DG187AA - SPST Analog Switch, JFET, TO-100-10 | Vishay
N.º de pieza: DG187AA ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.2 | $162,00 |
| 100 | $13.95 | $1.395,00 |
| 500 | $11.8 | $5.900,00 |
| 1.000 | $9.95 | $9.950,00 |
DG187AA Descripción general
An analog switch (also called a JFET analog gate or solid-state analog switch) is an electronic component that uses a semiconductor device (typically a JFET or MOSFET) to connect or disconnect an analog signal path under the control of a digital logic input. Analog switches sit within the broader taxonomy of signal switches -> multiplexers/switches -> interface ICs -> integrated circuits, and they are essential whenever an analog signal must be routed without injecting distortion, charge injection, or significant series resistance. The DG187AA's JFET architecture keeps the on-resistance relatively constant over a wide analog signal range, which is a key advantage over simple MOSFET-only designs in precision instrumentation.
Key differentiating features of the DG187AA include: (1) a high-speed level-shifting driver that accepts low-level CMOS/TTL-compatible inputs (down to approximately 0.8V to 2V) and uses them to control the JFET switch state, (2) analog signal range operation that suits both unipolar and bipolar audio/precision signals, (3) low charge injection thanks to the JFET topology, and (4) a hermetic TO-100 metal can that supports military temperature grades (-55C to +125C). The metal-can packaging also provides excellent EMI shielding for sensitive analog signal routing in instrumentation front-ends.
In terms of electrical architecture, the DG187AA integrates the JFET switch die and the level-shifting driver die within a single TO-100 can, allowing the part to be driven directly from logic-level inputs without external pull-ups or level translators. This single-package integration reduces board area and simplifies PCB layout compared with discrete JFET-plus-driver implementations. The switching speed, while not as fast as modern CMOS analog switches, is sufficient for audio, instrumentation multiplexing, sample-and-hold front-ends, and legacy industrial signal routing.
Typical applications for the DG187AA include: (1) precision instrumentation multiplexers, (2) audio signal routing in professional and broadcast equipment, (3) sample-and-hold amplifier front-ends, (4) data-acquisition system signal gating, (5) legacy industrial process-control signal switching, and (6) military and aerospace signal routing where the TO-100 hermetic can is required. The MIL-spec /883 variant (DG187AA/883) confirms the part's qualification for harsh-environment designs.
When designing with the DG187AA, note that the TO-100 package has 10 leads arranged in a circular metal can, with pin 1 typically marked by a tab or dot near the package base. Because the package is a through-hole metal can (not surface-mount), PCB layout requires plated through-holes on a 0.230 inch lead circle typical of TO-100 cans. Always consult the manufacturer datasheet for the exact pinout, especially when migrating from the /883 to the commercial-temperature variant.
This page synthesizes distributor pricing, hermetic package availability, MIL-spec drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternativas directas para DG187AA — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
DG186AA
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
DG188AA
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
DG189AA
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
DG187AA/883
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
DG181AA
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
DG187AA Valores máximos y características eléctricas
| Switch Type | SPST (Single-Pole Single-Throw) |
| Number of Circuits | 1 |
| Switch Element | N-channel JFET with level-shifting driver |
| On-Resistance (Ron) | 30 Ohm (typical) |
| Configuration | 1 of 1 (SPST NO/NC analog gate) |
| Input Logic Compatibility | Low-level CMOS/TTL (approx. 0.8 V to 2 V threshold) |
| Analog Signal Range | Bipolar analog signal compatible (per JFET family spec) |
| Package Type | TO-100-10 metal can, through-hole |
| Número de pines | 10 |
| Temperature Grade | MILITARY (per Vyrian listing) |
| Terminal Finish (JESD-609) | e0 (non-RoHS, SnPb or non-compliant finish) |
| Package Shape | ROUND (metal can) |
| Terminal Position | BOTTOM (through-hole leads exiting base) |
| Manufacturer | Vishay Siliconix (originally Intersil) |
| Family Series | DG181 through DG191 analog gates |
| MIL-spec Variant | DG187AA/883 available |
Configuración de pines de DG187AA
| Pin 1 | IN — Logic input (level-shifted to drive JFET gate) |
| Pin 2 | GND — Logic/driver ground reference |
| Pin 3 | V- — Negative supply for level-shifting driver |
| Pin 4 | NC — Not connected (per datasheet pinout convention for TO-100-10 DG187 family) |
| Pin 5 | S1 — JFET source terminal (analog signal) |
| Pin 6 | D1 — JFET drain terminal (analog signal) |
| Pin 7 | V+ — Positive supply for level-shifting driver |
| Pin 8 | NC — Not connected (per datasheet pinout convention) |
| Pin 9 | NC — Not connected (per datasheet pinout convention) |
| Pin 10 | CASE — Case/shield (typically tied to analog ground for EMI shielding) |
Aplicaciones típicas
DG187AA es adecuado para 6 aplicacións: Precision Instrumentation Multiplexer, Audio Signal Routing in Broadcast Equipment, Sample-and-Hold Amplifier Front-End, Data-Acquisition System Signal Gating, Legacy Industrial Process-Control Signal Switching, Military and Aerospace Signal Routing.
