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Vishay General Semiconductor - Diodes Division BZM55C68-TR
- Part No.:
- BZM55C68-TR
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- 2-SMD, No Lead
- Datasheet:
-
BZM55C68-TR.pdf
- Description:
- DIODE ZENER 68V 500MW MICROMELF
- Quantity:
- Payment:
- Shipping:
Inventory:9,224
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Product details
Overview
BZM55C68-TR from Vishay Semiconductors is a precision small-signal Zener diode in MicroMELF (SOD-80) package, designed for voltage stabilization and reference applications. It delivers a nominal Zener voltage of 68 V at 2.5 mA test current, with ±5.9% tolerance (64–72 V), dynamic resistance of 51 Ω, and temperature coefficient of +0.04 %/K at 25 °C - enabling stable regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the BZM55C68-TR datasheet, BZM55C68-TR pinout, BZM55C68-TR application, or BZM55C68-TR equivalent, key selection criteria include its 68 V Zener voltage accuracy, low reverse leakage (< 0.1 μA at VR), hermetic MicroMELF construction, 500 mW power rating, and suitability for high-stability analog references and industrial voltage clamping.
Technical Context
The BZM55C68-TR operates as a single-element, silicon planar Zener diode with sharp reverse breakdown characteristics and low noise. Its Zener voltage is specified at IZT = 2.5 mA with a maximum dynamic resistance of 51 Ω at 1 kHz, ensuring minimal regulation error under load variation.
It features a positive temperature coefficient (+0.04 %/K at 25 °C, +0.12 %/K at 125 °C), indicating predictable voltage drift with junction temperature rise - critical for thermal design in unregulated DC supplies and sensor biasing networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 64–72 V (nominal 68 V at 2.5 mA); defines precise clamping/reference level in feedback or protection circuits |
| Power Dissipation (Ptot) | 500 mW; supports continuous operation up to 7.4 mA at 68 V without derating at 25 °C ambient |
| Dynamic Resistance (ZZ) | ≤ 51 Ω at 2.5 mA; ensures tight regulation with < 0.35 V deviation per 18 mA load change |
| Reverse Leakage (IR) | < 0.1 μA at rated VR; minimizes standby current in battery-powered voltage monitors |
| Temperature Coefficient (TKVZ) | +0.04 %/K at 25 °C; enables predictable +27 mV/°C drift for thermal compensation design |
| Junction Temperature (Tj) | −65 to +175 °C; supports operation in extended industrial and automotive under-hood environments |
| Package | MicroMELF (SOD-80); hermetically sealed glass body with 1.8 mm diameter, enabling high reliability in humid or corrosive conditions |
Pinout & Package
As a two-terminal axial diode in MicroMELF (SOD-80) package, the BZM55C68-TR has no discrete pins but features a cylindrical glass body with cathode identified by a dark band. The anode and cathode terminals are accessed via metallized end caps; polarity must be observed during PCB placement to ensure correct reverse-bias operation.
| Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground node | Connected to lower-potential side in shunt regulator; forms return path for Zener current |
| Cathode | Zener breakdown terminal / voltage reference output node | Connected to regulated rail; provides stable 68 V reference when reverse biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Prevents moisture ingress and long-term parameter drift - critical for >10-year field reliability in telecom infrastructure |
| Very sharp reverse characteristic | Enables clean clamping at 68 V with < 0.5 V knee spread; reduces overshoot in transient suppression |
| Low reverse leakage current | < 0.1 μA at VR ensures negligible quiescent current in always-on reference circuits |
| High stability over temperature | +0.04 %/K TC allows accurate prediction of VZ shift across −40 to +125 °C operating range |
| Fits SOD-323 footprint compatibility | Same mounting geometry as SOD-323 devices enables layout reuse in space-constrained designs |
Applications
| Industrial Power Supply Feedback | Automotive Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using TL431-like topology with external Zener reference. IC Role / Device Role / Timing Role: Provides precise 68 V reference for optocoupler feedback loop, replacing higher-cost programmable shunt regulators. Use Value: Enables ±1% output regulation accuracy with minimal component count and no trimming required. |
Use Scenario: Protecting CAN transceiver inputs against load-dump transients exceeding 60 V in 24 V vehicle systems. IC Role / Device Role / Timing Role: Acts as passive shunt clamp, diverting surge current away from sensitive interface ICs during ISO 16750-2 pulses. Use Value: Absorbs up to 500 mW peak energy without degradation, maintaining clamping voltage below 75 V for 100 ms. |
| Test Equipment Voltage Reference | LED Driver Open-Circuit Protection |
Use Scenario: Generating stable calibration reference in portable multimeters and benchtop DMMs requiring traceable 68 V source. IC Role / Device Role / Timing Role: Functions as primary Zener reference in precision voltage divider networks with low TC drift compensation. Use Value: Delivers < 50 ppm/°C total drift over 0–50 °C, meeting Class II metrology requirements. |
Use Scenario: Preventing damage to constant-current LED drivers when output strings open unexpectedly. IC Role / Device Role / Timing Role: Clamps driver output to 68 V, limiting MOSFET drain-source voltage during fault conditions. Use Value: Ensures driver IC remains within safe SOA limits without adding active sensing circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZM55B68-TR | Narrower VZ tolerance: 66.6–69.4 V (±2%) vs. 64–72 V (±5.9%); same 51 Ω ZZ, +0.04 %/K TC | Better suited for precision reference where tighter voltage binning is required; identical thermal and packaging specs | Select BZM55B68-TR when ±2% VZ accuracy is mandatory; otherwise BZM55C68-TR offers cost advantage for general stabilization |
| 1N4744A-TAP | Different package (DO-41, axial lead); VZ = 14 V nominal, not 68 V; not a direct voltage match | Not functionally equivalent - used in lower-voltage (14 V) applications; incompatible pinout and thermal profile | Only consider for redesigns targeting 14 V; BZM55C68-TR remains optimal for 68 V MicroMELF requirements |
Compared with BZM55B68-TR, the BZM55C68-TR trades tighter voltage tolerance for broader availability and lower unit cost while retaining identical thermal performance, reliability, and MicroMELF form factor; neither part is pin-compatible with DO-41 alternatives like 1N4744A-TAP due to fundamental package and voltage differences.
