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Analog Devices Inc./Maxim Integrated DG421DY+
- Part No.:
- DG421DY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DG421DY+.pdf
- Description:
- IC SWITCH SPST-NOX2 35OHM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,888
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Product details
Overview
DG421DY+ from Maxim Integrated is a precision dual SPST CMOS analog switch with latchable TTL/CMOS-compatible control inputs, 20Ω typical on-resistance, 15pC max charge injection, and rail-to-rail signal handling from ±4.5V to ±20V or +10V to +30V supplies. It operates in battery-powered test equipment and audio routing systems requiring low leakage (<5nA at +85°C) and fast switching (175ns tON).
For engineers reviewing the DG421DY+ datasheet, DG421DY+ pinout, DG421DY+ application, or DG421DY+ equivalent, key selection criteria include guaranteed on-resistance matching (3Ω max), latch timing (tWW = 200ns), off-isolation rejection ratio (12dB), and compatibility with microprocessor-controlled analog signal paths.
Technical Context
The DG421DY+ implements two independent single-pole/single-throw switches with separate write (WR) and reset (RS) latches, enabling transparent or stored logic control of S1/D1 and S2/D2 paths. Its silicon-gate 44V process ensures rail-to-rail analog conduction and ESD tolerance ≥2000V per Method 3015.7.
Switch operation is defined by a truth table where WR = 0 and RS = 1 enables latch transparency, while WR = 1 captures IN1/IN2 state to hold switch position. Analog signal range spans V− to V+, with on-resistance flatness (4Ω max) and matching (3Ω max) guaranteed only under bipolar supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-resistance (rDS(ON)) | 20Ω typical, 35Ω max - ensures minimal signal attenuation and voltage drop across switched paths. |
| On-resistance match | 3Ω max - guarantees matched gain/attenuation in differential or dual-channel signal paths. |
| Charge injection | 15pC max - limits transient voltage spikes during switching in sample-and-hold or precision ADC front-ends. |
| Off-leakage current | <5nA at +85°C - preserves signal integrity in high-impedance sensor or battery-monitoring circuits. |
| Switching time (tON/tOFF) | 175ns / 145ns - supports high-speed multiplexing in modems and communication test gear. |
| Supply range | ±4.5V to ±20V or +10V to +30V - enables flexible power architecture in industrial and military systems. |
| Rail-to-rail signal range | V− to V+ - allows full utilization of supply rails without clipping in audio or instrumentation applications. |
Pinout & Package
DG421DY+ is housed in a 16-pin SOIC package (JEDEC MS-012AC, 7.5mm × 10.3mm body, 1.27mm pitch). Pin 1 is S1; pin 8 is D2; pins 3, 4, 5, and 6 are no-connect; pin 13 is GND; pin 14 is V−; pin 11 is V+; pin 12 is VL (logic supply); pins 10 and 15 are IN1 and IN2; pins 2 and 7 are WR and RS respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S1, S2 | Source terminals | Analog input nodes for SPST switching; bidirectional conduction with symmetric on-resistance. |
| D1, D2 | Drain terminals | Analog output nodes; electrically identical to sources, supporting true bidirectional signal flow. |
| IN1, IN2 | Control inputs | TTL/CMOS-compatible logic signals (0.8V/2.4V thresholds) that drive internal latches when WR is active. |
| WR | Write select | Active-high latch enable: samples IN1/IN2 and updates switch states synchronously. |
| RS | Reset select | Active-high global reset: forces both switches OFF regardless of IN state when WR = 0. |
| V+, V− | Analog power rails | Define full analog signal range (V− to V+); support bipolar or single-supply operation. |
| VL | Logic supply | +5V reference for input threshold and latch circuitry; must be tied to +5V for TTL compatibility. |
| GND | Ground reference | Common return for logic and substrate; isolated from analog signal path to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Latchable digital interface | WR/RS control enables microprocessor-driven state retention without continuous bus polling. |
| Rail-to-rail analog conduction | Signals from V− to V+ pass unclipped, preserving dynamic range in audio and sensor interfaces. |
| Guaranteed on-resistance flatness | 4Ω max variation across full signal range ensures linear gain response in precision instrumentation. |
| Low charge injection | 15pC max minimizes settling error in sample-and-hold circuits and data acquisition front-ends. |
| ESD robustness | 2000V min per Method 3015.7 reduces field failure risk in handling and system integration. |
Applications
| Audio Signal Routing | Test Equipment Multiplexing |
|---|---|
Use Scenario: Switching line-level analog audio between multiple inputs (mic, instrument, playback) in portable mixers or conferencing systems. IC Role / Device Role / Timing Role: Dual SPST analog switch providing isolated, low-distortion signal path selection with latch retention between user commands. Use Value: 20Ω on-resistance and 15pC charge injection prevent audible clicks and preserve frequency response up to 20kHz. | Use Scenario: Routing calibration signals and DUT outputs in automated test equipment with microcontroller-based sequencing. IC Role / Device Role / Timing Role: Latch-controlled analog switch enabling deterministic signal path configuration without real-time bus arbitration. Use Value: 175ns tON and 3Ω on-resistance matching ensure precise timing alignment and amplitude consistency across test channels. |
| Modem Data Channel Switching | Battery-Operated Sensor Interface |
Use Scenario: Selecting between voiceband and data transmission paths in fax/modem hybrids operating from ±12V supplies. IC Role / Device Role / Timing Role: Dual SPST switch managing analog front-end signal routing under microprocessor command with power-down capability. Use Value: 35µW max power consumption and ±4.5V minimum supply extend runtime in mains-independent deployments. | Use Scenario: Connecting multiple high-impedance sensors (thermocouples, pH electrodes) to a shared ADC in portable environmental monitors. IC Role / Device Role / Timing Role: Low-leakage analog switch isolating inactive sensor inputs to prevent loading and cross-talk. Use Value: <5nA off-leakage at +85°C maintains measurement accuracy in thermally demanding field environments. |
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 (+2.7V to +12V), 35Ω max rDS(ON), no latch, 30ns faster tON | Not suitable for bipolar supply systems or microprocessor latch retention requirements | Select when ultra-low voltage operation and speed outweigh latch functionality and supply flexibility. |
| ADG1419BRUZ | SPDT topology, 1.3Ω max rDS(ON), ±15V supply, no latch, 125ns tON | Requires external logic for SPST emulation; lacks WR/RS control for state retention | Choose for ultra-low on-resistance in precision instrumentation where latch is managed externally. |
Compared with MAX4617ESE+ and ADG1419BRUZ, DG421DY+ uniquely combines latchable control, bipolar/single-supply operation, and guaranteed on-resistance matching-making it optimal for microprocessor-coordinated analog routing in rugged, wide-voltage industrial systems.
