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Vishay Siliconix DG221BDY-T1
- Part No.:
- DG221BDY-T1
- Manufacturer:
- Vishay Siliconix
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DG221BDY-T1.pdf
- Description:
- IC SWITCH SPST-NCX4 90OHM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,786
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Product details
Overview
DG221BDY-T1 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 communication systems where latch-controlled channel selection and bidirectional analog switching are required.
For engineers reviewing the DG221BDY-T1 datasheet, DG221BDY-T1 pinout, DG221BDY-T1 application, or DG221BDY-T1 equivalent, key selection criteria include latch-enabled memory-mapped control, true bidirectional analog path performance, low leakage (±0.02 nA drain off-leakage), and SOIC-16 packaging compatible with automated PCB assembly.
Technical Context
The DG221BDY-T1 implements four independent SPST switches, each controlled by a dedicated input (IN1–IN4) and a shared WR (Write) line that latches control states. Its on-chip 5 V regulator enables stable TTL-compatible logic interface despite wide supply rails (V+ = +15 V, V− = −15 V).
Each switch supports true bidirectional analog conduction with 20 mA continuous current handling, epitaxial layer latchup protection, and clamped I/O (V− −2 V to V+ +2 V). Switching times are specified at 550 ns turn-on and 340 ns turn-off under standard test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Signal Range | ±15 V - supports full-rail bipolar signal switching without clipping |
| rDS(on) Typical | 60 Ω - ensures minimal insertion loss and distortion in precision analog paths |
| ID(off) Max | ±0.02 nA - enables high-impedance signal integrity in medical and instrumentation front-ends |
| tON / tOFF | 550 ns / 340 ns - meets timing requirements for µP-bus synchronized switching |
| Write Pulse Width Min | 150 ns - compatible with standard 8-bit microprocessor bus cycles |
| Supply Current (I+, I−) | 1.5 mA / −0.4 mA - low power consumption suitable for battery-backed or multi-channel systems |
| Charge Injection | 20 pC - limits voltage glitch in sample-and-hold and multiplexed ADC applications |
Pinout & Package
Package: 16-pin narrow SOIC (JEDEC MS-012), body width 3.9 mm, lead pitch 1.27 mm, RoHS-compliant lead-free termination (T1 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 (IN1–IN4) | Digital control inputs | Active-low logic selects ON/OFF state of corresponding switch when WR = 0 |
| 5, 6, 13, 14 (S1–S4) | Switch source terminals | Analog input/output nodes; bidirectional conduction when switch is ON |
| 7, 8, 11, 12 (D1–D4) | Switch drain terminals | Analog input/output nodes; electrically identical to Sx in ON state |
| 9 (V−) | Negative analog supply | Bias reference for analog channel operation; must be ≤ V+ − 34 V |
| 10 (WR) | Write enable/latch control | Low level captures INx states; high level holds last latched configuration |
| 15, 16 (V+, GND) | Positive supply and ground | V+ powers analog core and internal 5 V regulator; GND is digital/analog common reference |
Key Features
| Feature | Design Value |
|---|---|
| Latch-enabled memory mapping | Four switches addressed as one byte via WR + IN1–IN4, enabling single-cycle µP write for simultaneous channel control |
| True bidirectional analog path | No polarity dependence - S/D terminals interchangeable in ON state, preserving signal fidelity in AC-coupled paths |
| On-chip 5 V regulator | Maintains TTL-compatible logic thresholds across wide V+/V− ranges, eliminating external level-shifting circuitry |
| Epitaxial latchup protection | Prevents destructive parasitic SCR activation during overvoltage transients or rail sequencing |
| Clamped I/O structure | Internal diodes limit S/D/IN pins to V− −2 V / V+ +2 V, simplifying ESD protection design |
Applications
| Medical Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Multiplexing sensor signals (ECG, EEG, pressure transducers) into a shared ADC channel with minimal crosstalk and offset error. IC Role / Device Role / Timing Role: Precision analog switch providing channel isolation and low-charge-injection signal routing under µP control. Use Value: 90 dB interchannel crosstalk and 20 pC charge injection ensure accurate multi-sensor sampling without calibration drift. | Use Scenario: Routing calibrated reference voltages and sensor inputs to successive ADC stages in industrial PLC modules. IC Role / Device Role / Timing Role: Latch-controlled SPST switch enabling deterministic, non-volatile channel selection between measurement cycles. Use Value: Memory-mapped operation allows single-byte write to configure all four channels, reducing µP overhead and timing jitter. |
| Communication Systems | Automatic Test Equipment |
Use Scenario: Selecting between RF front-end filter banks or IF signal paths in baseband processing units. IC Role / Device Role / Timing Role: Bidirectional analog switch supporting signal flow in either direction with flat frequency response up to 100 kHz. Use Value: ±15 V analog range and 70 dB off-isolation prevent signal bleed-through during path reconfiguration. | Use Scenario: Configuring stimulus/sense paths for semiconductor device parametric testing with programmable channel assignment. IC Role / Device Role / Timing Role: High-reliability analog switch with guaranteed 20 mA continuous current per channel for DUT interface control. Use Value: 60 Ω on-resistance and <150 ns write pulse support fast test sequence execution without signal degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4617ESE+ | Single-supply only (up to +12 V), no negative rail support; 65 Ω rDS(on); no on-chip regulator | Not suitable for bipolar ±15 V signal routing; requires external level shifters for TTL interface | Select when system uses only positive supplies and lower cost is prioritized over rail flexibility |
| ADG421BRZ | Quad SPST, ±15 V rated, but no latches; requires continuous logic drive; 45 Ω rDS(on) | Lacks memory mapping - unsuitable for µP-bus memory-mapped I/O without glue logic | Choose when latch functionality is unnecessary and lowest on-resistance is critical |
Compared with DG221BDY-T1, MAX4617ESE+ lacks bipolar supply capability and latch control, limiting use to unipolar systems; ADG421BRZ offers lower on-resistance but requires active logic drive per cycle, increasing µP resource load and timing complexity.
