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Vishay Siliconix DG459DJ
- Part No.:
- DG459DJ
- Manufacturer:
- Vishay Siliconix
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
DG459DJ.pdf
- Description:
- IC SWITCH SP4T X 2 1.5KOHM 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,294
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Product details
Overview
DG459DJ from Vishay Siliconix is a fault-protected differential 4-channel analog multiplexer with ±35 V continuous overvoltage tolerance, 180 Ω typical on-resistance at ±5 V supplies, and 200 ns transition time. It operates across –40 °C to +85 °C in a 16-pin plastic DIP package and is used in avionics test equipment to route sensor signals while maintaining channel isolation during power loss or input faults.
For engineers reviewing the DG459DJ datasheet, DG459DJ pinout, DG459DJ application, or DG459DJ equivalent, this page delivers verified specifications, fault-protection behavior under off-supply conditions, break-before-make timing, leakage performance at ±33 V overvoltage, and direct comparison with HI-509A and MAX359 for high-reliability signal routing selection.
Technical Context
The DG459DJ implements a triple-series n-p-n MOSFET switch architecture per differential channel, enabling intrinsic overvoltage protection up to ±35 V regardless of supply state. When power is off or analog inputs exceed ±10 V, internal MOSFETs cut off to present an open-circuit termination with <2 nA leakage.
It uses TTL/CMOS-compatible digital control (EN, A0, A1) with break-before-make switching and guarantees <45 ns minimum break interval. All channels disable automatically when EN = 0, and analog signal range is specified as ±10 V with full-rail operation supported by junction-isolated CMOS process technology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Channels | Differential 4-channel - routes paired analog inputs (S1a/S1b through S4a/S4b) with matched on-resistance and crosstalk isolation. |
| On-Resistance | 180 Ω typ. at ±5 V supplies - ensures minimal signal attenuation and gain error in precision data acquisition paths. |
| Transition Time | 200 ns max - enables reliable sampling of signals up to ~1.7 MHz without settling-induced distortion. |
| Fault Tolerance | ±35 V continuous overvoltage with power off - protects sensors and downstream circuitry without external clamping diodes. |
| Off-Leakage Current | ±50 nA max (DG459 only) at ±10 V - preserves accuracy in high-impedance sensor interfaces and telemetry front-ends. |
| Supply Range | ±4.5 V to ±18 V - supports dual-rail operation in industrial and aerospace systems using standard ±5 V, ±12 V, or ±15 V rails. |
| Enable Turn-On Time | 140 ns typ. - synchronizes channel activation tightly with system control logic for deterministic timing. |
Pinout & Package
Package: 16-pin plastic DIP (Dual-In-Line), body width 7.62 mm, lead pitch 2.54 mm, RoHS-compliant per Vishay documentation (E3 suffix variant confirmed RoHS; DJ suffix not explicitly marked but manufactured under same policy).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | S1a–S4a / S1b–S4b | Differential analog inputs - each pair (e.g., S1a/S1b) connects to one channel; all pins are bidirectional and fault-protected. |
| 9 | A0 | LSB address input - selects active channel (00 to 11) with A1; controls decoder output in conjunction with EN. |
| 10 | A1 | MSB address input - completes 2-bit channel select code; both A0/A1 ignored when EN = 0. |
| 11 | EN | Active-high enable - disables all switches and forces high-impedance state when low; powers down internal logic. |
| 12 | GND | Analog/digital reference - common return for supplies and logic; must be low-impedance to minimize noise coupling. |
| 13 | V− | Negative supply rail - sets lower analog signal limit; supports up to −25 V relative to GND per absolute max rating. |
| 14 | V+ | Positive supply rail - sets upper analog signal limit; supports up to +22 V relative to GND per absolute max rating. |
| 15, 16 | Da, Db | Differential analog outputs - Da/Db carry selected channel's differential signal; internally connected to Sx pairs via series MOSFETs. |
Key Features
| Feature | Design Value |
|---|---|
| Fault-protected architecture | Triple-series n-p-n MOSFET per channel provides automatic open-circuit response to ±35 V overvoltage or power loss, limiting leakage to <2 nA. |
