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DS89C387TMEA
Texas Instruments
IC DRIVER 12/0 48SSOP
1264 Pcs New Original In Stock
12/0 Driver RS422, RS485 48-SSOP
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5.0 / 5.0
- (30 Ratings)
DS89C387TMEA
Product Overview
1346576
DiGi Electronics Part Number
DS89C387TMEA-DGManufacturer
Texas Instruments
DS89C387TMEA
Description
IC DRIVER 12/0 48SSOPInventory
1264 Pcs New Original In Stock
12/0 Driver RS422, RS485 48-SSOP
Quantity
Minimum 1
Minimum 1
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DS89C387TMEA Technical Specifications
Category
Interface, Drivers, Receivers, Transceivers
Packaging
-
Series
-
Product Status
Obsolete
Type
Driver
Protocol
RS422, RS485
Number of Drivers/Receivers
12/0
Duplex
-
Data Rate
-
Voltage - Supply
4.5V ~ 5.5V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
48-BSSOP (0.295", 7.50mm Width)
Supplier Device Package
48-SSOP
Base Product Number
DS89C387
Datasheet & Documents
HTML Datasheet
DS89C387TMEA-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
2156-DS89C387TMEA
TEXTISDS89C387TMEA
Standard Package
29
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
신속한 배송 덕분에 예상보다 훨씬 빠르게 상품을 받아볼 수 있었어요.
de desembre 02, 2025
Jede Lieferung wird sorgfältig geplant und ausgeführt, sodass ich mich immer auf die Pünktlichkeit verlassen kann.
de desembre 02, 2025
Sehr positive Shopping-Erfahrung bei DiGi Electronics. Die Website ist schnell, zuverlässig und bietet gute Preise.
de desembre 02, 2025
Customer satisfaction seems to be their top priority, and it shows.
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Frequently Asked Questions (FAQ)
What are the key risks when replacing the obsolete DS89C387TMEA in an existing RS-485 backplane design, and how can I ensure signal integrity isn’t compromised during the transition?
Replacing the DS89C387TMEA—an obsolete 12-driver RS-485/RS-422 device—requires careful evaluation of timing skew, output current matching, and propagation delay consistency across all 12 channels. A direct drop-in may not exist; consider modern alternatives like the Texas Instruments SN65HVD72 (for lower channel counts) or SN65HVD7512 (12-channel equivalent), but verify that differential output voltage (VOD) and common-mode range meet your backplane’s termination and noise margin requirements. Perform TDR testing on prototype layouts to confirm impedance continuity, especially since the DS89C387TMEA’s 48-SSOP package has specific pin-to-pin capacitance that affects rise times. Always validate with worst-case cable lengths and baud rates used in your system.
Can the DS89C387TMEA still be safely used in new industrial designs despite its obsolete status, given its RoHS non-compliant status and limited supply chain visibility?
Using the DS89C387TMEA in new designs carries significant long-term risks: it is marked obsolete by Texas Instruments, RoHS non-compliant (containing lead), and lacks future production support. While the part is currently in stock (1,157 pcs), this inventory is finite and not replenishable. For new industrial deployments requiring 10+ year lifecycles—especially in EU or medical markets—this creates compliance and sourcing vulnerabilities. Instead, migrate to a REACH-compliant, active alternative such as the SN65HVD7512, which offers similar 12-driver functionality, improved ESD protection (±16 kV HBM), and full RoHS compliance. If you must use existing DS89C387TMEA stock for prototypes or short-lifecycle products, implement strict inventory controls and plan for end-of-life redesign within 12–18 months.
How does the DS89C387TMEA’s lack of fail-safe biasing impact system reliability in multi-drop RS-485 networks, and what external circuitry is needed to prevent bus lockup?
The DS89C387TMEA does not include internal fail-safe biasing, meaning an idle or disconnected RS-485 bus can float into an indeterminate state, causing spurious receiver outputs and potential system lockup. To mitigate this, you must add external biasing resistors: typically a 1.2 kΩ pull-up on the A line and a 1.2 kΩ pull-down on the B line to establish a valid idle-state differential voltage (>200 mV). In noisy industrial environments, also include 120 Ω termination at both ends of the bus. Without this network, the DS89C387TMEA’s receivers may interpret noise as valid data, leading to communication errors—especially critical in safety-monitoring or control systems where deterministic behavior is required.
What layout and thermal considerations are critical when designing a PCB with the DS89C387TMEA in a 48-SSOP package, particularly under continuous full-load operation across its -40°C to 85°C range?
The DS89C387TMEA in a 48-SSOP (7.50 mm width) package has limited thermal dissipation capability due to its modest exposed pad and high channel count (12 drivers). Under continuous full-load operation—especially driving long cables or low-impedance loads—junction temperatures can exceed safe limits even within the rated ambient range. Ensure adequate copper pour under the device connected to ground, use thermal vias to inner/ground planes, and maintain at least 8 mm clearance from heat-sensitive components. Monitor total power dissipation: each driver can source/sink up to 60 mA, so worst-case power = 12 × (5V × 60 mA) = 3.6 W. Without proper thermal management, thermal shutdown or accelerated aging may occur, degrading MTBF in field deployments.
Is the DS89C387TMEA electrically compatible with 3.3V logic systems, and what level-shifting strategy should be used if interfacing with modern microcontrollers?
The DS89C387TMEA requires a 4.5V–5.5V supply and has TTL-compatible inputs with VIH(min) ≈ 2.0V and VIL(max) ≈ 0.8V, making it marginally compatible with 3.3V CMOS outputs—but only if the MCU guarantees high-level output ≥2.4V under load. However, due to voltage margin erosion over temperature and aging, direct connection risks intermittent failures. For reliable operation, use a unidirectional level shifter like the TXB0108 or SN74LVC8T245 between the 3.3V MCU and the DS89C387TMEA’s driver enable/input pins. Avoid bidirectional shifters unless direction control is isolated. This ensures clean signal transitions and protects the DS89C387TMEA from marginal logic thresholds, especially in high-noise environments where signal integrity is already challenged by long RS-485 traces.
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DS89C387TMEA CAD Models
Texas Instruments DS89C387TMEA PCB symbols & footprints
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