AVAGO HCPL-7850
- Hermetically sealed sigma-delta analog isolation amplifier — not a logic gate optocoupler
- 8.00 V/V gain (5% tolerance), 0.1% nonlinearity, ±5mV max offset voltage
- 100 kHz small-signal bandwidth (−3dB), 8 kV/µs CMR at VCM = 1000V
- 1,500Vdc isolation withstand, ±200mV differential input range, 4.5V to 5.5V dual supply
- Performance guaranteed −55°C to +125°C; MIL-PRF-38534 certified line, QML-38534
Avago Technologies (now Broadcom) designed the HCPL-785x family to solve an isolation problem that logic gate optocouplers cannot address: accurate, linear, analog signal transfer across an isolation barrier. Where the HCPL-5201, HCPL-5430, and HCPL-6631 transmit digital logic states, the HCPL-7850 transmits a continuous analog voltage with specified gain, nonlinearity, bandwidth, and offset — making it suitable for precision current sensing, motor drive feedback loops, and analog measurement in defense and industrial power electronics. The HCPL-7850 is available from stock at Sparkle Electronics, a specialized distributor of high-reliability and military-grade electronic components serving defense prime contractors, avionics OEMs, and industrial systems integrators worldwide. Its internal architecture — a sigma-delta ADC on the input side, optical coupling, and a DAC with output filter on the output side — delivers the combination of analog accuracy and galvanic isolation that conventional current transformers and Hall-effect sensors struggle to provide in high-switching environments.
The HCPL-7850 is the commercial-grade hermetically sealed variant of this family, capable of operation and storage across the full military temperature range of −55°C to +125°C. The HCPL-7851 is the MIL-PRF-38534 Class H version with full QML-38534 lot screening; the ACPL-785E provides Class E (near-K) screening with defined exceptions; both are procurable under DLA SMD 5962-97557. For aerospace and defense programs requiring the analog isolation capability with documented military screening, Sparkle Electronics stocks all variants. When used with a shunt resistor for motor phase current monitoring, the HCPL-7850 outperforms current transformers in bandwidth and outperforms Hall-effect sensors in isolation robustness — a combination directly applicable to radar and electronic warfare power amplifier current sensing and avionics power management feedback. Contact Sparkle Electronics to confirm stock and request a same-day quote.
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Analog Isolation in a Hermetic Package: What Sets the HCPL-7850 Apart
Every other hermetic optocoupler in Sparkle’s Avago portfolio — the AVAGO HCPL-5201 (5962-88768), AVAGO HCPL-5430, AVAGO HCPL-6631 (8102802), AVAGO HCPL-5731 (5962-89785) — transmits a digital signal. The HCPL-7850 is categorically different: it transmits an analog voltage, with specified gain accuracy, linearity, bandwidth, and noise performance. This makes it the only device in the hermetic portfolio capable of precision current sensing, closed-loop analog feedback, or waveform isolation — functions that are simply not in scope for any logic gate or transistor output optocoupler. Procurement engineers searching HCPL-7850 in stock, Avago hermetic analog isolation amplifier, or sigma-delta isolation amplifier defense distributor will find Sparkle Electronics maintains ready inventory. Submit an inquiry for pricing and stock confirmation within 24 hours.
Sigma-Delta Architecture: Why Analog Accuracy Survives the Optical Boundary
A conventional analog optocoupler uses a phototransistor CTR to represent the input signal — a method fundamentally limited by the nonlinearity and temperature dependence of the LED-transistor optical path. The HCPL-7850 sidesteps this entirely: the input analog voltage is converted to a digital bit stream by a sigma-delta ADC on the isolated input side, that digital stream crosses the optical barrier, and a DAC with output filter reconstructs the analog signal on the output side. The optical coupling transmits only a digital signal — immune to CTR variation — and all analog accuracy specifications (gain, nonlinearity, offset) are determined by the ADC and DAC, not the optical path. The result is 0.1% nonlinearity and 5% gain tolerance that remains stable over the full −55°C to +125°C military temperature range.
