1N6489US-TR - 4.7V 1.5W Zener Diode D-5A | Microchip
MPN: 1N6489US-TR ✓ فعال1N6489US-TR جائزہ
A Zener diode is a specialized PN-junction diode engineered to operate in the reverse-bias breakdown region, where the voltage across the device remains nearly constant over a wide range of current. Zeners are widely used as shunt voltage regulators, voltage references, protection clamps, and waveform clippers across analog, power, and digital systems. In the broader component taxonomy, the 1N6489US-TR sits within discrete semiconductors → diodes → Zener diodes, and is one of the industry-recognized 1N64xx-series 1.5 W regulators from multiple defense-grade qualified vendors.
Key features include 1.5 W maximum power dissipation at 25 °C (derated linearly to 0 W at 200 °C), a nominal Zener voltage of 4.7 V at Izt = 53 mA, maximum Zener impedance of 8 Ω, low reverse leakage of 4 µA at 1 V VR, and a hermetically sealed glass MELF package. Operating junction and storage temperature range is -65 °C to +200 °C, with a thermal resistance suitable for typical PCB-mount thermal designs.
The 1N6489US-TR uses a hermetically sealed glass axial-leaded MELF construction that is mechanically robust and suitable for military and aerospace environments. Its precisely controlled breakdown voltage and tight tolerance make it a preferred choice for reference rails, ADC/DAC references, op-amp supply clamps, and overvoltage protection in sensitive analog front-ends.
Typical applications include precision voltage reference circuits, op-amp supply rail clamping, ADC/DAC reference buffering, overvoltage protection for analog input stages, and shunt regulation in industrial 24 V loop-powered instrumentation. The hermetic MELF construction also supports downhole, avionics, and military field-deployed equipment where reliability under thermal cycling is mandatory.
When designing with this Zener, ensure the working reverse current is well below the test current Izt so that the impedance does not rise excessively, and provide adequate PCB copper to dissipate up to 1.5 W continuous. For tighter tolerance requirements, series-characterize individual devices or consider a precision band-gap reference IC instead.
This page synthesizes distributor pricing, drop-in alternatives in the same D-5A MELF footprint, and practical design considerations that are not collected together in the manufacturer datasheet.
کے لیے ڈراپ اِن متبادل 1N6489US-TR — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں 1N6489US-TR (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Maximum Power Dissipation (Pd), Maximum Zener Impedance (Zzt), Reverse Leakage Current (Ir).
1N6489US
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →JANTX1N6489US
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
CDLL6489
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
1N6489US-e3
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
CDLL6489
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
1N6489US-TR زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Manufacturer | Microchip Technology |
| Product Type | Zener Diode (Voltage Regulator) |
| Nominal Zener Voltage (Vz) | 4.7 V |
| Zener Voltage Tolerance | ±5% |
| Maximum Power Dissipation (Pd) | 1.5 W at 25 °C |
| Maximum Zener Impedance (Zzt) | 8 Ω at Izt |
| Test Current (Izt) | 53 mA (typical) |
| Reverse Leakage Current (Ir) | 4 µA at VR = 1 V |
| پیکیج / کیس | D-5A (SQ-MELF, glass, hermetic) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| آپریٹنگ جنکشن درجہ حرارت | -65 °C to +200 °C |
| Storage Temperature | -65 °C to +200 °C |
| Military Qualification | MIL-PRF-19500/406 |
| Packaging | Tape & Reel (TR) |
1N6489US-TR پن کنفیگریشن
| پن 1 | Cathode — Cathode terminal (Zener reverse-bias operation when biased positive) |
| پن 2 | Anode — Anode terminal (opposite cathode-marked end) |
عام استعمالات
1N6489US-TR کے لیے موزوں ہے 6 ایپلیکیشنs: Precision Voltage Reference Circuit, Op-Amp Supply Rail Clamping, ADC/DAC Reference Buffer Front-End, Overvoltage Protection for Analog Inputs, Shunt Regulation in 24 V Industrial Loops, Military and Aerospace Avionics Power Conditioning.
Precision Voltage Reference Circuit
The 1N6489US-TR delivers a 4.7 V nominal reference suitable for low-noise analog references when biased at Izt = 53 mA. Its 8 Ω maximum Zener impedance minimizes voltage drift versus current, while the hermetic D-5A MELF package eliminates thermal hysteresis typical of plastic Zeners. In a typical shunt reference design, the 1N6489US-TR sits between a current-source resistor and ground, producing a clean 4.7 V rail. Compared with a precision bandgap reference IC, this Zener is more rugged against input overvoltage events and tolerates wider temperature excursions.
تجویز کردہ
Op-Amp Supply Rail Clamping
Placed from each op-amp supply pin to ground, the 1N6489US-TR clamps transients to 4.7 V and protects sensitive analog front-ends from overvoltage events on ±5 V rails. With 1.5 W power dissipation and 8 Ω Zzt, it handles fast ESD-like spikes far better than small-signal TVS diodes of similar voltage. The hermetic MELF construction is preferred for industrial op-amp boards where reliability under thermal cycling from -65 °C to +200 °C matters.
تجویز کردہ
ADC/DAC Reference Buffer Front-End
The 1N6489US-TR can serve as a low-cost reference element in front of an ADC/DAC reference pin when system accuracy requirements are moderate (8-10 bit). Its 4.7 V nominal Zener voltage pairs naturally with 5 V supply rails, and the 4 µA leakage at 1 V reverse bias keeps idle current low. Designers typically buffer the Zener with a low-noise op-amp to drive the ADC reference pin directly, achieving a stable analog supply without the cost of a dedicated bandgap IC.
