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Renesas RD6.8MW-T1B-A
- Part No.:
- RD6.8MW-T1B-A
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
RD6.8MW-T1B-A.pdf
- Description:
- RD6.8MW-T1B-A - ZENER DIODES 200
- Quantity:
- Payment:
- Shipping:
Inventory:24,664
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Product details
Overview
RD6.8MW-T1B-A from Renesas Electronics is a 200 mW, 3-pin Mini Mold (SC-59) dual-cathode zener diode with nominal zener voltage 6.8 V, dynamic impedance ≤30 Ω at 5 mA, and maximum reverse surge power 85 W (10 µs pulse). It serves as a precision voltage reference and bidirectional transient suppressor in low-power analog and interface circuits.
For engineers reviewing the RD6.8MW-T1B-A datasheet, RD6.8MW-T1B-A pinout, RD6.8MW-T1B-A application, or RD6.8MW-T1B-A equivalent, this page delivers verified electrical specs, validated SC-59 package mapping, confirmed dual-cathode terminal roles, real-world ESD/clipper use cases, and two field-validated alternative zeners with documented parameter offsets.
Technical Context
This device integrates two independent zener junctions sharing a common anode (Pin 3), enabling symmetrical clamping on both signal polarities - ideal for bidirectional I/O protection. Its 200 mW steady-state dissipation and 85 W peak surge rating support transient suppression without external series resistance in low-energy interfaces.
The RD6.8MW-T1B-A exhibits a temperature coefficient of +0.04 %/°C (typical) and forward voltage drop ≤0.35 V at 5 mA, allowing stable DC biasing and predictable clipping thresholds across –55°C to +150°C ambient range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 6.47–7.14 V @ 5 mA - defines precise clamping threshold for ±6.8 V rail referencing or overvoltage limiting |
| Dynamic Impedance ZZ | ≤30 Ω @ 5 mA - ensures minimal voltage shift under load variation, critical for stable reference accuracy |
| Power Dissipation P | 200 mW @ TA = 25°C - sets continuous thermal limit; derates linearly above 25°C per Fig. 1 |
| Peak Reverse Power PRSM | 85 W @ t = 10 µs - enables single-pulse ESD immunity up to ±15 kV per IEC 61000-4-2 Level 4 |
| Junction Temperature Tj | 150°C max - constrains PCB layout thermal relief and heatsinking requirements |
| Forward Voltage VF | ≤0.35 V @ 5 mA - guarantees low-loss conduction during positive half-cycle clamping |
| Reverse Current IR | ≤5 µA @ VR = 3.5 V - ensures negligible leakage in high-impedance sensing nodes |
Pinout & Package
RD6.8MW-T1B-A uses the SC-59 (EIAJ) 3-pin mini mold package: 2.9 mm × 1.5 mm × 1.1–1.4 mm height, with gull-wing leads and cathode markings K1/K2 on pins 1 and 2 respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (K1) | First Cathode | Connects to zener junction A; forms 6.8 V reverse breakdown path from Pin 3 (Anode) |
| Pin 2 (K2) | Second Cathode | Connects to zener junction B; provides identical 6.8 V breakdown from same Pin 3 Anode |
| Pin 3 (A) | Common Anode | Shared anode node; enables bidirectional clamping: K1→A (negative clamp), K2→A (positive clamp) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-cathode symmetry | Identical VZ (6.47–7.14 V) and ZZ (≤30 Ω) on both K1 and K2 terminals - enables matched bidirectional transient suppression without polarity biasing |
| E24-standard voltage grading | VZ tolerance aligned to E24 resistor series (±5%) - simplifies BOM consolidation and design reuse across 6.2–7.5 V references |
| Low forward voltage | VF ≤ 0.35 V @ 5 mA - minimizes conduction loss in active-clamp or biasing configurations |
| High surge robustness | 85 W peak reverse power (10 µs) - withstands IEC 61000-4-2 contact discharge without degradation |
Applications
| USB 2.0 Data Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting D+ and D− lines against ESD events in embedded USB peripherals. IC Role / Device Role / Timing Role: Bidirectional voltage clamp referenced to ground, leveraging K1 and K2 terminals for symmetric ±6.8 V limiting. Use Value: Prevents latch-up in USB transceivers by clamping transients before they exceed absolute maximum ratings, using only one RD6.8MW-T1B-A per differential pair. | Use Scenario: Stabilizing 5 V supply rails feeding analog sensor front-ends in PLC input modules. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 6.8 V bias for op-amp level-shifting networks. Use Value: Maintains <±1% output stability over –40°C to +85°C due to low tempco (+0.04 %/°C), reducing calibration drift in 16-bit ADC systems. |
| Audio Line Input Clipping | Microcontroller GPIO ESD Guard |
Use Scenario: Hard-limiting line-level audio signals entering codec inputs to prevent ADC saturation. IC Role / Device Role / Timing Role: Waveform clipper using forward conduction (K2→A) and reverse breakdown (K1→A) for symmetrical ±7.15 V clipping. Use Value: Delivers clean zero-crossing distortion with ≤0.35 V forward drop and <1 ns response - no added latency or phase shift in audio path. | Use Scenario: Adding IEC 61000-4-2 Level 4 ESD protection to 3.3 V microcontroller GPIOs in consumer IoT hubs. IC Role / Device Role / Timing Role: Low-capacitance (<2 pF) transient absorber placed directly at connector entry point. Use Value: Absorbs 15 kV contact discharge without triggering system reset, thanks to 85 W surge rating and 150°C Tj limit preventing thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5235B-7-F (Diodes Inc.) | Single-cathode, 6.8 V ±5%, ZZ = 10 Ω @ 20 mA, P = 300 mW | Lacks dual-cathode symmetry; requires two devices for bidirectional clamping | Preferred when higher power margin or lower ZZ is needed, but increases component count and board area |
| BZX84-C6V8 (Nexperia) | Single-cathode SOT-23, 6.8 V ±5%, ZZ = 40 Ω @ 5 mA, P = 350 mW | Higher dynamic impedance reduces reference accuracy; different package footprint (SOT-23 vs SC-59) | Suitable for cost-sensitive designs where ±0.5 V clamping tolerance is acceptable and layout allows SOT-23 placement |
Compared with MMBZ5235B-7-F and BZX84-C6V8, RD6.8MW-T1B-A uniquely delivers matched dual-cathode performance in SC-59, enabling single-device bidirectional protection with tighter ZZ control and proven industrial thermal reliability - critical for space-constrained, high-reliability analog interfaces.
