AVAGO HCPL-5731 (5962-89785)
- Dual-channel hermetically sealed high-gain Darlington output optocoupler
- Exceptional sensitivity: 1,500% CTR typical at just 0.5mA LED input current
- 300% minimum CTR — drives high fanout loads from MOS, CMOS, and low-power logic
- 1,500Vdc isolation, −55°C to +125°C military temperature range, 8-pin ceramic DIP
- MIL-PRF-38534 Class H and K, QML-38534 listed, DESC SMD 5962-89785
Avago Technologies (now Broadcom) developed the HCPL-5731 to address a specific and underserved class of defense isolation requirement: applications where the LED driver operates at extremely low current — 0.5mA — and where the isolated output must still drive meaningful loads without an external amplification stage. The Darlington phototransistor output architecture achieves this by delivering current transfer ratios that single-transistor optocouplers cannot approach: 300% minimum and 1,500% typical at 0.5mA input. The HCPL-5731 is available from stock at Sparkle Electronics, a specialized distributor of high-reliability and military-grade electronic components serving defense prime contractors, government procurement offices, and avionics integrators worldwide. Manufactured and tested on a MIL-PRF-38534 certified line and dual-marked with both the Avago/Broadcom device designation and DESC SMD number 5962-89785, it provides full QML-38534 traceability for DLA procurement of hybrid microcircuits.
This device occupies a distinct position within the hermetic optocoupler portfolio available from Sparkle Electronics. Where the AVAGO HCPL-5430 and AVAGO HCPL-5400 deliver 40 Mbps logic gate isolation for high-speed defense data channels, the HCPL-5731 is optimized for low-speed, low-power isolation functions: digital logic ground isolation in battery-sensitive systems, isolated current loop receivers for long-line military serial interfaces, RS-232C line reception, polarity detection, level shifting between isolated voltage domains, and microprocessor bus isolation where the driving logic operates at minimal current budgets. Two independent Darlington channels in one hermetic 8-pin ceramic DIP make it a density-efficient solution for dual-channel low-power isolation on space- and weight-constrained defense PCBs. Contact Sparkle Electronics to confirm stock and request a same-day quote.
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DESC SMD Number: 5962-89785
The HCPL-5731 is procurable under DESC Standard Military Drawing number 5962-89785, issued by the Defense Logistics Agency for the HCPL-573x hermetic high-gain Darlington optocoupler family. This SMD number places the device on the DLA Qualified Manufacturers List QML-38534 for hybrid microcircuits, providing the regulatory traceability required by defense contracts subject to DLA QML sourcing obligations.
The SMD number 5962-89785 specifically identifies the dual-channel HCPL-5731/HCPL-6731 family with 1,500Vdc isolation in 8-pin DIP hermetic packaging. The Class K variant (HCPL-573K) carries the extended SMD 5962-8978503K designation for programs requiring the most stringent DLA screening level. Procurement teams sourcing 5962-89785 stock or verifying QML-38534 Darlington optocoupler availability for low-power defense isolation requirements can confirm inventory and documentation at Sparkle Electronics. Contact our team to discuss documentation requirements before placing your order.
Why Darlington Output Changes the Defense Isolation Design Equation
The difference between a logic gate optocoupler like the HCPL-5201 or HCPL-5430 and a Darlington output device like the HCPL-5731 is not just output transistor topology — it determines which applications are even feasible without additional circuit stages. A logic gate optocoupler requires adequate LED drive current to switch its internal detector circuit and produces a logic-level voltage output. The Darlington phototransistor output of the HCPL-5731 produces an output collector current proportional to the input LED current, multiplied by a CTR that reaches 1,500% — meaning 0.5mA of LED current produces up to 7.5mA of collector output current at typical CTR, sufficient to directly drive relay coils, indicator LEDs, and high-impedance logic inputs without intermediate amplification. For procurement engineers searching HCPL-5731 in stock, Avago hermetic Darlington optocoupler 5962-89785, or MIL-PRF-38534 high-gain optocoupler distributor, Sparkle Electronics maintains ready inventory. Submit an inquiry for pricing and stock confirmation within 24 hours.
HCPL-5731 vs. HCPL-5730: Single vs. Dual Channel in the Same Family
The HCPL-5730 is the single-channel counterpart to the HCPL-5731 — same Darlington output architecture, same electrical specifications, same MIL-PRF-38534 qualification level, different channel count in the same 8-pin ceramic DIP footprint. The SMD number 5962-89810 covers the HCPL-5730 single-channel family; 5962-89785 covers the HCPL-5731 dual-channel family. Both are procurable from Sparkle Electronics.
