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Vishay Siliconix DG308BDQ
- Part No.:
- DG308BDQ
- Manufacturer:
- Vishay Siliconix
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
DG308BDQ.pdf
- Description:
- IC SW SPST-NOX4 85OHM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,022
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Product details
Overview
DG308BDQ from Vishay Siliconix is a quad single-pole single-throw (SPST) normally open analog switch fabricated in silicon-gate CMOS technology, rated for ±22 V dual-supply operation, with 45 Ω typical on-resistance, <200 ns turn-on time, and 1 pC charge injection - used in precision sample-and-hold circuits and programmable gain amplifiers.
For engineers reviewing the DG308BDQ datasheet, DG308BDQ pinout, DG308BDQ application, or DG308BDQ equivalent, key selection criteria include guaranteed ±22 V analog signal range, low leakage (<20 pA), bi-directional signal handling, TSSOP-16 package compatibility, and logic-level compatibility with 3.5 V low / 11 V high thresholds.
Technical Context
The DG308BDQ implements four independent SPST switches with true bi-directional conduction when on and rail-to-rail blocking when off, supported by an epitaxial layer to prevent latchup. Its improved charge injection compensation minimizes switching transients during analog signal routing.
It operates across -40 °C to +85 °C with ±4 V to ±22 V dual-supply or +4 V to +44 V single-supply ranges, and features CMOS-compatible digital inputs requiring VINL ≤ 3.5 V and VINH ≥ 11 V for reliable control under full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Signal Range | ±15 V (guaranteed); supports full-scale bipolar signals without clipping in ±15 V systems |
| On-Resistance (RDS(on)) | 45 Ω typ. at ±15 V supplies; enables <0.1% gain error in 10 kΩ impedance paths |
| Charge Injection | 1 pC typ.; limits voltage glitch to <1 mV on 1 nF hold capacitors |
| Turn-On Time (tON) | <200 ns; supports sampling rates up to 2.5 MHz in fast data acquisition |
| Off-Leakage Current | ±20 pA max. at ±14 V; ensures <1 µV/s droop in 1 µF hold capacitors |
| Supply Voltage Range | ±4 V to ±22 V dual; allows direct interface with legacy ±15 V instrumentation rails |
| Logic Thresholds | VINL ≤ 3.5 V, VINH ≥ 11 V; compatible with TTL and discrete logic level-shifting |
Pinout & Package
TSSOP-16 package (JEDEC MO-153, Vishay Doc. 74417), 4.4 mm × 5.0 mm footprint, 0.65 mm pitch, 1.2 mm max height, lead-free per RoHS (suffix -E3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 (IN1–IN4) | Digital control input | Active-high logic: logic "1" (≥11 V) closes corresponding switch |
| 5, 6, 11, 12 (S1–S4) | Source terminal | Bi-directional analog path input/output; connects to signal source in SPST configuration |
| 7, 8, 15, 16 (D1–D4) | Drain terminal | Bi-directional analog path input/output; connects to load or next stage |
| 9 (GND) | Ground reference | Logic ground return; must be tied to system digital ground |
| 10 (V−) | Negative supply rail | Bias for analog channel; sets lower bound of signal range (e.g., −15 V) |
| 14 (V+) | Positive supply rail | Bias for analog channel; sets upper bound of signal range (e.g., +15 V) |
| 13 (NC) | No connect | Internally unconnected; must remain floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| ±22 V supply rating | Enables direct interfacing with industrial ±20 V sensor outputs and legacy test equipment rails |
| 45 Ω on-resistance | Reduces insertion loss and nonlinearity in precision DC-coupled signal paths |
| 1 pC charge injection | Minimizes aperture error in sample-and-hold stages using sub-1 nF hold capacitors |
| Bi-directional analog path | Supports flexible signal routing without polarity constraints in multiplexer or matrix applications |
| Latchup-immune design | Epitaxial layer prevents destructive latchup under overvoltage or ESD stress conditions |
Applications
| Precision Sample-and-Hold Circuits | Digitally Programmable Gain Amplifiers |
|---|---|
Use Scenario: Capturing fast transient analog waveforms in automated test equipment with sub-microsecond aperture time. IC Role / Device Role / Timing Role: DG308BDQ acts as the acquisition switch, enabling precise timing-controlled connection between input and hold capacitor. Use Value: 1 pC charge injection and <200 ns tON ensure <5 mV sample-to-hold offset and <25 µs acquisition time as verified in Figure 7. | Use Scenario: Selecting feedback resistor values in op-amp-based instrumentation amplifiers to achieve discrete gain steps (x1, x10, x100, x1000). IC Role / Device Role / Timing Role: DG308BDQ serves as digitally controlled resistor network selector, isolating unused gain paths. Use Value: 45 Ω RDS(on) contributes <0.5% gain error in 10 kΩ feedback paths; low leakage preserves DC accuracy over time. |
| Industrial Data Acquisition Front-Ends | Communications Channel Switching |
Use Scenario: Multiplexing multiple ±10 V sensor outputs (e.g., thermocouples, strain gauges) into a shared ADC channel in PLC modules. IC Role / Device Role / Timing Role: DG308BDQ functions as a rail-to-rail analog multiplexer front-end, handling bipolar signals without level-shifting. Use Value: ±22 V rating accommodates ±15 V sensor excitation and overvoltage margin; 90 dB off-isolation prevents crosstalk between channels. | Use Scenario: Routing differential analog signals between RF modulator/demodulator ICs and baseband filters in multi-band transceivers. IC Role / Device Role / Timing Role: DG308BDQ provides low-distortion signal path selection in IF/RF signal chains operating up to 100 kHz. Use Value: 95 dB channel-to-channel crosstalk and 90 dB off-isolation maintain signal integrity in adjacent channel switching. |
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 (2.7 V to 12 V); 60 Ω RDS(on); 0.5 pC charge injection; SOIC-16 | Not suitable for ±15 V systems; better for battery-powered portable instruments | Select when single-supply operation and ultra-low charge injection outweigh bipolar rail support |
| ADG1404BRUZ | ±15 V rated; 4.7 Ω RDS(on); 25 pC charge injection; TSSOP-16; requires 1.8 V logic | Lower on-resistance but higher charge injection; incompatible with 3.5 V/11 V logic thresholds | Select when lowest on-resistance is critical and logic interface can be adapted |
Compared with MAX4617ESE+ and ADG1404BRUZ, the DG308BDQ uniquely balances ±22 V operation, 45 Ω on-resistance, and 1 pC charge injection in a drop-in TSSOP-16 package - making it optimal for legacy industrial systems requiring rail-to-rail analog switching without redesigning power or logic interfaces.