Precision Instrumentation Multiplexer
The DG187AA's 30 Ohm on-resistance and JFET-based analog switch topology make it suitable for precision instrumentation multiplexer front-ends. Its N-channel JFET switch exhibits relatively flat Ron versus analog signal voltage, which minimizes distortion when routing low-level transducer signals (thermocouples, strain gauges, RTDs) through a multiplexer tree. The integrated level-shifting driver accepts CMOS/TTL inputs down to 0.8 V, simplifying digital control without external pull-up components, while the TO-100-10 metal can provides EMI shielding for sensitive analog paths. Use this part for legacy instrumentation backplanes where through-hole TO-100 cans are still preferred over SMD alternatives.
Recomendado
Audio Signal Routing in Broadcast Equipment
Professional audio and broadcast equipment benefits from the DG187AA's low-distortion JFET switching and EMI-shielded TO-100 metal can. The JFET topology minimizes charge injection and produces relatively constant on-resistance across the audio band, preserving signal integrity when routing balanced audio lines between sources and mixing consoles. The metal can package also shields the analog signal path from nearby digital switching noise, an important consideration when routing mic-level signals in the same chassis as digital processors. For balanced +4 dBu or -10 dBV audio paths, the DG187AA is a reliable legacy switching element.
Recomendado
Sample-and-Hold Amplifier Front-End
Sample-and-hold amplifier front-ends benefit from the DG187AA's JFET-based switch topology, which provides low charge injection compared with simple MOSFET-only switches. The 30 Ohm Ron combined with a low-leakage JFET element helps preserve the held voltage on the holding capacitor between acquisition cycles. The integrated level-shifting driver simplifies timing-control logic by accepting low-level CMOS/TTL inputs directly. Designers building legacy data-acquisition front-ends can use the DG187AA in front of a hold capacitor followed by a precision op-amp buffer, taking advantage of the TO-100-10 metal can's hermeticity for stable capacitor charge retention over time.
Recomendado
Data-Acquisition System Signal Gating
Data-acquisition systems (DAS) often use the DG187AA as a gating element to control which analog input channel is connected to a downstream ADC at any given time. The JFET switch's flat Ron characteristic preserves measurement accuracy across the analog input range, while the integrated level-shifting driver allows direct interface to the system's microcontroller or FPGA without external level translation. The TO-100-10 metal can also contributes to long-term measurement stability in industrial environments where temperature swings and vibration could stress less-robust SMD packages. For DAS designs that demand MIL-spec reliability, the DG187AA/883 variant is the qualified drop-in.
Recomendado
Legacy Industrial Process-Control Signal Switching
Industrial process-control systems frequently retain legacy 4-20 mA current-loop and 0-10 V analog signal paths that benefit from the DG187AA's JFET-based switching. The TO-100-10 metal can provides mechanical robustness in factory-floor environments with vibration and thermal cycling, while the level-shifting driver accepts 24 V logic levels typical of PLC outputs after simple resistor attenuation. The part's MILITARY temperature grade (-55C to +125C) and MIL-STD-883 screening option (DG187AA/883) make it suitable for outdoor or uncontrolled-temperature industrial cabinets where commercial-grade SMD switches would degrade rapidly.
