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HomeProductsInductors, Coils, ChokesFixed InductorsPTHF500-894VM
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PTHF500-894VM - API Delevan Inc.

Manufacturer Part Number
PTHF500-894VM
Manufacturer
API Delevan
Allelco Part Number
98D-PTHF500-894VM
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
33,337 pcs available, New & Original
Parts Description
FIXED IND 500UH 3.4A 131 MOHM TH
Package
Radial, Vertical (Open)
Data sheet
-
RoHs Status
 
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In stock: 33337
  • Unit Price: $23.922
  • Subtotal: $0.00

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1+ $23.922 $23.92
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

PTHF500-894VM Tech Specifications
API Delevan Inc. - PTHF500-894VM technical specifications, attributes, parameters and parts with similar specifications to API Delevan Inc. - PTHF500-894VM

Product Attribute Attribute Value
Manufacturer API Delevan
Type Toroidal
Tolerance ±10%
Supplier Device Package -
Size / Dimension 1.450' L x 0.825' W (36.83mm x 20.95mm)
Shielding Shielded
Series PTHF-VM
Ratings -
Q @ Freq -
Package / Case Radial, Vertical (Open)
Package Bulk
Product Attribute Attribute Value
Operating Temperature -
Mounting Type Through Hole
Material - Core Molybdenum Permalloy(MPP)
Inductance Frequency - Test 1 kHz
Inductance 500 µH
Height - Seated (Max) 1.475' (37.46mm)
Frequency - Self Resonant 700kHz
DC Resistance (DCR) 131mOhm Max
Current Rating (Amps) 3.4 A
Current - Saturation (Isat) 3.1A

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8504.50.4000

Frequently Asked Questions(FAQ)

