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onsemi MMBZ5231B_D87Z
- Part No.:
- MMBZ5231B_D87Z
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5231B_D87Z.pdf
- Description:
- DIODE ZENER 5.1V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,821
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Product details
Overview
MMBZ5231B_D87Z from Fairchild Semiconductor is a 5.1 V, ±5% tolerance Zener diode in SOT-23 package, rated for 350 mW power dissipation, with 17 Ω dynamic impedance at 20 mA test current and 0.25 µA reverse leakage at 3.8 V. It provides precision voltage regulation in low-power biasing and reference circuits.
For engineers reviewing the MMBZ5231B_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, impedance stability across temperature, forward voltage limit (≤0.9 V @ 10 mA), and SOT-23 footprint compatibility in space-constrained designs.
Technical Context
The MMBZ5231B_D87Z operates as a silicon planar Zener diode optimized for stable voltage reference and overvoltage protection in DC bias networks. Its 5.1 V nominal breakdown voltage is specified at 20 mA test current, with tight 5% tolerance and low dynamic impedance enabling accurate clamping under varying load conditions.
Thermal performance is defined by a maximum junction temperature of +150°C and storage range from –55°C to +150°C. The device exhibits predictable Zener voltage drift versus temperature, with typical curves provided for 5.1 V variants across –25°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V ±5% at IZ = 20 mA - sets precise DC reference level for analog circuits |
| Zener Impedance (ZZ) | 17 Ω max at IZ = 20 mA - ensures minimal output voltage variation under load changes |
| Reverse Leakage (IR) | 0.25 µA max at VR = 3.8 V - guarantees low standby current in battery-powered systems |
| Power Dissipation (PD) | 350 mW at TA = 25°C - defines thermal derating envelope for PCB layout |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - enables use as low-drop rectifier or clamp in dual-direction protection |
| Package | SOT-23 - surface-mount, 3-pin footprint compatible with automated assembly and high-density routing |
Pinout & Package
SOT-23 package with three terminals: anode (Pin 1), cathode (Pin 2), and no-connect (Pin 3). Pin 3 is internally unconnected and must remain floating per datasheet connection diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connects to lower-potential node; forward conduction path when biased positively relative to cathode |
| Pin 2 | Cathode | Connects to higher-potential node; Zener breakdown occurs when reverse-biased above VZ |
| Pin 3 | No Connect (NC) | Internally isolated; must not be soldered or tied to any net to avoid parametric shift or failure |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage | 5.1 V ±5% with <±0.05%/°C tempco - maintains accuracy across industrial temperature range |
| Low dynamic impedance | 17 Ω at 20 mA - minimizes regulation error in feedback loops and reference dividers |
| Guaranteed forward voltage | ≤0.9 V @ 10 mA - supports bidirectional clamping without external series diodes |
| Robust thermal rating | +150°C max junction temperature - suitable for enclosed or high-ambient environments |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 5.1 V reference for op-amp biasing and ADC voltage references in low-power sensor nodes. IC Role / Device Role / Timing Role: Precision shunt voltage reference regulating supply rail for analog front-end circuitry. Use Value: Enables 12-bit ADC accuracy by limiting reference drift to <±10 mV over –40°C to +85°C ambient. | Use Scenario: Protecting microcontroller GPIO pins from transient surges on 5 V I/O lines. IC Role / Device Role / Timing Role: Bidirectional ESD and overvoltage clamp using forward and reverse conduction paths. Use Value: Limits pin voltage to ≤5.1 V during positive transients and ≤0.9 V during negative excursions, meeting IEC 61000-4-2 Level 3. |
| Current Source Bias | Linear Regulator Feedback |
Use Scenario: Setting constant current for LED biasing in indicator circuits with variable input voltage. IC Role / Device Role / Timing Role: Zener-based two-resistor current source delivering stable 1–2 mA drive. Use Value: Maintains LED brightness within ±5% across 4.5–5.5 V supply variation due to low ZZ and tight VZ tolerance. | Use Scenario: Generating feedback voltage for adjustable LDO regulators targeting 5.1 V output. IC Role / Device Role / Timing Role: Shunt reference in resistor-divider network setting output voltage setpoint. Use Value: Reduces output voltage error to <±1.5% by eliminating divider ratio sensitivity to resistor tolerance and temperature drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C5V1 | Same 5.1 V ±5%, but 400 mW PD, 60 Ω ZZ @ 5 mA - higher impedance, lower test current | Less stable under dynamic loads; suited for static bias, not precision reference | Prefer MMBZ5231B_D87Z where low-Z regulation or 20 mA operation is required |
| MMBZ5231BS | Identical electrical specs, same SOT-23 package, but marked "S" suffix - RoHS-compliant variant with matte tin lead finish | No functional difference; used where lead-free compliance is mandated | Select MMBZ5231B_D87Z for legacy Pb-based assembly; MMBZ5231BS for new RoHS designs |
Compared with BZX84-C5V1 and MMBZ5231BS, the MMBZ5231B_D87Z offers superior impedance performance at standard test current and serves as the baseline industrial-grade variant before RoHS transition, making it optimal for cost-sensitive, non-RoHS production runs requiring tight regulation.