HCPL-5731 vs. HCPL-5430 vs. HCPL-5201: Matching the Device to the Isolation Requirement
| Parameter | HCPL-5731 | HCPL-5430 | HCPL-5201 |
|---|---|---|---|
| Manufacturer | Avago / Broadcom | Avago / Broadcom | Avago / Broadcom |
| Availability | In Stock at Sparkle | In Stock at Sparkle | In Stock at Sparkle |
| Output Type | Darlington phototransistor | Logic gate totem pole | Logic gate totem pole |
| Channels | 2 | 2 | 1 |
| Data Rate | 100 KBd | 40 Mbps | 5 MBd |
| Minimum IF(ON) | 0.5mA | — | 1.6mA |
| CTR | 300% min / 1,500% typ | N/A | N/A |
| Isolation Voltage | 1,500Vdc | 1,500VDC | 1,500VDC |
| VCC Max | 18V | — | 20V |
| Temperature | −55°C to +125°C | −55°C to +125°C | −55°C to +125°C |
| Qualification | MIL-PRF-38534 H/K | MIL-PRF-38534 H/K | MIL-PRF-38534 H/K |
| SMD | 5962-89785 | DESC Drawing | 5962-88768 |
| Commercial Equivalent | HCPL-2731 | HCPL-2430 | HCPL-2201 |
The selection is application-driven: choose HCPL-5731 for low-speed, low-power isolation where high CTR eliminates the need for output stage amplification; choose HCPL-5430 for dual-channel 40 Mbps digital data bus isolation; choose HCPL-5201 for single-channel 5 MBd isolation with maximum CMR in the same MIL-PRF-38534 qualified hermetic family. Sparkle Electronics stocks all three for same-day response procurement. For broader analog and signal chain isolation requirements in aerospace and defense programs, our inventory covers the full hermetic optocoupler range.
Frequently Asked Questions
What does HCPL-5731 decode to?
HCPL = Hewlett-Packard Coupled Product Line (original HP optocoupler series, now Broadcom); 57 = hermetically sealed high-gain Darlington output optocoupler family; 31 = dual-channel variant. The HCPL-5730 is the single-channel counterpart. The HCPL-6731 is a related SMD variant in hermetic flat-pack or LCCC packaging within the same electrical family.
Where can I buy HCPL-5731 in stock?
Sparkle Electronics maintains ready stock of the HCPL-5731 for defense and aerospace procurement. Contact our team for current pricing, class level (H or K), available quantity, and confirmed lead time. Same-day response on qualified inquiries — we supply defense prime contractors, government procurement offices, and avionics systems integrators globally.
What is the DESC SMD number for HCPL-5731?
5962-89785 — the DESC Standard Military Drawing number for the HCPL-5731/HCPL-6731 dual-channel hermetic Darlington optocoupler family, enabling QPL traceability within the DLA QML-38534 system. Sparkle Electronics supplies the HCPL-5731 with certificate of conformance and lot documentation upon request.
What is the difference between HCPL-5731 and HCPL-2731?
The HCPL-5731 is the hermetically sealed, MIL-PRF-38534 qualified version of the commercial HCPL-2731. Electrical performance — CTR, IF range, VCC, output voltage, temperature operation — is equivalent across the full military temperature range. The hermetic ceramic DIP package, QML-38534 certification, and DESC SMD number differentiate the military device from its commercial counterpart. Programs transitioning from HCPL-2731 commercial designs to hermetically qualified production hardware can substitute the HCPL-5731 without circuit modification.
Why is 100 KBd the maximum data rate for the HCPL-5731?
The Darlington phototransistor output architecture — two transistors in series — introduces storage time that limits switching speed compared to integrated logic gate detectors. The 2µs turn-on and 8µs turn-off times reflect the charge storage dynamics of the Darlington configuration. For applications requiring 1 MBd or higher, a single-transistor output device or logic gate optocoupler is the correct architecture. The HCPL-5731’s advantage — extraordinary sensitivity at 0.5mA input with 1,500% CTR — exists precisely because the Darlington topology trades speed for gain.
What applications specifically benefit from the 0.5mA minimum input current?
Applications powered by current-limited interfaces — RS-232C line drivers, current loop transmitters, MOS and CMOS logic operating at reduced voltage, battery-backed systems, and long-line serial interfaces where loop current budget is constrained — benefit directly from the 0.5mA minimum IF(ON). A conventional optocoupler requiring 5mA to 10mA LED drive would either overload these interfaces or require additional buffering, adding circuit complexity and failure points. The HCPL-5731’s low IF requirement means it can often be driven directly from these constrained sources. Contact us for application-specific interface design guidance.
Sourcing HCPL-5731 for a low-power or serial isolation requirement in a defense program? Sparkle Electronics stocks the full Avago/Broadcom hermetic optocoupler range — Darlington, logic gate, and high-speed — with MIL-PRF-38534 Class H and K availability and complete QML-38534 documentation support. Submit an inquiry — same-day response on pricing, class level, and lead time.