Availability
BZM55C68-TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive overvoltage protection, precision test equipment, and LED driver fault management requiring stable component supply and long-lifecycle support.
Supply support for BZM55C68-TR 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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics with emphasis on ruggedized packaging and automotive-grade qualification.
The BZM55-Series targets high-stability voltage reference and clamping applications in harsh environments, leveraging hermetic MicroMELF construction to meet extended temperature and humidity requirements.
FAQ
What is the Zener voltage tolerance of the BZM55C68-TR?
The BZM55C68-TR has a Zener voltage range of 64 V to 72 V at 2.5 mA test current, corresponding to a nominal 68 V with ±5.9% tolerance. This is confirmed in the Electrical Characteristics table on page 2 of Vishay document 85597, revision 2.3. The wider tolerance reflects its "C" grade classification optimized for cost-sensitive stabilization rather than metrology-grade referencing.
Can the BZM55C68-TR be used in surface-mount reflow processes?
Yes, the BZM55C68-TR is qualified for standard reflow soldering per J-STD-020 MSL Level 1, with peak temperature up to 260 °C. Its MicroMELF (SOD-80) package uses UL 94 V-0 compliant molding compound and is explicitly rated for both reflow and wave soldering in Vishay's package documentation (page 6, fig. 9–10).
What is the maximum reverse leakage current for the BZM55C68-TR?
The BZM55C68-TR specifies a maximum reverse leakage current (IR) of < 0.1 μA at rated reverse voltage (VR), measured at Tj = 25 °C. This ultra-low leakage is verified in the Electrical Characteristics table (page 2) and supports low-power standby modes in battery-backed systems.
How does the temperature coefficient of the BZM55C68-TR affect its regulation accuracy?
The BZM55C68-TR exhibits a temperature coefficient of +0.04 %/K at 25 °C and +0.12 %/K at 125 °C. This means its Zener voltage increases by approximately 27 mV per °C rise at room temperature - a predictable, linear drift that can be compensated in circuit design or accepted where ±1% total variation is acceptable across −40 to +125 °C.
Is the BZM55C68-TR hermetically sealed?
Yes, the BZM55C68-TR uses a hermetically sealed glass MicroMELF (SOD-80) package, as stated in the FEATURES section (page 1) of Vishay document 85597. This construction prevents moisture penetration and ensures long-term parametric stability in humid or chemically aggressive environments.
BZM55C68-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- BZM55
- Package/Case:
- 2-SMD, No Lead
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 68 V
- Tolerance:
- -
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1000 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 51 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- MicroMELF
BZM55C68-TR FAQ
1.How can I place an order for BZM55C68-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZM55C68-TR 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 BZM55C68-TR reliable?
The price and inventory of BZM55C68-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZM55C68-TR is usually 5 days.
3.What payment methods are accepted for BZM55C68-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZM55C68-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZM55C68-TR?
BZM55C68-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZM55C68-TR 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 BZM55C68-TR?
For technical support, including BZM55C68-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZM55C68-TR requirements.
6.How does Aetrix verify that BZM55C68-TR is sourced from the original manufacturer or authorized distributors?
All BZM55C68-TR 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 BZM55C68-TR meets industry standards.
7.What is the process for return or replacement of BZM55C68-TR?
All BZM55C68-TR units undergo pre-shipment inspection (PSI). If there is an issue with BZM55C68-TR, 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 BZM55C68-TR part is unused and in its original packaging.
Return procedure for BZM55C68-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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