JP011821UNL 1×1 RJ45 PulseJack with 1CT:1CT 100Base-TX Magnetics
JP011821UNL PulseJack Tab-UP RJ45 with integrated 1:1 magnetics, 100Base-TX, 2250 VDC isolation, LEDs; through-hole mounting.
JP011821UNL RJ45 PulseJack Quick Snapshot
- Part number: JP011821UNL (EOL noted in source listing)
- Form factor: 1×1 side-entry (tab-UP) RJ45 with integrated magnetics (1CT:1CT)
- Primary use: 100Base-TX (Fast Ethernet) NICs, embedded devices, routers/switches needing integrated transformer and status LEDs.
- Isolation rating: 2250 VDC (datasheet) — Hipot 1500 Vrms @60 Hz for 1 min.
- Mounting: Through-Hole (THT) — strong mechanical retention, wave-solder compatible.
- Temp range: 0°C to +70°C (operating).
- RoHS: Yes.
- Status: EOL (source label: EOL - CONN,RJ45,1X1,100D,1:1,TU NPB).
Key Features of 1x1 Tab-UP RJ45 PulseJack
- Integrated true 1CT:1CT magnetics — simplifies BOM and reduces board area compared with discrete magnetics.
- High isolation (2250 VDC spec) for robust line isolation and safety margin.
- Bi-color / dual LEDs (left/right) for link/activity diagnostics (G_O/Y notation indicates green/orange bi-color + yellow).
- EMI fingers provided for better shield grounding when chassis/grounded shield used.
- Designed for 100Base-TX — insertion loss, return loss, and crosstalk optimized around 1–100 MHz.
- Through-hole mounting & UL94V-0 housing for reliability and manufacturability.
Specifications of JP011821UNL 100Base-TX Magjack
| Attribute | Value |
|---|---|
| Part number | JP011821UNL |
| LINK-PP P/N | LPJ2011KONL |
| Data rate | 100Base-TX (Fast Ethernet) |
| Turns ratio | TX 1CT:1 — RX 1CT:1 |
| Isolation voltage | 2250 VDC |
| Hipot | 1500 Vrms @60Hz, 1 min |
| Operating temperature | 0°C to +70°C |
| Mounting style | Through-Hole (THT) |
| Orientation | Tab-UP |
| Channels / Ports | 1×1 |
| LEDs (L/R) | G_O / Y (green/orange bi-color + yellow) |
| EMI fingers | Yes |
| Insertion loss (1–65 MHz, TYP) | −1.0 dB |
| Return loss (1–10 MHz) | −20 dB |
| Return loss (10–30 MHz) | −16 dB |
| Return loss (30–60 MHz) | −12 dB |
| Return loss (60–80 MHz) | −10 dB |
| Crosstalk (1–30 MHz, TYP) | −40 dB |
| Crosstalk (30–60 MHz) | −35 dB |
| Crosstalk (60–100 MHz) | −30 dB |
| Common mode rejection (1–50 MHz) | −30 dB |
| Common mode rejection (50–150 MHz) | −20 dB |
| Shield material & finish | Brass; 10–20 µin Ni over brass |
| Contact material & plating | Phosphor bronze; Ni underplate + selective Au 15 µin |
| Contact solder area finish | Tin, matte |
| Housing material | Thermoplastic, UL94V-0 |
| MSL rating | 1 (lowest sensitivity) |
| RoHS | Yes |
JP011821UNL Datasheet
1. JP011821UNL Datasheet Mechanicals
2. JP011821UNL Datasheet PCB Layout
3. JP011821UNL Datasheet Electrical Schematics
Materials, Compliance and Environmental Specifications
- Shield: Brass with 10–20 µin nickel plating over brass — good conductivity and corrosion protection.
- Contacts: Phosphor bronze with nickel underplate + selective gold (15 µin) on mating area — ensures low contact resistance and durable mating.
- Housing: Thermoplastic rated UL94V-0 for flammability performance.
- Operating temp: 0°C to 70°C — suitable for commercial-grade equipment but not for harsh industrial (-40°C) environments.
- MSL = 1: no special bake required prior to reflow/assembly.
Design & PCB Integration Notes for RJ45 with Magnetics
- Footprint & mechanical: THT pins provide strong mechanical fixation — confirm board cutouts and keep-out for top-entry clearance.
- Shield grounding: Use EMI finger pads and multiple ground vias to PCB ground to fully exploit shield for EMI control. Route a low-impedance path to chassis if needed.
- Magnetics: Internal 1CT:1CT magnetics remove need for external transformers — still verify PHY side matching and common-mode choke requirements for your PHY.
- LEDs: L/R LED pins use bi-color / single color options (G_O/Y). Check pinout for resistor placement or on-board LED drive requirements — some designs include series resistors on board, others expect them external.
- Thermal / wave solder: THT construction tolerates wave solder and standard reflow flows (check manufacturer recommendations).
FAQs About JP011821UNL 100Base-TX RJ45 MagJack
Q1 — Is JP011821UNL shielded?
A: Yes. The product uses a brass shield with nickel plating (10–20 µin Ni over brass) and includes EMI fingers for chassis grounding.
Q2 — Does JP011821UNL include magnetics?
A: Yes. It contains integrated 1CT:1CT magnetics (TX and RX 1CT:1), removing the need for an external LAN transformer for standard 10/100Base-TX designs.
Q3 — What Ethernet speeds does it support?
A: Engineered for 100Base-TX (10/100 Mbps). It’s not specified for Gigabit operation — validate before using at 1000Base-T.
Q4 — What is the isolation / hipot rating?
A: Isolation is specified as 2250 VDC; hipot test listed is 1500 Vrms @60Hz for 1 minute.
Q5 — What LEDs are available and how are they configured?
A: Left/Right LEDs indicated as G_O / Y (green/orange bi-color on one side, yellow on the other). Verify pinout and series resistor placement in your schematic.
Q6 — What is the operating temperature range?
A: 0°C to +70°C (commercial grade).
Q7 — Is this part RoHS compliant and what is the MSL?
A: Yes, RoHS compliant. MSL = 1.
Q8 — Is JP011821UNL still in production?
A: The source notes EOL (end-of-life) on the part listing. If you rely on long production runs, qualify an alternative LPJ2011KONL early.
Q9 — What are the Typical use cases of JP011821UNL Magjack?
A: Embedded boards, NICs, routers, consumer networking gear requiring integrated magnetics and LED indicators.
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