标准时钟振荡器 SG-210STF 25.0000MY: SMD XTAL OSC MHZ 50PPM -40 105C BULK - CUT TAPE
SG-210STF 25.0000MY
Epson Timing
1:
¥17.289
2,189 库存量
Mouser 零件编号
732-SG-210STF25MY
Epson Timing
标准时钟振荡器 SG-210STF 25.0000MY: SMD XTAL OSC MHZ 50PPM -40 105C BULK - CUT TAPE
2,189 库存量
备用包装
1
¥17.289
10
¥14.9725
25
¥13.56
100
¥13.0741
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
25 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 105 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Bulk
标准时钟振荡器 25MHz 50ppm -40C +85C
SG-210STF 25.0000ML3
Epson Timing
1:
¥19.6846
8,571 库存量
Mouser 零件编号
732-SG210STF25.0L3
Epson Timing
标准时钟振荡器 25MHz 50ppm -40C +85C
8,571 库存量
备用包装
1
¥19.6846
10
¥17.1195
25
¥15.5488
100
¥14.8934
250
¥12.9046
500
¥12.5769
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
25 MHz
50 PPM
15 pF
1.6 V
3.6 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Reel, Cut Tape, MouseReel
标准时钟振荡器 SG-210STF 24.5760MS3: SMD XTAL OSC MHZ 25PPM -20 70C 250TR
SG-210STF 24.5760MS3
Epson Timing
1:
¥20.3513
371 库存量
Mouser 零件编号
732-SG-210STF24.5760
Epson Timing
标准时钟振荡器 SG-210STF 24.5760MS3: SMD XTAL OSC MHZ 25PPM -20 70C 250TR
371 库存量
1
¥20.3513
10
¥17.6958
25
¥16.046
100
¥15.3906
250
¥14.4753
500
查看
500
¥13.56
1,000
¥13.0741
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
24.576 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 20 C
+ 70 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Reel, Cut Tape
标准时钟振荡器 SG-210STF 27.0000ML5: SMD XTAL OSC MHZ +/-50PPM -40 85C 3K TR
Epson Timing SG-210STF 27.0000ML5
SG-210STF 27.0000ML5
Epson Timing
1:
¥6.3732
2,985 库存量
Mouser 零件编号
732-SG-210STF27ML5
Epson Timing
标准时钟振荡器 SG-210STF 27.0000ML5: SMD XTAL OSC MHZ +/-50PPM -40 85C 3K TR
2,985 库存量
1
¥6.3732
10
¥5.4127
25
¥5.0285
100
¥4.6782
3,000
¥3.7855
6,000
查看
250
¥4.4296
500
¥4.2375
1,000
¥4.0567
6,000
¥3.6273
购买
最低: 1
倍数: 1
详细信息
- 40 C
+ 85 C
SG-210STF
Reel, Cut Tape
标准时钟振荡器 SG-210STF 33.3333ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
SG-210STF 33.3333ML
Epson Timing
1:
¥19.6846
217 库存量
Mouser 零件编号
732-SG-210F33.3333ML
Epson Timing
标准时钟振荡器 SG-210STF 33.3333ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
217 库存量
备用包装
1
¥19.6846
10
¥15.7974
25
¥14.8934
100
¥13.7295
250
查看
250
¥12.9046
500
¥12.8255
2,500
¥12.5769
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
33.3333 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Bulk
标准时钟振荡器 SG-210STF 10.0000ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
SG-210STF 10.0000ML
Epson Timing
1:
¥19.6846
119 库存量
Mouser 零件编号
732-SG-210STF10.0000
Epson Timing
标准时钟振荡器 SG-210STF 10.0000ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
119 库存量
备用包装
1
¥19.6846
10
¥17.0404
25
¥15.4697
100
¥15.3002
250
查看
250
¥13.6504
500
¥13.3227
1,000
¥12.8255
2,500
¥12.5769
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
10 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Bulk
标准时钟振荡器 SG-210STF 12.2880ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
SG-210STF 12.2880ML
Epson Timing
1:
¥16.7127
213 库存量
Mouser 零件编号
732-SG-210STF12.28ML
Epson Timing
标准时钟振荡器 SG-210STF 12.2880ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
