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Renesas HZM18NB2JTL
- Part No.:
- HZM18NB2JTL
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZM18NB2JTL.pdf
- Description:
- DIODE ZENER
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Inventory:15,000
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Product details
Overview
HZM18NB2JTL from Renesas Electronics is a silicon epitaxial planar Zener diode designed for precision voltage stabilization in low-power analog and reference circuits. It delivers a nominal zener voltage of 18.21 V to 19.03 V at 5 mA test current, with dynamic resistance of 45 Ω, power dissipation rating of 200 mW, and operates within –55°C to +150°C storage temperature range - commonly used in voltage reference supplies for industrial sensors and power management IC biasing.
For engineers reviewing the HZM18NB2JTL datasheet, HZM18NB2JTL pinout, HZM18NB2JTL application, or HZM18NB2JTL equivalent, key selection criteria include verified zener voltage tolerance (±0.82 V), low dynamic impedance at 5 mA, MPAK surface-mount package compatibility with high-density PCB layouts, thermal stability across ambient temperatures, and compliance with Renesas' Standard quality grade for industrial equipment.
Technical Context
The HZM18NB2JTL employs a silicon epitaxial planar junction structure optimized for stable reverse-breakdown behavior under DC and pulsed conditions (Pw = 40 ms). Its zener voltage exhibits a positive temperature coefficient of approximately +0.07 mV/°C near 18 V, enabling predictable drift compensation in reference designs.
It functions exclusively in reverse-bias mode with defined anode–cathode polarity, requires no external bias circuitry, and relies on controlled test current (IZ = 5 mA) to maintain specified VZ and rd. The NC (no-connect) terminal isolates internal structure and must remain unconnected in layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18.21 V to 19.03 V at IZ = 5 mA - defines stable regulation point for reference supply rails |
| Dynamic Resistance (rd) | 45 Ω max at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Power Dissipation (Pd) | 200 mW at Ta = 25°C - sets maximum continuous power handling before thermal derating |
| Reverse Current (IR) | 2 μA max at VR = 13.0 V - specifies leakage below breakdown, critical for low-current bias networks |
| Junction Temperature (Tj) | 150°C max - constrains thermal design margin when mounted on FR-4 PCB with 1.6 mm thickness |
| Package | MPAK (PLSP0003ZC-A) - 3-pin SMT package with 0.65 mm lead pitch, footprint compatible with SC-59A |
Pinout & Package
Package: MPAK (JEITA code PLSP0003ZC-A), 3-terminal surface-mount plastic package with exposed pad thermal path; dimensions: D = 2.7–3.1 mm, E = 1.35–1.65 mm, L = 0.65 mm, mass = 0.011 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect (NC) | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or reliability risk |
| 2 | Anode | Connected to lower-potential node; reverse-bias current enters here during regulation |
| 3 | Cathode | Connected to higher-potential node; zener voltage develops between cathode and anode |
Key Features
| Feature | Design Value |
|---|---|
| Zener voltage grade B2 tolerance | ±0.41 V total span (18.21–19.03 V) enables tighter reference selection vs. grade B |
| Low dynamic resistance | 45 Ω max ensures <1 mV output shift per 22 μA load change - suitable for precision analog feedback |
| MPAK surface-mount package | 0.65 mm pin pitch and 1.0 mm height support automated placement and high board density |
| Thermal stability | Specified operation up to Tj = 150°C allows use in thermally constrained enclosures without derating |
| Standard quality grade | Qualified for industrial applications including test equipment, sensor signal conditioning, and power supply monitoring |
Applications
| Industrial Sensor Reference | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Provides stable 18 V reference for bridge sensor excitation in pressure transducers operating at 85°C ambient. IC Role / Device Role / Timing Role: Zener diode acting as two-terminal shunt voltage reference, replacing bulkier TL431-based solutions. Use Value: Enables direct excitation from 24 V rail with <±0.5% regulation error over temperature, reducing component count and board space. |
Use Scenario: Generates clean reset threshold for 3.3 V microcontrollers in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Functions as precision voltage monitor via resistor divider into supervisor IC input. Use Value: Delivers consistent 18 V reference for accurate 1.2 V reset threshold scaling, minimizing false resets during brown-out events. |
| DC-DC Feedback Divider | Overvoltage Clamp Protection |
Use Scenario: Sets regulated output voltage in isolated flyback converter feedback loop using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Shunt reference element defining upper bound of feedback network voltage range. Use Value: Maintains ±1.5% output accuracy across line/load/temperature with minimal drift versus ceramic-capacitor-loaded references. |
Use Scenario: Clamps transient surges on 24 V industrial bus lines to protect downstream CAN transceivers and IO modules. IC Role / Device Role / Timing Role: Fast-acting voltage clamp activated above 19.03 V, diverting surge energy to ground. Use Value: Limits peak bus voltage to <20 V during 100 ns transients, preventing latch-up in 24 V-rated interface ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage stabilization applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | Zener voltage 17.5–18.5 V (±0.5 V), 350 mW Pd, SOT-23 package, rd = 40 Ω | Higher power rating but larger footprint; less tight VZ tolerance than HZM18NB2JTL grade B2 | Preferred where board space permits and higher surge power handling is needed |
| MMSZ5245B-TP | Zener voltage 17.1–18.9 V (±0.9 V), 500 mW Pd, SOD-123 package, rd = 35 Ω | Wider VZ spread and higher Pd; not graded - lacks B2 precision binning | Selected for cost-sensitive applications where ±0.9 V tolerance is acceptable |
Compared with BZX84-C18LT1G and MMSZ5245B-TP, the HZM18NB2JTL offers tighter zener voltage control (±0.41 V), MPAK's compact 3-pin layout with NC isolation, and Renesas' documented thermal performance up to 150°C - making it optimal for space-constrained industrial reference designs requiring repeatable regulation.