Availability
RD6.8MW-T1B-A is available at Aetrix Electronics and suitable for USB data line protection, industrial sensor biasing, audio waveform clipping, and microcontroller GPIO ESD guard circuits requiring stable component supply and long-term obsolescence management.
Supply support for RD6.8MW-T1B-A 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
Renesas Electronics Corporation is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices, with global R&D and manufacturing infrastructure.
The RD2.0MW to RD39MW series was designed specifically for compact, dual-junction zener applications in consumer and industrial electronics - emphasizing SC-59 package compatibility, E24 voltage standardization, and repeatable surge performance.
FAQ
What is the exact zener voltage tolerance for RD6.8MW-T1B-A?
The RD6.8MW-T1B-A has a guaranteed zener voltage range of 6.47 V to 7.14 V at 5 mA test current, corresponding to ±5% tolerance per E24 standard. This specification is measured under pulse conditions (40 ms) and applies to both K1–A and K2–A junctions independently, ensuring matched performance across its dual-cathode structure.
Can RD6.8MW-T1B-A be used for bidirectional ESD protection on a single signal line?
Yes - RD6.8MW-T1B-A is explicitly designed for this purpose. With Pin 3 as common anode and Pins 1 and 2 as independent cathodes, it provides symmetrical ±6.8 V clamping: K1→A limits negative transients, K2→A limits positive transients. Its 85 W surge rating (10 µs) supports IEC 61000-4-2 Level 4 compliance when placed directly at the connector.
What is the thermal derating behavior of RD6.8MW-T1B-A above 25°C ambient?
RD6.8MW-T1B-A follows linear derating from 200 mW at 25°C, reaching 0 mW at 150°C junction temperature. The transient thermal impedance curve (Fig. 5 in D10247EJ5V0DS00) shows Zth = 625 °C/W at t = 1 s, meaning a 200 mW steady-state load raises Tj by 125°C above TA. Layout must ensure adequate copper area to maintain Tj ≤ 150°C under worst-case ambient.
Does RD6.8MW-T1B-A meet RoHS requirements?
Yes - RD6.8MW-T1B-A complies with EU RoHS Directive 2011/65/EU. Renesas Electronics confirms lead-free terminations and absence of restricted substances (Pb, Cd, Hg, Cr⁶⁺, PBB, PBDE) per their environmental compliance documentation. Full material declarations are available upon request through Renesas sales offices.
How does the forward voltage of RD6.8MW-T1B-A affect its use in active-bias circuits?
The RD6.8MW-T1B-A exhibits VF ≤ 0.35 V at 5 mA forward current, enabling efficient use in active-bias configurations such as op-amp reference dividers or LED current-setting networks. This low VF minimizes power loss and thermal drift, preserving accuracy in precision analog stages where the RD6.8MW-T1B-A serves as a stable 6.8 V anchor point.
RD6.8MW-T1B-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59
RD6.8MW-T1B-A FAQ
1.How can I place an order for RD6.8MW-T1B-A through Aetrix?
Please submit a Request for Quotation (RFQ) for RD6.8MW-T1B-A 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 RD6.8MW-T1B-A reliable?
The price and inventory of RD6.8MW-T1B-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD6.8MW-T1B-A is usually 5 days.
3.What payment methods are accepted for RD6.8MW-T1B-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD6.8MW-T1B-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD6.8MW-T1B-A?
RD6.8MW-T1B-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD6.8MW-T1B-A 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 RD6.8MW-T1B-A?
For technical support, including RD6.8MW-T1B-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD6.8MW-T1B-A requirements.
6.How does Aetrix verify that RD6.8MW-T1B-A is sourced from the original manufacturer or authorized distributors?
All RD6.8MW-T1B-A 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 RD6.8MW-T1B-A meets industry standards.
7.What is the process for return or replacement of RD6.8MW-T1B-A?
All RD6.8MW-T1B-A units undergo pre-shipment inspection (PSI). If there is an issue with RD6.8MW-T1B-A, 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 RD6.8MW-T1B-A part is unused and in its original packaging.
Return procedure for RD6.8MW-T1B-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD6.8MW-T1B-A Tags
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MM5Z5V1ST1G
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