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Vishay Siliconix DG221BDJ
- Part No.:
- DG221BDJ
- Manufacturer:
- Vishay Siliconix
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
DG221BDJ.pdf
- Description:
- IC SWITCH SPST-NCX4 90OHM 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,858
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Product details
Overview
DG221BDJ 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 an on-chip 5 V regulator - enabling robust operation in data acquisition and automated test equipment.
For engineers reviewing the DG221BDJ datasheet, DG221BDJ pinout, DG221BDJ application, or DG221BDJ equivalent, key selection criteria include latch-controlled simultaneous switching, bidirectional analog conduction, -40 °C to +85 °C industrial temperature rating, and compatibility with TTL-level digital control buses.
Technical Context
The DG221BDJ implements four independent SPST switches, each with transparent latching controlled by a shared WR (Write) input. Its internal 5 V regulator decouples logic-level tolerance from supply rail variations, supporting stable TTL-compatible operation across ±10 V to ±15 V dual supplies.
Each channel delivers true bidirectional analog conduction with 70 dB off-isolation at 100 kHz and 90 dB interchannel crosstalk. The device uses epitaxial isolation to prevent latchup and supports continuous 20 mA per switch with 135 Ω maximum on-resistance over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Signal Range | ±15 V - supports full-range bipolar signal switching without clipping in instrumentation front-ends |
| rDS(on) Typ. | 60 Ω - enables low insertion loss and minimal gain error in precision attenuator networks |
| Off-Isolation | 70 dB at 100 kHz - ensures high signal integrity when adjacent channels carry different analog sources |
| Turn-On/Off Time | 550 ns / 340 ns - compatible with microprocessor bus timing for real-time channel reconfiguration |
| Charge Injection | 20 pC - limits voltage glitch amplitude in sample-and-hold or multiplexed ADC interfaces |
| Supply Current | 1.5 mA max - supports low-power embedded system integration without thermal derating concerns |
Pinout & Package
Package: 16-pin plastic DIP (JEDEC MS-012), 0.300" wide body, through-hole mountable with 0.100" lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 15, 16 | IN1–IN4 | Digital latch inputs controlling respective switch states; logic-low enables ON state |
| 3, 4, 13, 14 | D1–D4 | Drain terminals - analog output nodes for each SPST switch |
| 5, 6, 11, 12 | S1–S4 | Source terminals - analog input nodes; bidirectional conduction supported |
| 7 | V− | Negative analog supply rail - sets lower bound of analog signal range |
| 8 | V+ | Positive analog supply rail - sets upper bound of analog signal range |
| 9 | GND | Digital ground reference - separate from analog rails to minimize noise coupling |
| 10 | WR | Write enable - latches all INx states simultaneously; high maintains prior state |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 5 V regulator | Enables TTL-compatible logic interface across wide V+/V− supply ranges without external level-shifting |
| Independent latches per channel | Allows memory-mapped I/O addressing as a single byte - simplifies µP firmware for multi-channel control |
| Epitaxial layer construction | Prevents latchup under overvoltage transients up to ±2 V beyond rails - critical for rugged test equipment |
| True bidirectional analog path | Supports signal flow from S→D or D→S with identical rDS(on) and leakage - essential for flexible signal routing |
| Low charge injection (20 pC) | Minimizes sampling error in multiplexed ADC front-ends and precision integrator applications |
Applications
| Automated Test Equipment (ATE) | Data Acquisition Systems |
|---|---|
Use Scenario: Channel multiplexing of sensor signals into a shared ADC with programmable gain scaling. IC Role / Device Role / Timing Role: Quad SPST switch providing isolated analog signal paths under µP control with simultaneous latching. Use Value: Enables 4:1 analog multiplexing with <550 ns channel switching and <20 pC charge injection to preserve measurement accuracy. |
Use Scenario: Programmable attenuation network using resistor ladder switched by DG221BDJ outputs. IC Role / Device Role / Timing Role: Latch-controlled analog switch array selecting discrete feedback resistors in op-amp circuits. Use Value: Delivers precise 0.1× to 0.0001× gain steps with ±15 V signal handling and 70 dB channel isolation. |
| Medical Instrumentation | Factory Automation I/O Modules |
Use Scenario: Isolating ECG electrode inputs during calibration or lead-off detection sequences. IC Role / Device Role / Timing Role: Bidirectional analog switch disconnecting patient-connected nodes while maintaining DC bias integrity. Use Value: Supports safe, low-leakage (<5 nA off-state) disconnection with ±15 V fault tolerance and no latchup risk. |
Use Scenario: Routing analog sensor outputs (4–20 mA, ±10 V) to PLC analog input cards with configurable channel mapping. IC Role / Device Role / Timing Role: Industrial-grade analog switch providing galvanically isolated signal path selection via µP command. Use Value: Handles 20 mA continuous current per channel and operates reliably from -40 °C to +85 °C ambient. |
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 |
|---|---|---|---|
| MAX4617CPN+ | Higher on-resistance (100 Ω typ.), no on-chip regulator, requires external 3.3 V/5 V logic supply | Lacks integrated voltage regulation - demands tighter supply control in mixed-voltage systems | Preferred where board space constraints favor SOIC-16 and external regulation is already present |
| ADG421BNZ | Lower charge injection (15 pC), but higher off-leakage (±20 nA), no latch functionality - requires continuous WR strobing | Requires active µP control for each state change; unsuitable for static memory-mapped I/O | Chosen when ultra-low charge injection dominates over latch convenience in high-speed sampling |
Compared with DG221BDJ, MAX4617CPN+ trades integrated regulation for smaller footprint, while ADG421BNZ sacrifices latch capability for lower switching artifacts - making DG221BDJ optimal for µP-based systems needing byte-wide, static-configurable analog routing.
