This standard specifies the technical requirements, test methods, inspection rules, marking, packaging and storage of avalanche rectifiers for motor vehicles. This standard applies to avalanche rectifiers for motor vehicles with a downward average current of 15A to 50A tube case rating (hereinafter referred to as devices). JB/T 7820-1995 Avalanche rectifiers for motor vehicles and their components ZB series 15A to 50A avalanche rectifiers for motor vehicles JB/T7820-1995 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7820-1995
Avalanche rectifiers and their components for motor vehicles
ZB series 15A to 50A avalanche rectifiers for motor vehicles 1995-11-24 Issued
Ministry of Machinery Industry of the People's Republic of China
Implementation on 1996-07-01
Mechanical Industry Standard of the People's Republic of China
Avalanche rectifiers and their components for motor vehicles
ZB series 15A to 50A avalanche rectifiers for motor vehicles Subject content and scope of application
JB/T7820-1995
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging and storage of avalanche rectifiers for motor vehicles. This standard applies to avalanche rectifiers for motor vehicles with a case rating of 15A to 50A for forward average current (hereinafter referred to as devices). 2 Reference standards
GB4937
GB4938
JB/T6321
JB4159
ZBT35001
3 Technical conditions
3.1 Appearance drawing and dimensions
Mechanical and climatic test methods for discrete semiconductor devices Acceptance and reliability of discrete semiconductor devices
ZQ series 5A to 50A rectifier tubes for motor vehicles
General technical conditions for tropical electrical products
Basic technical conditions for automotive electrical equipment
The appearance drawing and dimensions shall comply with the requirements of Figure 1, Figure 2, Figure 3, Figure 4 and Table 1. L
Figure 1 (Type 1)
(Type M)
Approved by the Ministry of Machinery Industry on 1995-11-24
Figure 2 (Type I)
Figure 4 (Type N)
Implemented on 1996-07-01
Appearance code
Device model
810.2±0.1
Limit value (absolute maximum rating)
Limit value is as specified in Table 2.
Case temperature
Crystal temperature
Maximum equivalent junction temperature
Reverse repetitive voltage
Forward average current
JB/T78201995
Sine wave conduction 180C, resistive load, T. =120℃, or Te=100℃
Forward (non-repetitive) liquid conduction current
Reverse non-repetitive surge current
Te=25C, t=10ms, exponential waveform,
Duty ratio 1%
Value (maximum value)
-40~100
40~120
-40~175
20%IpLAV
JB/T78201995
Figure 5 Derating curve
Note, when the operating junction temperature Tc exceeds T, the device should be used at a reduced rating, but the maximum shall not exceed the H point. 3.3 Electrical characteristics
The electrical characteristics are as specified in Table 3.
Forward peak voltage
Characteristics and conditions
Te=25r
Maximum voltage at peak current of 100A Reverse repetitive peak current
When there is no forward dissipation
V,=14V(Class A)
28V(Class B）
Te:=25c
T,=175℃
ZB25, ZB35, ZB50
-ZB15, ZB20
Minimum
Maximum value
Avalanche breakdown voltage 1
Ig=100mA
Avalanche breakdown voltage 2
Characteristics and conditions
Te=25℃
Pulse width 10ms
JB/T7820—1995
Continued Table 3
Pulse width 80μs, pulse duty cycle 1%, Tc=150℃Igsu=35A(ZB15)
=45A(ZB20)
=60 A(ZB25)
=90 A(ZB35)
=120 A(ZB50)
Thermal resistance\
Note: 1) Corresponds to the data of the appearance in Figure 1.
Characteristic curves (not for inspection)
The following characteristic curves should be given in the product manual: a.
Forward volt-ampere characteristic curve;
Transient thermal impedance and time curve; surge current and frequency curve, tube case temperature and forward average current derating curve; ZB25
maximum forward power dissipation curve and forward average current and conduction angle curve; reverse surge current and reverse pulse duration curve; reverse peak power dissipation curve and reverse pulse duration curve; reverse peak energy and reverse pulse duration curve; single
reverse volt-ampere characteristic curve after breakdown (IRSM and V(BR>1, Vand dynamic resistance); IgsM waveform.