Recomendado
Military and Aerospace Signal Routing
The DG187AA/883 MIL-spec variant is qualified for military and aerospace signal-routing applications where hermetic packaging and extended temperature range are mandatory. The TO-100-10 metal can is inherently hermetic, providing protection against humidity, salt fog, and outgassing that would damage plastic-encapsulated SMD switches. Avionics, shipboard, and ground-vehicle signal-routing designs that need MIL-STD-883 screening continue to specify this family. The DG187AA's level-shifting driver interfaces directly to legacy 5 V and 3.3 V logic families used in aerospace digital subsystems, simplifying interface design without additional level translators.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para DG187AA — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | DG186AA | DG188AA | DG189AA | DG187AA/883 | DG181AA |
|---|---|---|---|---|---|---|
| Brand | Vishay Siliconix (originally Intersil) | Vishay Siliconix | Vishay Siliconix | Vishay Siliconix | Vishay Siliconix | Vishay Siliconix |
| Package | TO-100-10 metal can | TO-100-10 metal can - same | TO-100-10 metal can - same | TO-100-10 metal can - same | TO-100-10 metal can - same | TO-100-10 metal can - same |
| Switch Type | SPST (1 circuit) | SPST (1 circuit) - same | SPST (1 circuit) - same | SPST (1 circuit) - same | SPST (1 circuit) - same | SPST (1 circuit) - same |
| On-Resistance (Ron) | 30 Ohm (typical) | 30 Ohm (typical) - same | 30 Ohm (typical) - same | 30 Ohm (typical) - same | 30 Ohm (typical) - same | 30 Ohm (typical) - same |
| Temperature Grade | Military (-55C to +125C) | Military - same | Military - same | Military - same | Military + MIL-STD-883 screening | Military - same |
| Logic Polarity | AA (specific polarity per family datasheet) | AA - same polarity | Complementary polarity | Complementary polarity | AA - same polarity | AA - same polarity |
| MIL-STD-883 Screening | Optional (suffix /883) | Optional (suffix /883) | Optional (suffix /883) | Optional (suffix /883) | Yes (factory-screened /883) | Optional (suffix /883) |
| RoHS Status (JESD-609) | e0 (non-RoHS standard) | e0 (non-RoHS standard) | e0 (non-RoHS standard) | e0 (non-RoHS standard) | e0 (non-RoHS, hermetic SnPb) | e0 (non-RoHS standard) |
Diferenciadores clave
- Hermetic TO-100-10 metal can package for MIL-spec applications (frente a Modern SMD analog switches (e.g., ADG1219BRJZ-REEL7 SOT-23-6))
- JFET-based switch with integrated level-shifting driver in a single package (frente a Discrete JFET-plus-driver implementations)
- Wide military temperature range (-55C to +125C) (frente a Commercial-grade SMD analog switches (typically 0C to +70C or -40C to +85C))
Notas de diseño
The TO-100-10 metal can requires through-hole plated pads on a circular 0.230 inch (5.84 mm) lead circle typical of TO-100 cans. PCB layout must reserve adequate annular ring for the leads (minimum 1.5 mm pad diameter) and provide a grounded copper pour under the can body to enhance the EMI shielding benefit of the metal package. Pin 1 is typically identified by a small tab or dot adjacent to lead 1; consult the manufacturer datasheet pinout diagram before finalizing the silkscreen legend, because legacy TO-100 conventions vary by manufacturer.
Do not assume the DG187AA is RoHS compliant without checking the JESD-609 finish code on the specific lot. According to the verified Vyrian listing, the standard part carries a JESD-609 code of e0, indicating a non-RoHS terminal finish (typically SnPb or non-compliant plating). For RoHS-compliant designs, request a specifically marked RoHS variant or select a different analog switch family. Mixing e0-finished parts onto a RoHS-only assembly will fail compliance audits and reflow profile requirements.
The DG187AA's 30 Ohm on-resistance introduces a non-negligible voltage drop when carrying signals into a high-impedance load, and a measurable insertion loss when carrying signals from a low-impedance source. For instrumentation front-ends, always use the DG187AA to drive a high-impedance buffer (>= 100 kOhm) downstream of the switch rather than directly into a low-impedance ADC input. The JFET topology provides relatively flat Ron versus analog signal voltage, but designers should still budget for the 30 Ohm series resistance in the worst-case signal-chain error analysis. Always include a small series resistor (10-100 Ohm) at the JFET source/drain pins if driving capacitive loads to limit transient current during switching.
Información de cumplimiento
Standard DG187AA carries JESD-609 finish code e0 per verified Vyrian listing (non-RoHS). MIL-STD-883 screening available via /883 suffix variant. AEC-Q100 not applicable (analog switch IC family, not automotive-qualified).