Availability
HZM18NB2JTL is available at Aetrix Electronics and suitable for industrial sensor reference supplies, microcontroller reset circuits, DC-DC feedback dividers, and overvoltage clamp protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for HZM18NB2JTL 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 is a global semiconductor manufacturer headquartered in Japan, delivering microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
The HZM-N Series belongs to Renesas' discrete Zener diode product line, engineered specifically for high-stability voltage reference and clamping in industrial-grade equipment operating across extended temperature ranges.
FAQ
What is the exact zener voltage range for HZM18NB2JTL at 5 mA?
The HZM18NB2JTL has a guaranteed zener voltage range of 18.21 V to 19.03 V when tested at IZ = 5 mA and Ta = 25°C. This B2-grade specification reflects a tighter tolerance than standard grade B devices and is confirmed in Renesas' R07DS0358EJ0600 datasheet, page 3. The HZM18NB2JTL achieves this precision through post-process binning and is intended for applications requiring stable reference points without active regulation.
Does HZM18NB2JTL require a series current-limiting resistor in all applications?
Yes, the HZM18NB2JTL must always be used with an external series current-limiting resistor to control reverse current and prevent thermal runaway. Its 200 mW power rating assumes proper biasing - for example, at 24 V supply and 5 mA target current, a 1.2 kΩ resistor limits power dissipation to 115 mW. The HZM18NB2JTL datasheet (page 2) specifies absolute maximum ratings based on this condition, and omitting the resistor risks exceeding Pd or Tj limits.
What does the "B2" suffix in HZM18NB2JTL signify?
The "B2" suffix in HZM18NB2JTL denotes the zener voltage grade bin: B2 indicates a tighter VZ tolerance window (18.21–19.03 V) compared to B1 (18.86–19.70 V) and B3 (18.21–19.03 V, same as B2 for HZM18N per datasheet page 3). This binning enables predictable performance in production without post-assembly calibration. The HZM18NB2JTL marking code "183" (per page 4) further confirms its B2 classification and distinguishes it from other HZM18N variants.
Can HZM18NB2JTL be used in place of a TL431 shunt regulator?
No, the HZM18NB2JTL cannot directly replace a TL431 because it lacks an internal reference, amplifier, and adjustable feedback capability. The HZM18NB2JTL is a passive two-terminal device with fixed breakdown voltage, while the TL431 is an active three-terminal programmable shunt regulator. However, the HZM18NB2JTL serves as a simpler, lower-cost alternative where only basic 18 V clamping or coarse reference is required - such as in non-critical bias networks where the HZM18NB2JTL's 45 Ω dynamic resistance and ±0.41 V tolerance meet system needs.
Is the NC pin on HZM18NB2JTL electrically connected internally?
No, Pin 1 (NC) on the HZM18NB2JTL is not electrically connected to any internal semiconductor structure - it is a mechanical dummy terminal included for package symmetry and mounting stability. Renesas explicitly states in the pin arrangement diagram (page 1) and package notes that Pin 1 is "NC", and the datasheet warns against connecting it to avoid parasitic coupling or unintended current paths. Leaving the NC pin unconnected is mandatory for reliable operation of the HZM18NB2JTL.
HZM18NB2JTL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
HZM18NB2JTL FAQ
1.How can I place an order for HZM18NB2JTL through Aetrix?
Please submit a Request for Quotation (RFQ) for HZM18NB2JTL 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 HZM18NB2JTL reliable?
The price and inventory of HZM18NB2JTL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZM18NB2JTL is usually 5 days.
3.What payment methods are accepted for HZM18NB2JTL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZM18NB2JTL transactions.
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4.How is shipping managed for HZM18NB2JTL?
HZM18NB2JTL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZM18NB2JTL 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 HZM18NB2JTL?
For technical support, including HZM18NB2JTL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZM18NB2JTL requirements.
6.How does Aetrix verify that HZM18NB2JTL is sourced from the original manufacturer or authorized distributors?
All HZM18NB2JTL 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 HZM18NB2JTL meets industry standards.
7.What is the process for return or replacement of HZM18NB2JTL?
All HZM18NB2JTL units undergo pre-shipment inspection (PSI). If there is an issue with HZM18NB2JTL, 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 HZM18NB2JTL part is unused and in its original packaging.
Return procedure for HZM18NB2JTL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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