213 库存量
备用包装
1
¥16.7127
10
¥14.4753
25
¥13.1532
100
¥12.5769
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
12.288 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Bulk
标准时钟振荡器 SG-210STF 12.0000ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
SG-210STF 12.0000ML
Epson Timing
1:
¥19.6846
346 库存量
Mouser 零件编号
732-SG-210STF12ML
Epson Timing
标准时钟振荡器 SG-210STF 12.0000ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
346 库存量
备用包装
1
¥19.6846
10
¥15.7974
25
¥14.8934
100
¥13.7295
250
查看
250
¥13.2323
1,000
¥12.9046
2,500
¥12.5769
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
12 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Bulk
标准时钟振荡器 SG-210STF 12.0000ML0: SMD XTAL OSC MHZ +/-50PPM -40 85C 1K TR
SG-210STF 12.0000ML0
Epson Timing
1:
¥6.0342
16 库存量
1,000 预期 2026/3/23
Mouser 零件编号
732-SG-210STF12ML0
Epson Timing
标准时钟振荡器 SG-210STF 12.0000ML0: SMD XTAL OSC MHZ +/-50PPM -40 85C 1K TR
16 库存量
1,000 预期 2026/3/23
备用包装
1
¥6.0342
10
¥5.1641
25
¥4.8929
100
¥4.4522
1,000
¥3.2544
2,000
查看
250
¥4.2149
500
¥4.0115
2,000
¥3.0736
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
- 40 C
+ 85 C
SG-210STF
Reel, Cut Tape
标准时钟振荡器 SG-210STF 16.0000ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
SG-210STF 16.0000ML
Epson Timing
1:
¥19.6846
248 库存量
Mouser 零件编号
732-SG-210STF16.0000
Epson Timing
标准时钟振荡器 SG-210STF 16.0000ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
248 库存量
备用包装
1
¥19.6846
10
¥15.7974
25
¥14.8934
100
¥13.7295
250
查看
250
¥13.2323
1,000
¥12.5769
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
16 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Bulk
标准时钟振荡器 SG-210STF 20.0000ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
SG-210STF 20.0000ML
Epson Timing
1:
¥20.5999
81 库存量
210 预期 2026/6/8
Mouser 零件编号
732-SG-210STF20ML
Epson Timing
标准时钟振荡器 SG-210STF 20.0000ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
81 库存量
210 预期 2026/6/8
1
¥20.5999
10
¥17.7862
25
¥16.8709
100
¥14.1476
250
查看
250
¥13.3227
500
¥13.0741
1,000
¥12.5769
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
20 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Bulk
标准时钟振荡器 SG-210STF 20.0000ML0: SMD XTAL OSC MHZ +/-50PPM -40 85C 1K TR
SG-210STF 20.0000ML0
Epson Timing
1:
¥6.0342
226 库存量
1,000 预期 2026/3/2
Mouser 零件编号
732-SG-210STF20ML0
Epson Timing
标准时钟振荡器 SG-210STF 20.0000ML0: SMD XTAL OSC MHZ +/-50PPM -40 85C 1K TR
226 库存量
1,000 预期 2026/3/2
1
¥6.0342
10
¥5.1641
25
¥4.8929
100
¥4.4522
1,000
¥3.5821
2,000
查看
250
¥4.2149
2,000
¥3.5708
5,000
¥3.4126
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
- 40 C
+ 85 C
SG-210STF
Reel, Cut Tape, MouseReel
标准时钟振荡器 SG-210STF 24.5760ML0: SMD XTAL OSC MHZ 50PPM -40 85C 1K TR
SG-210STF 24.5760ML0
Epson Timing
1:
¥5.9551
1,527 库存量
Mouser 零件编号
732-SG-210STF24.57L0
Epson Timing
标准时钟振荡器 SG-210STF 24.5760ML0: SMD XTAL OSC MHZ 50PPM -40 85C 1K TR
1,527 库存量
备用包装
1
¥5.9551
10
¥5.1528
25
¥4.6782
100
¥4.4522
1,000
¥3.8307
2,000
查看
250
¥4.2149
500
¥4.0115
2,000
¥3.5708
5,000
¥3.4691
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
