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Analog Devices Inc./Maxim Integrated DG421DJ
- Part No.:
- DG421DJ
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
DG421DJ.pdf
- Description:
- IC SW DUAL ANLG CMOS LTCH 16-DIP
- Quantity:
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- Shipping:
Inventory:808
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Product details
Overview
DG421DJ from Maxim Integrated is a precision dual SPST CMOS analog switch with latched TTL/CMOS-compatible control inputs, 20Ω typical on-resistance, 15pC max charge injection, and rail-to-rail signal handling from ±4.5V to ±20V supplies - used in battery-powered test equipment and audio routing where low leakage (<5nA at +85°C) and fast switching (175ns tON) are critical.
For engineers reviewing the DG421DJ datasheet, DG421DJ pinout, DG421DJ application, or DG421DJ equivalent, this page delivers verified electrical specs, latch timing behavior, bipolar/single-supply operating margins, and real-world design implications for sample-and-hold circuits, modems, and PBX systems.
Technical Context
The DG421DJ implements two independent, normally open SPST switches with separate S1/D1 and S2/D2 paths, each controlled by a dedicated input (IN1/IN2) and managed via WR (write) and RS (reset) latch logic. Its silicon-gate 44V process enables true rail-to-rail analog conduction without level-shifting.
Switch operation is fully specified under both bipolar (±4.5V to ±20V) and single-supply (+10V to +30V) conditions, with guaranteed on-resistance matching ≤3Ω and flatness ≤4Ω over the full signal range - parameters validated only under bipolar operation per datasheet Note 4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-resistance (rDS(ON)) | 20Ω typ / 35Ω max - ensures minimal signal attenuation and voltage drop across switched paths at ±15V supplies. |
| On-resistance match | ≤3Ω max - guarantees matched gain/attenuation in differential or dual-channel signal paths. |
| Charge injection | 15pC max - limits voltage glitch on sampled nodes in precision sample-and-hold applications. |
| Off-leakage current | <5nA at +85°C - preserves accuracy in high-impedance sensor interfaces and long-hold capacitors. |
| Supply range | ±4.5V to ±20V bipolar or +10V to +30V single - supports industrial, telecom, and portable designs without external level translation. |
| Switching time (tON/tOFF) | 175ns / 145ns - enables multiplexing of audio and medium-speed data signals with minimal distortion. |
| ESD tolerance | 2000V min (Method 3015.7) - provides robust handling during board assembly and field service. |
Pinout & Package
DG421DJ is supplied in a 16-pin plastic DIP package (0.300" wide), RoHS-compliant, rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | D1, D2 | Drain terminals - bidirectional analog signal outputs; connect to downstream circuitry or load. |
| 2 | WR | Write select - latches IN1/IN2 states on rising edge; enables microprocessor-controlled state retention. |
| 3, 4, 5, 6 | N.C. | No internal connection - must be left unconnected; no pull-up/down or routing required. |
| 7 | RS | Reset select - forces both switches OFF when high; synchronizes state across multiple devices. |
| 9, 16 | S1, S2 | Source terminals - bidirectional analog signal inputs; accept rail-to-rail voltages from V− to V+. |
| 10, 15 | IN1, IN2 | Control inputs - TTL/CMOS-compatible (0.8V/2.4V thresholds); drive switch ON/OFF before latching. |
| 11 | V+ | Positive supply - sets upper analog rail; must be powered first in supply sequencing. |
| 12 | VL | Logic supply - fixed at +5V for TTL compatibility; decoupling recommended near pin. |
| 13 | GND | Ground reference - common return for logic and analog sections; low-impedance path required. |
| 14 | V− | Negative supply - sets lower analog rail; powers internal bias networks and switch transistors. |
Key Features
| Feature | Design Value |
|---|---|
| Latchable digital inputs | WR/RS control eliminates need for continuous µP bus hold; reduces system power and timing overhead. |
| Rail-to-rail signal handling | Supports analog signals from V− to V+ without clipping - essential for ±12V audio and instrumentation front-ends. |
| Guaranteed rDS(ON) flatness | ≤4Ω variation across full signal range - maintains consistent gain in precision gain-switching and calibration paths. |
| Low power consumption | 35µW max - extends battery life in portable test gear and handheld communication devices. |
| Bipolar and single-supply operation | Eliminates need for dual-rail generation in legacy systems while enabling new single-rail designs. |
Applications
| Test Equipment Signal Routing | Modem Analog Front-End |
|---|---|
Use Scenario: Multiplexing sensor inputs into a shared ADC in automated test equipment with strict offset and drift requirements. IC Role / Device Role / Timing Role: Dual SPST switch isolating individual transducer channels; latched control prevents mid-scan state changes. Use Value: 15pC max charge injection and <5nA off-leakage preserve DC accuracy over extended hold times and temperature ranges. | Use Scenario: Selecting between line interface and handset paths in fax/modem hybrid circuits operating from ±12V rails. IC Role / Device Role / Timing Role: Bidirectional analog switch routing voice-band signals (300Hz–3.4kHz) with minimal THD and crosstalk. Use Value: 20Ω on-resistance and 12dB crosstalk rejection ensure clean signal separation without external buffering. |
| PBX Audio Path Switching | Battery-Powered Data Acquisition |
Use Scenario: Configuring conference call paths and ring detection circuits in private branch exchange systems. IC Role / Device Role / Timing Role: SPST switch enabling/disabling audio transformers and hybrid circuits under µP command with state retention. Use Value: WR/RS latching allows stable path configuration during µP sleep cycles, reducing system-level power by >40%. | Use Scenario: Channel selection in portable multimeters or environmental monitors powered by 9V batteries. IC Role / Device Role / Timing Role: Low-power analog switch routing thermocouple, RTD, or voltage inputs to a shared signal chain. Use Value: 35µW max supply current and ±4.5V min bipolar operation extend usable battery life beyond 100 hours per set. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG421BNZ | Higher on-resistance (45Ω max), no latch logic, requires continuous control signals. | Not suitable for µP-bus-retention designs; better for simple GPIO-driven switching. | Select when latch functionality is unnecessary and layout space is constrained (SOIC-16). |
| TSM1014IDR | Single SPST, no latches, 30Ω max rDS(ON), rated only for +3.3V/+5V logic and ≤12V analog swing. | Limited to low-voltage embedded systems; cannot replace DG421DJ in ±15V signal paths. | Choose only for cost-sensitive, low-voltage consumer applications with no bipolar requirement. |
Compared with ADG421BNZ and TSM1014IDR, DG421DJ uniquely combines latch control, bipolar ±20V capability, and sub-5nA leakage - making it irreplaceable in telecom infrastructure and precision test equipment where signal integrity and state retention are non-negotiable.
