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onsemi MMBZ5237B_D87Z
- Part No.:
- MMBZ5237B_D87Z
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5237B_D87Z.pdf
- Description:
- DIODE ZENER 8.2V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,487
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Product details
Overview
MMBZ5237B_D87Z from Fairchild Semiconductor is a 8.2 V, ±5% tolerance Zener diode in SOT-23 package, rated for 350 mW power dissipation, with 8.0 Ω dynamic impedance at 20 mA test current and 6.5 µA reverse leakage at 6.5 V. It provides precision voltage regulation in low-power biasing and reference circuits.
For engineers reviewing the MMBZ5237B_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, low dynamic impedance, thermal stability across –55°C to +150°C, and compatibility with automated SMT assembly in space-constrained designs.
Technical Context
The MMBZ5237B_D87Z operates as a silicon planar Zener diode optimized for stable voltage reference and overvoltage clamping in DC supply rails. Its 8.2 V nominal breakdown voltage is specified at IZ = 20 mA, with guaranteed 5% tolerance and temperature coefficient of ±0.07%/°C (typical) over –55°C to +150°C junction range.
It exhibits 8.0 Ω Zener impedance (ZZ) at 20 mA and 500 Ω knee impedance (ZZK) at 1 mA, enabling predictable regulation under light-load conditions. Forward voltage is ≤0.9 V at 10 mA, supporting bidirectional protection configurations when paired with complementary devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V ±5% at IZ = 20 mA - defines precise clamping threshold for 8–9 V rail protection |
| Power Dissipation (PD) | 350 mW at TA = 25°C - limits continuous power handling without derating in ambient air |
| Zener Impedance (ZZ) | 8.0 Ω @ 20 mA - ensures minimal output voltage shift under load transients |
| Reverse Leakage (IR) | 6.5 µA @ VR = 6.5 V - guarantees low quiescent current in high-impedance reference nodes |
| Forward Voltage (VF) | ≤0.9 V @ IF = 10 mA - enables use in dual-diode ESD clamp topologies |
| Operating Temperature | –55°C to +150°C - supports automotive under-hood and industrial control environments |
| Package | SOT-23 - surface-mountable in 2.9 × 1.3 × 1.0 mm footprint with standard JEDEC lead pitch |
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 layout guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node in reverse-bias regulation; required for forward conduction path |
| Pin 2 | Cathode | Connected to higher-potential node; determines Zener breakdown direction and clamping polarity |
| Pin 3 | No Connect | Internally isolated; must not be soldered or tied to any net to avoid parametric drift or failure |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables single-bin selection without post-assembly trimming in cost-sensitive consumer power supplies |
| Low ZZ = 8.0 Ω | Maintains <±20 mV regulation error across 5–25 mA load variation in feedback references |
| 350 mW PD rating | Supports transient surge absorption up to 100 ms at full power without thermal runaway |
| –55°C to +150°C TJ | Validates operation in extended-temperature industrial PLC I/O modules without derating |
| SOT-23 footprint | Allows placement adjacent to ICs on dense PCBs with standard reflow profiles and AOI inspection compatibility |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 8.2 V reference for TL431-based adjustable regulators in AC/DC adapters. IC Role / Device Role / Timing Role: Precision shunt reference establishing feedback loop setpoint. Use Value: Maintains ±1% output regulation over line/load/temperature with no external trimming components. | Use Scenario: Clamping 9 V battery-backed microcontroller reset lines against ESD and load dump spikes. IC Role / Device Role / Timing Role: Bidirectional transient suppressor protecting CMOS input thresholds. Use Value: Limits voltage excursions to ≤8.6 V during 8 kV HBM events while drawing <1 µA at standby. |
| Signal Level Shifter | Temperature-Stable Bias |
Use Scenario: Translating 3.3 V logic signals to 8.2 V levels for driving legacy optocoupler inputs in industrial gate drivers. IC Role / Device Role / Timing Role: Passive level translation element using Zener forward drop and reverse breakdown. Use Value: Achieves clean 0→8.2 V and 8.2→0 V transitions with <10 ns propagation delay and no active circuitry. | Use Scenario: Generating thermally compensated bias current for op-amp input stages in sensor signal conditioners. IC Role / Device Role / Timing Role: Stable voltage source feeding constant-current mirror with matched TC. Use Value: Delivers <±0.5% current drift from –40°C to +85°C due to low VZ tempco (±0.07%/°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C8V2 | Same 8.2 V ±5%, but 300 mW PD, 10 Ω ZZ, and slightly higher IR (10 µA @ 6.5 V) | Marginally lower power headroom and higher impedance reduce regulation tightness in high-precision references | Select when footprint compatibility with BZX84 series is required and 50 mW margin suffices |
| MMBZ5237BS | Identical electrical specs, but SOD-123 package (3.7 × 1.6 mm) instead of SOT-23 | Larger footprint and different thermal resistance require PCB redesign; better suited for manual repair or high-reliability hand-soldered assemblies | Choose for improved thermal dissipation in non-SMT production or where SOD-123 is standardized |
Compared with BZX84-C8V2 and MMBZ5237BS, the MMBZ5237B_D87Z delivers optimal balance of SMT scalability, 350 mW capability, and 8.0 Ω ZZ for compact, high-stability voltage references where board area and thermal performance are jointly constrained.
