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Texas Instruments DS3680DE4
- Part No.:
- DS3680DE4
- Manufacturer:
- Texas Instruments
- Category:
- Telecom
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS3680DE4.pdf
- Description:
- IC TELECOM INTERFACE 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,229
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Product details
Overview
DS3680DE4 from Texas Instruments is a quad telephone relay driver IC designed to interface –48-V relay systems with TTL/CMOS logic in telephony infrastructure. It delivers 50-mA output current per channel from –52-V battery supply, features ±20-V common-mode input range referenced to battery ground, and includes built-in clamp diodes for relay coil transient suppression. It operates across 0°C to 70°C and is used in central office line card relay control.
For engineers reviewing the DS3680DE4 datasheet, DS3680DE4 pinout, DS3680DE4 application, or DS3680DE4 equivalent, key selection criteria include negative-supply relay driving capability, high common-mode input tolerance, fail-safe disconnect behavior, low input current (≤100 µA), and SOIC-14 packaging compatibility with legacy telephony BOMs.
Technical Context
The DS3680DE4 integrates four independent high-side relay drivers, each with complementary differential inputs (IN+, IN–) enabling fail-safe off-state operation when either input opens. Its input stage accepts TTL/CMOS-compatible voltage levels while operating with battery ground as reference - not logic ground - eliminating noise coupling in mixed-ground telecom systems.
Each driver provides active clamping via integrated diodes to suppress inductive kickback up to 5 H relay coils, limits output clamp voltage to ±1.2 V at ±50 mA, and achieves sub-10 µs turn-on/turn-off times under 1-kΩ resistive load conditions. The device draws ≤4.4 mA total battery current when all outputs are on.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | –52 V nominal; supports –10 V to –60 V range for battery drift tolerance in telecom power systems |
| Output Current | 50 mA per channel continuous into inductive relay loads; enables direct drive of standard 50-V, 1-kΩ telephone relays |
| Common-Mode Input Range | ±20 V referenced to BAT GND; accommodates wide-voltage signaling across noisy battery-ground domains |
| Input Compatibility | TTL and CMOS logic levels; high-impedance inputs draw ≤100 µA at VID = 2 V, minimizing loading on upstream logic |
| Output Clamp Voltage | ±0.9 V to ±1.2 V at ±50 mA; protects downstream circuitry from relay coil flyback transients without external diodes |
| Operating Temperature | 0°C to 70°C ambient; qualified for use in central office line cards and indoor telecom equipment enclosures |
| Switching Speed | 1 µs to 10 µs turn-on/turn-off; ensures fast relay actuation compatible with pulse-dial and supervisory signaling |
Pinout & Package
DS3680DE4 is packaged in a 14-pin SOIC (D package), 1.75 mm maximum height, RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating. Pin spacing is 1.27 mm, body width 3.9 mm, and total length 8.75 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 7, 10, 11, 13 | Channel Input Pairs (IN+/IN–) | Differential inputs per driver; complementary logic ensures fail-safe off-state if either terminal opens |
| 3, 6, 9, 12 | Output Terminals (OUT) | High-side open-collector outputs sourcing current from BAT NEG; each drives one relay coil |
| 8 | BAT GND | Battery ground reference for input common-mode range and internal bias; isolated from logic ground |
| 14 | BAT NEG | Negative battery supply rail (–52 V typical); powers all four drivers and supplies relay coil current |
Key Features
| Feature | Design Value |
|---|---|
| Fail-Safe Disconnect | Complementary IN+/IN– inputs force output off upon open-circuit fault - critical for safety-critical relay control in PSTN line cards |
| Built-in Clamp Diode | Integrated reverse-biased diode clamps flyback voltage to ±1.2 V, eliminating need for external snubbers in relay coil paths |
| High Common-Mode Rejection | ±20-V input range relative to BAT GND allows interfacing with diverse signaling sources (e.g., optocouplers, isolated logic) without level-shifting |
| Low Input Current | ≤100 µA high-level input current minimizes loading on TTL/CMOS drivers and reduces power consumption in dense line-card designs |
| Direct Replacement Support | PIN-TO-PIN compatible with National Semiconductor DS3680 and Fairchild µA3680 - enables drop-in upgrade in legacy telecom hardware |
Applications
| Central Office Line Card | Subscriber Line Interface Circuit (SLIC) |
|---|---|
|
Use Scenario: Driving electromechanical relays for loop supervision, battery feed switching, and tip/ring polarity reversal in Class 5 central office line cards. IC Role / Device Role / Timing Role: Quad high-side relay driver providing isolated, fail-safe control of four independent relay functions per IC. Use Value: Eliminates discrete transistor arrays and external clamp diodes, reducing component count by ≥12 parts per line card while maintaining –52-V battery compatibility. |
Use Scenario: Controlling relay-based hybrid circuits and test access points in SLIC modules used in DSLAMs and remote terminals. IC Role / Device Role / Timing Role: Relay interface between digital control logic and analog telephone line circuits, handling both AC and DC signaling paths. Use Value: Enables reliable relay actuation despite large ground potential differences between logic and battery domains, improving system immunity to ground-loop noise. |
| Telecom Test Equipment | Legacy PBX Interface Module |
|
Use Scenario: Automating relay matrix switching in telecom line test sets for continuity, insulation resistance, and signal path verification. IC Role / Device Role / Timing Role: Precision-controlled relay actuator with sub-10 µs response, synchronized to test sequence timing generators. Use Value: Supports rapid reconfiguration of test paths without contact bounce or timing skew - essential for automated production testing throughput. |