What is the saturation current difference between the PTHF500-894VM and its rated current, and how does this affect circuit design?
The PTHF500-894VM has a rated continuous current of 3.4 A but saturates at 3.1 A, creating a 0.3 A margin. This 9% headroom between saturation and rated current is typical for molybdenum permalloy (MPP) core inductors and reflects the core's nonlinear permeability behavior near saturation. Designers must account for transient current spikes or dynamic load variations that could push the PTHF500-894VM into saturation, causing inductance to collapse and core heating. In switching power supplies or LED drivers, peak currents during startup or fault conditions can easily exceed this threshold. The saturation specification for the PTHF500-894VM should be treated as a hard design limit rather than a soft guideline; exceeding it generates harmonic distortion and accelerates core aging.
Why does the PTHF500-894VM specify 131 mOhm maximum DC resistance, and what thermal and efficiency trade-offs does this create?
The PTHF500-894VM's 131 mOhm DCR reflects the wire gauge and copper fill factor of its toroidal winding. At the rated 3.4 A, this produces I²R losses of approximately 1.5 W (3.4² × 0.131 = 1.51 W), which converts directly to heat. In continuous-mode operation, this dissipation stresses thermal management, particularly in compact enclosures or stacked power modules. The PTHF500-894VM's MPP core exhibits lower core losses than ferrite at higher frequencies, so the DCR becomes the dominant loss component below roughly 500 kHz. Applications requiring efficiency above 90% must either derate the PTHF500-894VM below 2.5 A or accept localized temperature rises of 40–60°C above ambient, depending on board layout and airflow. The 131 mOhm specification is fixed and cannot be improved through selection; upgrading to a larger core size or different series (such as higher-current variants) is the only way to reduce this loss.
How does the PTHF500-894VM's self-resonant frequency of 700 kHz constrain its high-frequency behavior?
The PTHF500-894VM exhibits its self-resonant frequency (SRF) at 700 kHz due to winding capacitance and core geometry. Above this frequency, the inductor's impedance transitions from inductive to capacitive, meaning the PTHF500-894VM effectively becomes a capacitor rather than an inductor. This transition occurs gradually; at 600 kHz the PTHF500-894VM still behaves inductively, but impedance drops sharply as frequency approaches and exceeds 700 kHz. For applications operating near or above this frequency (such as Class D amplifiers or high-frequency switching supplies), the PTHF500-894VM is unsuitable; designers must select a smaller inductance or toroidal inductor with lower winding parasitic capacitance. The 700 kHz SRF also creates a secondary resonance with source impedance; improper termination or layout can excite ringing at frequencies near the SRF, causing EMI or measurement artifacts when evaluating the PTHF500-894VM in the lab.
What are the practical differences between the PTHF500-894VM (MPP core, 500 µH) and a ferrite-core inductor of the same inductance for a 100 kHz boost converter?
At 100 kHz, the PTHF500-894VM (molybdenum permalloy core) exhibits lower core losses than an equivalent ferrite inductor, typically 30–50% less depending on ferrite grade. This advantage comes from MPP's lower permeability loss at mid-range frequencies. However, the PTHF500-894VM's higher saturation flux density (approximately 0.75 T for MPP vs. 0.3–0.4 T for typical ferrite) is offset by its larger size; the PTHF500-894VM measures 36.83 mm × 20.95 mm, while a ferrite equivalent might be 20–25% smaller. The trade-off is efficiency versus board space: the PTHF500-894VM runs cooler but occupies more real estate. For a 100 kHz boost converter stepping 12 V to 48 V, the PTHF500-894VM's superior thermal performance often justifies the larger footprint, especially if thermal margins are tight. A ferrite core would require active cooling or current derating to match the PTHF500-894VM's operational margin, making the PTHF500-894VM the better choice for applications prioritizing reliability over miniaturization.
How should PCB layout be modified when using the PTHF500-894VM in a noise-sensitive circuit?
The PTHF500-894VM is shielded, meaning its radial magnetic field is partially contained, but the shielding is not perfect; some fringing flux escapes, especially near the toroid's equator. In noise-sensitive circuits (e.g., precision analog front-ends or low-noise amplifiers), the PTHF500-894VM should be oriented with its axis perpendicular to sensitive signal traces. For maximum effectiveness, place the PTHF500-894VM at least 50 mm from low-level analog circuits, even though shielding reduces the effective range from the 80–100 mm typical of unshielded inductors. The PTHF500-894VM's lead orientation (radial, vertical mounting) means return current paths must be routed carefully; ground planes beneath the PTHF500-894VM are less effective than for axial inductors, so use local ground vias within 10 mm of both leads. If the PTHF500-894VM is used in a switching supply feeding a sensitive load, separate the ground return of the PTHF500-894VM from the load's ground plane at a single point to prevent noise coupling. Shielded toroidal inductors like the PTHF500-894VM can emit conducted noise on power rails; filtering the rail near the PTHF500-894VM with a ceramic capacitor (100 nF, X7R) reduces radiated and conducted EMI.
Does the ±10% inductance tolerance of the PTHF500-894VM require circuit compensation or binning in production?
The PTHF500-894VM's ±10% inductance tolerance means individual units can vary from 450 µH to 550 µH. For many applications (e.g., general-purpose power conversion, energy storage), this tolerance is absorbed by feedback loops or regulator compensation, so no special handling is required. However, in tuned LC circuits, RF impedance matching networks, or active filters where inductance directly sets resonant frequency or bandwidth, the PTHF500-894VM's tolerance becomes significant. A 10% variation shifts resonant frequency by approximately 5% (due to the √(LC) dependence), potentially causing filter cutoff frequencies to drift outside acceptable ranges. In such cases, designers can either: (1) select a tighter-tolerance inductor (±5% alternatives exist but may increase cost or lead time); (2) design the circuit with intentional margin (e.g., targeting 450 µH worst-case to ensure the PTHF500-894VM meets minimum inductance); or (3) implement post-production adjustment (e.g., parallel capacitor trimming). For small production runs, using the PTHF500-894VM as-is is often acceptable; for high-volume manufacturing where performance uniformity is critical, binning (sorting inductors by measured value) or switching to a matched pair specification ensures consistency.
What are the thermal and efficiency implications of operating the PTHF500-894VM continuously at its 3.4 A rating versus derating to 2.5 A?