Availability
DG308BDQ is available at Aetrix Electronics and suitable for industrial instrumentation, test equipment, and communications systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for DG308BDQ 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 leadership in power MOSFETs, diodes, optoelectronics, and precision analog switches.
The DG308BDQ belongs to Vishay's DG308B/DG309B family of improved quad CMOS analog switches, designed specifically for high-accuracy, wide-voltage-range signal routing in industrial and test instrumentation where reliability and rail-to-rail performance are critical.
FAQ
What is the maximum analog signal voltage the DG308BDQ can handle?
The DG308BDQ supports analog signals from V− to V+, with absolute maximum ratings of ±22 V across V+ to V−. Under normal operation with ±15 V supplies, it reliably passes ±15 V signals without clipping or distortion, as confirmed in the specification table on page 3 of Document 70047. This makes DG308BDQ suitable for legacy industrial systems using ±15 V rails.
Does the DG308BDQ require dual supplies, or can it operate from a single supply?
The DG308BDQ supports both dual-supply (±4 V to ±22 V) and single-supply (4 V to 44 V) operation. In single-supply mode with V− = 0 V and V+ = 12 V, its analog signal range is 0 V to 12 V, and RDS(on) increases to 90 Ω typical - verified in the single-supply specifications section (page 4, Document 70047). DG308BDQ maintains full functionality in either configuration.
What logic voltage levels are required to drive the DG308BDQ control inputs?
The DG308BDQ requires VINL ≤ 3.5 V for logic low and VINH ≥ 11 V for logic high across the full −40 °C to +85 °C temperature range. These thresholds are explicitly defined in the Digital Control section (page 3, Document 70047) and ensure robust noise immunity in noisy industrial environments. DG308BDQ is not compatible with standard 3.3 V or 5 V logic without level-shifting.
Is the DG308BDQ pin-compatible with the older DG308A or DG309 series?
Yes - the DG308BDQ shares identical pinout and package dimensions with DG308A/DG309 in TSSOP-16, as confirmed by the functional block diagram and ordering table in Document 70047. It is a direct performance upgrade: DG308BDQ improves on-resistance (45 Ω vs. 65 Ω), leakage (20 pA vs. 100 pA), and switching speed (<200 ns vs. <300 ns) while maintaining full pin-to-pin compatibility.
What is the thermal derating behavior of the DG308BDQ in TSSOP-16 package?
In TSSOP-16 package, the DG308BDQ has a power dissipation limit of 640 mW at 75 °C ambient, with linear derating of 7.6 mW/°C above that temperature (per Absolute Maximum Ratings table, page 2, Document 70047). At 105 °C ambient, usable power drops to ~400 mW. This derating applies regardless of supply configuration and must be accounted for in high-density PCB layouts.
DG308BDQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Siliconix
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Circuit:
- SPST - NO
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Number of Circuits:
- 4
- On-State Resistance (Max):
- 85Ohm
- Channel-to-Channel Matching (ΔRon):
- 1.7Ohm
- Voltage - Supply, Single (V+):
- 4V ~ 44V
- Voltage - Supply, Dual (V±):
- ±4V ~ 22V
- Switch Time (Ton, Toff) (Max):
- 200ns, 150ns
- -3db Bandwidth:
- -
- Charge Injection:
- 1pC
- Channel Capacitance (CS(off), CD(off)):
- 5pF, 5pF
- Current - Leakage (IS(off)) (Max):
- 500pA
- Crosstalk:
- -95dB @ 100kHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
DG308BDQ FAQ
1.How can I place an order for DG308BDQ through Aetrix?
Please submit a Request for Quotation (RFQ) for DG308BDQ 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 DG308BDQ reliable?
The price and inventory of DG308BDQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DG308BDQ is usually 5 days.
3.What payment methods are accepted for DG308BDQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DG308BDQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DG308BDQ?
DG308BDQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DG308BDQ 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 DG308BDQ?
For technical support, including DG308BDQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DG308BDQ requirements.
6.How does Aetrix verify that DG308BDQ is sourced from the original manufacturer or authorized distributors?
All DG308BDQ 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 DG308BDQ meets industry standards.
7.What is the process for return or replacement of DG308BDQ?
All DG308BDQ units undergo pre-shipment inspection (PSI). If there is an issue with DG308BDQ, 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 DG308BDQ part is unused and in its original packaging.
Return procedure for DG308BDQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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