Availability
DG221BDY-T1 is available at Aetrix Electronics and suitable for medical instrumentation, data acquisition systems, and automatic test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for DG221BDY-T1 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 switching, power MOSFETs, and precision resistive solutions.
The DG221B product line delivers latchable, low-distortion analog switches optimized for µP-controlled signal routing in instrumentation, test, and industrial control systems where deterministic channel configuration and rail-to-rail analog performance are essential.
FAQ
What is the maximum analog signal voltage range supported by the DG221BDY-T1?
The DG221BDY-T1 supports an analog signal range of ±15 V when operated with V+ = +15 V and V− = −15 V. This full-rail capability enables direct interfacing with bipolar sensors and op-amp outputs without external level shifting. The device maintains specified on-resistance and leakage performance across this entire range, as confirmed in the Absolute Maximum Ratings and Specification tables of Vishay Document Number 71616.
Does the DG221BDY-T1 require external level-shifting circuitry for TTL-compatible control?
No, the DG221BDY-T1 does not require external level-shifting circuitry for TTL-compatible control. Its integrated 5 V on-chip regulator ensures logic thresholds (VINH ≥ 2.4 V, VINL ≤ 0.8 V) remain stable across its full analog supply range (V+ up to +15 V, V− down to −15 V). This feature is explicitly documented in the FEATURES and APPLICATION HINTS sections of the DG221BDY-T1 datasheet (Document Number 71616).
How does the WR pin function in the DG221BDY-T1, and what happens when it is held high?
The WR (Write) pin in the DG221BDY-T1 acts as a latch enable: when WR is low, the states of IN1–IN4 directly control the four switches; when WR goes high, the current INx states are latched and retained regardless of subsequent INx changes. Holding WR high maintains the last latched configuration - a behavior confirmed in the TRUTH TABLE and DESCRIPTION sections of the DG221BDY-T1 datasheet (Rev. B, 11-Feb-08).
What is the maximum continuous current rating per switch in the DG221BDY-T1?
The DG221BDY-T1 supports a maximum continuous current of 20 mA per switch (S or D terminal), as specified in the ABSOLUTE MAXIMUM RATINGS table of its datasheet (Document Number 71616). This rating applies under normal operating conditions with proper thermal derating above 25 °C (6.5 mW/°C) and above 75 °C (7.7 mW/°C), and is validated across the full –40 °C to +85 °C temperature range.
Is the DG221BDY-T1 pin-compatible with the DG221BDJ (DIP package) version?
Yes, the DG221BDY-T1 (SOIC-16) and DG221BDJ (16-pin plastic DIP) share identical pin functions and electrical specifications, differing only in package type and mechanical dimensions. The Pin Configuration diagram and FUNCTIONAL BLOCK DIAGRAM in Document Number 71616 confirm identical pin numbering and roles across both packages, making them functionally interchangeable in designs where board layout accommodates the respective footprints.
DG221BDY-T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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-T1 FAQ
1.How can I place an order for DG221BDY-T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for DG221BDY-T1 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-T1 reliable?
The price and inventory of DG221BDY-T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DG221BDY-T1 is usually 5 days.
3.What payment methods are accepted for DG221BDY-T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DG221BDY-T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DG221BDY-T1?
DG221BDY-T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DG221BDY-T1 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-T1?
For technical support, including DG221BDY-T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DG221BDY-T1 requirements.
6.How does Aetrix verify that DG221BDY-T1 is sourced from the original manufacturer or authorized distributors?
All DG221BDY-T1 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-T1 meets industry standards.
7.What is the process for return or replacement of DG221BDY-T1?
All DG221BDY-T1 units undergo pre-shipment inspection (PSI). If there is an issue with DG221BDY-T1, 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-T1 part is unused and in its original packaging.
Return procedure for DG221BDY-T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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