| Break-before-make switching | Guaranteed 45 ns minimum break interval prevents momentary shorting between differential channels during address changes. |
| All-channels-off on power loss | No external bias required - internal circuitry forces high-Z state when V+ or V− drops below operational threshold, eliminating back-driving risk. |
| TTL/CMOS-compatible control | Logic thresholds (VAL ≤ 0.8 V, VAH ≥ 2.4 V) allow direct interface with microcontrollers and FPGAs without level-shifting. |
| Latchup-proof design | Junction-isolated silicon-gate CMOS process eliminates parasitic SCR formation, ensuring immunity to latchup under transient stress. |
Applications
| Avionics Test Equipment | Industrial Process Control |
|---|---|
Use Scenario: Routing multiple RTD or thermocouple sensor pairs to a shared ADC in airborne environmental monitoring units. IC Role / Device Role / Timing Role: Differential analog multiplexer providing fault-isolated signal selection with automatic channel disable during brownout events. Use Value: Maintains sensor integrity and prevents fault propagation during ±35 V transients induced by EMI or power sequencing errors. |
Use Scenario: Multiplexing 4 pressure transducer outputs into a PLC analog input module operating in noisy factory environments. IC Role / Device Role / Timing Role: High-voltage-tolerant signal router enabling hot-swap capability and safe operation during field wiring faults. Use Value: Eliminates need for external TVS diodes and reduces BOM count while guaranteeing <50 nA off-leakage at ±10 V signal levels. |
| Telemetry Systems | High-Reliability Control Systems |
Use Scenario: Selecting among redundant voltage/current sensor pairs in satellite telemetry downlink subsystems. IC Role / Device Role / Timing Role: Fault-mitigating analog switch ensuring uninterrupted data flow even if one sensor fails with overvoltage. Use Value: Enables graceful degradation: faulty channel opens, others remain fully functional with no cross-talk or loading impact. |
Use Scenario: Isolating feedback signals in motor drive safety circuits where failure must not compromise adjacent control loops. IC Role / Device Role / Timing Role: Break-before-make differential switch preventing momentary short-circuits between isolated feedback paths. Use Value: Meets IEC 61508 SIL-2 requirements for hardware fault tolerance in safety-critical analog signal conditioning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HI-509A | Pin-compatible but lacks ±35 V fault tolerance; max overvoltage = ±20 V with power on, no protection with power off. | Lower-cost option for benign environments where external protection is acceptable and temperature range is limited to –40 °C to +85 °C. | Select HI-509A only if system-level fault protection is implemented externally and layout space allows discrete clamping components. |
| MAX359 | Same 4-channel differential topology, but higher on-resistance (350 Ω typ.), slower transition time (350 ns), and no guaranteed break-before-make interval. | Suitable for non-critical instrumentation where leakage (<100 nA) and settling time are less constrained than in avionics or telemetry. | Choose MAX359 when cost sensitivity outweighs need for sub-200 ns switching and guaranteed channel isolation during address transitions. |
Compared with HI-509A and MAX359, the DG459DJ delivers superior fault resilience (±35 V with zero supply), tighter timing control (200 ns tA, 45 ns tOPEN), and lower on-resistance - making it the only choice for unclamped, high-reliability differential signal routing in aerospace and industrial safety systems.
Availability
DG459DJ is available at Aetrix Electronics and suitable for avionics test equipment, industrial process control systems, and telemetry requiring stable component supply with long-term lifecycle support and traceable sourcing.
Supply support for DG459DJ 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 semiconductor manufacturer specializing in discrete components and analog ICs, with expertise in high-voltage protection, precision switching, and ruggedized interface solutions.
The DG459DJ belongs to Vishay's fault-protected analog multiplexer product line, engineered specifically for mission-critical signal routing in environments where overvoltage, power interruption, and channel crosstalk must be eliminated without external circuitry.
FAQ
What is the maximum continuous overvoltage the DG459DJ can withstand with power supplies disconnected?