Availability
MMBZ5231B_D87Z is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and current source bias applications requiring stable component supply, consistent parametric binning, and long-term obsolescence management.
Supply support for MMBZ5231B_D87Z 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The MMBZ5231B_D87Z belongs to the MMBZ52xxB Zener diode family, designed for compact, high-reliability voltage regulation in portable, automotive, and industrial electronics where SOT-23 footprint and stable 5.1 V reference are critical.
FAQ
What is the Zener voltage tolerance for MMBZ5231B_D87Z?
The MMBZ5231B_D87Z has a Zener voltage tolerance of ±5% at 20 mA test current, meaning its actual breakdown voltage falls between 4.845 V and 5.355 V under standard conditions. This tolerance is guaranteed across the full operating temperature range and is verified per the Fairchild MMBZ5221B–MMBZ5257B datasheet Rev. A2. The MMBZ5231B_D87Z maintains this specification without derating up to +125°C junction temperature.
Does MMBZ5231B_D87Z support bidirectional clamping?
Yes, the MMBZ5231B_D87Z supports bidirectional clamping: in reverse bias, it regulates at 5.1 V; in forward bias, it conducts with ≤0.9 V drop at 10 mA. This dual-mode behavior enables single-device transient suppression on signal lines. The MMBZ5231B_D87Z achieves this without external components, leveraging its symmetric silicon structure and guaranteed forward voltage spec.
What is the maximum power dissipation of MMBZ5231B_D87Z?
The MMBZ5231B_D87Z has a maximum power dissipation of 350 mW at ambient temperature of 25°C, as defined in the Absolute Maximum Ratings table. Derating is required above 25°C - approximately 2.8 mW/°C - down to zero at +150°C junction temperature. This rating applies only when mounted on standard FR-4 PCB with recommended pad layout per Fairchild's SOT-23 thermal guidelines.
Is Pin 3 of MMBZ5231B_D87Z electrically connected?
No, Pin 3 of the MMBZ5231B_D87Z is a no-connect (NC) terminal, explicitly designated as such in the official connection diagram. It is internally unconnected and must remain floating in the PCB layout. Soldering or tying Pin 3 to ground, VCC, or any other net may cause parameter shifts or premature failure. The MMBZ5231B_D87Z functions correctly using only Pins 1 (anode) and 2 (cathode).
How does MMBZ5231B_D87Z compare to MMBZ5231BS?
The MMBZ5231B_D87Z and MMBZ5231BS share identical electrical specifications, package, and pinout; the only difference is lead finish - MMBZ5231B_D87Z uses standard SnPb plating, while MMBZ5231BS uses matte tin for RoHS compliance. The MMBZ5231B_D87Z is intended for legacy manufacturing processes where Pb-based solder is used, and its marking "D87Z" reflects that variant's traceability and binning.
MMBZ5231B_D87Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 2 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5231B_D87Z FAQ
1.How can I place an order for MMBZ5231B_D87Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5231B_D87Z 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 MMBZ5231B_D87Z reliable?
The price and inventory of MMBZ5231B_D87Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5231B_D87Z is usually 5 days.
3.What payment methods are accepted for MMBZ5231B_D87Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5231B_D87Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5231B_D87Z?
MMBZ5231B_D87Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5231B_D87Z 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 MMBZ5231B_D87Z?
For technical support, including MMBZ5231B_D87Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5231B_D87Z requirements.
6.How does Aetrix verify that MMBZ5231B_D87Z is sourced from the original manufacturer or authorized distributors?
All MMBZ5231B_D87Z 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 MMBZ5231B_D87Z meets industry standards.
7.What is the process for return or replacement of MMBZ5231B_D87Z?
All MMBZ5231B_D87Z units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5231B_D87Z, 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 MMBZ5231B_D87Z part is unused and in its original packaging.
Return procedure for MMBZ5231B_D87Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5231B_D87Z Tags
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