24.576 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Reel, Cut Tape
标准时钟振荡器 SG-210STF 24.5760ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
SG-210STF 24.5760ML
Epson Timing
1:
¥19.6846
6 库存量
Mouser 零件编号
732-SG-210STF24.57ML
Epson Timing
标准时钟振荡器 SG-210STF 24.5760ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
6 库存量
备用包装
1
¥19.6846
10
¥17.0404
25
¥15.4697
100
¥14.803
250
查看
250
¥13.899
500
¥13.4018
1,000
¥12.5769
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
24.576 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Bulk
标准时钟振荡器 SG-210STF 24.0000ML0: SMD XTAL OSC MHZ 50PPM -40 85C 1K TR
SG-210STF 24.0000ML0
Epson Timing
1:
¥6.0342
796 库存量
3,000 预期 2026/6/2
Mouser 零件编号
732-SG-210STF24ML0
Epson Timing
标准时钟振荡器 SG-210STF 24.0000ML0: SMD XTAL OSC MHZ 50PPM -40 85C 1K TR
796 库存量
3,000 预期 2026/6/2
备用包装
1
¥6.0342
10
¥5.1641
25
¥4.8929
100
¥4.4522
1,000
¥3.5708
2,000
查看
250
¥4.2149
500
¥4.0115
2,000
¥3.3448
5,000
¥3.164
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
24 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Reel, Cut Tape, MouseReel
标准时钟振荡器 SG-210STF 24.0000MS: SMD XTAL OSC MHZ 25PPM -20 70C BULK
SG-210STF 24.0000MS
Epson Timing
1:
¥21.4248
10 库存量
Mouser 零件编号
732-SG-210STF24MS
Epson Timing
标准时钟振荡器 SG-210STF 24.0000MS: SMD XTAL OSC MHZ 25PPM -20 70C BULK
10 库存量
备用包装
1
¥21.4248
10
¥18.4416
25
¥17.5376
100
¥15.8765
250
查看
250
¥15.0516
500
¥14.8934
1,000
¥14.5544
2,500
¥14.0572
5,000
¥13.8086
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
24 MHz
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 20 C
+ 70 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Bulk
标准时钟振荡器 25MHz 50ppm Crystal Oscillator SPXO
SG-210STF 25.0000ML5
Epson Timing
1:
¥5.4579
2,291 库存量
Mouser 零件编号
732-SG-210STF25.0ML5
Epson Timing
标准时钟振荡器 25MHz 50ppm Crystal Oscillator SPXO
2,291 库存量
1
¥5.4579
10
¥4.7347
25
¥4.3053
100
¥4.1245
3,000
¥3.1301
6,000
查看
250
¥3.8985
500
¥3.7403
1,000
¥3.3561
6,000
¥3.0171
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
25 MHz
50 PPM
15 pF
1.8 V
3.3 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Reel, Cut Tape, MouseReel
标准时钟振荡器 SG-210STF 25.0000ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
SG-210STF 25.0000ML
Epson Timing
1:
¥19.6846
370 库存量
Mouser 零件编号
732-SG-210STF25ML
Epson Timing
标准时钟振荡器 SG-210STF 25.0000ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
370 库存量
备用包装
1
¥19.6846
10
¥15.7974
25
¥14.8934
100
¥13.7295
250
查看
250
¥13.2323
1,000
¥12.656
2,500
¥12.5769
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
25 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Bulk
标准时钟振荡器 SG-210STF 25.0000ML0: SMD XTAL OSC MHZ 1.6 3.6V +/-50PPM -40 85C 1K TR
SG-210STF 25.0000ML0
Epson Timing
1:
¥5.9551
111 库存量
2,000 预期 2026/3/23
Mouser 零件编号
732-SG-210STF25ML0
Epson Timing
标准时钟振荡器 SG-210STF 25.0000ML0: SMD XTAL OSC MHZ 1.6 3.6V +/-50PPM -40 85C 1K TR
111 库存量
2,000 预期 2026/3/23
备用包装
1
¥5.9551
10
¥5.1641
25
¥4.7121
100
¥4.4522
1,000
¥3.1075
5,000
查看
250
¥4.2149
500
¥4.0115
5,000
¥3.0623
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
- 40 C
+ 85 C
SG-210STF
Reel, Cut Tape, MouseReel
