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Vishay Siliconix DG221BDY
- Part No.:
- DG221BDY
- Manufacturer:
- Vishay Siliconix
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DG221BDY.pdf
- Description:
- IC SWITCH SPST-NCX4 90OHM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,426
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Product details
Overview
DG221BDY from Vishay Siliconix is a quad SPST CMOS analog switch with integrated latches, designed for precision signal routing in µP-based systems. It features 60 Ω typical on-resistance, ±15 V analog signal range, 150 ns minimum write pulse width, and operates across –40 °C to +85 °C. Used in data acquisition and automatic test equipment for reliable bidirectional analog switching.
For engineers reviewing the DG221BDY datasheet, DG221BDY pinout, DG221BDY application, or DG221BDY equivalent, key selection criteria include latch-controlled simultaneous switching, true bidirectional conduction, low charge injection (20 pC), and compatibility with TTL-level digital control under wide supply tolerance.
Technical Context
The DG221BDY implements four independent SPST analog switches, each with a transparent latch controlled by a common WR (Write) input. Its on-chip 5 V regulator enables stable logic interface operation despite variations in V+ and V– supplies.
Each channel supports bidirectional analog signal flow with ≤135 Ω maximum rDS(on) over temperature, while internal clamping diodes protect against overvoltage transients on S/D/IN pins up to (V−) −2 V or (V+) +2 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Signal Range | ±15 V - supports full-rail bipolar signal switching without clipping |
| rDS(on) Max | 135 Ω - ensures minimal insertion loss and voltage drop at 20 mA load |
| Off-Isolation | 70 dB @ 100 kHz - suppresses crosstalk between inactive channels in sensitive measurement paths |
| Charge Injection | 20 pC - limits voltage glitch on high-impedance nodes during switching |
| Turn-On/Off Time | 550 ns / 340 ns - enables fast multiplexing in real-time data acquisition |
| Supply Current | 1.5 mA max I+ - maintains low power consumption in multi-channel systems |
| Logic Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.4 V - ensures robust noise margin with standard TTL/CMOS drivers |
Pinout & Package
Package: 16-pin narrow SOIC (JEDEC MS-012), body width 3.9 mm, lead pitch 1.27 mm, RoHS-compliant (Pb-free terminations).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1–IN4 | Latch data inputs | Control state of corresponding switch; low = ON, high = OFF when WR = 0 |
| WR | Write enable | Low enables transparent latching; high holds last state - enables memory-mapped I/O |
| S1–S4 | Switch source terminals | Bidirectional analog ports; connect to signal sources or loads |
| D1–D4 | Switch drain terminals | Bidirectional analog ports; paired with Sx to form SPST path |
| V+, V− | Analog supply rails | Support ±15 V operation; internal clamping protects against overvoltage |
| GND | Digital ground reference | Reference for WR and INx logic levels; separate from analog return paths |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 5 V regulator | Stabilizes logic interface independently of V+/V−, enabling wide supply tolerance without compromising TTL compatibility |
| Independent latches per channel | Allows individual channel control while supporting byte-wide addressing via common WR for synchronized switching |
| Epitaxial layer construction | Prevents latchup under transient overvoltage or ESD stress, enhancing reliability in industrial environments |
| True bidirectional analog path | Enables signal routing in either direction without polarity constraints - critical for instrumentation front-ends |
| Low off-leakage current | ±100 nA max ID(off)/IS(off) - preserves accuracy in high-impedance sensor interfaces and sample-hold circuits |
Applications
| Automatic Test Equipment (ATE) | Data Acquisition Systems |
|---|---|
Use Scenario: Multiplexing multiple sensor inputs into a shared ADC channel under microprocessor control. IC Role / Device Role / Timing Role: Quad SPST analog switch with latched control enables deterministic, glitch-free channel selection synchronized to µP bus cycles. Use Value: Simultaneous 4-channel configuration via single data byte reduces software overhead and eliminates timing skew between channels. | Use Scenario: Routing calibrated reference voltages and sensor signals to precision op-amp stages in modular DAQ modules. IC Role / Device Role / Timing Role: Bidirectional analog switch providing low-distortion, low-leakage signal path with ±15 V range support. Use Value: 60 Ω rDS(on) and 20 pC charge injection minimize gain error and settling time in 16-bit+ measurement systems. |
| Medical Instrumentation | Factory Automation I/O Modules |
Use Scenario: Isolating and selecting ECG electrode inputs in multi-lead patient monitoring units. IC Role / Device Role / Timing Role: Analog switch with internal clamping diodes and latch retention ensures safe, repeatable signal routing during system reset or power transitions. Use Value: ±15 V analog range and <100 nA off-leakage preserve small-signal integrity and baseline stability in low-noise biopotential amplifiers. | Use Scenario: Configurable analog input conditioning for programmable logic controller (PLC) analog input cards handling 4–20 mA or ±10 V field signals. IC Role / Device Role / Timing Role: Precision switch enabling hardware-selectable gain/attenuation networks via µP-controlled address decoding. Use Value: Memory-mapped latching allows non-volatile channel state retention during firmware updates or watchdog resets. |
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+ | Higher rDS(on) (120 Ω typ), no on-chip regulator, requires external 3.3 V/5 V logic supply | Lacks integrated latch control; requires external shift register or GPIO for parallel control | Preferred where lower cost and smaller footprint outweigh need for latch memory and supply tolerance |
| ADG404BRZ | Lower rDS(on) (35 Ω typ), no latches, 12-bit compatible charge injection (15 pC), wider temp range (–40 °C to +125 °C) | Requires continuous digital control; unsuitable for memory-mapped I/O or hold-state operation | Selected when ultra-low on-resistance and extended temperature operation are prioritized over latch functionality |
Compared with MAX4617ESE+ and ADG404BRZ, the DG221BDY uniquely combines latch-based byte-wide addressing, on-chip regulation, and ±15 V analog capability - making it optimal for µP-controlled ATE and industrial DAQ where deterministic state retention and wide supply flexibility are required.
