable IDC connectors. Confirm your PCB footprint before ordering.
Step 2 — Mounting angle: Straight DIP headers are soldered vertically through the PCB. Right-angle headers exit horizontally, useful for edge-accessible debug ports. SMT headers (vertical or horizontal) are for reflow soldering on surface-mount boards.
Step 3 — Breakaway vs fixed length: Our 1×40P breakaway headers can be snapped or cut to any length from 2P to 40P using flush cutters. Fixed-length headers (e.g., 2×10P JTAG) are also available pre-cut.
Step 4 — Mating connector: 1.27mm pin headers mate with 1.27mm female headers (socket connectors) or IDC ribbon cable connectors. Ensure the mating connector pitch matches exactly — 1.27mm and 2.54mm headers are not interchangeable.
Why Choose Yoeruyo for 1.27mm Pin Headers?
Yoeruyo stocks the complete 1.27mm pin header range — single row, double row, straight, right-angle, and SMT — all with gold-plated contacts (Au flash over 50μ" Ni) for superior corrosion resistance and low contact resistance over thousands of mating cycles. All products are CE and RoHS certified, manufactured to IEC 60603-13 dimensional standards, and available in quantities from 5pcs for prototyping to 1000pcs+ for production runs.
Frequently Asked Questions
Q: What is the difference between 1.27mm and 2.54mm pin headers?
A: 1.27mm pitch (0.05") is exactly half the spacing of standard 2.54mm (0.1") headers. This allows twice the pin density in the same board area. 1.27mm is not compatible with 2.54mm mating connectors — they require matching 1.27mm female headers or IDC connectors.
Q: Are these compatible with standard JTAG and SWD debug probes?
A: Yes. The 2×10P (20-pin) and 2×5P (10-pin) 1.27mm double-row headers are the standard footprint for ARM Cortex JTAG and SWD debug interfaces used by J-Link, ST-Link, CMSIS-DAP, and similar probes.
Q: Can I cut the 1×40P breakaway header to a custom length?
A: Yes. Use flush-cut wire cutters or PCB snips to break or cut the header at any position. Score the insulator between pins and snap cleanly. The gold-plated contacts on cut pins remain fully functional.
Q: What female header mates with 1.27mm pin headers?
A: Our 1.27mm Female Header collection (single and double row, straight and SMT) provides the matching socket connectors. Ensure both the pitch (1.27mm) and row configuration (single/double) match.
Q: Are SMT 1.27mm headers suitable for reflow soldering?
A: Yes. Our SMT (surface-mount) 1.27mm headers are designed for reflow soldering at standard lead-free profiles (peak 260°C). The Nylon 6T insulator is rated to +105°C continuous, with short-term reflow tolerance.