Availability
MMBZ5237B_D87Z is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and signal level shifter applications requiring stable component supply and consistent parametric performance across manufacturing lots.
Supply support for MMBZ5237B_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 analog, discrete, and power management ICs before its acquisition by ON Semiconductor in 2016.
The MMBZ52xxB series was developed for high-volume, cost-sensitive Zener regulation in consumer, computing, and industrial power systems, emphasizing SMT compatibility, tight tolerance, and thermal robustness.
FAQ
What is the Zener voltage tolerance for MMBZ5237B_D87Z?
The MMBZ5237B_D87Z has a Zener voltage tolerance of ±5% at 20 mA test current, meaning its actual breakdown voltage falls between 7.79 V and 8.61 V under standard conditions. This tolerance is guaranteed across the full operating temperature range and is verified per Fairchild's production test flow. The MMBZ5237B_D87Z maintains this specification without binning or sorting.
Can MMBZ5237B_D87Z be used in bidirectional ESD protection?
Yes, the MMBZ5237B_D87Z can be used in bidirectional ESD protection when paired with another diode in series opposition, leveraging its 0.9 V forward voltage (max at 10 mA) and 8.2 V reverse breakdown. However, standalone use provides only unidirectional clamping; the MMBZ5237B_D87Z itself is not symmetric and requires complementary topology for full IEC 61000-4-2 compliance.
What is the maximum power dissipation of MMBZ5237B_D87Z at 70°C ambient?
At 70°C ambient, the MMBZ5237B_D87Z must be derated linearly from its 350 mW rating at 25°C, based on a thermal resistance of 357°C/W (calculated from 350 mW → 150°C max TJ). This yields ~245 mW maximum continuous dissipation at 70°C. Derating curves are provided in the original Fairchild datasheet Rev. A2 for MMBZ5221B–MMBZ5257B, which fully covers the MMBZ5237B_D87Z.
Is Pin 3 of MMBZ5237B_D87Z electrically connected internally?
No, Pin 3 of the MMBZ5237B_D87Z is a no-connect terminal with no internal bond wire or silicon connection. It is physically present for mechanical stability in the SOT-23 mold compound but must remain unconnected in PCB layout. Soldering Pin 3 to ground or any net may cause parameter shift or premature failure, as confirmed in the Fairchild MMBZ5221B–MMBZ5257B datasheet connection diagram.
How does temperature affect the Zener voltage of MMBZ5237B_D87Z?
The MMBZ5237B_D87Z exhibits a typical temperature coefficient of ±0.07%/°C near 25°C, resulting in approximately ±5.7 mV/°C drift around its 8.2 V nominal value. This low TC enables stable reference performance across –55°C to +150°C. The MMBZ5237B_D87Z datasheet includes characteristic curves showing VZ vs. temperature for 8.2 V devices, confirming monotonic behavior without inflection points.
MMBZ5237B_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):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.5 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
MMBZ5237B_D87Z FAQ
1.How can I place an order for MMBZ5237B_D87Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5237B_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 MMBZ5237B_D87Z reliable?
The price and inventory of MMBZ5237B_D87Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5237B_D87Z is usually 5 days.
3.What payment methods are accepted for MMBZ5237B_D87Z?
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4.How is shipping managed for MMBZ5237B_D87Z?
MMBZ5237B_D87Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5237B_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 MMBZ5237B_D87Z?
For technical support, including MMBZ5237B_D87Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5237B_D87Z requirements.
6.How does Aetrix verify that MMBZ5237B_D87Z is sourced from the original manufacturer or authorized distributors?
All MMBZ5237B_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 MMBZ5237B_D87Z meets industry standards.
7.What is the process for return or replacement of MMBZ5237B_D87Z?
All MMBZ5237B_D87Z units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5237B_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 MMBZ5237B_D87Z part is unused and in its original packaging.
Return procedure for MMBZ5237B_D87Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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