PR2-1R3-JBW
High-Energy Surge Resistor – 2 W / 1.3 Ω / 5 %
RCD Components “PR Series”

1. Ordering & Construction• Full Part Number: PR2-1R3-JBW• Series: PR2 (2 W base rating)• Resistance Code: 1R3 = 1.3 Ω• Tolerance: J = ±5 % (standard)• Termination Finish: W = Pb-free matte-tin, RoHS-compliant (no “Q” Sn-Pb)• Package: Axial leaded, bulk (no taping/reel suffix)• Lead-wire diameter: 0.039" (1 mm) standard (option PR2-20 gives 0.8 mm)• Body length × diameter: 0.875" ±0.062" (22.2 mm ±1.6 mm) × 0.312" ±0.040" (7.92 mm ±1 mm)• Minimum lead length: 1.375" (35 mm) – options Opt-56 (1.5") or Opt-70 (2") available
2. Electrical Ratings• Continuous power: 2 W (derate 1.25 %/°C above 70 °C)• Option-B power: 5 W (with special coating & heatsink mounting)• Maximum continuous voltage: 750 V (limited by √(P×R) = 39 V on 1.3 Ω, but absolute device ceiling is 750 V)• Peak pulse voltage: 15 kV (device limit; actual allowable pulse depends on energy, waveform & repetition)• Energy surge capability: up to 200 J (value, width & duty dependent – see R-42 derating chart)• Short-time overload: ±0.5 % ΔR typical, 5× rated power 5 s• Voltage coefficient: ±0.005 %/V• Temperature coefficient (TCR): ±100 ppm/°C standard (±20 ppm or ±50 ppm available on request)
3. Pulse & Surge Performance• PR2 family curve: 100 J @ 10 Ω, 10 J @ 100 Ω, 1 J @ 1 kΩ (guide only)• For 1.3 Ω estimate ≈ 50–70 J with 30 % safety margin recommended for single pulse; 50 % margin for repetitive pulses• Meets UL-1449, ANSI/IEEE C62.41, IEC 664, Bellcore TR-NWT-001089, FCC Part 68, etc. when properly derated
4. Environmental / Reliability• Operating temperature: –55 °C to +150 °C (275 °C coating available)• Dielectric withstanding voltage: 1 kV (body to lead, 500 V for PR1/8 & PR1/4)• Moisture resistance: ±1 % ΔR• Temperature cycling: ±0.5 % ΔR• Load life (1000 h @ rated power): ±0.5 % ΔR std, ±1 % Option-B• Shock & vibration: ±0.2 % ΔR• Solder effect: ±0.2 % ΔR
5. Optional Enhancements (add suffix when ordering)• Opt.X: Non-inductive winding (0.3 µH max for PR2) – derate surge 30 %• Opt.F: Flame-proof coating• Opt.B: 5 W power rating (heatsink required)• Opt.ER: Group A screening per MIL-R-39008 RCR style• Opt.75: 50 % of Opt.X inductance• Opt.76: 33 % of Opt.X inductance• Custom marking, burn-in, cut & form, tape & reel (add “T” suffix)
6. Part Number Builder (example)PR 2 – 1R3 – J B W│ │ │ │ └─> Termination: W = Pb-free│ │ │ └──> Option: B = 5 W, F = flameproof, X = non-inductive …│ │ └────> Tolerance: J = 5 % (F = 1 %, G = 2 %, K = 10 %)│ └────────> Resistance: 1R3 = 1.3 Ω (3-significant-digit code for 1 %, 2-digit for 2–10 %)└──────────> Type: PR2 = 2 W surge resistor
7. Applications• Lightning & surge protection• Snubber & RC crowbar circuits• In-rush / pre-charge resistors (PFC, HV DC link)• Medical defibrillator, HV power supplies, laser capacitor dump• Replacing carbon-composition resistors without drift or moisture issues
8. Handling & Mounting Notes• Maintain 0.25" (6.4 mm) lead length inside board for rated power• For 5 W Option-B mount on heatsink with thermal compound; keep Tbody ≤ 150 °C• 30 % (single pulse) or 50 % (repetitive) energy derating advised—verify under worst-case temperature, altitude & humidity• Pb-free solder profile: 260 °C peak, 10 s max