Batch inspection and periodic inspection
Batch inspection
All inspections are non-destructive. USL is the maximum value in Table 3. Each batch of products shall be inspected batch by batch according to Table 4. Number
Minimum value
Maximum value
Grade A Grade B
Inspection items
Appearance inspection and size
Non-operating
Forward peak voltage
Reverse repetitive peak
Breakdown voltage 1
Breakdown voltage 2
Ia Home x :
Veasoi
JB/T7820—1995
Cited standards
According to Figure 1, Figure 2, Figure 3 or
Figure 4JB4159, 2.4.1
Level 1 and 2.4.2, Level 1
JB/T6321 Appendix C1
JB/T6321 Appendix C2
JB/T6321 Appendix C1
JB/T6321 Appendix C2
Appendix C
Appendix D
Te=25C
(Unless otherwise specified)
1 pulse
Inspection requirements
Maximum value
Marking is complete and clear, surface is flat and smooth
Clear, the surface is not blistering, cracking, rust, serious mechanical damage or scratches,
Dimensions meet the requirements of the outline drawing
Polarity reversal>10USL
>10 USL
Conform to Table 3
Conform to Table 3
Conform to Table 3
Note: If the batch inspection fails the first time, it can be resubmitted for re-inspection according to the strict inspection method (AQL strictness level). 4.2 Periodic inspection
AQL(I)
Periodic inspection shall be carried out in accordance with Table 5. For the standardized products in normal production, periodic inspection shall be carried out at least once a year. The weldability test shall be carried out on a batch every three months.
USL=upper limit of specification (see Table 3), marked with (D) are destructive test conditions
Inspection items
Solderability (only applicable to welding end
Rapid temperature change
Followed by:
Sealing of cavity device
Non-cavity device
Steady-state damp heat
Finally tested:
Forward peak voltage
Reverse repetitive peak current
Breakdown voltage 1
Breakdown voltage 2
Referenced standards
Figure 1, 2, 3 or 4 of this standard
GB 4937, 2.2
GB4937, 3.1.1
GB 4937, 3.7.5
GB 4937.3.5
Appendix C1 of JB/T6321
Appendix C2 of JB/T6321
Appendix C
Appendix D
Te=25C
(Unless otherwise specified)
Tinning method:
Solder 230±5℃, immersed in 2±
-40～175℃ for 5 cycles,
Pressurized fluorine oil for leak detection
55C, 500h, relative humidity
90%~98%
Issr one pulse
Maximum value
Conforms to Table 1
No lubrication is good
Full rate ≤0.1
Pa cm'/s
≤1.1USL
≤2USL
≤1.1USL
≤1.1USL
Test items
Electrical durability
Final test:
Forward peak voltage
Reverse repetitive peak current
Forward (non-repetitive) surge current
Final test:
Forward peak voltage
Reverse repetitive peak current
Resistance to soldering heat (only for soldering
connected devices)
Final test:
Forward peak voltage
Reverse repetitive peak current
High temperature storage (D)
Final test:
Forward peak voltage
Reverse repetitive peak current
Reverse non-repetitive wave source current
Final test:bzxz.net
Forward peak image voltage
Reverse repetitive peak current
JB/T7820—1995
Continued Table 5
Cited standards
Te=25℃
(Unless otherwise specified)
GB4938,2.3.2
JB/T6321 Appendix C1
JB/T6321 Appendix C2
JB/T6321 Appendix C3
JB/T6321 Appendix C1
JB/T6321 Appendix C2
JB/T6321 Appendix C4
GB 4937,2. 2. 2
JB/T6321 Appendix C1
JB/T6321 Appendix C2
GB 4937,3. 2
JB/T6321 Appendix C1
JB/T6321 Appendix C2
Appendix D
JB/T6321 Appendix C1
JB/T6321 Appendix C2
Working life 1000h, Tc0.8
Tealg=0.8Iran Usability load
150-1c or 175-c, wave times
number 20 times
Reference point position Center of the bottom of the pipe
Point, point depth 1mm
260-9, immersion 10±1s
Recovery time ≥1h
1000±#h.175-1C
10 pulses
Maximum value
≤2USL
Conform to Table 2
Conform to Table 3
≤1.1USL
Note: If the first submission for periodic inspection fails, additional sampling can be used according to Appendix B for another inspection, but each inspection group can only be added once, and the additional samples should be subject to all inspection items of the group. 4.3 Qualification test
Qualification test is carried out according to Table 4, Table 5 and Table 6. IVD is the initial value of each device. 6
Inspection items
Thermal cycle load test
Final test:
Forward peak voltage
Reverse repetitive peak current
Vibration (D)
Shock (D)
Final test:
Forward peak voltage
Reverse repetitive peak current
Breakdown voltage 1
Breakdown voltage 2
5 Marking
5.1 Marking on the device
Vacom
Model and quality category;
JB/T7820—1995
Cited standards
JB/T6321 Appendix C5
JB/T6321 Appendix C1
JB/T6321 Appendix C2
GB 4937.2.3
ZB T35 001.3. 6.3.7
GB 4937.2.4
Appendix C1 of JB/T6321
Appendix C2 of JB/T6321
Yang Lu C
Appendix D
Te=25c
(unless otherwise specified)
Number of cycles
Connector: 1000
Crimpord: 5000
Temperature 40C~T
On the motor
980/st, lasting 6ms, semi-normal
waveform, three mutually perpendicular
directions impact 3 times, a total of 18 times
Graphic of the diode for terminal identification, with the arrow pointing to the pole terminal or the cathode terminal indicated in red; manufacturer's name, code or trademark;
Inspection batch identification code.