تجویز کردہ
Overvoltage Protection for Analog Inputs
Used as a shunt clamp on the input of an analog front-end, the 1N6489US-TR limits overvoltage transients to 4.7 V and dissipates up to 1.5 W of fault energy. This protects downstream op-amps, ADCs, and instrumentation amplifiers from surge events on field wiring. Combined with a series input resistor, it forms a two-stage protection network for 4-20 mA loops and other harsh-environment analog signals, particularly in industrial process-control and downhole applications.
تجویز کردہ
Shunt Regulation in 24 V Industrial Loops
In 24 V industrial loop-powered systems, the 1N6489US-TR can be combined with a series resistor to form a simple shunt regulator, providing a stable 4.7 V local rail for sensor signal conditioning. The 1.5 W dissipation and 8 Ω Zzt deliver adequate regulation for low-power analog circuits, while the wide -65 °C to +200 °C operating range handles the thermal environment of factory-floor enclosures. Its hermetic MELF package tolerates conformal coating and potting compounds better than plastic packages.
تجویز کردہ
Military and Aerospace Avionics Power Conditioning
The MIL-PRF-19500/406 qualification of the 1N6489US series makes this Zener suitable for avionics and military power conditioning, where reference rails and clamping circuits must survive harsh thermal and mechanical environments. The hermetic D-5A MELF package provides the long-term reliability required for flight-grade hardware, and the 4.7 V nominal supports legacy 5 V analog subsystems. Mission-critical designs should select the JANTX-screened variant for full Group A/B/C test coverage.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا 1N6489US-TR — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | 1N6489US | JANTX1N6489US | CDLL6489 | 1N6489US-e3 | CDLL6489 (Microsemi) |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Vishay Intertechnology | Microsemi |
| Package | D-5A (SQ-MELF) | D-5A (SQ-MELF) - same | D-5A (SQ-MELF) - same | D-5A (SQ-MELF) - same | D-5A (SQ-MELF) - same | D-5A (SQ-MELF) - same |
| Nominal Zener Voltage | 4.7 V | 4.7 V | 4.7 V | 4.7 V | 4.7 V | 4.7 V |
| Power Dissipation | 1.5 W | 1.5 W | 1.5 W | 1.5 W | 1.5 W | 1.5 W |
| Zener Impedance (Zzt) | 8 Ω max | 8 Ω max | 8 Ω max | 8 Ω max | 8 Ω max | 8 Ω max |
| Military Qualification | MIL-PRF-19500/406 (qualified) | MIL-PRF-19500/406 (qualified) | MIL-PRF-19500/406 + JANTX screening | MIL-PRF-19500/406 (qualified) | Not MIL-qualified | MIL-PRF-19500/406 (qualified) |
| Packaging Form | Tape & Reel (TR) | Bulk | Bulk | Bulk | Tape & Reel | Bulk |
| Operating Temperature | -65 °C to +200 °C | -65 °C to +200 °C | -65 °C to +200 °C | -65 °C to +200 °C | -65 °C to +200 °C | -65 °C to +200 °C |
اہم امتیازی خصوصیات
- Military-qualified hermetic MELF construction (بمقابلہGeneric 4.7 V plastic MELF Zeners (e.g., BZT52 series))
- Tape-and-reel factory packaging (بمقابلہ1N6489US (bulk))
- Tight 4.7 V Zener voltage in standard 1N64xxUS family (بمقابلہCustom-voltage specialty Zeners)
ڈیزائن نوٹس
At 1.5 W continuous dissipation the junction temperature will rise substantially. With a typical θJA of approximately 100 °C/W on a standard PCB footprint, the junction-to-ambient rise is around 150 °C, which is well above the 200 °C maximum rating when ambient is near 25 °C. Provide at least 200 mm² of 2 oz copper pad area around the MELF terminations, or use thermal vias to an internal copper plane, to keep Tj below the derating curve. At higher ambient (>75 °C) or in enclosed housings, derate to 0.75 W or less.
Use wrap-around MELF land patterns per IPC-7352 with approximately 5 mm × 2.5 mm pads. Avoid placing tall components adjacent to the MELF body to allow automated optical inspection of the cathode band marking. For high-current or pulse applications, increase the cathode-side pad area to improve thermal spreading. Reflow profiles should follow JEDEC J-STD-020 for surface-mount glass-package devices, with peak temperature not exceeding 260 °C for lead-free assembly.
Do not confuse the 1N6489US (surface-mount MELF) with the 1N6489 (axial leaded) - they share the same electrical ratings but are not interchangeable on a populated PCB. Do not exceed 1.5 W dissipation without proper thermal management, as this MELF package has limited heat-sinking capability. Finally, do not operate below Izt for stable voltage reference applications, as Zzt rises sharply at low currents and the Zener voltage will droop significantly.
تعمیل کی معلومات
MIL-PRF-19500/406 qualified per Microchip/Microsemi datasheet. RoHS, REACH, lead-free, and halogen-free compliance status not explicitly stated in provided web data and marked [DATA_NEEDED] accordingly. AEC-Q100 not applicable - this is a discrete Zener diode, not an automotive-qualified IC.