Availability
DG421DY+ is available at Aetrix Electronics and suitable for test equipment multiplexing, audio signal routing, and battery-operated sensor interfaces requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for DG421DY+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, automotive, and communications markets, with emphasis on reliability and performance under extreme conditions.
The DG421DY+ belongs to Maxim's legacy DG42x family of latch-equipped CMOS analog switches, engineered specifically for microprocessor-interfaced signal routing in battery-powered and high-reliability systems.
FAQ
What is the maximum allowable supply voltage for DG421DY+?
The DG421DY+ supports absolute maximum ratings of V+ = 44V referenced to V−, with operational ranges of ±4.5V to ±20V (bipolar) or +10V to +30V (single supply). Exceeding these limits risks permanent damage due to internal diode clamping and junction breakdown. Always observe derating curves for power dissipation above +70°C ambient.
Does DG421DY+ require a separate logic supply voltage?
Yes, DG421DY+ requires VL = +5V for TTL-compatible input thresholds (VINH ≥ 2.4V, VINL ≤ 0.8V). If VL is tied to V+ or another voltage, the device operates at CMOS logic levels, which may affect microprocessor interface compatibility. The VL pin powers internal latch circuitry and must remain stable during switching transitions.
How does the latch function work in DG421DY+?
The DG421DY+ uses WR (write) and RS (reset) pins to control latch behavior: when WR = 1, IN1/IN2 values are captured and held to maintain switch states after WR returns low; when RS = 1 and WR = 0, both switches force OFF regardless of IN state. This eliminates need for continuous bus activity during static signal routing.
Can DG421DY+ be used with single-ended analog signals?
Yes, DG421DY+ handles single-ended signals across its full rail-to-rail range (V− to V+). Its bidirectional S/D terminals allow either side to serve as input or output. For optimal performance, ensure analog signal swing remains within V− and V+, and maintain proper supply sequencing (V+ first, then VL, then V−) to avoid overvoltage stress on internal protection diodes.
What is the thermal performance of DG421DY+ in SOIC package?
In its 16-pin SOIC package, DG421DY+ has a thermal resistance θJA of 125°C/W. At maximum rated power dissipation (842mW for DIP-equivalent derating), junction temperature rise is ~105°C above ambient. For continuous operation at +85°C ambient, power dissipation should be limited to ≤330mW to keep TJ ≤ +125°C, consistent with its −40°C to +85°C specified operating range.
DG421DY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Circuit:
- SPST - NO
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 35Ohm
- Channel-to-Channel Matching (ΔRon):
- 3Ohm (Max)
- Voltage - Supply, Single (V+):
- 10V ~ 30V
- Voltage - Supply, Dual (V±):
- ±4.5V ~ 20V
- Switch Time (Ton, Toff) (Max):
- 250ns, 200ns
- -3db Bandwidth:
- -
- Charge Injection:
- 10pC
- Channel Capacitance (CS(off), CD(off)):
- 12pF, 12pF
- Current - Leakage (IS(off)) (Max):
- 500pA
- Crosstalk:
- -90dB @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
DG421DY+ FAQ
1.How can I place an order for DG421DY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DG421DY+ 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 DG421DY+ reliable?
The price and inventory of DG421DY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DG421DY+ is usually 5 days.
3.What payment methods are accepted for DG421DY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DG421DY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DG421DY+?
DG421DY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DG421DY+ 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 DG421DY+?
For technical support, including DG421DY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DG421DY+ requirements.
6.How does Aetrix verify that DG421DY+ is sourced from the original manufacturer or authorized distributors?
All DG421DY+ 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 DG421DY+ meets industry standards.
7.What is the process for return or replacement of DG421DY+?
All DG421DY+ units undergo pre-shipment inspection (PSI). If there is an issue with DG421DY+, 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 DG421DY+ part is unused and in its original packaging.
Return procedure for DG421DY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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