Use Scenario: Managing trunk line routing, alarm reporting, and maintenance mode isolation in analog/digital hybrid PBX systems. IC Role / Device Role / Timing Role: Fault-tolerant relay driver ensuring safe de-energization during power loss or control failure. Use Value: Fail-safe disconnect behavior prevents unintended relay closure during brownout or microcontroller reset events - meeting Telcordia GR-1089 safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad negative-supply relay driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS3680D | Identical electrical specs and pinout; same SOIC-14 package but without E4 suffix marking; identical thermal and reliability qualification | No functional difference; DS3680DE4 is TI's enhanced traceability variant with full lot-code marking per JEDEC J-STD-609 | Select DS3680DE4 for full traceability in regulated telecom deployments requiring full material history documentation |
| DS3680N | Same functionality and specs, but in 14-pin PDIP package; higher thermal resistance (9.2 mW/°C derating vs. 7.6 mW/°C for SOIC) | Suitable for prototyping or through-hole assembly; not recommended for high-density surface-mount line cards due to larger footprint and lower power dissipation margin | Choose DS3680N only for hand-soldered evaluation or legacy through-hole designs where SOIC reflow is unavailable |
Compared with DS3680D and DS3680N, the DS3680DE4 offers identical relay-driving performance in a RoHS-compliant SOIC-14 package with enhanced manufacturing traceability - making it the preferred choice for new telecom hardware production where supply chain transparency and surface-mount process compatibility are required.
Availability
DS3680DE4 is available at Aetrix Electronics and suitable for central office line cards, SLIC modules, telecom test equipment, and legacy PBX interface designs requiring stable component supply and long-term obsolescence management.
Supply support for DS3680DE4 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with deep heritage in telecommunications infrastructure ICs since the 1970s.
The DS3680DE4 belongs to TI's legacy telecom interface product line, engineered specifically for robust, fail-safe relay control in –48-V telephone networks - addressing core requirements of reliability, ground isolation, and transient immunity in carrier-grade hardware.
FAQ
What is the function of the BAT GND pin on the DS3680DE4?
The BAT GND pin serves as the reference ground for the DS3680DE4's input stage and internal bias circuitry - not logic ground. It enables the ±20-V common-mode input range relative to battery ground, allowing the DS3680DE4 to accept signals from isolated sources like optocouplers or transformer-coupled logic without level shifting. This separation prevents noise coupling between logic and battery domains in telecom systems.
Can the DS3680DE4 drive relays directly without external components?
Yes, the DS3680DE4 can drive standard 50-V telephone relays directly. Each channel sources up to 50 mA and includes an integrated clamp diode that limits flyback voltage to ±1.2 V at ±50 mA. This eliminates the need for external snubber diodes or transistor buffers - simplifying design and reducing BOM cost in line-card applications using the DS3680DE4.
Is the DS3680DE4 pin-compatible with older versions like the DS3680N?
No - the DS3680DE4 (SOIC-14) and DS3680N (PDIP-14) share identical pin functions but differ in physical package and thermal characteristics. While electrical behavior and pin numbering match, PCB layout must be redesigned to accommodate SOIC vs. PDIP footprints. The DS3680DE4 is not a drop-in replacement for DS3680N on existing through-hole boards without layout revision.
What does the "E4" suffix signify in DS3680DE4?
The "E4" suffix in DS3680DE4 denotes Texas Instruments' enhanced traceability variant: it meets JEDEC J-STD-609 marking requirements with full lot-code identification on the package body. Electrically and functionally identical to DS3680D, the DS3680DE4 provides complete material history tracking - critical for telecom OEMs requiring audit-ready supply chain documentation.
Does the DS3680DE4 support fail-safe operation during input faults?
Yes, the DS3680DE4 implements fail-safe disconnect via complementary IN+ and IN– inputs per channel. If either input opens or becomes disconnected, the differential input condition collapses and forces the output into the off state - preventing unintended relay activation. This behavior is explicitly guaranteed in the DS3680DE4 datasheet and is essential for safety-critical telecom switching applications.
DS3680DE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Function:
- -
- Interface:
- -
- Number of Circuits:
- 4
- Voltage - Supply:
- -
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
DS3680DE4 FAQ
1.How can I place an order for DS3680DE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS3680DE4 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 DS3680DE4 reliable?
The price and inventory of DS3680DE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS3680DE4 is usually 5 days.
3.What payment methods are accepted for DS3680DE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS3680DE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS3680DE4?
DS3680DE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS3680DE4 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 DS3680DE4?
For technical support, including DS3680DE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS3680DE4 requirements.
6.How does Aetrix verify that DS3680DE4 is sourced from the original manufacturer or authorized distributors?
All DS3680DE4 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 DS3680DE4 meets industry standards.
7.What is the process for return or replacement of DS3680DE4?
All DS3680DE4 units undergo pre-shipment inspection (PSI). If there is an issue with DS3680DE4, 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 DS3680DE4 part is unused and in its original packaging.
Return procedure for DS3680DE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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