Availability
DG221BDY is available at Aetrix Electronics and suitable for automatic test equipment, data acquisition systems, and medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for DG221BDY 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 solutions for industrial, automotive, and computing markets.
The DG221BDY belongs to Vishay's precision analog switch product line, engineered for µP-controlled signal routing in measurement, test, and process control systems where latch retention, rail-to-rail analog range, and low distortion are essential.
FAQ
What is the maximum analog signal voltage range supported by the DG221BDY?
The DG221BDY supports an analog signal range of ±15 V when operated with V+ = +15 V and V− = −15 V. This full-rail capability allows direct interfacing with bipolar sensor outputs and industrial signal standards without level-shifting circuitry. The DG221BDY internal clamping diodes protect against overvoltage transients up to (V−) −2 V or (V+) +2 V on any S, D, or IN pin.
Does the DG221BDY require external logic-level translation when used with 3.3 V microcontrollers?
No, the DG221BDY does not require external logic-level translation. Its on-chip 5 V regulator ensures TTL-compatible logic thresholds (VIL ≤ 0.8 V, VIH ≥ 2.4 V) regardless of V+/V− supply values. The DG221BDY accepts standard 3.3 V or 5 V microcontroller outputs directly on IN1–IN4 and WR pins without additional buffering or level shifting.
How does the WR pin function in the DG221BDY, and what happens when it is held high?
The WR (Write) pin controls latch transparency: when WR is low, IN1–IN4 directly control switch states in real time; when WR is high, the DG221BDY holds the last latched state regardless of INx changes. This enables memory-mapped I/O behavior - the DG221BDY retains channel configuration during µP bus arbitration or firmware interrupts without external storage.
What is the typical on-resistance of the DG221BDY, and how does it vary with signal voltage?
The DG221BDY has a typical on-resistance of 60 Ω at ±10 V drain-source voltage and –10 mA current, with a maximum of 135 Ω over temperature and voltage range. Unlike voltage-dependent FET switches, the DG221BDY's rDS(on) remains stable across its ±15 V analog range due to its CMOS architecture and epitaxial isolation - ensuring consistent gain and linearity in precision attenuator and multiplexer designs.
Can the DG221BDY be used in bidirectional analog signal paths, and what design considerations apply?
Yes, the DG221BDY provides true bidirectional analog performance in the on state - signal flow is identical from S to D or D to S. Designers must ensure that V+ and V− remain within absolute maximum ratings relative to all connected nodes, and that external protection (e.g., series resistors) is added if S/D pins may experience transients exceeding (V−) −2 V or (V+) +2 V. The DG221BDY's low 20 pC charge injection further supports bidirectional use in sample-and-hold and switched-capacitor circuits.
DG221BDY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Switch Circuit:
- SPST - NC
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Number of Circuits:
- 4
- On-State Resistance (Max):
- 90Ohm
- Channel-to-Channel Matching (ΔRon):
- -
- Voltage - Supply, Single (V+):
- 13V ~ 18V
- Voltage - Supply, Dual (V±):
- ±7V ~ 18V
- Switch Time (Ton, Toff) (Max):
- 550ns, 340ns
- -3db Bandwidth:
- -
- Charge Injection:
- 20pC
- Channel Capacitance (CS(off), CD(off)):
- 8pF, 9pF
- Current - Leakage (IS(off)) (Max):
- 5nA
- Crosstalk:
- -90dB @ 100kHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
DG221BDY FAQ
1.How can I place an order for DG221BDY through Aetrix?
Please submit a Request for Quotation (RFQ) for DG221BDY 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 DG221BDY reliable?
The price and inventory of DG221BDY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DG221BDY is usually 5 days.
3.What payment methods are accepted for DG221BDY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DG221BDY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DG221BDY?
DG221BDY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DG221BDY 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 DG221BDY?
For technical support, including DG221BDY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DG221BDY requirements.
6.How does Aetrix verify that DG221BDY is sourced from the original manufacturer or authorized distributors?
All DG221BDY 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 DG221BDY meets industry standards.
7.What is the process for return or replacement of DG221BDY?
All DG221BDY units undergo pre-shipment inspection (PSI). If there is an issue with DG221BDY, 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 DG221BDY part is unused and in its original packaging.
Return procedure for DG221BDY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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