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Vishay Siliconix DG445DY
- Part No.:
- DG445DY
- Manufacturer:
- Vishay Siliconix
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DG445DY.pdf
- Description:
- IC SWITCH SPST-NOX4 85OHM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,084
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Product details
Overview
DG445DY from Vishay Siliconix is a quad SPST normally open CMOS analog switch in 16-pin narrow SOIC package, featuring 50 Ω typical on-resistance, 120 ns typical turn-on time, and ±15 V dual-supply or +12 V single-supply operation. It enables precision signal routing in sample-and-hold circuits, audio switching, and automatic test equipment where low charge injection (–1 pC) and sub-80 pA leakage are critical.
For engineers reviewing the DG445DY datasheet, DG445DY pinout, DG445DY application, or DG445DY equivalent, key selection criteria include its NO configuration, rail-to-rail analog signal range (±15 V), TTL/CMOS logic compatibility, and upgrade path from DG212 sockets in battery-powered and telecom systems.
Technical Context
The DG445DY implements four independent bidirectional analog switches fabricated on Vishay's high-voltage silicon-gate process with epitaxial latchup protection. Each channel conducts equally in both directions when enabled and blocks signals beyond supply rails when off.
Its control logic is inverted relative to DG444: logic high (≥2.4 V) enables conduction, while logic low (≤0.8 V) disables all channels. The device supports wide supply ranges-dual ±5 V to ±20 V or unipolar +5 V to +36 V-with dedicated VL pin for logic-level translation independent of analog supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Type | Quad SPST, normally open (NO) |
| RDS(on) | 50 Ω typical - ensures minimal signal attenuation and distortion in precision analog paths |
| tON | 120 ns typical - enables fast multiplexing in data acquisition and ATE systems |
| Charge Injection | –1 pC typical - reduces pedestal error in sample-and-hold applications |
| IS(off) | ±0.01 nA typical - maintains high DC accuracy in high-impedance sensor interfaces |
| Analog Range | ±15 V (dual supply) - supports full-rail signal switching without clipping |
| Logic Compatibility | TTL/CMOS - simplifies interface with microcontrollers and FPGAs without level shifters |
Pinout & Package
Package: 16-pin narrow-body SOIC (JEDEC MS-012), 7.62 mm × 5.59 mm footprint, 1.27 mm pitch, 2.79 mm max height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 9, 13 | IN1–IN4 | Digital control inputs - active-high logic enables corresponding switch |
| 2, 6, 10, 14 | S1–S4 | Source terminals - bidirectional analog input/output nodes |
| 3, 7, 11, 15 | D1–D4 | Drain terminals - bidirectional analog input/output nodes |
| 4 | V− | Negative supply rail - sets lower analog voltage limit and bias reference |
| 8 | GND | Ground reference - common return for digital and analog sections |
| 12 | V+ | Positive supply rail - sets upper analog voltage limit and bias reference |
| 16 | VL | Logic supply - decouples logic threshold from analog rails for flexible interfacing |
Key Features
| Feature | Design Value |
|---|---|
| Low on-resistance matching | 50 Ω typical with tight channel-to-channel uniformity - preserves gain accuracy in programmable-gain amplifiers |
| Ultra-low leakage | ±0.01 nA typical off-state current - prevents drift in high-impedance sample-and-hold hold capacitors |
| Minimized charge injection | –1 pC typical - limits voltage step error during sampling, critical for 12-bit+ resolution systems |
| Wide supply flexibility | Supports ±5 V to ±20 V dual or +5 V to +36 V single supply - eliminates need for separate analog/digital rails |
| Latchup immunity | Epitaxial layer isolation - ensures robust operation in noisy industrial environments without destructive failure |
Applications
| Audio Signal Routing | Data Acquisition Multiplexing |
|---|---|
Use Scenario: Switching between multiple microphone or line-level inputs in professional audio mixers. IC Role / Device Role / Timing Role: Quad SPST analog switch providing isolated, low-distortion signal path selection under microcontroller control. Use Value: 50 Ω RDS(on) and <100 dB crosstalk preserve stereo channel separation and dynamic range. | Use Scenario: Scanning 16-channel sensor array outputs into a single ADC input in environmental monitoring systems. IC Role / Device Role / Timing Role: Precision analog multiplexer enabling sequential sampling with minimal settling error. Use Value: 120 ns tON and –1 pC charge injection ensure accurate capture of fast transients and stable hold voltage. |
| Sample-and-Hold Circuits | Telecom Line Interface |
Use Scenario: Capturing analog voltage from a photodiode amplifier before digitization in optical sensing modules. IC Role / Device Role / Timing Role: Low-leakage, low-charge-injection switch controlling hold capacitor connection to signal source. Use Value: ±0.01 nA off-leakage and –1 pC charge injection limit hold-time drift to <1 LSB over 10 ms at 12-bit resolution. | Use Scenario: Isolating test signals from live telecom line pairs during maintenance diagnostics. IC Role / Device Role / Timing Role: High-voltage analog switch protecting test equipment from ±48 V line voltages and transients. Use Value: ±20 V absolute max rating and 44 V V+–V− tolerance enable safe operation across telecom power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad SPST analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4617ESE+ | Lower RDS(on) (35 Ω typ), but only ±15 V max supply; no VL pin - logic tied to V+. | Better for low-voltage, high-speed muxing; unsuitable for split-rail logic interfacing. | Select when minimizing on-resistance is primary and supply headroom is limited. |
| ADG445BRUZ | Same NO function and pinout; higher leakage (±20 pA typ); requires VLOGIC = VDD. | Compatible in footprint and function but less suitable for ultra-low-leakage hold circuits. | Choose when sourcing from Analog Devices ecosystem and leakage <5 pA is not required. |
Compared with MAX4617ESE+ and ADG445BRUZ, the DG445DY offers unique VL pin independence, –1 pC charge injection, and ±20 V dual-supply capability - making it optimal for precision sample-and-hold and telecom isolation where rail flexibility and pedestal error minimization are critical.