Continuous operation of the PTHF500-894VM at its 3.4 A rating generates approximately 1.51 W of I²R losses (as calculated from the 131 mOhm DCR). In a typical power module with moderate thermal contact (e.g., solder-mounted to a 2 oz copper layer), this results in a junction-to-ambient temperature rise of 40–70°C depending on environmental cooling. Most applications tolerate this, but reliability testing shows that doubling the operating temperature halves the inductor's projected lifetime due to insulation degradation and core material aging. Derating the PTHF500-894VM to 2.5 A reduces I²R losses to 0.82 W, cutting the temperature rise to 25–40°C and extending projected life. For products with a 10-year operational target (e.g., industrial power supplies, renewable energy inverters), derating the PTHF500-894VM by 25–30% often becomes a design requirement. In space-constrained or high-altitude applications where natural convection is limited, the PTHF500-894VM should be derated further to 2.0 A or less unless active thermal management (fans, forced airflow) is implemented. The trade-off is reduced power handling; a 48 V supply using the PTHF500-894VM at 2.5 A delivers 120 W versus 163 W at full rating, a 26% penalty. For applications where size is negotiable, selecting a larger inductor with lower DCR (e.g., 80–100 mOhm) eliminates this trade-off entirely.
How does the PTHF500-894VM's ±10% inductance tolerance and 700 kHz self-resonant frequency affect its use in a 50 kHz PWM converter versus a 200 kHz converter?
At 50 kHz (well below the PTHF500-894VM's 700 kHz SRF), inductance tolerance and SRF have minimal impact; the PTHF500-894VM behaves as a stable, linear element. Frequency ripple is determined primarily by the ±10% tolerance, which translates to roughly ±5% variation in converter output ripple. At 200 kHz, the PTHF500-894VM is still safely below SRF, but the effects of winding parasitic capacitance become visible; the effective inductance decreases by approximately 2–5% due to capacitive interaction with the switching frequency. The ±10% tolerance band now encompasses both DCR losses and capacitive effects, making the PTHF500-894VM's actual inductance less predictable across the tolerance range. For a 50 kHz design, the PTHF500-894VM can be used with confidence in LC filtering or resonant circuits. For 200 kHz, verification through measurement or simulation (using a detailed model that includes series resistance and parallel capacitance) is recommended before production. Above 300 kHz, the PTHF500-894VM approaches its SRF and should be avoided; switching frequencies much higher than one-third of SRF (i.e., >230 kHz) introduce uncontrolled impedance behavior that degrades converter stability and efficiency.
Can the PTHF500-894VM be used as a substitute for a different toroidal inductor in an existing design, and what compatibility checks are necessary?
Direct substitution of the PTHF500-894VM into a design originally using a different toroidal inductor requires verification of four key parameters: (1) inductance match (within ±10% tolerance for the PTHF500-894VM); (2) current rating adequacy (3.4 A continuous and 3.1 A saturation for the PTHF500-894VM); (3) DCR impact on efficiency (131 mOhm maximum for the PTHF500-894VM may differ significantly from the original); and (4) physical footprint compatibility (the PTHF500-894VM measures 36.83 mm × 20.95 mm with 37.46 mm seated height). If the original inductor had a lower DCR (e.g., 80 mOhm), substituting the PTHF500-894VM increases losses and temperature rise, potentially violating thermal budgets. If the original had a higher saturation current (e.g., 5 A), the PTHF500-894VM's 3.1 A saturation may be insufficient for transient loads. The PTHF500-894VM's MPP core also exhibits different frequency characteristics than ferrite or iron-powder alternatives; if the circuit relies on frequency-dependent impedance (e.g., in EMI filtering), substitution may alter performance. Best practice is to verify each parameter through simulation or bench testing before committing to production. Pin-for-pin compatibility alone is not sufficient; thermal, electrical, and frequency-domain behavior must all align with design margins.
What maintenance or monitoring practices are recommended for circuits using the PTHF500-894VM in harsh environmental conditions?
The PTHF500-894VM is RoHS non-compliant and REACH Unaffected, indicating it contains lead and uses materials outside some regulatory frameworks. In applications subject to environmental or regulatory scrutiny (e.g., consumer electronics, automotive in certain regions), use of the PTHF500-894VM may require compliance documentation or material disclosure. From a reliability perspective, the PTHF500-894VM's molybdenum permalloy core is stable across wide temperature ranges (-40°C to +125°C typical for toroidal inductors), but the epoxy encapsulation and solder connections are not. In humid or corrosive environments (e.g., marine, outdoor power conversion), the PTHF500-894VM should be conformally coated or enclosed in a potted module to prevent moisture ingress and solder joint degradation. Thermal cycling (e.g., ±50°C daily swings) can loosen mechanical connections over years; periodic vibration testing and resistance measurements of the PTHF500-894VM's leads help detect early failure. In high-vibration applications (e.g., vehicle-mounted supplies, industrial motor drives), the PTHF500-894VM's radial lead configuration should be supported with mechanical clamps or stress-relief loops to prevent lead fatigue and open-circuit failure. Temperature monitoring via a thermistor or infrared sensor placed near the PTHF500-894VM can flag thermal runaway or excessive losses before failure occurs. For mission-critical applications, redundant or parallel inductors (with current-sharing resistors) allow graceful degradation if the PTHF500-894VM fails.

Parts with Similar Specifications

The three parts on the right have similar specifications to API Delevan Inc. PTHF500-894VM

Product Attribute PTHF500R-894VM PTHF50-894VM PTHF500-894 PTHF500R-894H
Part Number PTHF500R-894VM PTHF50-894VM PTHF500-894 PTHF500R-894H
Manufacturer API Delevan Inc. API Delevan Inc. API Delevan Inc. API Delevan Inc.
Material - Core - - - -
Current - Saturation (Isat) - - - -
Height - Seated (Max) - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Inductance Frequency - Test - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Type - - - -
Tolerance - - - -
DC Resistance (DCR) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Current Rating (Amps) - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Size / Dimension - - - -
Frequency - Self Resonant - - - -
Ratings - - - -
Q @ Freq - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Inductance - - - -
Series - - - -
Shielding - - - -

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API Delevan Inc.

PTHF500-894VM

API Delevan Inc.
98D-PTHF500-894VM

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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