HCPL-7850 vs. HCPL-7851 vs. ACPL-785E: Choosing the Right Screening Level
| Parameter | HCPL-7850 | HCPL-7851 | ACPL-785E |
|---|---|---|---|
| Screening Level | Commercial hermetic | MIL-PRF-38534 Class H | MIL-PRF-38534 Class E |
| Temperature Testing | 25°C only | 25°C, 125°C, −55°C | 25°C, 125°C, −55°C |
| QML-38534 | No | Yes | Yes (with exceptions) |
| DLA SMD | — | 5962-9755701HPC | 5962-9755701EPC |
| Temperature Range | −55°C to +125°C | −55°C to +125°C | −55°C to +125°C |
| Gain | 8.00 V/V ±5% | 8.00 V/V ±5% | 8.00 V/V ±5% |
| Nonlinearity | 0.1% max | 0.1% max | 0.1% max |
| Availability | In Stock at Sparkle | In Stock at Sparkle | Confirm with Sparkle |
The HCPL-7850 is the correct choice for development, qualification testing, and programs that do not require DLA QML traceability but still need hermetic packaging and military temperature operation. The HCPL-7851 is required for programs specifying MIL-PRF-38534 Class H lot screening and QML-38534 procurement traceability. Contact Sparkle Electronics to confirm which variant and screening level is available for your program timeline.
Frequently Asked Questions
What does HCPL-7850 decode to?
HCPL = Hewlett-Packard Coupled Product Line (original HP series, now Broadcom); 78 = hermetically sealed analog isolation amplifier family; 50 = standard gain variant. The HCPL-7851 is the Class H military-screened version; the ACPL-785E is the Class E screened version; all three share identical electrical specifications and are procurable under DLA SMD 5962-97557 (HCPL-7851 and ACPL-785E).
Where can I buy HCPL-7850 in stock?
Sparkle Electronics maintains ready stock of the HCPL-7850 for defense, aerospace, and high-reliability industrial procurement. Contact our team for current pricing, variant availability (7850/7851/785E), and confirmed lead time. Same-day response on qualified inquiries.
What is the DLA SMD number for this part?
DLA SMD 5962-97557 applies to the HCPL-7851 (Class H) and ACPL-785E (Class E) variants. The commercial HCPL-7850 is not procured under an SMD number but uses the same hermetic package and electrical die. Specific SMD extensions: Class H gold plate = 5962-9755701HPC; Class E gold plate = 5962-9755701EPC.
How does the sigma-delta architecture achieve 0.1% nonlinearity across temperature?
The sigma-delta ADC converts the analog input to a noise-shaped digital bit stream whose time-average is linearly proportional to the input voltage. This digital representation is immune to the temperature-dependent nonlinearities of the optical coupling path. The DAC and output filter on the receive side reconstruct the analog signal from the linear digital representation. Because linearity is set by the ADC and DAC — not by an optical CTR — the 0.1% nonlinearity specification holds across the full −55°C to +125°C range without trimming or compensation.
What external components are required for the HCPL-7850?
Minimum requirements: 0.1µF bypass capacitors between pins 1 and 4 (input side VDD1/GND1) and between pins 5 and 8 (output side VDD2/GND2), placed as close as possible to the package. For current sensing applications, a shunt resistor on the input side and an anti-aliasing RC filter are recommended. An optional external post-amplifier can further filter sigma-delta quantization noise and provide additional gain. The recommended application circuit is detailed in the Broadcom datasheet.
Can HCPL-7850 replace a Hall-effect sensor or current transformer?
In many motor drive and power converter current sensing applications, yes. The HCPL-7850 offers advantages over Hall-effect sensors in isolation voltage (1,500Vdc vs. typical 200–400V) and CMR performance (8 kV/µs vs. susceptibility to switching noise). Compared to current transformers, it provides DC response and smaller form factor. The ±200mV input range and 8 V/V gain are matched to shunt resistor-based sensing designs. Contact us for application-specific design support.
Sourcing HCPL-7850 for a precision analog isolation requirement in a defense or industrial program? Sparkle Electronics stocks Avago hermetic analog isolation amplifiers — commercial, Class H, and Class E — alongside the full hermetic digital optocoupler range, all with military temperature capability. Submit an inquiry — same-day response on pricing, screening level, and lead time.