Availability
DG445DY is available at Aetrix Electronics and suitable for audio switching, data acquisition, and sample-and-hold circuits requiring stable component supply across industrial temperature range (–40 °C to +85 °C).
Supply support for DG445DY includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay Siliconix is a global leader in discrete semiconductors and passive components, specializing in high-reliability analog switches, MOSFETs, and power management devices.
The DG445DY belongs to Vishay's high-voltage CMOS analog switch product line, engineered for precision signal routing in demanding test, measurement, and industrial control applications where low distortion, low leakage, and rail-to-rail operation are essential.
FAQ
What is the logic polarity of DG445DY control inputs?
The DG445DY uses active-high logic: a logic high (≥2.4 V) on IN1–IN4 turns the corresponding switch ON (closed), while a logic low (≤0.8 V) turns it OFF (open). This is the inverse of the DG444DY, which is normally closed. The DG445DY datasheet confirms this behavior in its truth table and Figure 2 test circuit, where the logic input waveform is explicitly noted as inverted for DG445.
Does DG445DY support single-supply operation?
Yes, DG445DY supports unipolar operation from +5 V to +36 V. In single-supply mode, V− is connected to ground, V+ supplies the positive rail, and analog signals swing from 0 V to V+. The datasheet specifies guaranteed performance at +12 V with analog range 0–12 V and RDS(on) ≤200 Ω - confirming robust functionality in battery-powered and industrial control systems.
What is the maximum allowable voltage difference between V+ and V− for DG445DY?
The absolute maximum rating for DG445DY specifies V+ to V− = 44 V. This allows configurations such as +20 V/–20 V (40 V differential) or +36 V/0 V (36 V differential), staying within safe operating limits. Exceeding 44 V risks permanent damage, as stated in the Absolute Maximum Ratings table on page 2 of the Vishay document S13-2503-Rev. H.
How does the VL pin function in DG445DY?
The VL pin sets the logic threshold reference independently of V+ and V−, enabling TTL/CMOS-compatible control even when analog supplies exceed logic voltage levels. For example, with V+ = +15 V, V− = –15 V, and VL = +5 V, the DG445DY interprets 0.8 V as logic low and 2.4 V as logic high - eliminating need for external level shifters in mixed-supply systems.
Is DG445DY pin-compatible with DG444DY?
Yes, DG445DY and DG444DY share identical pinout, package (16-pin narrow SOIC), and electrical interface - differing only in functional behavior (NO vs. NC). Both use the same IN/S/D/V+/V−/GND/VL pin assignments and support identical supply ranges, allowing direct substitution in layouts where switch logic state is managed in firmware or external logic.
DG445DY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Circuit:
- SPST - NO
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Number of Circuits:
- 4
- On-State Resistance (Max):
- 85Ohm
- Channel-to-Channel Matching (ΔRon):
- -
- Voltage - Supply, Single (V+):
- 5V ~ 36V
- Voltage - Supply, Dual (V±):
- ±5V ~ 20V
- Switch Time (Ton, Toff) (Max):
- 250ns, 210ns
- -3db Bandwidth:
- -
- Charge Injection:
- -1pC
- Channel Capacitance (CS(off), CD(off)):
- 4pF, 4pF
- Current - Leakage (IS(off)) (Max):
- 500pA
- Crosstalk:
- -100dB @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
DG445DY FAQ
1.How can I place an order for DG445DY through Aetrix?
Please submit a Request for Quotation (RFQ) for DG445DY on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DG445DY reliable?
The price and inventory of DG445DY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DG445DY is usually 5 days.
3.What payment methods are accepted for DG445DY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DG445DY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DG445DY?
DG445DY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DG445DY order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DG445DY?
For technical support, including DG445DY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DG445DY requirements.
6.How does Aetrix verify that DG445DY is sourced from the original manufacturer or authorized distributors?
All DG445DY products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DG445DY meets industry standards.
7.What is the process for return or replacement of DG445DY?
All DG445DY units undergo pre-shipment inspection (PSI). If there is an issue with DG445DY, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DG445DY part is unused and in its original packaging.
Return procedure for DG445DY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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