2 Marking of the packaging box (bag) or the attached manual 5.2
Model and quality category (Class 1);
Manufacturer name, code and trademark;
Inspection batch identification code;
Number of this standard;
Moisture-proof and rain-proof markings.
Ordering information
Unless otherwise specified, at least the following information is required to order a device; a.
Accurate model:
Standard number:
Quality category (Class 1);
Others.
Maximum value
JB/T78201995
AQL sampling table
(Supplement)
Sample quantity
Batch range
91-150
151-280
5011200
281-500
3201-10000
1201- 3200
10001—35000
35001-150000
Note: ①This table belongs to general inspection level 1,
②c: qualified judgment number,: unqualified judgment number, then the batch should be inspected by percentage
The arrow indicates that the first sampling plan should be used. If the sample size at the corresponding point of the arrow is equal to or greater than the batch size,?
100% inspection,
Appendix B
Additional sampling table
(Supplement)
Qualified judgment number
Initial sampling
Additional sampling
Additional number
Principle circuit and requirements
JB/T7820-1995
Test method for avalanche breakdown voltage V(R)1
(Supplement)
V(R) adopts pulse Pulse method test, the principle circuit is shown in Figure C1; G
Test conditions
Shell temperature
Reverse current
Test procedure
Tested diode;
Tc=25℃
I=100mA
Temperature adjusted to the specified value.
Calibrated non-inductive resistor;
A constant current pulse or half-sine wave generator. Improve The output of the pulse generator is used to obtain the specified reverse current value, and the breakdown voltage is read by the peak reading meter. Appendix D
Reverse (non-repetitive) surge current Is and reverse (non-repetitive) power dissipation P test method (supplement)
D1 Overview
In addition to the rectification function, the avalanche rectifier for motor vehicles can also withstand a large reverse surge power dissipation within a specified time, that is, withstand a large reverse surge current, absorb pulse energy with a high amplitude, and make the reverse voltage hunt around 40V. This feature is the essential difference between the ZB series of avalanche rectifiers for motor vehicles and the ZQ series of ordinary rectifiers. D2
Verify the relationship curve between the reverse (non-repetitive) surge current rating and the reverse (non-repetitive) surge power dissipation and the surge duration at the highest equivalent junction temperature.
Principle circuit and requirements
Principle circuit||t t||D3.2 Circuit description
G: Adjustable AC voltage (power) source
D: Blocking diode (if necessary)
JB/T7820-1995
R: Current limiting resistor
D,: Electronic switch
C: Variable capacitor for adjusting pulse width
R: Variable resistor for adjusting reverse current Rs: Non-inductive current output resistor
S,: Electromechanical switch or electronic switch for discharging capacitor C M: Instrument for measuring peak avalanche voltage (such as oscilloscope) M2: Instrument for measuring peak reverse current () (such as oscilloscope) M, and M, can be combined (such as a two-line oscilloscope) D3.3 Related requirements
D3.3.1 The reverse current waveform is an exponentially decreasing differential wave. The pulse width is defined as the width corresponding to 50% of the current amplitude, as shown in Figure D2. IgsM
The reverse dissipation power of the rectifier under test is the product of the required breakdown voltage and the corresponding reverse surge current.
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