标准时钟振荡器 SG-210STF 25.0000MS0: SMD XTAL OSC MHZ +/-25PPM -20 70C 1K T/R
SG-210STF 25.0000MS0
Epson Timing
1:
¥8.6897
6 库存量
2,000 预期 2026/5/18
Mouser 零件编号
732-SG-210STF25MS0
Epson Timing
标准时钟振荡器 SG-210STF 25.0000MS0: SMD XTAL OSC MHZ +/-25PPM -20 70C 1K T/R
6 库存量
2,000 预期 2026/5/18
备用包装
1
¥8.6897
10
¥7.1981
25
¥6.5314
100
¥6.2602
1,000
¥5.4353
2,000
查看
250
¥5.9212
500
¥5.6726
2,000
¥5.0737
5,000
¥4.8703
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
- 20 C
+ 70 C
SG-210STF
Reel, Cut Tape, MouseReel
标准时钟振荡器 SG-210STF 25.0000MY0: SMD XTAL OSC MHZ 50PPM -40 105C 1K TR
SG-210STF 25.0000MY0
Epson Timing
1:
¥8.2716
536 库存量
Mouser 零件编号
732-SG-210STF25MY0
Epson Timing
标准时钟振荡器 SG-210STF 25.0000MY0: SMD XTAL OSC MHZ 50PPM -40 105C 1K TR
536 库存量
备用包装
1
¥8.2716
10
¥7.1981
25
¥6.5314
100
¥6.2602
1,000
¥5.4353
2,000
查看
250
¥5.9212
500
¥5.6726
2,000
¥5.0737
5,000
¥4.9268
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
25 MHz
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 105 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Reel, Cut Tape
标准时钟振荡器 SG-210STF 26.0000ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
SG-210STF 26.0000ML
Epson Timing
1:
¥19.6846
580 库存量
Mouser 零件编号
732-SG-210STF26ML
Epson Timing
标准时钟振荡器 SG-210STF 26.0000ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
580 库存量
备用包装
1
¥19.6846
10
¥17.0404
25
¥15.4697
100
¥14.803
250
查看
250
¥14.0572
500
¥13.8086
1,000
¥12.8255
2,500
¥12.5769
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
26 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Bulk
标准时钟振荡器 SG-210STF 27.0000ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
SG-210STF 27.0000ML
Epson Timing
1:
¥19.6846
175 库存量
Mouser 零件编号
732-SG-210STF27ML
Epson Timing
标准时钟振荡器 SG-210STF 27.0000ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
175 库存量
备用包装
1
¥19.6846
10
¥17.0404
25
¥15.4697
100
¥14.803
250
查看
250
¥14.0572
500
¥13.4018
1,000
¥12.9046
2,500
¥12.1588
5,000
¥11.8311
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
27 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Bulk
标准时钟振荡器 SG-210STF 27.0000ML0: SMD XTAL OSC MHZ 50PPM -40 85C 1K TR
SG-210STF 27.0000ML0
Epson Timing
1:
¥5.4579
1,922 库存量
Mouser 零件编号
732-SG-210STF27ML0
Epson Timing
标准时钟振荡器 SG-210STF 27.0000ML0: SMD XTAL OSC MHZ 50PPM -40 85C 1K TR
1,922 库存量
备用包装
1
¥5.4579
10
¥4.7347
25
¥4.3053
100
¥4.1245
1,000
¥3.5708
2,000
查看
250
¥3.8985
500
¥3.7403
2,000
¥3.3448
5,000
¥3.2431
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
27 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Reel, Cut Tape
标准时钟振荡器 SG-210STF 33.3300ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
SG-210STF 33.3300ML
Epson Timing
1:
¥19.6846
57 库存量
Mouser 零件编号
732-SG-210STF33.3300
Epson Timing
标准时钟振荡器 SG-210STF 33.3300ML: SMD XTAL OSC MHZ 50PPM -40 85C BULK - CUT TAPE
57 库存量
备用包装
1
¥19.6846
10
¥17.0404
25
¥15.4697
100
¥14.7239
250
查看
250
¥13.8086
500
¥13.4018
1,000
¥12.9046
2,500
¥12.5769
购买
最低: 1
倍数: 1
详细信息
Standard Oscillators
2.5 mm x 2 mm
33.33 MHz
50 PPM
15 pF
1.6 V
3.63 V
CMOS
SMD/SMT
- 40 C
+ 85 C
2.5 mm (0.098 in)
2 mm (0.079 in)
0.8 mm (0.031 in)
SG-210STF
Bulk