1 , , Reference Diode Literature Number: SNVS750B. Reference Diode June 2005. Reference Diode General Description 0 C to +70 C temperature range. See the connection dia- grams for available packages. For applications requiring The integrated circuits are see precision shunt regulator diodes. These monolithic IC. voltage references operate as a low temperature coefficient zener with dynamic impedance. A third terminal Features on the allows the reference voltage and tempera- n Adjustable 4V to 6V. ture coefficient to be trimmed easily. n Low temperature coefficient The series is useful as a precision low n Wide operating current of 600 A to 10 mA. voltage reference for digital voltmeters, power supplies or op n dynamic impedance amp circuitry. The makes it convenient to obtain a n 1% initial tolerance available stable reference from low voltage supplies. Further, since n Guaranteed temperature stability the operates as a shunt regulator, it can be used n Easily trimmed for minimum temperature drift as either a positive or negative voltage reference.
2 N Fast turn-on The is rated for operation over 55 C to +125 C n Three lead transistor package while the is rated over a 25 C to +85 C tem- perature range. The is rated for operation over a Connection Diagrams TO-92 SO Package Plastic Package 00571604. Bottom View Order Number or 00571607. See NS Package Number Z03A Order Number or See NS Package Number M08A. TO-46. Metal Can Package 00571605. Bottom View Order Number , , , , , or See NS Package Number H03H. 2005 National Semiconductor Corporation DS005716 Typical Applications Trimmed 4V to 6V Reference with Temperature Coefficient Reference Independent of Breakdown Voltage 00571601. Reference with Minimum Temperature Coefficient 00571603. * Does not affect temperature coefficient 00571615. Adjust to * Any silicon signal diode 2. Absolute Maximum Ratings (Note 1) 0 C to +70 C. If Military/Aerospace specified devices are required, Soldering Information please contact the National Semiconductor Sales Office/ TO-92 Package (10 sec.)
3 260 C. Distributors for availability and specifications. TO-46 Package (10 sec.) 300 C. Reverse Current 15mA SO Package Forward Current 10mA Vapor Phase (60 sec.) 215 C. Storage Temperature 60 C to +150 C Infrared (15 sec.) 220 C. Operating Temperature Range (Note 2). See AN-450 Surface Mounting Methods and Their Effect on 55 C to +150 C. Product Reliability (appendix D) for other methods of sol- 25 C to +85 C dering surface mount devices. Electrical Characteristics (Note 3). Parameter Conditions Units Min Typ Max Min Typ Max Reverse Breakdown Voltage TA=25 C, IR=1 mA. V. , V. Reverse Breakdown Change TA=25 C, 6 12 6 20 mV. With Current 600 A IR 10 mA. Reverse Dynamic Impedance TA=25 C, IR=1 mA, f = 100 Hz 2 . Temperature Stability VR Adjusted (Note 4) IR=1 mA, (Figure 2). 0 C TA 70 C ( ) 4 12 mV. 25 C TA +85 C ( ) 7 18 mV. 55 C TA +125 C ( ) 20 36 mV. Reverse Breakdown Change 600 A IR 10 mA 6 17 6 24 mV. With Current Adjustment Range Circuit of Figure 1 1 1 V.
4 Reverse Dynamic Impedance IR = 1 mA . Long Term Stability TA=25 C C, IR=1 mA, t = 1000 hrs 20 20 ppm Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device beyond its specified operating conditions. Note 2: For elevated temperature operation, Tj max is: LM136 150 C. LM236 125 C. lm336 100 C. Thermal Resistance TO-92 TO-46 SO-8. ja (Junction to Ambient) 180 C/W ( " Leads) 440 C/W 165 C/W. 170 C/W ( ". Leads). ja (Junction to Case) N/A 80 C/W N/A. Note 3: Unless otherwise specified, the is specified from 55 C TA +125 C, the from 25 C TA +85 C and the from 0 C TA +70 C. Note 4: Temperature stability for the lm336 and LM236 family is guaranteed by design. Design limits are guaranteed (but not 100% percent production tested) over the indicated temperature and supply voltage ranges. These limits are not used to calculate outgoing quality levels. Stability is defined as the maximum charge in VREF from 25 C to TA(min) or TA(max).
5 3 Typical Performance Characteristics Reverse Voltage Change Zener Noise Voltage 00571617 00571618. Dynamic Impedance Response Time 00571619 00571620. Reverse Characteristics Temperature Drift 00571621 00571622. 4. Typical Performance Characteristics (Continued). Forward Characteristics 00571623. Application Hints The series voltage references are much easier to use than ordinary zener diodes. Their low impedance and wide operating current range simplify biasing in almost any circuit. Further, either the breakdown voltage or the tempera- ture coefficient can be adjusted to optimize circuit perfor- mance. Figure 1 shows an with a 10k potentiometer for adjusting the reverse breakdown voltage. With the addition of R1 the breakdown voltage can be adjusted without affect- ing the temperature coefficient of the device. The adjustment range is usually sufficient to adjust for both the initial device tolerance and inaccuracies in buffer circuitry. If minimum temperature coefficient is desired, four diodes can be added in series with the adjustment potentiometer as shown in Figure 2.
6 When the device is adjusted to the temperature coefficient is minimized. Almost any silicon sig- nal diode can be used for this purpose such as a 1N914, 1N4148 or a 1N457. For proper temperature compensation the diodes should be in the same thermal environment as the It is usually sufficient to mount the diodes 00571610. near the on the printed circuit board. The abso- lute resistance of the network is not critical and any value FIGURE 2. Temperature Coefficient Adjustment from 2k to 20k will work. Because of the wide adjustment (Trim Range = Typical). range, fixed resistors should be connected in series with the pot to make pot setting less critical. 00571609. FIGURE 1. with Pot for Adjustment of Breakdown Voltage (Trim Range = Typical). 5 Typical Applications Precision Power Regulator with Low Temperature Coefficient 00571611. * Adjust for across R1. 5V Crowbar 00571612. Adjustable Shunt Regulator 00571613. 6. Typical Applications (Continued). Linear Ohmmeter 00571614.
7 Op Amp with Output Clamped 00571624. 7 Typical Applications (Continued). Bipolar Output Reference 00571625. Square Wave Calibrator 00571626. 10V Buffered Reference 00571627. 8. Typical Applications (Continued). Low Noise Buffered Reference 00571628. Wide Input Range Reference 00571629. 9 Schematic Diagram 00571616. 10. Physical Dimensions inches (millimeters). unless otherwise noted TO-46 Metal Can Package (H). Order Number , , , , or NS Package Number H03H. Small Outline (SO-8) Package Order Number or NS Package Number M08A. 11 Reference Diode Physical Dimensions inches (millimeters) unless otherwise noted (Continued). Plastic Package (Z). Order Number or NS Package Number Z03A. National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at LIFE SUPPORT POLICY.
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