Current regulating diode Current regulating diodes (CRD hereunder) are diodes that maintain a constant current flow despite voltage fluctuations. CRDs supply constant current over a wide range of voltage from less than 1V to 100V. Constant CRD current is supplied regardless of fluctuations in voltage applied, load resistance changes and ripple voltage. Creating a constant current circuit generally involves multiple components, but with SEMITEC CRDs only one part is required to accomplish the same function. Product number explanation Dimensions S series E series 102 Packing method No marking: Untaped bulk products 26Z: 26 mm width axial taping Z folding Plated electrode 26R: 26 mm width axial taping reel 1.6 Anode 52Z: 52 mm width axial taping Z folding T: S series only SMD reel taping Product number Lot number Pinch-o current 1 E.g.: 301: 30 x 10 A = 0.3 mA 0.13 2 0.9 102: 10 x 10 A = 1.0 mA Cathode mark Cathode 2 Plated 452: 45 x 10 A = 4.5 mA electrode Marking E: Leaded type S: SMD type Cathode ring Unit: mm Applications - Constant current source for LED brightness stabilization - Constant current test equipment for various semiconductor devices - LED street lights, LED fluorescent lamps, LED light bulbs, LED downlights - Telecommunications line interface - Constant voltage circuit for supplying constant current to Zener diodes - Earth leakage circuit breakers - Constant current source for proximity sensors and other sensors - Curr ent source for piezoelectric actuators - Battery charge / discharge circuits - Stabilized power supply circuits - Electrolytic capacitor aging equipment Specifications 1 1 Product number Pinch-off current (10 V) Limiting current Limiting General current ratio Temperature 2 Ip (mA) I /Ip*I / coefficient (% / ) E series S series SMD Leaded Min - max V (V) I (mA) 100V 30V k k typical Ip Rated power 300 mW 500 mW S-101T E-101 0.10 0.05 - 0.21 0.5 + 2.10 to + 0.10 100 V (E-101 to E-562) 100 V (S-101 to S-562) Rated voltage S-301T E-301 0.30 0.20 - 0.4 0.8 + 0.40 to - 0.20 (pulse wave) 50 V (E-822 to E183) 50 V (S-822 to S-223) S-501T E-501 0.50 0.40 - 0.6 1.1 + 0.15 to - 0.25 Allowable reverse 50 mA S-701T E-701 0.70 0.60 - 0.9 1.4 0.00 to - 0.32 current S-102T E-102 1.00 0.88 - 1.3 1.7 - 0.10 to - 0.37 Junction temperature 150 S-152T E-152 1.50 1.28 - 1.7 2.0 1.1 max - 0.13 to - 0.40 Operating - 30 to 150 - 40 to 150 temperature range S-202T E-202 2.00 1.68 - 2.3 2.3 - 0.15 to - 0.42 S-272T E-272 2.70 2.28 - 3.1 2.7 - 0.18 to - 0.45 S-352T E-352 3.50 3.00 - 4.1 3.2 0.8 lpmin. - 0.20 to - 0.47 Recommended maximum voltage S-452T E-452 4.50 3.90 - 5.1 3.7 - 0.22 to - 0.50 Product number Voltage Product number Voltage S-562T E-562 5.60 5.00 - 6.5 4.5 - 0.25 to - 0.53 E-101 to E-562 100 S-101 to S-562 100 S-822T E-822 8.20 6.56 - 9.8 3.1 - 0.25 to - 0.45 E-822 S-103T E-103 10.0 8.00 - 12.4 3.5 - 0.25 to - 0.45 S-123T E-123 12.0 9.60 - 14.4 3.8 - 0.25 to - 0.45 E-103 30 1.0 max (I /Ip) S-822T to S-223T 50 S-153T E-153 15.0 12.0 - 18.0 4.3 30 - 0.25 to - 0.45 E-123 S-183T E-183 18.0 16.0 - 20.0 4.6 - 0.25 to - 0.45 E-153 25 S-223T 22.5 20.0 - 25.0 5.3 - 0.25 to - 0.45 E-183 1 : Pinch-off current and limiting current are measured by pulse wav e at 25 environment temperature 2 : Temperature coefficient is calculated from measurements at 25 and 50 . Taping options Voltage - current characteristics SEMITEC offers both axial and SMD taping. Unit: mm Voltage (V) Axial type Unit: mm I : Pinch-o current at 10 V P Minimum taping quantities V : Voltage which produces 0.8 Ip K 0.1 0.10 0.1 0.05 0.10 0.1 0.1 0.05 + 0.1/-1 0.05 0.1 or greater current Axial type Reel: 5000 pcs V : Breakdown voltage Box: 2500 pcs B SMD element is set with the cathode side on the side with holes. I : Permitted reverse current R SMD type 3000 pcs 22 New Current (mA) 3.5 0.7 2.6 0.45Influence of environment temperature on power and pinch-off current rating How to compensate current reduction due to heat up of the CRD For currents of 1 mA or more resistors can be used together with 100 CRDs to compensate for current decreases and fluctuations. The following values are typical for compensation resistors. Rated power: 500 mW S-223 S-183 10 Product number S-102 S-152 S-202 S-272 S-352 S-452 S-562 S-822 S-103 S-123 S-153 S-183 S-223 S-153 S-123 Recommended S-103 1.1 M 430 k 300 k 200 k 130 k 91 k 62 k 27 k 18 k 15 k 12 k 9 k 5.6 k S-822 resistance value S-562 S-452 Rated power: 300 mW S-352 S-272 Product number E-102 E-152 E-202 E-272 E-352 E-452 E-562 E-822 E-103 E-123 E-153 E-183 S-202 1 Recommended S-152 1 M 390 k 240 k 120 k 82 k 56 k 39 k 20 k 15 k 11 k 9.1 k 7.5 k resistance value S-102 S-701 S-501 S-301 S-101 0.1 Reliability data Item Test conditions Criteria Resistance to 0.01 10 s at 260 (wave soldering) Ip 5% soldering heat -30 0 30 60 90 120 150 Temperature 3 s at 245 More than Solderability Flux material: Rosin 25%, propanol 90% soldered 75% Dry heat 1000 hours at 150 Current - voltage characteristics with and CRD for higher currents Damp heat without resistor (example) 1000 hours at 85 and 85% humidity CRDs can be used in row (CRD S) Example: E-452 to amplify permissable Damp heat 1000 hours at 70 and 90% humidity (CRD E) current. 10 cycles as below: Temperature 1. - 55 for 15 minutes cycle / Ip 5% 2. Room temperature for 15 minutes With thermal shock resistor 3. 150 for 15 minutes (CRD S) 4. Room temperature for 15 minutes Without resistor 5 cycles as below: Temperature 1. - 25 for 30 minutes cycle / 2. Room temperature for 15 minutes thermal shock CRD for higher voltages 3. 150 for 30 minutes (CRD E) 4. Room temperature for 15 minutes Using CRDs in row with Zener diodes allows the use of stable currents at Recommended mounting pad higher voltage values. dimensions (S series only) Dynamic characteristics (voltage - current) 23