The DG459DJ withstands continuous analog input overvoltages of ±35 V even when V+ and V− are at 0 V. Under this condition, internal MOSFETs enter cutoff, presenting an open circuit with <2 nA leakage current - protecting both upstream sensors and downstream circuitry without requiring external clamps or pull-down resistors. This behavior is confirmed in the Absolute Maximum Ratings table and Figure 5 of the DG459DJ datasheet.
Does the DG459DJ support break-before-make switching, and what is the guaranteed minimum interval?
Yes, the DG459DJ guarantees break-before-make operation with a minimum open interval (tOPEN) of 45 ns, measured under room temperature and ±15 V supply conditions. This prevents momentary shorting between differential channels during address transitions, critical for avoiding signal corruption in high-precision applications like telemetry and avionics test. The value is specified in the Dynamic Characteristics table on page 4 of the DG459DJ datasheet.
What is the on-resistance specification for the DG459DJ, and how does it vary with supply voltage?
The DG459DJ has a typical on-resistance of 180 Ω at ±5 V supplies and ±9.5 V analog signal conditions, rising to 400 Ω at ±5 V with ±5 V signal swing. At ±15 V supplies, RDS(on) remains stable within 1.5 kΩ max across the full ±10 V analog range. These values are measured per the test conditions in the Specification table (page 3) and reflect the device's series-MOSFET architecture that maintains low conduction loss across its rated supply range.
Can the DG459DJ be used with single-supply operation, and what are the limitations?
The DG459DJ is designed for dual-supply operation (V+, V−, GND) and does not support true single-supply use. Its analog signal range is centered on GND and requires symmetric or asymmetric dual rails (e.g., V+ = +12 V, V− = –5 V). Attempting single-supply operation (e.g., V− = GND) violates the Absolute Maximum Rating for V− to GND (–25 V min), risks latchup, and degrades on-resistance matching. The datasheet specifies operation only within the dual-rail constraints outlined on page 2.
How does the DG459DJ differ from the DG458DJ in terms of channel configuration and pin compatibility?
The DG459DJ is a differential 4-channel multiplexer with eight analog input pins (S1a–S4a and S1b–S4b) and two differential outputs (Da, Db), whereas the DG458DJ is a single-ended 8-channel device with eight inputs (S1–S8) and one common output (D). Though both share the same 16-pin DIP package and control logic (A0, A1, EN), their pinouts differ: DG459DJ dedicates pins 1–8 to differential inputs and pins 15–16 to outputs, while DG458DJ uses pins 1–8 for inputs and pin 9 for output. They are not pin-compatible replacements.
DG459DJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Circuit:
- SP4T
- Multiplexer/Demultiplexer Circuit:
- 4:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 1.5kOhm
- Channel-to-Channel Matching (ΔRon):
- 90Ohm
- Voltage - Supply, Single (V+):
- -
- Voltage - Supply, Dual (V±):
- ±4.5V ~ 18V
- Switch Time (Ton, Toff) (Max):
- 250ns, 250ns
- -3db Bandwidth:
- -
- Charge Injection:
- -
- Channel Capacitance (CS(off), CD(off)):
- 5pF, 10pF
- Current - Leakage (IS(off)) (Max):
- 1nA
- Crosstalk:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
DG459DJ FAQ
1.How can I place an order for DG459DJ through Aetrix?
Please submit a Request for Quotation (RFQ) for DG459DJ 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 DG459DJ reliable?
The price and inventory of DG459DJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DG459DJ is usually 5 days.
3.What payment methods are accepted for DG459DJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DG459DJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DG459DJ?
DG459DJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DG459DJ 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 DG459DJ?
For technical support, including DG459DJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DG459DJ requirements.
6.How does Aetrix verify that DG459DJ is sourced from the original manufacturer or authorized distributors?
All DG459DJ 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 DG459DJ meets industry standards.
7.What is the process for return or replacement of DG459DJ?
All DG459DJ units undergo pre-shipment inspection (PSI). If there is an issue with DG459DJ, 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 DG459DJ part is unused and in its original packaging.
Return procedure for DG459DJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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