Availability
DG421DJ is available at Aetrix Electronics and suitable for test equipment, modem design, and PBX systems requiring stable component supply, long-term manufacturability, and guaranteed -40°C to +85°C performance.
Supply support for DG421DJ 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The DG421DJ belongs to Maxim's legacy DG42x family of latch-equipped analog switches, engineered specifically for µP-interfaced instrumentation and telecom systems demanding rail-to-rail fidelity, low leakage, and latch-based state persistence.
FAQ
What is the maximum allowable voltage difference between V+ and V− for DG421DJ?
The absolute maximum voltage difference between V+ and V− for DG421DJ is +44V, as specified in the Absolute Maximum Ratings table. This limit applies regardless of individual rail values - for example, V+ = +25V and V− = −19V yields a 44V differential and remains within rating. Exceeding this stress condition risks permanent device damage.
Does DG421DJ support single-supply operation, and what is the minimum V+ voltage?
Yes, DG421DJ supports single-supply operation from +10V to +30V. The minimum valid V+ is +10V when V− is tied to ground (0V). At this condition, the analog signal range spans 0V to +10V, and all electrical specifications - including on-resistance and leakage - remain valid per the datasheet's single-supply characterization curves.
How does the WR and RS pin interaction affect switch state in DG421DJ?
In DG421DJ, WR latches the logic states of IN1 and IN2 on its rising edge, holding them until the next WR pulse or an RS high assertion. When RS is high, both switches force OFF regardless of IN1/IN2 or WR state. This two-signal latch architecture enables deterministic, glitch-free state control in noisy µP environments - a key differentiator from non-latching alternatives like the ADG421BNZ.
Is VL required to be exactly +5V for DG421DJ to operate correctly?
Yes, VL must be +5V for guaranteed TTL-compatible operation. The datasheet specifies that VINH ≥ 2.4V and VINL ≤ 0.8V thresholds are maintained only when VL = +5V. If VL is tied to V+ (e.g., +15V), the device operates at CMOS logic levels, requiring compatible drivers - but TTL-level µPs will not reliably control DG421DJ unless VL is regulated to +5V.
Can DG421DJ handle analog signals beyond the V+ and V− rails, and what protection exists?
No, DG421DJ cannot safely handle analog signals beyond V+ or below V−. Internal ESD diodes clamp such overvoltages, but forward current must be limited to 30mA per terminal (Absolute Maximum Ratings). For signals exceeding rails - e.g., ±18V with ±15V supplies - external series resistors or blocking diodes (per Figure 1 in the datasheet) are mandatory to prevent damage and maintain specified leakage and on-resistance.
DG421DJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Switch Circuit:
- -
- Multiplexer/Demultiplexer Circuit:
- -
- Number of Circuits:
- -
- On-State Resistance (Max):
- -
- Channel-to-Channel Matching (ΔRon):
- -
- Voltage - Supply, Single (V+):
- -
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- -
- -3db Bandwidth:
- -
- Charge Injection:
- -
- Channel Capacitance (CS(off), CD(off)):
- -
- Current - Leakage (IS(off)) (Max):
- -
- Crosstalk:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
DG421DJ FAQ
1.How can I place an order for DG421DJ through Aetrix?
Please submit a Request for Quotation (RFQ) for DG421DJ 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 DG421DJ reliable?
The price and inventory of DG421DJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DG421DJ is usually 5 days.
3.What payment methods are accepted for DG421DJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DG421DJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DG421DJ?
DG421DJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DG421DJ 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 DG421DJ?
For technical support, including DG421DJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DG421DJ requirements.
6.How does Aetrix verify that DG421DJ is sourced from the original manufacturer or authorized distributors?
All DG421DJ 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 DG421DJ meets industry standards.
7.What is the process for return or replacement of DG421DJ?
All DG421DJ units undergo pre-shipment inspection (PSI). If there is an issue with DG421DJ, 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 DG421DJ part is unused and in its original packaging.
Return procedure for DG421DJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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