Availability
DG221BDJ is available at Aetrix Electronics and suitable for automated test equipment, medical instrumentation, and factory automation requiring stable component supply with long-term industrial lifecycle support.
Supply support for DG221BDJ 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 management, and precision sensing solutions.
The DG221BDJ belongs to Vishay's high-performance analog switch product line, engineered for precision signal routing in industrial, test, and medical systems demanding low on-resistance, latch control, and robust rail-to-rail operation.
FAQ
What is the maximum analog signal voltage range supported by the DG221BDJ?
The DG221BDJ supports an analog signal range of ±15 V when operated with V+ = +15 V and V− = −15 V. This full rail-to-rail range is confirmed in the Absolute Maximum Ratings and Specification tables of the official Vishay datasheet (Document Number: 71616). The DG221BDJ maintains functional performance across this range without clamping or distortion, provided input signals remain within (V− − 2 V) to (V+ + 2 V) due to internal diode clamping.
Does the DG221BDJ require external logic-level translation when interfaced with a 3.3 V microcontroller?
No, the DG221BDJ does not require external logic-level translation when used with a 3.3 V microcontroller. Its on-chip 5 V regulator and TTL-compatible input thresholds (VINH ≥ 2.4 V, VINL ≤ 0.8 V) allow direct connection to 3.3 V logic outputs. The DG221BDJ datasheet explicitly states that the internal regulator "allows wide power supply tolerance without affecting TTL compatibility," confirming interoperability with standard 3.3 V and 5 V digital buses.
How does the WR (Write) pin function in the DG221BDJ, and what happens when it is held low continuously?
The WR pin latches the states of all four INx inputs simultaneously. When WR is low, the DG221BDJ operates in transparent mode: each switch turns ON if its corresponding INx is low, and OFF if INx is high. Holding WR low continuously allows the DG221BDJ to behave like a non-latching analog switch - matching the functional behavior of the DG201A/DG201B family as noted in the Applications section of the DG221BDJ datasheet.
Can the DG221BDJ be used in bidirectional analog signal paths, and is performance symmetric between source and drain terminals?
Yes, the DG221BDJ supports true bidirectional analog conduction in the ON state, with symmetric rDS(on), leakage, and capacitance characteristics between source and drain terminals. The datasheet states "the device features true bidirectional performance in the on condition" and specifies identical off-leakage and on-resistance limits for both S and D pins - confirming electrical symmetry required for flexible signal routing in either direction.
What is the thermal derating behavior of the DG221BDJ in its 16-pin DIP package?
The DG221BDJ in the 16-pin plastic DIP package has a power dissipation limit of 470 mW at 25 °C, with linear derating of 6.5 mW/°C above 25 °C. This derating is specified in Note c of the Absolute Maximum Ratings table (Document Number: 71616). At 85 °C ambient, the maximum allowable power dissipation drops to approximately 85 mW - a critical constraint when operating multiple channels near full 20 mA load current.
DG221BDJ 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
DG221BDJ FAQ
1.How can I place an order for DG221BDJ through Aetrix?
Please submit a Request for Quotation (RFQ) for DG221BDJ 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 DG221BDJ reliable?
The price and inventory of DG221BDJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DG221BDJ is usually 5 days.
3.What payment methods are accepted for DG221BDJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DG221BDJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DG221BDJ?
DG221BDJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DG221BDJ 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 DG221BDJ?
For technical support, including DG221BDJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DG221BDJ requirements.
6.How does Aetrix verify that DG221BDJ is sourced from the original manufacturer or authorized distributors?
All DG221BDJ 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 DG221BDJ meets industry standards.
7.What is the process for return or replacement of DG221BDJ?
All DG221BDJ units undergo pre-shipment inspection (PSI). If there is an issue with DG221BDJ, 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 DG221BDJ part is unused and in its original packaging.
Return procedure for DG221BDJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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